Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 529 insertions, 0 deletions

diff --git a/src/import/import-raw.c b/src/import/import-raw.c
new file mode 100644
index 0000000..f7ed163
--- /dev/null
+++ b/src/import/import-raw.c
@@ -0,0 +1,529 @@
+/* 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 "format-util.h"
+#include "fs-util.h"
+#include "hostname-util.h"
+#include "import-common.h"
+#include "import-compress.h"
+#include "import-raw.h"
+#include "install-file.h"
+#include "io-util.h"
+#include "machine-pool.h"
+#include "mkdir-label.h"
+#include "path-util.h"
+#include "qcow2-util.h"
+#include "ratelimit.h"
+#include "rm-rf.h"
+#include "string-util.h"
+#include "tmpfile-util.h"
+
+struct RawImport {
+        sd_event *event;
+
+        char *image_root;
+
+        RawImportFinished on_finished;
+        void *userdata;
+
+        char *local;
+        ImportFlags flags;
+
+        char *temp_path;
+        char *final_path;
+
+        int input_fd;
+        int output_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;
+        struct stat output_stat;
+
+        unsigned last_percent;
+        RateLimit progress_ratelimit;
+
+        uint64_t offset;
+        uint64_t size_max;
+};
+
+RawImport* raw_import_unref(RawImport *i) {
+        if (!i)
+                return NULL;
+
+        sd_event_source_unref(i->input_event_source);
+
+        unlink_and_free(i->temp_path);
+
+        import_compress_free(&i->compress);
+
+        sd_event_unref(i->event);
+
+        safe_close(i->output_fd);
+
+        free(i->final_path);
+        free(i->image_root);
+        free(i->local);
+        return mfree(i);
+}
+
+int raw_import_new(
+                RawImport **ret,
+                sd_event *event,
+                const char *image_root,
+                RawImportFinished on_finished,
+                void *userdata) {
+
+        _cleanup_(raw_import_unrefp) RawImport *i = NULL;
+        _cleanup_free_ char *root = NULL;
+        int r;
+
+        assert(ret);
+
+        root = strdup(image_root ?: "/var/lib/machines");
+        if (!root)
+                return -ENOMEM;
+
+        i = new(RawImport, 1);
+        if (!i)
+                return -ENOMEM;
+
+        *i = (RawImport) {
+                .input_fd = -EBADF,
+                .output_fd = -EBADF,
+                .on_finished = on_finished,
+                .userdata = userdata,
+                .last_percent = UINT_MAX,
+                .image_root = TAKE_PTR(root),
+                .progress_ratelimit = { 100 * USEC_PER_MSEC, 1 },
+                .offset = UINT64_MAX,
+                .size_max = UINT64_MAX,
+        };
+
+        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 raw_import_report_progress(RawImport *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 raw_import_maybe_convert_qcow2(RawImport *i) {
+        _cleanup_close_ int converted_fd = -EBADF;
+        _cleanup_(unlink_and_freep) char *t = NULL;
+        _cleanup_free_ char *f = NULL;
+        int r;
+
+        assert(i);
+
+        /* Do QCOW2 conversion if enabled and not in direct mode */
+        if ((i->flags & (IMPORT_CONVERT_QCOW2|IMPORT_DIRECT)) != IMPORT_CONVERT_QCOW2)
+                return 0;
+
+        assert(i->final_path);
+
+        r = qcow2_detect(i->output_fd);
+        if (r < 0)
+                return log_error_errno(r, "Failed to detect whether this is a QCOW2 image: %m");
+        if (r == 0)
+                return 0;
+
+        /* This is a QCOW2 image, let's convert it */
+        r = tempfn_random(i->final_path, NULL, &f);
+        if (r < 0)
+                return log_oom();
+
+        converted_fd = open(f, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+        if (converted_fd < 0)
+                return log_error_errno(errno, "Failed to create %s: %m", f);
+
+        t = TAKE_PTR(f);
+
+        (void) import_set_nocow_and_log(converted_fd, t);
+
+        log_info("Unpacking QCOW2 file.");
+
+        r = qcow2_convert(i->output_fd, converted_fd);
+        if (r < 0)
+                return log_error_errno(r, "Failed to convert qcow2 image: %m");
+
+        unlink_and_free(i->temp_path);
+        i->temp_path = TAKE_PTR(t);
+        close_and_replace(i->output_fd, converted_fd);
+
+        return 1;
+}
+
+static int raw_import_finish(RawImport *i) {
+        int r;
+
+        assert(i);
+        assert(i->output_fd >= 0);
+
+        /* Nothing of what is below applies to block devices */
+        if (S_ISBLK(i->output_stat.st_mode)) {
+
+                if (i->flags & IMPORT_SYNC) {
