1/*	$OpenBSD: repository.c,v 1.26 2019/06/28 13:35:00 deraadt Exp $	*/
2/*
3 * Copyright (c) 2006 Joris Vink <joris@openbsd.org>
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18#include <sys/stat.h>
19
20#include <errno.h>
21#include <fcntl.h>
22#include <pwd.h>
23#include <string.h>
24#include <unistd.h>
25
26#include "cvs.h"
27
28struct wklhead repo_locks;
29
30void
31cvs_repository_unlock(const char *repo)
32{
33	char fpath[PATH_MAX];
34
35	cvs_log(LP_TRACE, "cvs_repository_unlock(%s)", repo);
36
37	(void)xsnprintf(fpath, sizeof(fpath), "%s/%s", repo, CVS_LOCK);
38
39	if (unlink(fpath) == -1 && errno != ENOENT)
40		cvs_log(LP_ERR, "warning: failed to unlink %s", fpath);
41}
42
43void
44cvs_repository_lock(const char *repo, int wantlock)
45{
46	int i;
47	uid_t myuid;
48	struct stat st;
49	char fpath[PATH_MAX];
50	struct passwd *pw;
51
52	if (cvs_noexec == 1 || cvs_readonlyfs == 1)
53		return;
54
55	cvs_log(LP_TRACE, "cvs_repository_lock(%s, %d)", repo, wantlock);
56
57	(void)xsnprintf(fpath, sizeof(fpath), "%s/%s", repo, CVS_LOCK);
58
59	myuid = getuid();
60
61	for (i = 0; i < CVS_LOCK_TRIES; i++) {
62		if (cvs_quit)
63			fatal("received signal %d", sig_received);
64
65		if (stat(fpath, &st) == -1)
66			break;
67
68		if (st.st_uid == myuid)
69			return;
70
71		if ((pw = getpwuid(st.st_uid)) == NULL)
72			fatal("cvs_repository_lock: %s", strerror(errno));
73
74		cvs_log(LP_NOTICE, "waiting for %s's lock in '%s'",
75		    pw->pw_name, repo);
76		sleep(CVS_LOCK_SLEEP);
77	}
78
79	if (i == CVS_LOCK_TRIES)
80		fatal("maximum wait time for lock inside '%s' reached", repo);
81
82	if (wantlock == 0)
83		return;
84
85	if ((i = open(fpath, O_WRONLY|O_CREAT|O_TRUNC, 0755)) == -1) {
86		if (errno == EEXIST)
87			fatal("cvs_repository_lock: somebody beat us");
88		else
89			fatal("cvs_repository_lock: %s: %s",
90			    fpath, strerror(errno));
91	}
92
93	(void)close(i);
94	worklist_add(fpath, &repo_locks);
95}
96
97void
98cvs_repository_getdir(const char *dir, const char *wdir,
99	struct cvs_flisthead *fl, struct cvs_flisthead *dl, int flags)
100{
101	int type;
102	DIR *dirp;
103	struct stat st;
104	struct dirent *dp;
105	char *s, fpath[PATH_MAX], rpath[PATH_MAX];
106
107	if ((dirp = opendir(dir)) == NULL)
108		fatal("cvs_repository_getdir: failed to open '%s'", dir);
109
110	while ((dp = readdir(dirp)) != NULL) {
111		if (!strcmp(dp->d_name, ".") ||
112		    !strcmp(dp->d_name, "..") ||
113		    !strcmp(dp->d_name, CVS_LOCK))
114			continue;
115
116		(void)xsnprintf(fpath, PATH_MAX, "%s/%s", wdir, dp->d_name);
117		(void)xsnprintf(rpath, PATH_MAX, "%s/%s", dir, dp->d_name);
118
119		if (!TAILQ_EMPTY(&checkout_ign_pats)) {
120			if ((s = strrchr(fpath, ',')) != NULL)
121				*s = '\0';
122			if (cvs_file_chkign(fpath))
123				continue;
124			if (s != NULL)
125				*s = ',';
126		}
127
128		/*
129		 * nfs and afs will show d_type as DT_UNKNOWN
130		 * for files and/or directories so when we encounter
131		 * this we call lstat() on the path to be sure.
132		 */
133		if (dp->d_type == DT_UNKNOWN) {
134			if (lstat(rpath, &st) == -1)
135				fatal("'%s': %s", rpath, strerror(errno));
136
137			switch (st.st_mode & S_IFMT) {
138			case S_IFDIR:
139				type = CVS_DIR;
140				break;
141			case S_IFREG:
142				type = CVS_FILE;
143				break;
144			default:
145				fatal("Unknown file type in repository");
146			}
147		} else {
148			switch (dp->d_type) {
149			case DT_DIR:
150				type = CVS_DIR;
151				break;
152			case DT_REG:
153				type = CVS_FILE;
154				break;
155			default:
156				fatal("Unknown file type in repository");
157			}
158		}
159
160		if (!(flags & REPOSITORY_DODIRS) && type == CVS_DIR) {
161			if (strcmp(dp->d_name, CVS_PATH_ATTIC))
162				continue;
163		}
164
165		switch (type) {
166		case CVS_DIR:
167			if (!strcmp(dp->d_name, CVS_PATH_ATTIC)) {
168				cvs_repository_getdir(rpath, wdir, fl, dl,
169				    REPOSITORY_IS_ATTIC);
170			} else {
171				cvs_file_get(fpath, 0, dl, CVS_DIR);
172			}
173			break;
174		case CVS_FILE:
175			if ((s = strrchr(fpath, ',')) != NULL &&
176			    s != fpath && !strcmp(s, RCS_FILE_EXT)) {
177				*s = '\0';
178				cvs_file_get(fpath,
179				    (flags & REPOSITORY_IS_ATTIC) ?
180				    FILE_INSIDE_ATTIC : 0, fl, CVS_FILE);
181			}
182			break;
183		default:
184			fatal("type %d unknown, shouldn't happen", type);
185		}
186	}
187
188	(void)closedir(dirp);
189}
190