utilities.c revision 23685 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static char sccsid[] = "@(#)utilities.c	8.5 (Berkeley) 4/28/95";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/stat.h>
40
41#include <ufs/ufs/dinode.h>
42#include <ufs/ufs/dir.h>
43
44#include <errno.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <unistd.h>
49
50#include "restore.h"
51#include "extern.h"
52
53/*
54 * Insure that all the components of a pathname exist.
55 */
56void
57pathcheck(name)
58	char *name;
59{
60	register char *cp;
61	struct entry *ep;
62	char *start;
63
64	start = strchr(name, '/');
65	if (start == 0)
66		return;
67	for (cp = start; *cp != '\0'; cp++) {
68		if (*cp != '/')
69			continue;
70		*cp = '\0';
71		ep = lookupname(name);
72		if (ep == NULL) {
73			/* Safe; we know the pathname exists in the dump. */
74			ep = addentry(name, pathsearch(name)->d_ino, NODE);
75			newnode(ep);
76		}
77		ep->e_flags |= NEW|KEEP;
78		*cp = '/';
79	}
80}
81
82/*
83 * Change a name to a unique temporary name.
84 */
85void
86mktempname(ep)
87	register struct entry *ep;
88{
89	char oldname[MAXPATHLEN];
90
91	if (ep->e_flags & TMPNAME)
92		badentry(ep, "mktempname: called with TMPNAME");
93	ep->e_flags |= TMPNAME;
94	(void) strcpy(oldname, myname(ep));
95	freename(ep->e_name);
96	ep->e_name = savename(gentempname(ep));
97	ep->e_namlen = strlen(ep->e_name);
98	renameit(oldname, myname(ep));
99}
100
101/*
102 * Generate a temporary name for an entry.
103 */
104char *
105gentempname(ep)
106	struct entry *ep;
107{
108	static char name[MAXPATHLEN];
109	struct entry *np;
110	long i = 0;
111
112	for (np = lookupino(ep->e_ino);
113	    np != NULL && np != ep; np = np->e_links)
114		i++;
115	if (np == NULL)
116		badentry(ep, "not on ino list");
117	(void) sprintf(name, "%s%d%d", TMPHDR, i, ep->e_ino);
118	return (name);
119}
120
121/*
122 * Rename a file or directory.
123 */
124void
125renameit(from, to)
126	char *from, *to;
127{
128	if (!Nflag && rename(from, to) < 0) {
129		fprintf(stderr, "warning: cannot rename %s to %s: %s\n",
130		    from, to, strerror(errno));
131		return;
132	}
133	vprintf(stdout, "rename %s to %s\n", from, to);
134}
135
136/*
137 * Create a new node (directory).
138 */
139void
140newnode(np)
141	struct entry *np;
142{
143	char *cp;
144
145	if (np->e_type != NODE)
146		badentry(np, "newnode: not a node");
147	cp = myname(np);
148	if (!Nflag && mkdir(cp, 0777) < 0) {
149		np->e_flags |= EXISTED;
150		fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
151		return;
152	}
153	vprintf(stdout, "Make node %s\n", cp);
154}
155
156/*
157 * Remove an old node (directory).
158 */
159void
160removenode(ep)
161	register struct entry *ep;
162{
163	char *cp;
164
165	if (ep->e_type != NODE)
166		badentry(ep, "removenode: not a node");
167	if (ep->e_entries != NULL)
168		badentry(ep, "removenode: non-empty directory");
169	ep->e_flags |= REMOVED;
170	ep->e_flags &= ~TMPNAME;
171	cp = myname(ep);
172	if (!Nflag && rmdir(cp) < 0) {
173		fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
174		return;
175	}
176	vprintf(stdout, "Remove node %s\n", cp);
177}
178
179/*
180 * Remove a leaf.
181 */
182void
183removeleaf(ep)
184	register struct entry *ep;
185{
186	char *cp;
187
188	if (ep->e_type != LEAF)
189		badentry(ep, "removeleaf: not a leaf");
190	ep->e_flags |= REMOVED;
191	ep->e_flags &= ~TMPNAME;
192	cp = myname(ep);
193	if (!Nflag && unlink(cp) < 0) {
194		fprintf(stderr, "warning: %s: %s\n", cp, strerror(errno));
195		return;
196	}
197	vprintf(stdout, "Remove leaf %s\n", cp);
198}
199
200/*
201 * Create a link.
202 */
203int
204linkit(existing, new, type)
205	char *existing, *new;
206	int type;
207{
208
209	if (type == SYMLINK) {
210		if (!Nflag && symlink(existing, new) < 0) {
211			fprintf(stderr,
212			    "warning: cannot create symbolic link %s->%s: %s\n",
213			    new, existing, strerror(errno));
214			return (FAIL);
215		}
216	} else if (type == HARDLINK) {
217		if (!Nflag && link(existing, new) < 0) {
218			fprintf(stderr,
219			    "warning: cannot create hard link %s->%s: %s\n",
220			    new, existing, strerror(errno));
221			return (FAIL);
222		}
223	} else {
224		panic("linkit: unknown type %d\n", type);
225		return (FAIL);
226	}
227	vprintf(stdout, "Create %s link %s->%s\n",
228		type == SYMLINK ? "symbolic" : "hard", new, existing);
229	return (GOOD);
230}
231
232/*
233 * Create a whiteout.
234 */
235int
236addwhiteout(name)
237	char *name;
238{
239
240	if (!Nflag && mknod(name, S_IFWHT, 0) < 0) {
241		fprintf(stderr, "warning: cannot create whiteout %s: %s\n",
242		    name, strerror(errno));
243		return (FAIL);
244	}
245	vprintf(stdout, "Create whiteout %s\n", name);
246	return (GOOD);
247}
248
249/*
250 * Delete a whiteout.
