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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/import/import-tar.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/import/import-tar.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/src/import/import-tar.c b/src/import/import-tar.c new file mode 100644 index 0000000..f31d3d7 --- /dev/null +++ b/src/import/import-tar.c @@ -0,0 +1,381 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <linux/fs.h> + +#include "sd-daemon.h" +#include "sd-event.h" + +#include "alloc-util.h" +#include "btrfs-util.h" +#include "copy.h" +#include "fd-util.h" +#include "fileio.h" +#include "fs-util.h" +#include "hostname-util.h" +#include "import-common.h" +#include "import-compress.h" +#include "import-tar.h" +#include "install-file.h" +#include "io-util.h" +#include "machine-pool.h" +#include "mkdir-label.h" +#include "path-util.h" +#include "process-util.h" +#include "qcow2-util.h" +#include "ratelimit.h" +#include "rm-rf.h" +#include "string-util.h" +#include "tmpfile-util.h" +#include "util.h" + +struct TarImport { + sd_event *event; + + char *image_root; + + TarImportFinished on_finished; + void *userdata; + + char *local; + ImportFlags flags; + + char *temp_path; + char *final_path; + + int input_fd; + int tar_fd; + + ImportCompress compress; + + sd_event_source *input_event_source; + + uint8_t buffer[16*1024]; + size_t buffer_size; + + uint64_t written_compressed; + uint64_t written_uncompressed; + + struct stat input_stat; + + pid_t tar_pid; + + unsigned last_percent; + RateLimit progress_ratelimit; +}; + +TarImport* tar_import_unref(TarImport *i) { + if (!i) + return NULL; + + sd_event_source_unref(i->input_event_source); + + if (i->tar_pid > 1) + sigkill_wait(i->tar_pid); + + rm_rf_subvolume_and_free(i->temp_path); + + import_compress_free(&i->compress); + + sd_event_unref(i->event); + + safe_close(i->tar_fd); + + free(i->final_path); + free(i->image_root); + free(i->local); + return mfree(i); +} + +int tar_import_new( + TarImport **ret, + sd_event *event, + const char *image_root, + TarImportFinished on_finished, + void *userdata) { + + _cleanup_(tar_import_unrefp) TarImport *i = NULL; + _cleanup_free_ char *root = NULL; + int r; + + assert(ret); + + root = strdup(image_root ?: "/var/lib/machines"); + if (!root) + return -ENOMEM; + + i = new(TarImport, 1); + if (!i) + return -ENOMEM; + + *i = (TarImport) { + .input_fd = -1, + .tar_fd = -1, + .on_finished = on_finished, + .userdata = userdata, + .last_percent = UINT_MAX, + .image_root = TAKE_PTR(root), + .progress_ratelimit = { 100 * USEC_PER_MSEC, 1 }, + }; + + if (event) + i->event = sd_event_ref(event); + else { + r = sd_event_default(&i->event); + if (r < 0) + return r; + } + + *ret = TAKE_PTR(i); + + return 0; +} + +static void tar_import_report_progress(TarImport *i) { + unsigned percent; + assert(i); + + /* We have no size information, unless the source is a regular file */ + if (!S_ISREG(i->input_stat.st_mode)) + return; + + if (i->written_compressed >= (uint64_t) i->input_stat.st_size) + percent = 100; + else + percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->input_stat.st_size); + + if (percent == i->last_percent) + return; + + if (!ratelimit_below(&i->progress_ratelimit)) + return; + + sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent); + log_info("Imported %u%%.", percent); + + i->last_percent = percent; +} + +static int tar_import_finish(TarImport *i) { + const char *d; + int r; + + assert(i); + assert(i->tar_fd >= 0); + + i->tar_fd = safe_close(i->tar_fd); + + if (i->tar_pid > 0) { + r = wait_for_terminate_and_check("tar", TAKE_PID(i->tar_pid), WAIT_LOG); + if (r < 0) + return r; + if (r != EXIT_SUCCESS) + return -EPROTO; + } + + assert_se(d = i->temp_path ?: i->local); + + r = import_mangle_os_tree(d); + if (r < 0) + return r; + + r = install_file( + AT_FDCWD, d, + AT_FDCWD, i->final_path, + (i->flags & IMPORT_FORCE ? INSTALL_REPLACE : 0) | + (i->flags & IMPORT_READ_ONLY ? INSTALL_READ_ONLY : 0) | + (i->flags & IMPORT_SYNC ? INSTALL_SYNCFS : 0)); + if (r < 0) + return log_error_errno(r, "Failed to move '%s' into place: %m", i->final_path ?: i->local); + + i->temp_path = mfree(i->temp_path); + + return 0; +} + +static