0c69794138
These lines are generally out-of-date, incomplete and unnecessary. With SPDX and git repository much more accurate and fine grained information about licensing and authorship is available, hence let's drop the per-file copyright notice. Of course, removing copyright lines of others is problematic, hence this commit only removes my own lines and leaves all others untouched. It might be nicer if sooner or later those could go away too, making git the only and accurate source of authorship information.
150 lines
4.7 KiB
C
150 lines
4.7 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <sched.h>
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#include <sys/prctl.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "btrfs-util.h"
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#include "capability-util.h"
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#include "fd-util.h"
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#include "import-common.h"
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#include "process-util.h"
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#include "signal-util.h"
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#include "util.h"
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int import_make_read_only_fd(int fd) {
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int r;
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assert(fd >= 0);
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/* First, let's make this a read-only subvolume if it refers
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* to a subvolume */
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r = btrfs_subvol_set_read_only_fd(fd, true);
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if (IN_SET(r, -ENOTTY, -ENOTDIR, -EINVAL)) {
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struct stat st;
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/* This doesn't refer to a subvolume, or the file
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* system isn't even btrfs. In that, case fall back to
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* chmod()ing */
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r = fstat(fd, &st);
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if (r < 0)
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return log_error_errno(errno, "Failed to stat temporary image: %m");
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/* Drop "w" flag */
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if (fchmod(fd, st.st_mode & 07555) < 0)
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return log_error_errno(errno, "Failed to chmod() final image: %m");
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return 0;
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} else if (r < 0)
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return log_error_errno(r, "Failed to make subvolume read-only: %m");
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return 0;
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}
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int import_make_read_only(const char *path) {
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_cleanup_close_ int fd = 1;
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fd = open(path, O_RDONLY|O_NOCTTY|O_CLOEXEC);
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if (fd < 0)
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return log_error_errno(errno, "Failed to open %s: %m", path);
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return import_make_read_only_fd(fd);
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}
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int import_fork_tar_x(const char *path, pid_t *ret) {
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_cleanup_close_pair_ int pipefd[2] = { -1, -1 };
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pid_t pid;
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int r;
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assert(path);
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assert(ret);
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if (pipe2(pipefd, O_CLOEXEC) < 0)
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return log_error_errno(errno, "Failed to create pipe for tar: %m");
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r = safe_fork("(tar)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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uint64_t retain =
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(1ULL << CAP_CHOWN) |
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(1ULL << CAP_FOWNER) |
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(1ULL << CAP_FSETID) |
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(1ULL << CAP_MKNOD) |
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(1ULL << CAP_SETFCAP) |
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(1ULL << CAP_DAC_OVERRIDE);
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/* Child */
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pipefd[1] = safe_close(pipefd[1]);
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r = rearrange_stdio(pipefd[0], -1, STDERR_FILENO);
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if (r < 0) {
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log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
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_exit(EXIT_FAILURE);
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}
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if (unshare(CLONE_NEWNET) < 0)
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log_error_errno(errno, "Failed to lock tar into network namespace, ignoring: %m");
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r = capability_bounding_set_drop(retain, true);
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if (r < 0)
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log_error_errno(r, "Failed to drop capabilities, ignoring: %m");
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execlp("tar", "tar", "--numeric-owner", "-C", path, "-px", "--xattrs", "--xattrs-include=*", NULL);
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log_error_errno(errno, "Failed to execute tar: %m");
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_exit(EXIT_FAILURE);
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}
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*ret = pid;
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return TAKE_FD(pipefd[1]);
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}
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int import_fork_tar_c(const char *path, pid_t *ret) {
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_cleanup_close_pair_ int pipefd[2] = { -1, -1 };
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pid_t pid;
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int r;
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assert(path);
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assert(ret);
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if (pipe2(pipefd, O_CLOEXEC) < 0)
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return log_error_errno(errno, "Failed to create pipe for tar: %m");
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r = safe_fork("(tar)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
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if (r < 0)
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return r;
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if (r == 0) {
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uint64_t retain = (1ULL << CAP_DAC_OVERRIDE);
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/* Child */
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pipefd[0] = safe_close(pipefd[0]);
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r = rearrange_stdio(-1, pipefd[1], STDERR_FILENO);
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if (r < 0) {
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log_error_errno(r, "Failed to rearrange stdin/stdout: %m");
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_exit(EXIT_FAILURE);
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}
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if (unshare(CLONE_NEWNET) < 0)
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log_error_errno(errno, "Failed to lock tar into network namespace, ignoring: %m");
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r = capability_bounding_set_drop(retain, true);
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if (r < 0)
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log_error_errno(r, "Failed to drop capabilities, ignoring: %m");
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execlp("tar", "tar", "-C", path, "-c", "--xattrs", "--xattrs-include=*", ".", NULL);
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log_error_errno(errno, "Failed to execute tar: %m");
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_exit(EXIT_FAILURE);
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}
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*ret = pid;
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return TAKE_FD(pipefd[0]);
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}
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