xref: /freebsd-11-stable/contrib/subversion/subversion/libsvn_wc/merge.c

/*
 * merge.c:  merging changes into a working file
 *
 * ====================================================================
 *    Licensed to the Apache Software Foundation (ASF) under one
 *    or more contributor license agreements.  See the NOTICE file
 *    distributed with this work for additional information
 *    regarding copyright ownership.  The ASF licenses this file
 *    to you under the Apache License, Version 2.0 (the
 *    "License"); you may not use this file except in compliance
 *    with the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing,
 *    software distributed under the License is distributed on an
 *    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *    KIND, either express or implied.  See the License for the
 *    specific language governing permissions and limitations
 *    under the License.
 * ====================================================================
 */

#include "svn_wc.h"
#include "svn_diff.h"
#include "svn_dirent_uri.h"
#include "svn_path.h"
#include "svn_pools.h"

#include "wc.h"
#include "adm_files.h"
#include "conflicts.h"
#include "translate.h"
#include "workqueue.h"

#include "private/svn_skel.h"

#include "svn_private_config.h"

/* Contains some information on the merge target before merge, and some
   information needed for the diff processing. */
typedef struct merge_target_t
{
  svn_wc__db_t *db;                         /* The DB used to access target */
  const char *local_abspath;                /* The absolute path to target */
  const char *wri_abspath;                  /* The working copy of target */

  apr_hash_t *old_actual_props;                 /* The set of actual properties
                                               before merging */
  const apr_array_header_t *prop_diff;      /* The property changes */

  const char *diff3_cmd;                    /* The diff3 command and options */
  const apr_array_header_t *merge_options;

} merge_target_t;


/* Return a pointer to the svn_prop_t structure from PROP_DIFF
   belonging to PROP_NAME, if any.  NULL otherwise.*/
static const svn_prop_t *
get_prop(const apr_array_header_t *prop_diff,
         const char *prop_name)
{
  if (prop_diff)
    {
      int i;
      for (i = 0; i < prop_diff->nelts; i++)
        {
          const svn_prop_t *elt = &APR_ARRAY_IDX(prop_diff, i,
                                                 svn_prop_t);

          if (strcmp(elt->name, prop_name) == 0)
            return elt;
        }
    }

  return NULL;
}


/* Detranslate a working copy file MERGE_TARGET to achieve the effect of:

   1. Detranslate
   2. Install new props
   3. Retranslate
   4. Detranslate

   in one pass, to get a file which can be compared with the left and right
   files which are in repository normal form.

   Property changes make this a little complex though. Changes in

   - svn:mime-type
   - svn:eol-style
   - svn:keywords
   - svn:special

   may change the way a file is translated.

   Effect for svn:mime-type:

     If svn:mime-type is considered 'binary', we ignore svn:eol-style (but
     still translate keywords).

     I) both old and new mime-types are texty
        -> just do the translation dance (as lined out below)
           ### actually we do a shortcut with just one translation:
           detranslate with the old keywords and ... eol-style
           (the new re+detranslation is a no-op w.r.t. keywords [1])

     II) the old one is texty, the new one is binary
        -> detranslate with the old eol-style and keywords
           (the new re+detranslation is a no-op [1])

     III) the old one is binary, the new one texty
        -> detranslate with the old keywords and new eol-style
           (the old detranslation is a no-op w.r.t. eol, and
            the new re+detranslation is a no-op w.r.t. keywords [1])

     IV) the old and new ones are binary
        -> detranslate with the old keywords
           (the new re+detranslation is a no-op [1])

   Effect for svn:eol-style

     I) On add or change of svn:eol-style, use the new value

     II) otherwise: use the old value (absent means 'no translation')

   Effect for svn:keywords

     Always use the old settings (re+detranslation are no-op [1]).

     [1] Translation of keywords from repository normal form to WC form and
         back is normally a no-op, but is not a no-op if text contains a kw
         that is only enabled by the new props and is present in non-
         contracted form (such as "$Rev: 1234 $").  If we want to catch this
         case we should detranslate with both the old & the new keywords
         together.

   Effect for svn:special

     Always use the old settings (re+detranslation are no-op).

  Sets *DETRANSLATED_ABSPATH to the path to the detranslated file,
  this may be the same as SOURCE_ABSPATH if FORCE_COPY is FALSE and no
  translation is required.

  If FORCE_COPY is FALSE and *DETRANSLATED_ABSPATH is a file distinct
  from SOURCE_ABSPATH then the file will be deleted on RESULT_POOL
  cleanup.

  If FORCE_COPY is TRUE then *DETRANSLATED_ABSPATH will always be a
  new file distinct from SOURCE_ABSPATH and it will be the callers
  responsibility to delete the file.

*/
static svn_error_t *
detranslate_wc_file(const char **detranslated_abspath,
                    const merge_target_t *mt,
                    svn_boolean_t force_copy,
                    const char *source_abspath,
                    svn_cancel_func_t cancel_func,
                    void *cancel_baton,
                    apr_pool_t *result_pool,
                    apr_pool_t *scratch_pool)
{
  svn_boolean_t old_is_binary, new_is_binary;
  svn_subst_eol_style_t style;
  const char *eol;
  apr_hash_t *keywords;
  svn_boolean_t special;

  {
    const char *old_mime_value
      = svn_prop_get_value(mt->old_actual_props, SVN_PROP_MIME_TYPE);
    const svn_prop_t *prop = get_prop(mt->prop_diff, SVN_PROP_MIME_TYPE);
    const char *new_mime_value
      = prop ? (prop->value ? prop->value->data : NULL) : old_mime_value;

    old_is_binary = old_mime_value && svn_mime_type_is_binary(old_mime_value);
    new_is_binary = new_mime_value && svn_mime_type_is_binary(new_mime_value);;
  }

  /* See what translations we want to do */
  if (old_is_binary && new_is_binary)
    {
      /* Case IV. Old and new props 'binary': detranslate keywords only */
      SVN_ERR(svn_wc__get_translate_info(NULL, NULL, &keywords, NULL,
                                         mt->db, mt->local_abspath,
                                         mt->old_actual_props, TRUE,
                                         scratch_pool, scratch_pool));
      /* ### Why override 'special'? Elsewhere it has precedence. */
      special = FALSE;
      eol = NULL;
      style = svn_subst_eol_style_none;
    }
  else if (!old_is_binary && new_is_binary)
    {
      /* Case II. Old props indicate texty, new props indicate binary:
         detranslate keywords and old eol-style */
      SVN_ERR(svn_wc__get_translate_info(&style, &eol,
                                         &keywords,
                                         &special,
                                         mt->db, mt->local_abspath,
                                         mt->old_actual_props, TRUE,
                                         scratch_pool, scratch_pool));
    }
  else
    {
      /* Case I & III. New props indicate texty, regardless of old props */

