367 lines
9.4 KiB
C
367 lines
9.4 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <linux/fs.h>
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#include "sd-daemon.h"
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#include "sd-event.h"
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#include "alloc-util.h"
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#include "btrfs-util.h"
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#include "copy.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "hostname-util.h"
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#include "import-common.h"
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#include "import-compress.h"
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#include "import-tar.h"
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#include "io-util.h"
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#include "machine-pool.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "qcow2-util.h"
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#include "ratelimit.h"
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#include "rm-rf.h"
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#include "string-util.h"
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#include "util.h"
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struct TarImport {
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sd_event *event;
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char *image_root;
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TarImportFinished on_finished;
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void *userdata;
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char *local;
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bool force_local;
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bool read_only;
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char *temp_path;
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char *final_path;
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int input_fd;
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int tar_fd;
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ImportCompress compress;
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sd_event_source *input_event_source;
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uint8_t buffer[16*1024];
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size_t buffer_size;
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uint64_t written_compressed;
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uint64_t written_uncompressed;
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struct stat st;
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pid_t tar_pid;
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unsigned last_percent;
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RateLimit progress_rate_limit;
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};
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TarImport* tar_import_unref(TarImport *i) {
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if (!i)
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return NULL;
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sd_event_source_unref(i->input_event_source);
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if (i->tar_pid > 1) {
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(void) kill_and_sigcont(i->tar_pid, SIGKILL);
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(void) wait_for_terminate(i->tar_pid, NULL);
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}
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if (i->temp_path) {
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(void) rm_rf(i->temp_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
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free(i->temp_path);
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}
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import_compress_free(&i->compress);
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sd_event_unref(i->event);
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safe_close(i->tar_fd);
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free(i->final_path);
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free(i->image_root);
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free(i->local);
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return mfree(i);
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}
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int tar_import_new(
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TarImport **ret,
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sd_event *event,
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const char *image_root,
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TarImportFinished on_finished,
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void *userdata) {
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_cleanup_(tar_import_unrefp) TarImport *i = NULL;
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_cleanup_free_ char *root = NULL;
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int r;
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assert(ret);
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root = strdup(image_root ?: "/var/lib/machines");
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if (!root)
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return -ENOMEM;
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i = new(TarImport, 1);
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if (!i)
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return -ENOMEM;
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*i = (TarImport) {
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.input_fd = -1,
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.tar_fd = -1,
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.on_finished = on_finished,
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.userdata = userdata,
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.last_percent = (unsigned) -1,
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.image_root = TAKE_PTR(root),
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};
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RATELIMIT_INIT(i->progress_rate_limit, 100 * USEC_PER_MSEC, 1);
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if (event)
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i->event = sd_event_ref(event);
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else {
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r = sd_event_default(&i->event);
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if (r < 0)
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return r;
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}
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*ret = TAKE_PTR(i);
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return 0;
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}
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static void tar_import_report_progress(TarImport *i) {
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unsigned percent;
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assert(i);
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/* We have no size information, unless the source is a regular file */
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if (!S_ISREG(i->st.st_mode))
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return;
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if (i->written_compressed >= (uint64_t) i->st.st_size)
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percent = 100;
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else
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percent = (unsigned) ((i->written_compressed * UINT64_C(100)) / (uint64_t) i->st.st_size);
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if (percent == i->last_percent)
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return;
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if (!ratelimit_below(&i->progress_rate_limit))
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return;
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sd_notifyf(false, "X_IMPORT_PROGRESS=%u", percent);
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log_info("Imported %u%%.", percent);
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i->last_percent = percent;
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}
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static int tar_import_finish(TarImport *i) {
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int r;
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assert(i);
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assert(i->tar_fd >= 0);
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assert(i->temp_path);
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assert(i->final_path);
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i->tar_fd = safe_close(i->tar_fd);
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if (i->tar_pid > 0) {
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r = wait_for_terminate_and_check("tar", i->tar_pid, WAIT_LOG);
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i->tar_pid = 0;
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if (r < 0)
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return r;
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}
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r = import_mangle_os_tree(i->temp_path);
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if (r < 0)
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return r;
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if (i->read_only) {
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r = import_make_read_only(i->temp_path);
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if (r < 0)
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return r;
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}
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if (i->force_local)
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(void) rm_rf(i->final_path, REMOVE_ROOT|REMOVE_PHYSICAL|REMOVE_SUBVOLUME);
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r = rename_noreplace(AT_FDCWD, i->temp_path, AT_FDCWD, i->final_path);
