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/* libguestfs - the guestfsd daemon
* Copyright (C) 2009 Red Hat Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <limits.h>
#include "areadlink.h"
#include "daemon.h"
#include "actions.h"
char **
do_internal_readlinklist (const char *path, char *const *names)
{
int fd_cwd;
size_t i;
CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (ret);
CHROOT_IN;
fd_cwd = open (path, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
CHROOT_OUT;
if (fd_cwd == -1) {
reply_with_perror ("open: %s", path);
return NULL;
}
for (i = 0; names[i] != NULL; ++i) {
/* Because of the way this function is intended to be used,
* we actually expect to see errors here, and they are not fatal.
*/
CLEANUP_FREE char *link = areadlinkat (fd_cwd, names[i]);
if (link != NULL) {
if (add_string (&ret, link) == -1) {
add_string_failed:
close (fd_cwd);
return NULL;
}
} else {
if (add_string (&ret, "") == -1)
goto add_string_failed;
}
}
close (fd_cwd);
if (end_stringsbuf (&ret) == -1)
return NULL;
return take_stringsbuf (&ret);
}
int
do_ln (const char *target, const char *linkname)
{
int r;
CHROOT_IN;
r = link (target, linkname);
CHROOT_OUT;
if (r == -1) {
reply_with_perror ("link: %s: %s", target, linkname);
return -1;
}
return 0;
}
int
do_ln_f (const char *target, const char *linkname)
{
int r;
CHROOT_IN;
unlink (linkname);
r = link (target, linkname);
CHROOT_OUT;
if (r == -1) {
reply_with_perror ("link: %s: %s", target, linkname);
return -1;
}
return 0;
}
static int
_symlink (const char *flag, const char *target, const char *linkname)
{
int r;
CLEANUP_FREE char *err = NULL;
CLEANUP_FREE char *buf_linkname = NULL;
/* Prefix linkname with sysroot. */
buf_linkname = sysroot_path (linkname);
if (!buf_linkname) {
reply_with_perror ("malloc");
return -1;
}
r = command (NULL, &err,
"ln", flag, "--", /* target could begin with '-' */
target, buf_linkname, NULL);
if (r == -1) {
reply_with_error ("ln %s: %s: %s: %s",
flag, target, linkname, err);
return -1;
}
return 0;
}
int
do_ln_s (const char *target, const char *linkname)
{
return _symlink ("-s", target, linkname);
}
int
do_ln_sf (const char *target, const char *linkname)
{
return _symlink ("-sf", target, linkname);
}
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