1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2014 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 int copy_bytes(int fdf, int fdt) {
33 n = read(fdf, buf, sizeof(buf));
40 k = loop_write(fdt, buf, n, false);
44 return errno ? -errno : -EIO;
50 static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) {
51 _cleanup_free_ char *target = NULL;
58 r = readlinkat_malloc(df, from, &target);
62 if (symlinkat(target, dt, to) < 0)
65 if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
71 static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) {
72 _cleanup_close_ int fdf = -1, fdt = -1;
79 fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
83 fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777);
87 r = copy_bytes(fdf, fdt);
93 if (fchown(fdt, st->st_uid, st->st_gid) < 0)
96 if (fchmod(fdt, st->st_mode & 07777) < 0)
110 static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) {
117 r = mkfifoat(dt, to, st->st_mode & 07777);
121 if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
124 if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0)
130 static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) {
137 r = mknodat(dt, to, st->st_mode, st->st_rdev);
141 if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
144 if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0)
150 static int fd_copy_directory(int df, const char *from, const struct stat *st, int dt, const char *to, dev_t original_device, bool merge) {
151 _cleanup_close_ int fdf = -1, fdt = -1;
152 _cleanup_closedir_ DIR *d = NULL;
161 fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
170 r = mkdirat(dt, to, st->st_mode & 07777);
173 else if (errno == EEXIST && merge)
178 fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
183 if (fchown(fdt, st->st_uid, st->st_gid) < 0)
186 if (fchmod(fdt, st->st_mode & 07777) < 0)
191 FOREACH_DIRENT(de, d, return -errno) {
195 if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) {
200 if (buf.st_dev != original_device)
203 if (S_ISREG(buf.st_mode))
204 q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name);
205 else if (S_ISDIR(buf.st_mode))
206 q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge);
207 else if (S_ISLNK(buf.st_mode))
208 q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name);
209 else if (S_ISFIFO(buf.st_mode))
210 q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name);
211 else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode))
212 q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name);
216 if (q == -EEXIST && merge)
226 int copy_tree(const char *from, const char *to, bool merge) {
232 if (lstat(from, &st) < 0)
235 if (S_ISREG(st.st_mode))
236 return fd_copy_regular(AT_FDCWD, from, &st, AT_FDCWD, to);
237 else if (S_ISDIR(st.st_mode))
238 return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev, merge);
239 else if (S_ISLNK(st.st_mode))
240 return fd_copy_symlink(AT_FDCWD, from, &st, AT_FDCWD, to);
241 else if (S_ISFIFO(st.st_mode))
242 return fd_copy_fifo(AT_FDCWD, from, &st, AT_FDCWD, to);
243 else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode))
244 return fd_copy_node(AT_FDCWD, from, &st, AT_FDCWD, to);
249 int copy_file(const char *from, const char *to, int flags, mode_t mode) {
250 _cleanup_close_ int fdf = -1, fdt = -1;
256 fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
260 fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
264 r = copy_bytes(fdf, fdt);