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if (r < 0)
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return log_error_errno(r, "Failed to move image into place: %m");
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i->temp_path = mfree(i->temp_path);
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return 0;
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}
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static int tar_import_fork_tar(TarImport *i) {
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int r;
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assert(i);
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assert(!i->final_path);
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assert(!i->temp_path);
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assert(i->tar_fd < 0);
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i->final_path = strjoin(i->image_root, "/", i->local);
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if (!i->final_path)
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return log_oom();
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r = tempfn_random(i->final_path, NULL, &i->temp_path);
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if (r < 0)
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return log_oom();
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(void) mkdir_parents_label(i->temp_path, 0700);
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r = btrfs_subvol_make(i->temp_path);
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if (r == -ENOTTY) {
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if (mkdir(i->temp_path, 0755) < 0)
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return log_error_errno(errno, "Failed to create directory %s: %m", i->temp_path);
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} else if (r < 0)
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return log_error_errno(r, "Failed to create subvolume %s: %m", i->temp_path);
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else
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(void) import_assign_pool_quota_and_warn(i->temp_path);
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i->tar_fd = import_fork_tar_x(i->temp_path, &i->tar_pid);
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if (i->tar_fd < 0)
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return i->tar_fd;
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return 0;
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}
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static int tar_import_write(const void *p, size_t sz, void *userdata) {
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TarImport *i = userdata;
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int r;
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r = loop_write(i->tar_fd, p, sz, false);
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if (r < 0)
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return r;
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i->written_uncompressed += sz;
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return 0;
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}
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static int tar_import_process(TarImport *i) {
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ssize_t l;
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int r;
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assert(i);
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assert(i->buffer_size < sizeof(i->buffer));
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l = read(i->input_fd, i->buffer + i->buffer_size, sizeof(i->buffer) - i->buffer_size);
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if (l < 0) {
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if (errno == EAGAIN)
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return 0;
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r = log_error_errno(errno, "Failed to read input file: %m");
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goto finish;
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}
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if (l == 0) {
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if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
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log_error("Premature end of file.");
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r = -EIO;
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goto finish;
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}
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r = tar_import_finish(i);
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goto finish;
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}
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i->buffer_size += l;
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if (i->compress.type == IMPORT_COMPRESS_UNKNOWN) {
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r = import_uncompress_detect(&i->compress, i->buffer, i->buffer_size);
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if (r < 0) {
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log_error_errno(r, "Failed to detect file compression: %m");
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goto finish;
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}
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if (r == 0) /* Need more data */
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return 0;
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r = tar_import_fork_tar(i);
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if (r < 0)
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goto finish;
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}
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r = import_uncompress(&i->compress, i->buffer, i->buffer_size, tar_import_write, i);
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if (r < 0) {
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log_error_errno(r, "Failed to decode and write: %m");
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goto finish;
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}
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i->written_compressed += i->buffer_size;
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i->buffer_size = 0;
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tar_import_report_progress(i);
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return 0;
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finish:
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if (i->on_finished)
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i->on_finished(i, r, i->userdata);
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else
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sd_event_exit(i->event, r);
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return 0;
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}
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static int tar_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
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TarImport *i = userdata;
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return tar_import_process(i);
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}
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static int tar_import_on_defer(sd_event_source *s, void *userdata) {
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TarImport *i = userdata;
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return tar_import_process(i);
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}
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int tar_import_start(TarImport *i, int fd, const char *local, bool force_local, bool read_only) {
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int r;
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assert(i);
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assert(fd >= 0);
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assert(local);
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if (!machine_name_is_valid(local))
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return -EINVAL;
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if (i->input_fd >= 0)
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return -EBUSY;
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r = fd_nonblock(fd, true);
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if (r < 0)
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return r;
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r = free_and_strdup(&i->local, local);
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if (r < 0)
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return r;
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i->force_local = force_local;
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i->read_only = read_only;
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if (fstat(fd, &i->st) < 0)
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return -errno;
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r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, tar_import_on_input, i);
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if (r == -EPERM) {
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/* This fd does not support epoll, for example because it is a regular file. Busy read in that case */
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r = sd_event_add_defer(i->event, &i->input_event_source, tar_import_on_defer, i);
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if (r < 0)
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return r;
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r = sd_event_source_set_enabled(i->input_event_source, SD_EVENT_ON);
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}
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if (r < 0)
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return r;
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i->input_fd = fd;
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return r;
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}
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