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pve-qemu/debian/patches/pve/0029-PVE-Backup-pbs-restore...

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Dietmar Maurer <dietmar@proxmox.com>
Date: Mon, 6 Apr 2020 12:17:01 +0200
Subject: [PATCH] PVE-Backup: pbs-restore - new command to restore from proxmox
backup server
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
---
Makefile | 4 +-
pbs-restore.c | 217 ++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 220 insertions(+), 1 deletion(-)
create mode 100644 pbs-restore.c
diff --git a/Makefile b/Makefile
index aec216968d..b73da29f24 100644
--- a/Makefile
+++ b/Makefile
@@ -479,7 +479,7 @@ dummy := $(call unnest-vars,, \
include $(SRC_PATH)/tests/Makefile.include
-all: $(DOCS) $(if $(BUILD_DOCS),sphinxdocs) $(TOOLS) vma$(EXESUF) $(HELPERS-y) recurse-all modules $(vhost-user-json-y)
+all: $(DOCS) $(if $(BUILD_DOCS),sphinxdocs) $(TOOLS) vma$(EXESUF) pbs-restore$(EXESUF) $(HELPERS-y) recurse-all modules $(vhost-user-json-y)
qemu-version.h: FORCE
$(call quiet-command, \
@@ -604,6 +604,8 @@ qemu-io$(EXESUF): qemu-io.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-o
qemu-storage-daemon$(EXESUF): qemu-storage-daemon.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(chardev-obj-y) $(io-obj-y) $(qom-obj-y) $(storage-daemon-obj-y) $(COMMON_LDADDS)
qemu-storage-daemon$(EXESUF): LIBS += -lproxmox_backup_qemu
vma$(EXESUF): vma.o vma-reader.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
+pbs-restore$(EXESUF): pbs-restore.o $(authz-obj-y) $(block-obj-y) $(crypto-obj-y) $(io-obj-y) $(qom-obj-y) $(COMMON_LDADDS)
+pbs-restore$(EXESUF): LIBS += -lproxmox_backup_qemu
qemu-bridge-helper$(EXESUF): qemu-bridge-helper.o $(COMMON_LDADDS)
diff --git a/pbs-restore.c b/pbs-restore.c
new file mode 100644
index 0000000000..4bf37ef1fa
--- /dev/null
+++ b/pbs-restore.c
@@ -0,0 +1,217 @@
+/*
+ * Qemu image restore helper for Proxmox Backup
+ *
+ * Copyright (C) 2019 Proxmox Server Solutions
+ *
+ * Authors:
+ * Dietmar Maurer (dietmar@proxmox.com)
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include <glib.h>
+#include <getopt.h>
+#include <string.h>
+
+#include "qemu-common.h"
+#include "qemu/module.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
+#include "qemu/cutils.h"
+#include "qapi/error.h"
+#include "qapi/qmp/qdict.h"
+#include "sysemu/block-backend.h"
+
+#include <proxmox-backup-qemu.h>
+
+static void help(void)
+{
+ const char *help_msg =
+ "usage: pbs-restore [--repository <repo>] snapshot archive-name target [command options]\n"
+ ;
+
+ printf("%s", help_msg);
+ exit(1);
+}
+
+typedef struct CallbackData {
+ BlockBackend *target;
+ uint64_t last_offset;
+ bool skip_zero;
+} CallbackData;
+
+static int write_callback(
+ void *callback_data_ptr,
+ uint64_t offset,
+ const unsigned char *data,
+ uint64_t data_len)
+{
+ int res = -1;
+
+ CallbackData *callback_data = (CallbackData *)callback_data_ptr;
+
+ uint64_t last_offset = callback_data->last_offset;
+ if (offset > last_offset) callback_data->last_offset = offset;
+
+ if (data == NULL) {
+ if (callback_data->skip_zero && offset > last_offset) {
+ return 0;
+ }
+ res = blk_pwrite_zeroes(callback_data->target, offset, data_len, 0);
+ } else {
+ res = blk_pwrite(callback_data->target, offset, data, data_len, 0);
+ }
+
+ if (res < 0) {
+ fprintf(stderr, "blk_pwrite failed at offset %ld length %ld (%d) - %s\n", offset, data_len, res, strerror(-res));