+                        if (fsync(i->output_fd) < 0)
+                                return log_error_errno(errno, "Failed to synchronize block device: %m");
+                }
+
+                return 0;
+        }
+
+        assert(S_ISREG(i->output_stat.st_mode));
+
+        /* If an offset is specified we only are supposed to affect part of an existing output file or block
+         * device, thus don't manipulate file properties in that case */
+
+        if (i->offset == UINT64_MAX) {
+                /* In case this was a sparse file, make sure the file size is right */
+                if (i->written_uncompressed > 0) {
+                        if (ftruncate(i->output_fd, i->written_uncompressed) < 0)
+                                return log_error_errno(errno, "Failed to truncate file: %m");
+                }
+
+                r = raw_import_maybe_convert_qcow2(i);
+                if (r < 0)
+                        return r;
+
+                if (S_ISREG(i->input_stat.st_mode)) {
+                        (void) copy_times(i->input_fd, i->output_fd, COPY_CRTIME);
+                        (void) copy_xattr(i->input_fd, NULL, i->output_fd, NULL, 0);
+                }
+        }
+
+        r = install_file(AT_FDCWD, i->temp_path ?: i->local,
+                         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_FSYNC_FULL : 0));
+        if (r < 0)
+                return log_error_errno(r, "Failed to move image into place: %m");
+
+        i->temp_path = mfree(i->temp_path);
+
+        log_info("Wrote %s.", FORMAT_BYTES(i->written_uncompressed));
+
+        return 0;
+}
+
+static int raw_import_open_disk(RawImport *i) {
+        int r;
+
+        assert(i);
+        assert(i->local);
+        assert(!i->final_path);
+        assert(!i->temp_path);
+        assert(i->output_fd < 0);
+
+        if (i->flags & IMPORT_DIRECT) {
+                (void) mkdir_parents_label(i->local, 0700);
+
+                /* In direct mode we just open/create the local path and truncate it (like shell >
+                 * redirection would do it) — except if an offset was passed, in which case we are supposed
+                 * to operate on a section of the file only, in which case we apparently work on an some
+                 * existing thing (i.e. are not the sole thing stored in the file), in which case we will
+                 * neither truncate nor create. */
+
+                i->output_fd = open(i->local, O_RDWR|O_NOCTTY|O_CLOEXEC|(i->offset == UINT64_MAX ? O_TRUNC|O_CREAT : 0), 0664);
+                if (i->output_fd < 0)
+                        return log_error_errno(errno, "Failed to open destination '%s': %m", i->local);
+
+                if (i->offset == UINT64_MAX)
+                        (void) import_set_nocow_and_log(i->output_fd, i->local);
+        } else {
+                i->final_path = strjoin(i->image_root, "/", i->local, ".raw");
+                if (!i->final_path)
+                        return log_oom();
+
+                r = tempfn_random(i->final_path, NULL, &i->temp_path);
+                if (r < 0)
+                        return log_oom();
+
+                (void) mkdir_parents_label(i->temp_path, 0700);
+
+                i->output_fd = open(i->temp_path, O_RDWR|O_CREAT|O_EXCL|O_NOCTTY|O_CLOEXEC, 0664);
+                if (i->output_fd < 0)
+                        return log_error_errno(errno, "Failed to open destination '%s': %m", i->temp_path);
+
+                (void) import_set_nocow_and_log(i->output_fd, i->temp_path);
+        }
+
+        if (fstat(i->output_fd, &i->output_stat) < 0)
+                return log_error_errno(errno, "Failed to stat() output file: %m");
+
+        if (!S_ISREG(i->output_stat.st_mode) && !S_ISBLK(i->output_stat.st_mode))
+                return log_error_errno(SYNTHETIC_ERRNO(EBADFD),
+                                       "Target file is not a regular file or block device");
+
+        if (i->offset != UINT64_MAX) {
+                if (lseek(i->output_fd, i->offset, SEEK_SET) < 0)
+                        return log_error_errno(errno, "Failed to seek to offset: %m");
+        }
+
+        return 0;
+}
+
+static int raw_import_try_reflink(RawImport *i) {
+        off_t p;
+        int r;
+
+        assert(i);
+        assert(i->input_fd >= 0);
+        assert(i->output_fd >= 0);
+
+        if (i->compress.type != IMPORT_COMPRESS_UNCOMPRESSED)
+                return 0;
+
+        if (i->offset != UINT64_MAX || i->size_max != UINT64_MAX)
