mirror of
https://github.com/libguestfs/libguestfs.git
synced 2026-03-22 07:03:38 +00:00
147 lines
3.2 KiB
C
147 lines
3.2 KiB
C
/* libguestfs - the guestfsd daemon
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* Copyright (C) 2009 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <limits.h>
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#include "areadlink.h"
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#include "daemon.h"
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#include "actions.h"
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char **
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do_internal_readlinklist (const char *path, char *const *names)
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{
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int fd_cwd;
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size_t i;
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CLEANUP_FREE_STRINGSBUF DECLARE_STRINGSBUF (ret);
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CHROOT_IN;
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fd_cwd = open (path, O_RDONLY|O_DIRECTORY|O_CLOEXEC);
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CHROOT_OUT;
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if (fd_cwd == -1) {
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reply_with_perror ("open: %s", path);
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return NULL;
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}
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for (i = 0; names[i] != NULL; ++i) {
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/* Because of the way this function is intended to be used,
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* we actually expect to see errors here, and they are not fatal.
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*/
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CLEANUP_FREE char *link = areadlinkat (fd_cwd, names[i]);
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if (link != NULL) {
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if (add_string (&ret, link) == -1) {
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add_string_failed:
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close (fd_cwd);
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return NULL;
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}
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} else {
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if (add_string (&ret, "") == -1)
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goto add_string_failed;
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}
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}
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close (fd_cwd);
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if (end_stringsbuf (&ret) == -1)
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return NULL;
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return take_stringsbuf (&ret);
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}
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int
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do_ln (const char *target, const char *linkname)
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{
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int r;
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CHROOT_IN;
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r = link (target, linkname);
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CHROOT_OUT;
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if (r == -1) {
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reply_with_perror ("link: %s: %s", target, linkname);
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return -1;
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}
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return 0;
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}
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int
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do_ln_f (const char *target, const char *linkname)
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{
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int r;
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CHROOT_IN;
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unlink (linkname);
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r = link (target, linkname);
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CHROOT_OUT;
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if (r == -1) {
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reply_with_perror ("link: %s: %s", target, linkname);
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return -1;
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}
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return 0;
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}
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static int
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_symlink (const char *flag, const char *target, const char *linkname)
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{
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int r;
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CLEANUP_FREE char *err = NULL;
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CLEANUP_FREE char *buf_linkname = NULL;
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/* Prefix linkname with sysroot. */
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buf_linkname = sysroot_path (linkname);
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if (!buf_linkname) {
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reply_with_perror ("malloc");
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return -1;
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}
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r = command (NULL, &err,
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"ln", flag, "--", /* target could begin with '-' */
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target, buf_linkname, NULL);
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if (r == -1) {
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reply_with_error ("ln %s: %s: %s: %s",
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flag, target, linkname, err);
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return -1;
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}
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return 0;
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}
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int
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do_ln_s (const char *target, const char *linkname)
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{
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return _symlink ("-s", target, linkname);
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}
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int
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do_ln_sf (const char *target, const char *linkname)
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{
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return _symlink ("-sf", target, linkname);
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}
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