      /* In case the file used to be special, detranslate specially */
      SVN_ERR(svn_wc__get_translate_info(&style, &eol,
                                         &keywords,
                                         &special,
                                         mt->db, mt->local_abspath,
                                         mt->old_actual_props, TRUE,
                                         scratch_pool, scratch_pool));

      if (special)
        {
          keywords = NULL;
          eol = NULL;
          style = svn_subst_eol_style_none;
        }
      else
        {
          const svn_prop_t *prop;

          /* In case a new eol style was set, use that for detranslation */
          if ((prop = get_prop(mt->prop_diff, SVN_PROP_EOL_STYLE)) && prop->value)
            {
              /* Value added or changed */
              svn_subst_eol_style_from_value(&style, &eol, prop->value->data);
            }
          else if (!old_is_binary)
            {
              /* Already fetched */
            }
          else
            {
              eol = NULL;
              style = svn_subst_eol_style_none;
            }
        }
    }

  /* Now, detranslate with the settings we created above */

  if (force_copy || keywords || eol || special)
    {
      const char *temp_dir_abspath;
      const char *detranslated;

      /* Force a copy into the temporary wc area to avoid having
         temporary files created below to appear in the actual wc. */
      SVN_ERR(svn_wc__db_temp_wcroot_tempdir(&temp_dir_abspath, mt->db,
                                             mt->wri_abspath,
                                             scratch_pool, scratch_pool));

      /* ### svn_subst_copy_and_translate4() also creates a tempfile
         ### internally.  Anyway to piggyback on that? */
      SVN_ERR(svn_io_open_unique_file3(NULL, &detranslated, temp_dir_abspath,
                                       (force_copy
                                        ? svn_io_file_del_none
                                        : svn_io_file_del_on_pool_cleanup),
                                       result_pool, scratch_pool));

      /* Always 'repair' EOLs here, so that we can apply a diff that
         changes from inconsistent newlines and no 'svn:eol-style' to
         consistent newlines and 'svn:eol-style' set.  */

      if (style == svn_subst_eol_style_native)
        eol = SVN_SUBST_NATIVE_EOL_STR;
      else if (style != svn_subst_eol_style_fixed
               && style != svn_subst_eol_style_none)
        return svn_error_create(SVN_ERR_IO_UNKNOWN_EOL, NULL, NULL);

      SVN_ERR(svn_subst_copy_and_translate4(source_abspath,
                                            detranslated,
                                            eol,
                                            TRUE /* repair */,
                                            keywords,
                                            FALSE /* contract keywords */,
                                            special,
                                            cancel_func, cancel_baton,
                                            scratch_pool));

      SVN_ERR(svn_dirent_get_absolute(detranslated_abspath, detranslated,
                                      result_pool));
    }
  else
    *detranslated_abspath = apr_pstrdup(result_pool, source_abspath);

  return SVN_NO_ERROR;
}

/* Updates (by copying and translating) the eol style in
   OLD_TARGET_ABSPATH returning the filename containing the
   correct eol style in NEW_TARGET_ABSPATH, if an eol style
   change is contained in PROP_DIFF. */
static svn_error_t *
maybe_update_target_eols(const char **new_target_abspath,
                         const apr_array_header_t *prop_diff,
                         const char *old_target_abspath,
                         svn_cancel_func_t cancel_func,
                         void *cancel_baton,
                         apr_pool_t *result_pool,
                         apr_pool_t *scratch_pool)
{
  const svn_prop_t *prop = get_prop(prop_diff, SVN_PROP_EOL_STYLE);

  if (prop && prop->value)
    {
      const char *eol;
      const char *tmp_new;

      svn_subst_eol_style_from_value(NULL, &eol, prop->value->data);
      SVN_ERR(svn_io_open_unique_file3(NULL, &tmp_new, NULL,
                                       svn_io_file_del_on_pool_cleanup,
                                       result_pool, scratch_pool));

      /* Always 'repair' EOLs here, so that we can apply a diff that
         changes from inconsistent newlines and no 'svn:eol-style' to
         consistent newlines and 'svn:eol-style' set.  */
      SVN_ERR(svn_subst_copy_and_translate4(old_target_abspath,
                                            tmp_new,
                                            eol,
                                            TRUE /* repair */,
                                            NULL /* keywords */,
                                            FALSE /* expand */,
                                            FALSE /* special */,
                                            cancel_func, cancel_baton,
                                            scratch_pool));
      *new_target_abspath = apr_pstrdup(result_pool, tmp_new);
    }
  else
    *new_target_abspath = apr_pstrdup(result_pool, old_target_abspath);

  return SVN_NO_ERROR;
}


/* Set *TARGET_MARKER, *LEFT_MARKER and *RIGHT_MARKER to strings suitable
   for delimiting the alternative texts in a text conflict.  Include in each
   marker a string that may be given by TARGET_LABEL, LEFT_LABEL and
   RIGHT_LABEL respectively or a default value where any of those are NULL.

   Allocate the results in POOL or statically. */
static void
init_conflict_markers(const char **target_marker,
                      const char **left_marker,
                      const char **right_marker,
                      const char *target_label,
                      const char *left_label,
                      const char *right_label,
                      apr_pool_t *pool)
{
  /* Labels fall back to sensible defaults if not specified. */
  if (target_label)
    *target_marker = apr_psprintf(pool, "<<<<<<< %s", target_label);
  else
    *target_marker = "<<<<<<< .working";

  if (left_label)
    *left_marker = apr_psprintf(pool, "||||||| %s", left_label);
  else
    *left_marker = "||||||| .old";

  if (right_label)
    *right_marker = apr_psprintf(pool, ">>>>>>> %s", right_label);
  else
    *right_marker = ">>>>>>> .new";
}