+ return res;
+ }
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ Error *main_loop_err = NULL;
+ const char *format = "raw";
+ const char *repository = NULL;
+ const char *keyfile = NULL;
+ int verbose = false;
+ bool skip_zero = false;
+
+ error_init(argv[0]);
+
+ for (;;) {
+ static const struct option long_options[] = {
+ {"help", no_argument, 0, 'h'},
+ {"skip-zero", no_argument, 0, 'S'},
+ {"verbose", no_argument, 0, 'v'},
+ {"format", required_argument, 0, 'f'},
+ {"repository", required_argument, 0, 'r'},
+ {"keyfile", required_argument, 0, 'k'},
+ {0, 0, 0, 0}
+ };
+ int c = getopt_long(argc, argv, "hvf:r:k:", long_options, NULL);
+ if (c == -1) {
+ break;
+ }
+ switch (c) {
+ case ':':
+ fprintf(stderr, "missing argument for option '%s'\n", argv[optind - 1]);
+ return -1;
+ case '?':
+ fprintf(stderr, "unrecognized option '%s'\n", argv[optind - 1]);
+ return -1;
+ case 'f':
+ format = g_strdup(argv[optind - 1]);
+ break;
+ case 'r':
+ repository = g_strdup(argv[optind - 1]);
+ break;
+ case 'k':
+ keyfile = g_strdup(argv[optind - 1]);
+ break;
+ case 'v':
+ verbose = true;
+ break;
+ case 'S':
+ skip_zero = true;
+ break;
+ case 'h':
+ help();
+ return 0;
+ }
+ }
+
+ if (optind >= argc - 2) {
+ fprintf(stderr, "missing arguments\n");
+ help();
+ return -1;
+ }
+
+ if (repository == NULL) {
+ repository = getenv("PBS_REPOSITORY");
+ }
+
+ if (repository == NULL) {
+ fprintf(stderr, "no repository specified\n");
+ help();
+ return -1;
+ }
+
+ char *snapshot = argv[optind++];
+ char *archive_name = argv[optind++];
+ char *target = argv[optind++];
+
+ const char *password = getenv("PBS_PASSWORD");
+ const char *fingerprint = getenv("PBS_FINGERPRINT");
+ const char *key_password = getenv("PBS_ENCRYPTION_PASSWORD");
+
+ if (qemu_init_main_loop(&main_loop_err)) {
+ g_error("%s", error_get_pretty(main_loop_err));
+ }
+
+ bdrv_init();
+ module_call_init(MODULE_INIT_QOM);
+
+ if (verbose) {
+ fprintf(stderr, "connecting to repository '%s'\n", repository);
+ }
+ char *pbs_error = NULL;
+ ProxmoxRestoreHandle *conn = proxmox_restore_connect(
+ repository, snapshot, password, keyfile, key_password, fingerprint, &pbs_error);
+ if (conn == NULL) {
+ fprintf(stderr, "restore failed: %s\n", pbs_error);
+ return -1;
+ }
+
+ QDict *options = qdict_new();
+
+ if (format) {
+ qdict_put_str(options, "driver", format);
+ }
+
+
+ if (verbose) {
+ fprintf(stderr, "open block backend for target '%s'\n", target);
+ }
+ Error *local_err = NULL;
+ int flags = BDRV_O_RDWR;
+ BlockBackend *blk = blk_new_open(target, NULL, options, flags, &local_err);
+ if (!blk) {
+ fprintf(stderr, "%s\n", error_get_pretty(local_err));
+ return -1;
+ }
+
+ CallbackData *callback_data = calloc(sizeof(CallbackData), 1);
+
+ callback_data->target = blk;
+ callback_data->skip_zero = skip_zero;
+ callback_data->last_offset = 0;
+
+ // blk_set_enable_write_cache(blk, !writethrough);
+
+ if (verbose) {
+ fprintf(stderr, "starting to restore snapshot '%s'\n", snapshot);
+ fflush(stderr); // ensure we do not get printed after the progress log
+ }
+ int res = proxmox_restore_image(
+ conn,
+ archive_name,
+ write_callback,
+ callback_data,
+ &pbs_error,
+ verbose);
+
+ proxmox_restore_disconnect(conn);
+
+ if (res < 0) {
+ fprintf(stderr, "restore failed: %s\n", pbs_error);
+ return -1;
+ }
+
+ return 0;
+}
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