snapshot subcommand for qemu-img (Kevin Wolf)
Add snapshot subcommand to qemu-img which allows to list, create, apply
and delete snapshots on qcow2 images.
Signed-off-by: Kevin Wolf <kwolf@suse.de>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6215 c046a42c-6fe2-441c-8c8c-71466251a162
diff --git a/qemu-img.c b/qemu-img.c
index 207535f..964b28b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -22,6 +22,7 @@
* THE SOFTWARE.
*/
#include "qemu-common.h"
+#include "osdep.h"
#include "block_int.h"
#include <assert.h>
@@ -60,6 +61,7 @@
" commit [-f fmt] filename\n"
" convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] [-B output_base_image] filename [filename2 [...]] output_filename\n"
" info [-f fmt] filename\n"
+ " snapshot [-l|-a snapshot|-c snapshot|-d snapshot] filename\n"
"\n"
"Command parameters:\n"
" 'filename' is a disk image filename\n"
@@ -77,6 +79,13 @@
" '-c' indicates that target image must be compressed (qcow format only)\n"
" '-e' indicates that the target image must be encrypted (qcow format only)\n"
" '-6' indicates that the target image must use compatibility level 6 (vmdk format only)\n"
+ "\n"
+ " Parameters to snapshot subcommand:\n"
+ " 'snapshot' is the name of the snapshot to create, apply or delete\n"
+ " '-a' applies a snapshot (revert disk to saved state)\n"
+ " '-c' creates a snapshot\n"
+ " '-d' deletes a snapshot\n"
+ " '-l' lists all snapshots in the given image\n"
);
printf("\nSupported format:");
bdrv_iterate_format(format_print, NULL);
@@ -732,6 +741,116 @@
return 0;
}
+#define SNAPSHOT_LIST 1
+#define SNAPSHOT_CREATE 2
+#define SNAPSHOT_APPLY 3
+#define SNAPSHOT_DELETE 4
+
+static void img_snapshot(int argc, char **argv)
+{
+ BlockDriverState *bs;
+ QEMUSnapshotInfo sn;
+ char *filename, *snapshot_name = NULL;
+ char c;
+ int ret;
+ int action = 0;
+ qemu_timeval tv;
+
+ /* Parse commandline parameters */
+ for(;;) {
+ c = getopt(argc, argv, "la:c:d:h");
+ if (c == -1)
+ break;
+ switch(c) {
+ case 'h':
+ help();
+ return;
+ case 'l':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_LIST;
+ break;
+ case 'a':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_APPLY;
+ snapshot_name = optarg;
+ break;
+ case 'c':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_CREATE;
+ snapshot_name = optarg;
+ break;
+ case 'd':
+ if (action) {
+ help();
+ return;
+ }
+ action = SNAPSHOT_DELETE;
+ snapshot_name = optarg;
+ break;
+ }
+ }
+
+ if (optind >= argc)
+ help();
+ filename = argv[optind++];
+
+ /* Open the image */
+ bs = bdrv_new("");
+ if (!bs)
+ error("Not enough memory");
+
+ if (bdrv_open2(bs, filename, 0, NULL) < 0) {
+ error("Could not open '%s'", filename);
+ }
+
+ /* Perform the requested action */
+ switch(action) {
+ case SNAPSHOT_LIST:
+ dump_snapshots(bs);
+ break;
+
+ case SNAPSHOT_CREATE:
+ memset(&sn, 0, sizeof(sn));
+ pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
+
+ qemu_gettimeofday(&tv);
+ sn.date_sec = tv.tv_sec;
+ sn.date_nsec = tv.tv_usec * 1000;
+
+ ret = bdrv_snapshot_create(bs, &sn);
+ if (ret)
+ error("Could not create snapshot '%s': %d (%s)",
+ snapshot_name, ret, strerror(-ret));
+ break;
+
+ case SNAPSHOT_APPLY:
+ ret = bdrv_snapshot_goto(bs, snapshot_name);
+ if (ret)
+ error("Could not apply snapshot '%s': %d (%s)",
+ snapshot_name, ret, strerror(-ret));
+ break;
+
+ case SNAPSHOT_DELETE:
+ ret = bdrv_snapshot_delete(bs, snapshot_name);
+ if (ret)
+ error("Could not delete snapshot '%s': %d (%s)",
+ snapshot_name, ret, strerror(-ret));
+ break;
+ }
+
+ /* Cleanup */
+ bdrv_delete(bs);
+}
+
int main(int argc, char **argv)
{
const char *cmd;
@@ -749,6 +868,8 @@
img_convert(argc, argv);
} else if (!strcmp(cmd, "info")) {
img_info(argc, argv);
+ } else if (!strcmp(cmd, "snapshot")) {
+ img_snapshot(argc, argv);
} else {
help();
}