/* Do a 3-way merge of the files at paths LEFT, DETRANSLATED_TARGET,
 * and RIGHT, using diff options provided in MERGE_OPTIONS.  Store the merge
 * result in the file RESULT_F.
 * If there are conflicts, set *CONTAINS_CONFLICTS to true, and use
 * TARGET_LABEL, LEFT_LABEL, and RIGHT_LABEL as labels for conflict
 * markers.  Else, set *CONTAINS_CONFLICTS to false.
 * Do all allocations in POOL. */
static svn_error_t *
do_text_merge(svn_boolean_t *contains_conflicts,
              apr_file_t *result_f,
              const apr_array_header_t *merge_options,
              const char *detranslated_target,
              const char *left,
              const char *right,
              const char *target_label,
              const char *left_label,
              const char *right_label,
              apr_pool_t *pool)
{
  svn_diff_t *diff;
  svn_stream_t *ostream;
  const char *target_marker;
  const char *left_marker;
  const char *right_marker;
  svn_diff_file_options_t *diff3_options;

  diff3_options = svn_diff_file_options_create(pool);

  if (merge_options)
    SVN_ERR(svn_diff_file_options_parse(diff3_options,
                                        merge_options, pool));


  init_conflict_markers(&target_marker, &left_marker, &right_marker,
                        target_label, left_label, right_label, pool);

  SVN_ERR(svn_diff_file_diff3_2(&diff, left, detranslated_target, right,
                                diff3_options, pool));

  ostream = svn_stream_from_aprfile2(result_f, TRUE, pool);

  SVN_ERR(svn_diff_file_output_merge2(ostream, diff,
                                      left, detranslated_target, right,
                                      left_marker,
                                      target_marker,
                                      right_marker,
                                      "=======", /* separator */
                                      svn_diff_conflict_display_modified_original_latest,
                                      pool));
  SVN_ERR(svn_stream_close(ostream));

  *contains_conflicts = svn_diff_contains_conflicts(diff);

  return SVN_NO_ERROR;
}

/* Same as do_text_merge() above, but use the external diff3
 * command DIFF3_CMD to perform the merge.  Pass MERGE_OPTIONS
 * to the diff3 command.  Do all allocations in POOL. */
static svn_error_t *
do_text_merge_external(svn_boolean_t *contains_conflicts,
                       apr_file_t *result_f,
                       const char *diff3_cmd,
                       const apr_array_header_t *merge_options,
                       const char *detranslated_target,
                       const char *left_abspath,
                       const char *right_abspath,
                       const char *target_label,
                       const char *left_label,
                       const char *right_label,
                       apr_pool_t *scratch_pool)
{
  int exit_code;

  SVN_ERR(svn_io_run_diff3_3(&exit_code, ".",
                             detranslated_target, left_abspath, right_abspath,
                             target_label, left_label, right_label,
                             result_f, diff3_cmd,
                             merge_options, scratch_pool));

  *contains_conflicts = exit_code == 1;

  return SVN_NO_ERROR;
}

/* Preserve the three pre-merge files.

   Create three empty files, with unique names that each include the
   basename of TARGET_ABSPATH and one of LEFT_LABEL, RIGHT_LABEL and
   TARGET_LABEL, in the directory that contains TARGET_ABSPATH.  Typical
   names are "foo.c.r37" or "foo.c.2.mine".  Set *LEFT_COPY, *RIGHT_COPY and
   *TARGET_COPY to their absolute paths.

   Set *WORK_ITEMS to a list of new work items that will write copies of
   LEFT_ABSPATH, RIGHT_ABSPATH and TARGET_ABSPATH into the three files,
   translated to working-copy form.

   The translation to working-copy form will be done according to the
   versioned properties of TARGET_ABSPATH that are current when the work
   queue items are executed.

   If target_abspath is not versioned use detranslated_target_abspath
   as the target file.
       ### NOT IMPLEMENTED -- 'detranslated_target_abspath' is not used.
*/
static svn_error_t *
preserve_pre_merge_files(svn_skel_t **work_items,
                         const char **left_copy,
                         const char **right_copy,
                         const char **target_copy,
                         const merge_target_t *mt,
                         const char *left_abspath,
                         const char *right_abspath,
                         const char *left_label,
                         const char *right_label,
                         const char *target_label,
                         const char *detranslated_target_abspath,
                         svn_cancel_func_t cancel_func,
                         void *cancel_baton,
                         apr_pool_t *result_pool,
                         apr_pool_t *scratch_pool)
{
  const char *tmp_left, *tmp_right, *detranslated_target_copy;
  const char *dir_abspath, *target_name;
  const char *wcroot_abspath, *temp_dir_abspath;
  svn_skel_t *work_item, *last_items = NULL;

  *work_items = NULL;

  svn_dirent_split(&dir_abspath, &target_name, mt->local_abspath,
                   scratch_pool);

  SVN_ERR(svn_wc__db_get_wcroot(&wcroot_abspath, mt->db, mt->wri_abspath,
                                scratch_pool, scratch_pool));
  SVN_ERR(svn_wc__db_temp_wcroot_tempdir(&temp_dir_abspath, mt->db,
                                         mt->wri_abspath,
                                         scratch_pool, scratch_pool));

  /* Create three empty files in DIR_ABSPATH, naming them with unique names
     that each include TARGET_NAME and one of {LEFT,RIGHT,TARGET}_LABEL,
     and set *{LEFT,RIGHT,TARGET}_COPY to those names. */
  SVN_ERR(svn_io_open_uniquely_named(
            NULL, left_copy, dir_abspath, target_name, left_label,
            svn_io_file_del_none, result_pool, scratch_pool));
  SVN_ERR(svn_io_open_uniquely_named(
            NULL, right_copy, dir_abspath, target_name, right_label,
            svn_io_file_del_none, result_pool, scratch_pool));
  SVN_ERR(svn_io_open_uniquely_named(
            NULL, target_copy, dir_abspath, target_name, target_label,
            svn_io_file_del_none, result_pool, scratch_pool));

  /* We preserve all the files with keywords expanded and line
     endings in local (working) form. */

  /* The workingqueue requires its paths to be in the subtree
     relative to the wcroot path they are executed in.

