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-rw-r--r--src/shared/copy.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/src/shared/copy.c b/src/shared/copy.c
new file mode 100644
index 0000000000..4dfc2f3fca
--- /dev/null
+++ b/src/shared/copy.c
@@ -0,0 +1,292 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2014 Lennart Poettering
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "util.h"
+#include "copy.h"
+
+static int stream_bytes(int fdf, int fdt) {
+ assert(fdf >= 0);
+ assert(fdt >= 0);
+
+ for (;;) {
+ char buf[PIPE_BUF];
+ ssize_t n, k;
+
+ n = read(fdf, buf, sizeof(buf));
+ if (n < 0)
+ return -errno;
+ if (n == 0)
+ break;
+
+ errno = 0;
+ k = loop_write(fdt, buf, n, false);
+ if (k < 0)
+ return k;
+ if (k != n)
+ return errno ? -errno : -EIO;
+ }
+
+ return 0;
+}
+
+static int fd_copy_symlink(int df, const char *from, const struct stat *st, int dt, const char *to) {
+ _cleanup_free_ char *target = NULL;
+ int r;
+
+ assert(from);
+ assert(st);
+ assert(to);
+
+ r = readlinkat_malloc(df, from, &target);
+ if (r < 0)
+ return r;
+
+ if (symlinkat(target, dt, to) < 0) {
+ if (errno == EEXIST)
+ return 0;
+
+ return -errno;
+ }
+
+ if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int fd_copy_regular(int df, const char *from, const struct stat *st, int dt, const char *to) {
+ _cleanup_close_ int fdf = -1, fdt = -1;
+ int r, q;
+
+ assert(from);
+ assert(st);
+ assert(to);
+
+ fdf = openat(df, from, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fdf < 0)
+ return -errno;
+
+ fdt = openat(dt, to, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, st->st_mode & 07777);
+ if (fdt < 0) {
+ if (errno == EEXIST)
+ return 0;
+
+ return -errno;
+ }
+
+ r = stream_bytes(fdf, fdt);
+ if (r < 0) {
+ unlinkat(dt, to, 0);
+ return r;
+ }
+
+ if (fchown(fdt, st->st_uid, st->st_gid) < 0)
+ r = -errno;
+
+ if (fchmod(fdt, st->st_mode & 07777) < 0)
+ r = -errno;
+
+ q = close(fdt);
+ fdt = -1;
+
+ if (q < 0) {
+ r = -errno;
+ unlinkat(dt, to, 0);
+ }
+
+ return r;
+}
+
+static int fd_copy_fifo(int df, const char *from, const struct stat *st, int dt, const char *to) {
+ int r;
+
+ assert(from);
+ assert(st);
+ assert(to);
+
+ r = mkfifoat(dt, to, st->st_mode & 07777);
+ if (r < 0) {
+ if (errno == EEXIST)
+ return 0;
+
+ return -errno;
+ }
+
+ if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
+ r = -errno;
+
+ if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0)
+ r = -errno;
+
+ return r;
+}
+
+static int fd_copy_node(int df, const char *from, const struct stat *st, int dt, const char *to) {
+ int r;
+
+ assert(from);
+ assert(st);
+ assert(to);
+
+ r = mknodat(dt, to, st->st_mode, st->st_rdev);
+ if (r < 0) {
+ if (errno == EEXIST)
+ return 0;
+
+ return -errno;
+ }
+
+ if (fchownat(dt, to, st->st_uid, st->st_gid, AT_SYMLINK_NOFOLLOW) < 0)
+ r = -errno;
+
+ if (fchmodat(dt, to, st->st_mode & 07777, 0) < 0)
+ r = -errno;
+
+ return r;
+}
+