251 */
252void
253delwhiteout(ep)
254	register struct entry *ep;
255{
256	char *name;
257
258	if (ep->e_type != LEAF)
259		badentry(ep, "delwhiteout: not a leaf");
260	ep->e_flags |= REMOVED;
261	ep->e_flags &= ~TMPNAME;
262	name = myname(ep);
263	if (!Nflag && undelete(name) < 0) {
264		fprintf(stderr, "warning: cannot delete whiteout %s: %s\n",
265		    name, strerror(errno));
266		return;
267	}
268	vprintf(stdout, "Delete whiteout %s\n", name);
269}
270
271/*
272 * find lowest number file (above "start") that needs to be extracted
273 */
274ino_t
275lowerbnd(start)
276	ino_t start;
277{
278	register struct entry *ep;
279
280	for ( ; start < maxino; start++) {
281		ep = lookupino(start);
282		if (ep == NULL || ep->e_type == NODE)
283			continue;
284		if (ep->e_flags & (NEW|EXTRACT))
285			return (start);
286	}
287	return (start);
288}
289
290/*
291 * find highest number file (below "start") that needs to be extracted
292 */
293ino_t
294upperbnd(start)
295	ino_t start;
296{
297	register struct entry *ep;
298
299	for ( ; start > ROOTINO; start--) {
300		ep = lookupino(start);
301		if (ep == NULL || ep->e_type == NODE)
302			continue;
303		if (ep->e_flags & (NEW|EXTRACT))
304			return (start);
305	}
306	return (start);
307}
308
309/*
310 * report on a badly formed entry
311 */
312void
313badentry(ep, msg)
314	register struct entry *ep;
315	char *msg;
316{
317
318	fprintf(stderr, "bad entry: %s\n", msg);
319	fprintf(stderr, "name: %s\n", myname(ep));
320	fprintf(stderr, "parent name %s\n", myname(ep->e_parent));
321	if (ep->e_sibling != NULL)
322		fprintf(stderr, "sibling name: %s\n", myname(ep->e_sibling));
323	if (ep->e_entries != NULL)
324		fprintf(stderr, "next entry name: %s\n", myname(ep->e_entries));
325	if (ep->e_links != NULL)
326		fprintf(stderr, "next link name: %s\n", myname(ep->e_links));
327	if (ep->e_next != NULL)
328		fprintf(stderr,
329		    "next hashchain name: %s\n", myname(ep->e_next));
330	fprintf(stderr, "entry type: %s\n",
331		ep->e_type == NODE ? "NODE" : "LEAF");
332	fprintf(stderr, "inode number: %ld\n", ep->e_ino);
333	panic("flags: %s\n", flagvalues(ep));
334}
335
336/*
337 * Construct a string indicating the active flag bits of an entry.
338 */
339char *
340flagvalues(ep)
341	register struct entry *ep;
342{
343	static char flagbuf[BUFSIZ];
344
345	(void) strcpy(flagbuf, "|NIL");
346	flagbuf[0] = '\0';
347	if (ep->e_flags & REMOVED)
348		(void) strcat(flagbuf, "|REMOVED");
349	if (ep->e_flags & TMPNAME)
350		(void) strcat(flagbuf, "|TMPNAME");
351	if (ep->e_flags & EXTRACT)
352		(void) strcat(flagbuf, "|EXTRACT");
353	if (ep->e_flags & NEW)
354		(void) strcat(flagbuf, "|NEW");
355	if (ep->e_flags & KEEP)
356		(void) strcat(flagbuf, "|KEEP");
357	if (ep->e_flags & EXISTED)
358		(void) strcat(flagbuf, "|EXISTED");
359	return (&flagbuf[1]);
360}
361
362/*
363 * Check to see if a name is on a dump tape.
364 */
365ino_t
366dirlookup(name)
367	const char *name;
368{
369	struct direct *dp;
370	ino_t ino;
371
372	ino = ((dp = pathsearch(name)) == NULL) ? 0 : dp->d_ino;
373
374	if (ino == 0 || TSTINO(ino, dumpmap) == 0)
375		fprintf(stderr, "%s is not on the tape\n", name);
376	return (ino);
377}
378
379/*
380 * Elicit a reply.
381 */
382int
383reply(question)
384	char *question;
385{
386	char c;
387
388	do	{
389		fprintf(stderr, "%s? [yn] ", question);
390		(void) fflush(stderr);
391		c = getc(terminal);
392		while (c != '\n' && getc(terminal) != '\n')
393			if (feof(terminal))
394				return (FAIL);
395	} while (c != 'y' && c != 'n');
396	if (c == 'y')
397		return (GOOD);
398	return (FAIL);
399}
400
401/*
402 * handle unexpected inconsistencies
403 */
404#if __STDC__
405#include <stdarg.h>
406#else
407#include <varargs.h>
408#endif
409
410void
411#if __STDC__
412panic(const char *fmt, ...)
413#else
414panic(fmt, va_alist)
415	char *fmt;
416	va_dcl
417#endif
418{
419	va_list ap;
420#if __STDC__
421	va_start(ap, fmt);
422#else
423	va_start(ap);
424#endif
425
426	vfprintf(stderr, fmt, ap);
427	if (yflag)
428		return;
429	if (reply("abort") == GOOD) {
430		if (reply("dump core") == GOOD)
431			abort();
432		done(1);
433	}
434}
435