     Make our LEFT and RIGHT files 'local' if they aren't... */
  if (! svn_dirent_is_ancestor(wcroot_abspath, left_abspath))
    {
      SVN_ERR(svn_io_open_unique_file3(NULL, &tmp_left, temp_dir_abspath,
                                       svn_io_file_del_none,
                                       scratch_pool, scratch_pool));
      SVN_ERR(svn_io_copy_file(left_abspath, tmp_left, TRUE, scratch_pool));

      /* And create a wq item to remove the file later */
      SVN_ERR(svn_wc__wq_build_file_remove(&work_item, mt->db, wcroot_abspath,
                                           tmp_left,
                                           result_pool, scratch_pool));

      last_items = svn_wc__wq_merge(last_items, work_item, result_pool);
    }
  else
    tmp_left = left_abspath;

  if (! svn_dirent_is_ancestor(wcroot_abspath, right_abspath))
    {
      SVN_ERR(svn_io_open_unique_file3(NULL, &tmp_right, temp_dir_abspath,
                                       svn_io_file_del_none,
                                       scratch_pool, scratch_pool));
      SVN_ERR(svn_io_copy_file(right_abspath, tmp_right, TRUE, scratch_pool));

      /* And create a wq item to remove the file later */
      SVN_ERR(svn_wc__wq_build_file_remove(&work_item, mt->db, wcroot_abspath,
                                           tmp_right,
                                           result_pool, scratch_pool));

      last_items = svn_wc__wq_merge(last_items, work_item, result_pool);
    }
  else
    tmp_right = right_abspath;

  /* NOTE: Callers must ensure that the svn:eol-style and
     svn:keywords property values are correct in the currently
     installed props.  With 'svn merge', it's no big deal.  But
     when 'svn up' calls this routine, it needs to make sure that
     this routine is using the newest property values that may
     have been received *during* the update.  Since this routine
     will be run from within a log-command, merge_file()
     needs to make sure that a previous log-command to 'install
     latest props' has already executed first.  Ben and I just
     checked, and that is indeed the order in which the log items
     are written, so everything should be fine.  Really.  */

  /* Create LEFT and RIGHT backup files, in expanded form.
     We use TARGET_ABSPATH's current properties to do the translation. */
  /* Derive the basenames of the 3 backup files. */
  SVN_ERR(svn_wc__wq_build_file_copy_translated(&work_item,
                                                mt->db, mt->local_abspath,
                                                tmp_left, *left_copy,
                                                result_pool, scratch_pool));
  *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);

  SVN_ERR(svn_wc__wq_build_file_copy_translated(&work_item,
                                                mt->db, mt->local_abspath,
                                                tmp_right, *right_copy,
                                                result_pool, scratch_pool));
  *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);

  /* Back up TARGET_ABSPATH through detranslation/retranslation:
     the new translation properties may not match the current ones */
  SVN_ERR(detranslate_wc_file(&detranslated_target_copy, mt, TRUE,
                              mt->local_abspath,
                              cancel_func, cancel_baton,
                              scratch_pool, scratch_pool));

  SVN_ERR(svn_wc__wq_build_file_copy_translated(&work_item,
                                                mt->db, mt->local_abspath,
                                                detranslated_target_copy,
                                                *target_copy,
                                                result_pool, scratch_pool));
  *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);

  /* And maybe delete some tempfiles */
  SVN_ERR(svn_wc__wq_build_file_remove(&work_item, mt->db, wcroot_abspath,
                                       detranslated_target_copy,
                                       result_pool, scratch_pool));
  *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);

  *work_items = svn_wc__wq_merge(*work_items, last_items, result_pool);

  return SVN_NO_ERROR;
}

/* Attempt a trivial merge of LEFT_ABSPATH and RIGHT_ABSPATH to
 * the target file at TARGET_ABSPATH.
 *
 * These are the inherently trivial cases:
 *
 *   left == right == target         =>  no-op
 *   left != right, left == target   =>  target := right
 *
 * This case is also treated as trivial:
 *
 *   left != right, right == target  =>  no-op
 *
 *   ### Strictly, this case is a conflict, and the no-op outcome is only
 *       one of the possible resolutions.
 *
 *       TODO: Raise a conflict at this level and implement the 'no-op'
 *       resolution of that conflict at a higher level, in preparation for
 *       being able to support stricter conflict detection.
 *
 * This case is inherently trivial but not currently handled here:
 *
 *   left == right != target         =>  no-op
 *
 * The files at LEFT_ABSPATH and RIGHT_ABSPATH are in repository normal
 * form.  The file at DETRANSLATED_TARGET_ABSPATH is a copy of the target,
 * 'detranslated' to repository normal form, or may be the target file
 * itself if no translation is necessary.
 *
 * When this function updates the target file, it translates to working copy
 * form.
 *
 * On success, set *MERGE_OUTCOME to SVN_WC_MERGE_MERGED in case the
 * target was changed, or to SVN_WC_MERGE_UNCHANGED if the target was not
 * changed. Install work queue items allocated in RESULT_POOL in *WORK_ITEMS.
 * On failure, set *MERGE_OUTCOME to SVN_WC_MERGE_NO_MERGE.
 */
static svn_error_t *
merge_file_trivial(svn_skel_t **work_items,
                   enum svn_wc_merge_outcome_t *merge_outcome,
                   const char *left_abspath,
                   const char *right_abspath,
                   const char *target_abspath,
                   const char *detranslated_target_abspath,
                   svn_boolean_t dry_run,
                   svn_wc__db_t *db,
                   svn_cancel_func_t cancel_func,
                   void *cancel_baton,
                   apr_pool_t *result_pool,
                   apr_pool_t *scratch_pool)
{
  svn_skel_t *work_item;
  svn_boolean_t same_left_right;
  svn_boolean_t same_right_target;
  svn_boolean_t same_left_target;
  svn_node_kind_t kind;
  svn_boolean_t is_special;

  /* If the target is not a normal file, do not attempt a trivial merge. */
  SVN_ERR(svn_io_check_special_path(target_abspath, &kind, &is_special,
                                    scratch_pool));
  if (kind != svn_node_file || is_special)
    {
      *merge_outcome = svn_wc_merge_no_merge;
      return SVN_NO_ERROR;
    }

  /* Check the files */
  SVN_ERR(svn_io_files_contents_three_same_p(&same_left_right,
                                             &same_right_target,
                                             &same_left_target,
                                             left_abspath,
                                             right_abspath,
                                             detranslated_target_abspath,
                                             scratch_pool));

  /* If the LEFT side of the merge is equal to WORKING, then we can
   * copy RIGHT directly. */
  if (same_left_target)
    {
      /* If the left side equals the right side, there is no change to merge
       * so we leave the target unchanged. */
      if (same_left_right)
        {
          *merge_outcome = svn_wc_merge_unchanged;
        }
      else
        {
          *merge_outcome = svn_wc_merge_merged;
          if (!dry_run)
            {
              const char *wcroot_abspath;
              svn_boolean_t delete_src = FALSE;

              /* The right_abspath might be outside our working copy. In that
                 case we should copy the file to a safe location before
                 installing to avoid breaking the workqueue.

