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ln: Allow a trailing slash when creating a link to a directory.

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In the 'ln source... directory' synopsis, the basename of each source
determines the name of the created link. Determine this using basename(3)
instead of strrchr(..., '/') which is incorrect if the pathname ends in a
slash.

The patch is somewhat changed to allow for basename(3) implementations that
change the passed pathname, and to fix the -w option's checking also.
The code to compare directory entries only applies to hard links, which
cannot be created to directories using ln.

Example:
  ln -s /etc/defaults/ /tmp
This should create a symlink named defaults.

PR:		121568
Submitted by:	Ighighi
MFC after:	1 week
This commit is contained in:
Jilles Tjoelker 2010-04-21 21:57:03 +00:00
parent 3acd904d85
commit dc00aa5dd6
1 changed files with 13 additions and 14 deletions
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27
bin/ln/ln.c
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@ -47,6 +47,7 @@ __FBSDID("$FreeBSD$");
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
@ -226,6 +227,7 @@ linkit(const char *source, const char *target, int isdir)
int ch, exists, first;
char path[PATH_MAX];
char wbuf[PATH_MAX];
char bbuf[PATH_MAX];
if (!sflag) {
/* If source doesn't exist, quit now. */
@ -248,11 +250,9 @@ linkit(const char *source, const char *target, int isdir)
if (isdir ||
(lstat(target, &sb) == 0 && S_ISDIR(sb.st_mode)) ||
(!hflag && stat(target, &sb) == 0 && S_ISDIR(sb.st_mode))) {
if ((p = strrchr(source, '/')) == NULL)
p = source;
else
++p;
if (snprintf(path, sizeof(path), "%s/%s", target, p) >=
if (strlcpy(bbuf, source, sizeof(bbuf)) >= sizeof(bbuf) ||
(p = basename(bbuf)) == NULL ||
snprintf(path, sizeof(path), "%s/%s", target, p) >=
(ssize_t)sizeof(path)) {
errno = ENAMETOOLONG;
warn("%s", source);
@ -276,15 +276,14 @@ linkit(const char *source, const char *target, int isdir)
* absolute path of the source, by appending `source'
* to the parent directory of the target.
*/
p = strrchr(target, '/');
if (p != NULL)
p++;
else
p = target;
(void)snprintf(wbuf, sizeof(wbuf), "%.*s%s",
(int)(p - target), target, source);
if (stat(wbuf, &sb) != 0)
warn("warning: %s", source);
strlcpy(bbuf, target, sizeof(bbuf));
p = dirname(bbuf);
if (p != NULL) {
(void)snprintf(wbuf, sizeof(wbuf), "%s/%s",
p, source);
if (stat(wbuf, &sb) != 0)
warn("warning: %s", source);
}
}
}