int tar_import_fork_tar(TarImport *i) { + const char *d, *root; + int r; + + assert(i); + assert(i->local); + assert(!i->final_path); + assert(!i->temp_path); + assert(i->tar_fd < 0); + + if (i->flags & IMPORT_DIRECT) { + d = i->local; + root = NULL; + } else { + i->final_path = path_join(i->image_root, i->local); + if (!i->final_path) + return log_oom(); + + r = tempfn_random(i->final_path, NULL, &i->temp_path); + if (r < 0) + return log_oom(); + + d = i->temp_path; + root = i->image_root; + } + + assert(d); + + (void) mkdir_parents_label(d, 0700); + + if (FLAGS_SET(i->flags, IMPORT_DIRECT|IMPORT_FORCE)) + (void) rm_rf(d, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME); + + if (i->flags & IMPORT_BTRFS_SUBVOL) + r = btrfs_subvol_make_fallback(d, 0755); + else + r = RET_NERRNO(mkdir(d, 0755)); + if (r == -EEXIST && (i->flags & IMPORT_DIRECT)) /* EEXIST is OK if in direct mode, but not otherwise, + * because in that case our temporary path collided */ + r = 0; + if (r < 0) + return log_error_errno(r, "Failed to create directory/subvolume %s: %m", d); + if (r > 0 && (i->flags & IMPORT_BTRFS_QUOTA)) { /* actually btrfs subvol */ + if (!(i->flags & IMPORT_DIRECT)) + (void) import_assign_pool_quota_and_warn(root); + (void) import_assign_pool_quota_and_warn(d); + } + + i->tar_fd = import_fork_tar_x(d, &i->tar_pid); + if (i->tar_fd < 0) + return i->tar_fd; + + return 0; +} + +static int tar_import_write(const void *p, size_t sz, void *userdata) { + TarImport *i = userdata; + int r; + + r = loop_write(i->tar_fd, p, sz, false); + if (r < 0) + return r; + + i->written_uncompressed += sz; + + return 0; +} + +static int tar_import_process(TarImport *i) { + ssize_t l; + int r; + + assert(i); + assert(i->buffer_size < sizeof(i->buffer)); + + l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size); + if (l < 0) { + if (errno == EAGAIN) + return 0; + + r = log_error_errno(errno, "Failed to read input file: %m"); + goto finish; + } + + i->buffer_size += l; + + if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) { + + if (l == 0) { /* EOF */ + log_debug("File too short to be compressed, as no compression signature fits in, thus assuming uncompressed."); + import_uncompress_force_off(&i->compress); + } else { + r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size); + if (r < 0) { + log_error_errno(r, "Failed to detect file compression: %m"); + goto finish; + } + if (r == 0) /* Need more data */ + return 0; + } + + r = tar_import_fork_tar(i); + if (r < 0) + goto finish; + } + + r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_import_write, i); + if (r < 0) { + log_error_errno(r, "Failed to decode and write: %m"); + goto finish; + } + + i->written_compressed += i->buffer_size; + i->buffer_size = 0; + + if (l == 0) { /* EOF */ + r = tar_import_finish(i); + goto finish; + } + + tar_import_report_progress(i); + + return 0; + +finish: + if (i->on_finished) + i->on_finished(i, r, i->userdata); + else + sd_event_exit(i->event, r); + + return 0; +} + +static int tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) { + TarImport *i = userdata; + + return tar_import_process(i); +} + +static int tar_import_on_defer(sd_event_source *s, void *userdata) { + TarImport *i = userdata; + + return tar_import_process(i); +} + +int tar_import_start(TarImport *i, int fd, const char *local, ImportFlags flags) { + int r; + + assert(i); + assert(fd >= 0); + assert(local); + assert(!(flags & ~IMPORT_FLAGS_MASK_TAR)); + + if (!import_validate_local(local, flags)) + return -EINVAL; + + if (i->input_fd >= 0) + return -EBUSY; + + r = fd_nonblock(fd, true); + if (r < 0) + return r; + + r = free_and_strdup(&i->local, local); + if (r < 0) + return r; + + i->flags = flags; + + if (fstat(fd, &i->input_stat) < 0) + return -errno; + + r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_import_on_input, i); + if (r == -EPERM) { + /* This fd does not support epoll, for example because it is a regular file. Busy read in that case */ + r = sd_event_add_defer(i->event, &i->input_event_source, tar_import_on_defer, i); + if (r < 0) + return r; + + r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON); + } + if (r < 0) + return r; + + i->input_fd = fd; + return 0; +} |