                 This matches the behavior in preserve_pre_merge_files */

              SVN_ERR(svn_wc__db_get_wcroot(&wcroot_abspath,
                                            db, target_abspath,
                                            scratch_pool, scratch_pool));

              if (!svn_dirent_is_child(wcroot_abspath, right_abspath, NULL))
                {
                  svn_stream_t *tmp_src;
                  svn_stream_t *tmp_dst;

                  SVN_ERR(svn_stream_open_readonly(&tmp_src, right_abspath,
                                                   scratch_pool,
                                                   scratch_pool));

                  SVN_ERR(svn_wc__open_writable_base(&tmp_dst, &right_abspath,
                                                     NULL, NULL,
                                                     db, target_abspath,
                                                     scratch_pool,
                                                     scratch_pool));

                  SVN_ERR(svn_stream_copy3(tmp_src, tmp_dst,
                                           cancel_func, cancel_baton,
                                           scratch_pool));

                  delete_src = TRUE;
                }

              SVN_ERR(svn_wc__wq_build_file_install(
                        &work_item, db, target_abspath, right_abspath,
                        FALSE /* use_commit_times */,
                        FALSE /* record_fileinfo */,
                        result_pool, scratch_pool));
              *work_items = svn_wc__wq_merge(*work_items, work_item,
                                             result_pool);

              if (delete_src)
                {
                  SVN_ERR(svn_wc__wq_build_file_remove(
                                    &work_item, db, wcroot_abspath,
                                    right_abspath,
                                    result_pool, scratch_pool));
                  *work_items = svn_wc__wq_merge(*work_items, work_item,
                                                 result_pool);
                }
            }
        }

      return SVN_NO_ERROR;
    }
  else
    {
      /* If the locally existing, changed file equals the incoming 'right'
       * file, there is no conflict.  For binary files, we historically
       * conflicted them needlessly, while merge_text_file figured it out
       * eventually and returned svn_wc_merge_unchanged for them, which
       * is what we do here. */
      if (same_right_target)
        {
          *merge_outcome = svn_wc_merge_unchanged;
          return SVN_NO_ERROR;
        }
    }

  *merge_outcome = svn_wc_merge_no_merge;
  return SVN_NO_ERROR;
}


/* Handle a non-trivial merge of 'text' files.  (Assume that a trivial
 * merge was not possible.)
 *
 * Set *WORK_ITEMS, *CONFLICT_SKEL and *MERGE_OUTCOME according to the
 * result -- to install the merged file, or to indicate a conflict.
 *
 * On successful merge, leave the result in a temporary file and set
 * *WORK_ITEMS to hold work items that will translate and install that
 * file into its proper form and place (unless DRY_RUN) and delete the
 * temporary file (in any case).  Set *MERGE_OUTCOME to 'merged' or
 * 'unchanged'.
 *
 * If a conflict occurs, set *MERGE_OUTCOME to 'conflicted', and (unless
 * DRY_RUN) set *WORK_ITEMS and *CONFLICT_SKEL to record the conflict
 * and copies of the pre-merge files.  See preserve_pre_merge_files()
 * for details.
 *
 * On entry, all of the output pointers must be non-null and *CONFLICT_SKEL
 * must either point to an existing conflict skel or be NULL.
 */
static svn_error_t*
merge_text_file(svn_skel_t **work_items,
                svn_skel_t **conflict_skel,
                enum svn_wc_merge_outcome_t *merge_outcome,
                const merge_target_t *mt,
                const char *left_abspath,
                const char *right_abspath,
                const char *left_label,
                const char *right_label,
                const char *target_label,
                svn_boolean_t dry_run,
                const char *detranslated_target_abspath,
                svn_cancel_func_t cancel_func,
                void *cancel_baton,
                apr_pool_t *result_pool,
                apr_pool_t *scratch_pool)
{
  apr_pool_t *pool = scratch_pool;  /* ### temporary rename  */
  svn_boolean_t contains_conflicts;
  apr_file_t *result_f;
  const char *result_target;
  const char *base_name;
  const char *temp_dir;
  svn_skel_t *work_item;

  *work_items = NULL;

  base_name = svn_dirent_basename(mt->local_abspath, scratch_pool);

  /* Open a second temporary file for writing; this is where diff3
     will write the merged results.  We want to use a tempfile
     with a name that reflects the original, in case this
     ultimately winds up in a conflict resolution editor.  */
  SVN_ERR(svn_wc__db_temp_wcroot_tempdir(&temp_dir, mt->db, mt->wri_abspath,
                                         pool, pool));
  SVN_ERR(svn_io_open_uniquely_named(&result_f, &result_target,
                                     temp_dir, base_name, ".tmp",
                                     svn_io_file_del_none, pool, pool));

  /* Run the external or internal merge, as requested. */
  if (mt->diff3_cmd)
      SVN_ERR(do_text_merge_external(&contains_conflicts,
                                     result_f,
                                     mt->diff3_cmd,
                                     mt->merge_options,
                                     detranslated_target_abspath,
                                     left_abspath,
                                     right_abspath,
                                     target_label,
                                     left_label,
                                     right_label,
                                     pool));
  else /* Use internal merge. */
    SVN_ERR(do_text_merge(&contains_conflicts,
                          result_f,
                          mt->merge_options,
                          detranslated_target_abspath,
                          left_abspath,
                          right_abspath,
                          target_label,
                          left_label,
                          right_label,
                          pool));

  SVN_ERR(svn_io_file_close(result_f, pool));

  /* Determine the MERGE_OUTCOME, and record any conflict. */
  if (contains_conflicts && ! dry_run)
    {
      *merge_outcome = svn_wc_merge_conflict;
      if (*merge_outcome == svn_wc_merge_conflict)
        {
          const char *left_copy, *right_copy, *target_copy;

          /* Preserve the three conflict files */
          SVN_ERR(preserve_pre_merge_files(
                    &work_item,
                    &left_copy, &right_copy, &target_copy,
                    mt, left_abspath, right_abspath,
                    left_label, right_label, target_label,
                    detranslated_target_abspath,
                    cancel_func, cancel_baton,
                    result_pool, scratch_pool));
          *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);

          /* Track the conflict marker files in the metadata. */

          if (!*conflict_skel)
            *conflict_skel = svn_wc__conflict_skel_create(result_pool);