+static int fd_copy_directory(int df, const char *from, const struct stat *st, int dt, const char *to, dev_t original_device) {
+ _cleanup_close_ int fdf = -1, fdt = -1;
+ _cleanup_closedir_ DIR *d = NULL;
+ struct dirent *de;
+ bool created;
+ int r;
+
+ assert(from);
+ assert(st);
+ assert(to);
+
+ fdf = openat(df, from, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fdf < 0)
+ return -errno;
+
+ d = fdopendir(fdf);
+ if (!d)
+ return -errno;
+ fdf = -1;
+
+ r = mkdirat(dt, to, st->st_mode & 07777);
+ if (r >= 0)
+ created = true;
+ else if (errno == EEXIST)
+ created = false;
+ else
+ return -errno;
+
+ fdt = openat(dt, to, O_RDONLY|O_DIRECTORY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
+ if (fdt < 0)
+ return -errno;
+
+ if (created) {
+ if (fchown(fdt, st->st_uid, st->st_gid) < 0)
+ r = -errno;
+
+ if (fchmod(fdt, st->st_mode & 07777) < 0)
+ r = -errno;
+ }
+
+ FOREACH_DIRENT(de, d, return -errno) {
+ struct stat buf;
+ int q;
+
+ if (fstatat(dirfd(d), de->d_name, &buf, AT_SYMLINK_NOFOLLOW) < 0) {
+ r = -errno;
+ continue;
+ }
+
+ if (buf.st_dev != original_device)
+ continue;
+
+ if (S_ISREG(buf.st_mode))
+ q = fd_copy_regular(dirfd(d), de->d_name, &buf, fdt, de->d_name);
+ else if (S_ISDIR(buf.st_mode))
+ q = fd_copy_directory(dirfd(d), de->d_name, &buf, fdt, de->d_name, original_device);
+ else if (S_ISLNK(buf.st_mode))
+ q = fd_copy_symlink(dirfd(d), de->d_name, &buf, fdt, de->d_name);
+ else if (S_ISFIFO(buf.st_mode))
+ q = fd_copy_fifo(dirfd(d), de->d_name, &buf, fdt, de->d_name);
+ else if (S_ISBLK(buf.st_mode) || S_ISCHR(buf.st_mode))
+ q = fd_copy_node(dirfd(d), de->d_name, &buf, fdt, de->d_name);
+ else
+ q = -ENOTSUP;
+
+ if (q < 0)
+ r = q;
+ }
+
+ return r;
+}
+
+int copy_tree(const char *from, const char *to) {
+ struct stat st;
+
+ assert(from);
+ assert(to);
+
+ if (lstat(from, &st) < 0)
+ return -errno;
+
+ if (S_ISREG(st.st_mode))
+ return fd_copy_regular(AT_FDCWD, from, &st, AT_FDCWD, to);
+ else if (S_ISDIR(st.st_mode))
+ return fd_copy_directory(AT_FDCWD, from, &st, AT_FDCWD, to, st.st_dev);
+ else if (S_ISLNK(st.st_mode))
+ return fd_copy_symlink(AT_FDCWD, from, &st, AT_FDCWD, to);
+ else if (S_ISFIFO(st.st_mode))
+ return fd_copy_fifo(AT_FDCWD, from, &st, AT_FDCWD, to);
+ else if (S_ISBLK(st.st_mode) || S_ISCHR(st.st_mode))
+ return fd_copy_node(AT_FDCWD, from, &st, AT_FDCWD, to);
+ else
+ return -ENOTSUP;
+}
+
+int copy_file(const char *from, const char *to, int flags, mode_t mode) {
+ _cleanup_close_ int fdf = -1, fdt = -1;
+ int r;
+
+ assert(from);
+ assert(to);
+
+ fdf = open(from, O_RDONLY|O_CLOEXEC|O_NOCTTY);
+ if (fdf < 0)
+ return -errno;
+
+ fdt = open(to, flags|O_WRONLY|O_CREAT|O_CLOEXEC|O_NOCTTY, mode);
+ if (fdt < 0)
+ return -errno;
+
+ r = stream_bytes(fdf, fdt);
+ if (r < 0) {
+ unlink(to);
+ return r;
+ }
+
+ r = close(fdt);
+ fdt = -1;
+
+ if (r < 0) {
+ r = -errno;
+ unlink(to);
+ return r;
+ }
+
+ return 0;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-12-03 10:52:46 +0000