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/*
* Copyright 2005-2022 Gentoo Authors
* Distributed under the terms of the GNU General Public License v2
*
* Copyright 2005-2010 Ned Ludd - <solar@gentoo.org>
* Copyright 2005-2014 Mike Frysinger - <vapier@gentoo.org>
* Copyright 2018- Fabian Groffen - <grobian@gentoo.org>
*/
#include "main.h"
#include <unistd.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "stat-time.h"
#include "copy_file.h"
#include "move_file.h"
int
move_file(int rootfd_src, const char *name_src,
int rootfd_dst, const char *name_dst,
struct stat *stat_src)
{
/* first try fast path -- src/dst are same device, else
* fall back to slow path -- manual read/write */
if (renameat(rootfd_src, name_src, rootfd_dst, name_dst) != 0) {
int fd_src;
int fd_dst;
char tmpname_dst[_Q_PATH_MAX];
struct stat st;
struct timespec times[2];
fd_src = openat(rootfd_src, name_src, O_RDONLY|O_CLOEXEC);
if (fd_src < 0) {
warnp("could not read source file %s", name_src);
return fd_src;
}
if (stat_src == NULL) {
if (fstat(fd_src, &st) != 0) {
warnp("could not stat source file %s", name_src);
return -1;
}
stat_src = &st;
}
/* do not write the file in place ...
* will fail with files that are in use
* plus it isn't atomic, so we could leave a mess */
snprintf(tmpname_dst, sizeof(tmpname_dst), ".%u.%s",
getpid(), name_dst);
fd_dst = openat(rootfd_dst, tmpname_dst,
O_WRONLY|O_CLOEXEC|O_CREAT|O_TRUNC,
stat_src->st_mode);
if (fd_dst < 0) {
warnp("could not open destination file %s (for %s)",
tmpname_dst, name_dst);
close(fd_src);
return fd_dst;
}
/* make sure owner/mode is sane before we write out data */
if (fchown(fd_dst, stat_src->st_uid, stat_src->st_gid) != 0) {
warnp("could not set ownership (%zu/%zu) for %s",
(size_t)stat_src->st_uid, (size_t)stat_src->st_gid, name_dst);
return -1;
}
if (fchmod(fd_dst, stat_src->st_mode) != 0) {
warnp("could not set permission (%u) for %s",
(int)stat_src->st_mode, name_dst);
return -1;
}
/* do the actual data copy */
if (copy_file_fd(fd_src, fd_dst)) {
warnp("could not write to file %s", name_dst);
if (unlinkat(rootfd_dst, tmpname_dst, 0) != 0) {
/* don't care */;
}
close(fd_src);
close(fd_dst);
return -1;
}
/* preserve the file times */
times[0] = get_stat_atime(stat_src);
times[1] = get_stat_mtime(stat_src);
futimens(fd_dst, times);
close(fd_src);
close(fd_dst);
/* move the new tmp dst file to the right place, which
* should be on the same FS/device now */
if (renameat(rootfd_dst, tmpname_dst, rootfd_dst, name_dst)) {
warnp("could not rename %s to %s", tmpname_dst, name_dst);
return -1;
}
/* finally remove the source file */
return unlinkat(rootfd_src, name_src, 0);
}
return 0;
}
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