          SVN_ERR(svn_wc__conflict_skel_add_text_conflict(*conflict_skel,
                                                          mt->db, mt->local_abspath,
                                                          target_copy,
                                                          left_copy,
                                                          right_copy,
                                                          result_pool,
                                                          scratch_pool));
        }

      if (*merge_outcome == svn_wc_merge_merged)
        goto done;
    }
  else if (contains_conflicts && dry_run)
      *merge_outcome = svn_wc_merge_conflict;
  else
    {
      svn_boolean_t same, special;

      /* If 'special', then use the detranslated form of the
         target file.  This is so we don't try to follow symlinks,
         but the same treatment is probably also appropriate for
         whatever special file types we may invent in the future. */
      SVN_ERR(svn_wc__get_translate_info(NULL, NULL, NULL,
                                         &special, mt->db, mt->local_abspath,
                                         mt->old_actual_props, TRUE,
                                         pool, pool));
      SVN_ERR(svn_io_files_contents_same_p(&same, result_target,
                                           (special ?
                                              detranslated_target_abspath :
                                              mt->local_abspath),
                                           pool));

      *merge_outcome = same ? svn_wc_merge_unchanged : svn_wc_merge_merged;
    }

  if (*merge_outcome != svn_wc_merge_unchanged && ! dry_run)
    {
      /* replace TARGET_ABSPATH with the new merged file, expanding. */
      SVN_ERR(svn_wc__wq_build_file_install(&work_item,
                                            mt->db, mt->local_abspath,
                                            result_target,
                                            FALSE /* use_commit_times */,
                                            FALSE /* record_fileinfo */,
                                            result_pool, scratch_pool));
      *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);
    }

done:
  /* Remove the tempfile after use */
  SVN_ERR(svn_wc__wq_build_file_remove(&work_item, mt->db, mt->local_abspath,
                                       result_target,
                                       result_pool, scratch_pool));

  *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);

  return SVN_NO_ERROR;
}

/* Handle a non-trivial merge of 'binary' files: don't actually merge, just
 * flag a conflict.  (Assume that a trivial merge was not possible.)
 *
 * Copy* the files at LEFT_ABSPATH and RIGHT_ABSPATH into the same directory
 * as the target file, giving them unique names that start with the target
 * file's name and end with LEFT_LABEL and RIGHT_LABEL respectively.
 * If the merge target has been 'detranslated' to repository normal form,
 * move the detranslated file similarly to a unique name ending with
 * TARGET_LABEL.
 *
 * ### * Why do we copy the left and right temp files when we could (maybe
 *     not always?) move them?
 *
 * On entry, all of the output pointers must be non-null and *CONFLICT_SKEL
 * must either point to an existing conflict skel or be NULL.
 *
 * Set *WORK_ITEMS, *CONFLICT_SKEL and *MERGE_OUTCOME to indicate the
 * conflict.
 *
 * ### Why do we not use preserve_pre_merge_files() in here?  The
 *     behaviour would be slightly different, more consistent: the
 *     preserved 'left' and 'right' files would be translated to working
 *     copy form, which may make a difference when a binary file
 *     contains keyword expansions or when some versions of the file are
 *     not 'binary' even though we're merging in 'binary files' mode.
 */
static svn_error_t *
merge_binary_file(svn_skel_t **work_items,
                  svn_skel_t **conflict_skel,
                  enum svn_wc_merge_outcome_t *merge_outcome,
                  const merge_target_t *mt,
                  const char *left_abspath,
                  const char *right_abspath,
                  const char *left_label,
                  const char *right_label,
                  const char *target_label,
                  svn_boolean_t dry_run,
                  const char *detranslated_target_abspath,
                  apr_pool_t *result_pool,
                  apr_pool_t *scratch_pool)
{
  apr_pool_t *pool = scratch_pool;  /* ### temporary rename  */
  /* ### when making the binary-file backups, should we be honoring
     keywords and eol stuff?   */
  const char *left_copy, *right_copy;
  const char *merge_dirpath, *merge_filename;
  const char *conflict_wrk;

  *work_items = NULL;

  svn_dirent_split(&merge_dirpath, &merge_filename, mt->local_abspath, pool);

  if (dry_run)
    {
      *merge_outcome = svn_wc_merge_conflict;
      return SVN_NO_ERROR;
    }

  /* reserve names for backups of left and right fulltexts */
  SVN_ERR(svn_io_open_uniquely_named(NULL,
                                     &left_copy,
                                     merge_dirpath,
                                     merge_filename,
                                     left_label,
                                     svn_io_file_del_none,
                                     pool, pool));

  SVN_ERR(svn_io_open_uniquely_named(NULL,
                                     &right_copy,
                                     merge_dirpath,
                                     merge_filename,
                                     right_label,
                                     svn_io_file_del_none,
                                     pool, pool));

  /* create the backup files */
  SVN_ERR(svn_io_copy_file(left_abspath, left_copy, TRUE, pool));
  SVN_ERR(svn_io_copy_file(right_abspath, right_copy, TRUE, pool));

  /* Was the merge target detranslated? */
  if (strcmp(mt->local_abspath, detranslated_target_abspath) != 0)
    {
      /* Create a .mine file too */
      SVN_ERR(svn_io_open_uniquely_named(NULL,
                                         &conflict_wrk,
                                         merge_dirpath,
                                         merge_filename,
                                         target_label,
                                         svn_io_file_del_none,
                                         pool, pool));
      SVN_ERR(svn_wc__wq_build_file_move(work_items, mt->db,
                                         mt->local_abspath,
                                         detranslated_target_abspath,
                                         conflict_wrk,
                                         pool, result_pool));
    }
  else
    {
      conflict_wrk = NULL;
    }

  /* Mark target_abspath's entry as "Conflicted", and start tracking
     the backup files in the entry as well. */
  if (!*conflict_skel)
    *conflict_skel = svn_wc__conflict_skel_create(result_pool);

  SVN_ERR(svn_wc__conflict_skel_add_text_conflict(*conflict_skel,
                                                  mt->db, mt->local_abspath,
                                                  conflict_wrk,
                                                  left_copy,
                                                  right_copy,
                                                  result_pool, scratch_pool));

