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);
185 if (fchown(fdt, st->st_uid, st->st_gid) < 0)
188 if (fchmod(fdt, st->st_mode & 07777) < 0)
192 FOREACH_DIRENT(de, d, return -errno) {
196 if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) {
201 if (buf.st_dev != original_device)
204 if (S_ISREG(buf.st_mode))
205 q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name);
206 else if (S_ISDIR(buf.st_mode))
207 q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device, merge);
208 else if (S_ISLNK(buf.st_mode))
209 q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name);
210 else if (S_ISFIFO(buf.st_mode))
211 q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name);
212 else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode))
213 q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name);
217 if (q == -EEXIST && merge)
227 int copy_tree(const char *from, const char *to, bool merge) {
233 if (lstat(from, &st) < 0)
236 if (S_ISREG(st.st_mode))
237 return fd_copy_regular(AT_FDCWD, from, &st, AT_FDCWD, to);
238 else if (S_ISDIR(st.st_mode))
239 return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev, merge);
240 else if (S_ISLNK(st.st_mode))
241 return fd_copy_symlink(AT_FDCWD, from, &st, AT_FDCWD, to);
242 else if (S_ISFIFO(st.st_mode))
243 return fd_copy_fifo(AT_FDCWD, from, &st, AT_FDCWD, to);
244 else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode))
245 return fd_copy_node(AT_FDCWD, from, &st, AT_FDCWD, to);
250 int copy_file(const char *from, const char *to, int flags, mode_t mode) {
251 _cleanup_close_ int fdf = -1, fdt = -1;
257 fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
261 fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
265 r = copy_bytes(fdf, fdt);