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-rw-r--r--src/import/import-tar.c380
1 files changed, 380 insertions, 0 deletions
diff --git a/src/import/import-tar.c b/src/import/import-tar.c
new file mode 100644
index 0000000..9020270
--- /dev/null
+++ b/src/import/import-tar.c
@@ -0,0 +1,380 @@
+/* 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"
+
+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 = -EBADF,
+ .tar_fd = -EBADF,
+ .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(AT_FDCWD, 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);
+ 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-19 22:17:13 +0000