  *merge_outcome = svn_wc_merge_conflict; /* a conflict happened */

  return SVN_NO_ERROR;
}

svn_error_t *
svn_wc__internal_merge(svn_skel_t **work_items,
                       svn_skel_t **conflict_skel,
                       enum svn_wc_merge_outcome_t *merge_outcome,
                       svn_wc__db_t *db,
                       const char *left_abspath,
                       const char *right_abspath,
                       const char *target_abspath,
                       const char *wri_abspath,
                       const char *left_label,
                       const char *right_label,
                       const char *target_label,
                       apr_hash_t *old_actual_props,
                       svn_boolean_t dry_run,
                       const char *diff3_cmd,
                       const apr_array_header_t *merge_options,
                       const apr_array_header_t *prop_diff,
                       svn_cancel_func_t cancel_func,
                       void *cancel_baton,
                       apr_pool_t *result_pool,
                       apr_pool_t *scratch_pool)
{
  const char *detranslated_target_abspath;
  svn_boolean_t is_binary = FALSE;
  const svn_prop_t *mimeprop;
  svn_skel_t *work_item;
  merge_target_t mt;

  SVN_ERR_ASSERT(svn_dirent_is_absolute(left_abspath));
  SVN_ERR_ASSERT(svn_dirent_is_absolute(right_abspath));
  SVN_ERR_ASSERT(svn_dirent_is_absolute(target_abspath));

  *work_items = NULL;

  /* Fill the merge target baton */
  mt.db = db;
  mt.local_abspath = target_abspath;
  mt.wri_abspath = wri_abspath;
  mt.old_actual_props = old_actual_props;
  mt.prop_diff = prop_diff;
  mt.diff3_cmd = diff3_cmd;
  mt.merge_options = merge_options;

  /* Decide if the merge target is a text or binary file. */
  if ((mimeprop = get_prop(prop_diff, SVN_PROP_MIME_TYPE))
      && mimeprop->value)
    is_binary = svn_mime_type_is_binary(mimeprop->value->data);
  else
    {
      const char *value = svn_prop_get_value(mt.old_actual_props,
                                             SVN_PROP_MIME_TYPE);

      is_binary = value && svn_mime_type_is_binary(value);
    }

  SVN_ERR(detranslate_wc_file(&detranslated_target_abspath, &mt,
                              (! is_binary) && diff3_cmd != NULL,
                              target_abspath,
                              cancel_func, cancel_baton,
                              scratch_pool, scratch_pool));

  /* We cannot depend on the left file to contain the same eols as the
     right file. If the merge target has mods, this will mark the entire
     file as conflicted, so we need to compensate. */
  SVN_ERR(maybe_update_target_eols(&left_abspath, prop_diff, left_abspath,
                                   cancel_func, cancel_baton,
                                   scratch_pool, scratch_pool));

  SVN_ERR(merge_file_trivial(work_items, merge_outcome,
                             left_abspath, right_abspath,
                             target_abspath, detranslated_target_abspath,
                             dry_run, db, cancel_func, cancel_baton,
                             result_pool, scratch_pool));
  if (*merge_outcome == svn_wc_merge_no_merge)
    {
      /* We have a non-trivial merge.  If we classify it as a merge of
       * 'binary' files we'll just raise a conflict, otherwise we'll do
       * the actual merge of 'text' file contents. */
      if (is_binary)
        {
          /* Raise a text conflict */
          SVN_ERR(merge_binary_file(work_items,
                                    conflict_skel,
                                    merge_outcome,
                                    &mt,
                                    left_abspath,
                                    right_abspath,
                                    left_label,
                                    right_label,
                                    target_label,
                                    dry_run,
                                    detranslated_target_abspath,
                                    result_pool, scratch_pool));
        }
      else
        {
          SVN_ERR(merge_text_file(work_items,
                                  conflict_skel,
                                  merge_outcome,
                                  &mt,
                                  left_abspath,
                                  right_abspath,
                                  left_label,
                                  right_label,
                                  target_label,
                                  dry_run,
                                  detranslated_target_abspath,
                                  cancel_func, cancel_baton,
                                  result_pool, scratch_pool));
        }
    }

  /* Merging is complete.  Regardless of text or binariness, we might
     need to tweak the executable bit on the new working file, and
     possibly make it read-only. */
  if (! dry_run)
    {
      SVN_ERR(svn_wc__wq_build_sync_file_flags(&work_item, db,
                                               target_abspath,
                                               result_pool, scratch_pool));
      *work_items = svn_wc__wq_merge(*work_items, work_item, result_pool);
    }

  return SVN_NO_ERROR;
}


svn_error_t *
svn_wc_merge5(enum svn_wc_merge_outcome_t *merge_content_outcome,
              enum svn_wc_notify_state_t *merge_props_outcome,
              svn_wc_context_t *wc_ctx,
              const char *left_abspath,
              const char *right_abspath,
              const char *target_abspath,
              const char *left_label,
              const char *right_label,
              const char *target_label,
              const svn_wc_conflict_version_t *left_version,
              const svn_wc_conflict_version_t *right_version,
              svn_boolean_t dry_run,
              const char *diff3_cmd,
              const apr_array_header_t *merge_options,
              apr_hash_t *original_props,
              const apr_array_header_t *prop_diff,
              svn_wc_conflict_resolver_func2_t conflict_func,
              void *conflict_baton,
              svn_cancel_func_t cancel_func,
              void *cancel_baton,
              apr_pool_t *scratch_pool)
{
  const char *dir_abspath = svn_dirent_dirname(target_abspath, scratch_pool);
  svn_skel_t *work_items;
  svn_skel_t *conflict_skel = NULL;
  apr_hash_t *pristine_props = NULL;
  apr_hash_t *old_actual_props;
  apr_hash_t *new_actual_props = NULL;

  SVN_ERR_ASSERT(svn_dirent_is_absolute(left_abspath));
  SVN_ERR_ASSERT(svn_dirent_is_absolute(right_abspath));
  SVN_ERR_ASSERT(svn_dirent_is_absolute(target_abspath));

  /* Before we do any work, make sure we hold a write lock.  */
  if (!dry_run)
    SVN_ERR(svn_wc__write_check(wc_ctx->db, dir_abspath, scratch_pool));

  /* Sanity check:  the merge target must be a file under revision control */
  {
    svn_wc__db_status_t status;
    svn_node_kind_t kind;
    svn_boolean_t had_props;
    svn_boolean_t props_mod;
    svn_boolean_t conflicted;