+                return 0;
+
+        if (!S_ISREG(i->input_stat.st_mode) || !S_ISREG(i->output_stat.st_mode))
+                return 0;
+
+        p = lseek(i->input_fd, 0, SEEK_CUR);
+        if (p < 0)
+                return log_error_errno(errno, "Failed to read file offset of input file: %m");
+
+        /* Let's only try a btrfs reflink, if we are reading from the beginning of the file */
+        if ((uint64_t) p != (uint64_t) i->buffer_size)
+                return 0;
+
+        r = reflink(i->input_fd, i->output_fd);
+        if (r >= 0)
+                return 1;
+
+        log_debug_errno(r, "Couldn't establish reflink, using copy: %m");
+        return 0;
+}
+
+static int raw_import_write(const void *p, size_t sz, void *userdata) {
+        RawImport *i = ASSERT_PTR(userdata);
+        bool too_much = false;
+        int r;
+
+        assert(p);
+        assert(sz > 0);
+
+        if (i->written_uncompressed >= UINT64_MAX - sz)
+                return log_error_errno(SYNTHETIC_ERRNO(EOVERFLOW), "File too large, overflow");
+
+        if (i->size_max != UINT64_MAX) {
+                if (i->written_uncompressed >= i->size_max) {
+                        too_much = true;
+                        goto finish;
+                }
+
+                if (i->written_uncompressed + sz > i->size_max) {
+                        too_much = true;
+                        sz = i->size_max - i->written_uncompressed; /* since we have the data in memory
+                                                                     * already, we might as well write it to
+                                                                     * disk to the max */
+                }
+        }
+
+        /* Generate sparse file if we created/truncated the file */
+        if (S_ISREG(i->output_stat.st_mode) && i->offset == UINT64_MAX) {
+                ssize_t n;
+
+                n = sparse_write(i->output_fd, p, sz, 64);
+                if (n < 0)
+                        return log_error_errno((int) n, "Failed to write file: %m");
+                if ((size_t) n < sz)
+                        return log_error_errno(SYNTHETIC_ERRNO(EIO), "Short write");
+        } else {
+                r = loop_write(i->output_fd, p, sz);
+                if (r < 0)
+                        return log_error_errno(r, "Failed to write file: %m");
+        }
+
+        i->written_uncompressed += sz;
+
+finish:
+        if (too_much)
+                return log_error_errno(SYNTHETIC_ERRNO(E2BIG), "File too large");
+
+        return 0;
+}
+
+static int raw_import_process(RawImport *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 = raw_import_open_disk(i);
+                if (r < 0)
+                        goto finish;
+
+                r = raw_import_try_reflink(i);
+                if (r < 0)
+                        goto finish;
+                if (r > 0)
+                        goto complete;
+        }
+
+        r = import_uncompress(&i->compress, i->buffer, i->buffer_size, raw_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 */
+                goto complete;
+
+        raw_import_report_progress(i);
+
+        return 0;
+
+complete:
+        r = raw_import_finish(i);
+
+finish:
+        if (i->on_finished)
+                i->on_finished(i, r, i->userdata);
+        else
+                sd_event_exit(i->event, r);
+
+        return 0;
+}
+
+static int raw_import_on_input(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
+        RawImport *i = userdata;
+
+        return raw_import_process(i);
+}
+
+static int raw_import_on_defer(sd_event_source *s, void *userdata) {
+        RawImport *i = userdata;
+
+        return raw_import_process(i);
+}
+
+int raw_import_start(
+                RawImport *i,
+                int fd,
+                const char *local,
+                uint64_t offset,
+                uint64_t size_max,
+                ImportFlags flags) {
+        int r;
+
+        assert(i);
+        assert(fd >= 0);
+        assert(local);
+        assert(!(flags & ~IMPORT_FLAGS_MASK_RAW));
+        assert(offset == UINT64_MAX || FLAGS_SET(flags, IMPORT_DIRECT));
+
+        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;
+        i->offset = offset;
+        i->size_max = size_max;
+
+        if (fstat(fd, &i->input_stat) < 0)
+                return -errno;
+
+        r = sd_event_add_io(i->event, &i->input_event_source, fd, EPOLLIN, raw_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, raw_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;
+}