    SVN_ERR(svn_wc__db_read_info(&status, &kind, NULL, NULL, NULL, NULL, NULL,
                                 NULL, NULL, NULL, NULL, NULL, NULL, NULL,
                                 NULL, NULL, NULL, NULL, NULL, NULL,
                                 &conflicted, NULL, &had_props, &props_mod,
                                 NULL, NULL, NULL,
                                 wc_ctx->db, target_abspath,
                                 scratch_pool, scratch_pool));

    if (kind != svn_node_file || (status != svn_wc__db_status_normal
                                  && status != svn_wc__db_status_added))
      {
        *merge_content_outcome = svn_wc_merge_no_merge;
        if (merge_props_outcome)
          *merge_props_outcome = svn_wc_notify_state_unchanged;
        return SVN_NO_ERROR;
      }

    if (conflicted)
      {
        svn_boolean_t text_conflicted;
        svn_boolean_t prop_conflicted;
        svn_boolean_t tree_conflicted;

        SVN_ERR(svn_wc__internal_conflicted_p(&text_conflicted,
                                              &prop_conflicted,
                                              &tree_conflicted,
                                              wc_ctx->db, target_abspath,
                                              scratch_pool));

        /* We can't install two prop conflicts on a single node, so
           avoid even checking that we have to merge it */
        if (text_conflicted || prop_conflicted || tree_conflicted)
          {
            return svn_error_createf(
                            SVN_ERR_WC_PATH_UNEXPECTED_STATUS, NULL,
                            _("Can't merge into conflicted node '%s'"),
                            svn_dirent_local_style(target_abspath,
                                                   scratch_pool));
          }
        /* else: Conflict was resolved by removing markers */
      }

    if (merge_props_outcome && had_props)
      {
        SVN_ERR(svn_wc__db_read_pristine_props(&pristine_props,
                                               wc_ctx->db, target_abspath,
                                               scratch_pool, scratch_pool));
      }
    else if (merge_props_outcome)
      pristine_props = apr_hash_make(scratch_pool);

    if (props_mod)
      {
        SVN_ERR(svn_wc__db_read_props(&old_actual_props,
                                      wc_ctx->db, target_abspath,
                                      scratch_pool, scratch_pool));
      }
    else if (pristine_props)
      old_actual_props = pristine_props;
    else
      old_actual_props = apr_hash_make(scratch_pool);
  }

  /* Merge the properties, if requested.  We merge the properties first
   * because the properties can affect the text (EOL style, keywords). */
  if (merge_props_outcome)
    {
      int i;

      /* The PROPCHANGES may not have non-"normal" properties in it. If entry
         or wc props were allowed, then the following code would install them
         into the BASE and/or WORKING properties(!).  */
      for (i = prop_diff->nelts; i--; )
        {
          const svn_prop_t *change = &APR_ARRAY_IDX(prop_diff, i, svn_prop_t);

          if (!svn_wc_is_normal_prop(change->name))
            return svn_error_createf(SVN_ERR_BAD_PROP_KIND, NULL,
                                     _("The property '%s' may not be merged "
                                       "into '%s'."),
                                     change->name,
                                     svn_dirent_local_style(target_abspath,
                                                            scratch_pool));
        }

      SVN_ERR(svn_wc__merge_props(&conflict_skel,
                                  merge_props_outcome,
                                  &new_actual_props,
                                  wc_ctx->db, target_abspath,
                                  original_props, pristine_props, old_actual_props,
                                  prop_diff,
                                  scratch_pool, scratch_pool));
    }

  /* Merge the text. */
  SVN_ERR(svn_wc__internal_merge(&work_items,
                                 &conflict_skel,
                                 merge_content_outcome,
                                 wc_ctx->db,
                                 left_abspath,
                                 right_abspath,
                                 target_abspath,
                                 target_abspath,
                                 left_label, right_label, target_label,
                                 old_actual_props,
                                 dry_run,
                                 diff3_cmd,
                                 merge_options,
                                 prop_diff,
                                 cancel_func, cancel_baton,
                                 scratch_pool, scratch_pool));

  /* If this isn't a dry run, then update the DB, run the work, and
   * call the conflict resolver callback.  */
  if (!dry_run)
    {
      if (conflict_skel)
        {
          svn_skel_t *work_item;

          SVN_ERR(svn_wc__conflict_skel_set_op_merge(conflict_skel,
                                                     left_version,
                                                     right_version,
                                                     scratch_pool,
                                                     scratch_pool));

          SVN_ERR(svn_wc__conflict_create_markers(&work_item,
                                                  wc_ctx->db, target_abspath,
                                                  conflict_skel,
                                                  scratch_pool, scratch_pool));

          work_items = svn_wc__wq_merge(work_items, work_item, scratch_pool);
        }

      if (new_actual_props)
        SVN_ERR(svn_wc__db_op_set_props(wc_ctx->db, target_abspath,
                                        new_actual_props,
                                        svn_wc__has_magic_property(prop_diff),
                                        conflict_skel, work_items,
                                        scratch_pool));
      else if (conflict_skel)
        SVN_ERR(svn_wc__db_op_mark_conflict(wc_ctx->db, target_abspath,
                                            conflict_skel, work_items,
                                            scratch_pool));
      else if (work_items)
        SVN_ERR(svn_wc__db_wq_add(wc_ctx->db, target_abspath, work_items,
                                  scratch_pool));

      if (work_items)
        SVN_ERR(svn_wc__wq_run(wc_ctx->db, target_abspath,
                               cancel_func, cancel_baton,
                               scratch_pool));

      if (conflict_skel && conflict_func)
        {
          svn_boolean_t text_conflicted, prop_conflicted;

          SVN_ERR(svn_wc__conflict_invoke_resolver(
                    wc_ctx->db, target_abspath,
                    conflict_skel, merge_options,
                    conflict_func, conflict_baton,
                    cancel_func, cancel_baton,
                    scratch_pool));

          /* Reset *MERGE_CONTENT_OUTCOME etc. if a conflict was resolved. */
          SVN_ERR(svn_wc__internal_conflicted_p(
                    &text_conflicted, &prop_conflicted, NULL,
                    wc_ctx->db, target_abspath, scratch_pool));
          if (*merge_props_outcome == svn_wc_notify_state_conflicted
              && ! prop_conflicted)
            *merge_props_outcome = svn_wc_notify_state_merged;
          if (*merge_content_outcome == svn_wc_merge_conflict
              && ! text_conflicted)
            *merge_content_outcome = svn_wc_merge_merged;
        }
    }

  return SVN_NO_ERROR;
}