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qemu-img: make "info" backing file output correct and easier to use

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qemu-img info should use the same logic as qemu when printing the
backing file path, or debugging becomes quite tricky.  We can also
simplify the output in case the backing file has an absolute path
or a protocol.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-05-08 16:51:50 +02:00 committed by Kevin Wolf
parent 6405875cdd
commit dc5a137125
3 changed files with 20 additions and 13 deletions
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19
block.c
View File

@ -270,6 +270,15 @@ void path_combine(char *dest, int dest_size,
}
}
void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz)
{
if (bs->backing_file[0] == '\0' || path_has_protocol(bs->backing_file)) {
pstrcpy(dest, sz, bs->backing_file);
} else {
path_combine(dest, sz, bs->filename, bs->backing_file);
}
}
void bdrv_register(BlockDriver *bdrv)
{
/* Block drivers without coroutine functions need emulation */
@ -796,14 +805,8 @@ int bdrv_open(BlockDriverState *bs, const char *filename, int flags,
BlockDriver *back_drv = NULL;
bs->backing_hd = bdrv_new("");
if (path_has_protocol(bs->backing_file)) {
pstrcpy(backing_filename, sizeof(backing_filename),
bs->backing_file);
} else {
path_combine(backing_filename, sizeof(backing_filename),
filename, bs->backing_file);
}
bdrv_get_full_backing_filename(bs, backing_filename,
sizeof(backing_filename));
if (bs->backing_format[0] != '\0') {
back_drv = bdrv_find_format(bs->backing_format);

2
block.h
View File

@ -303,6 +303,8 @@ int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi);
const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
void bdrv_get_backing_filename(BlockDriverState *bs,
char *filename, int filename_size);
void bdrv_get_full_backing_filename(BlockDriverState *bs,
char *dest, size_t sz);
int bdrv_can_snapshot(BlockDriverState *bs);
int bdrv_is_snapshot(BlockDriverState *bs);
BlockDriverState *bdrv_snapshots(void);

12
qemu-img.c
View File

@ -1138,11 +1138,13 @@ static int img_info(int argc, char **argv)
}
bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
if (backing_filename[0] != '\0') {
path_combine(backing_filename2, sizeof(backing_filename2),
filename, backing_filename);
printf("backing file: %s (actual path: %s)\n",
backing_filename,
backing_filename2);
bdrv_get_full_backing_filename(bs, backing_filename2,
sizeof(backing_filename2));
printf("backing file: %s", backing_filename);
if (strcmp(backing_filename, backing_filename2) != 0) {
printf(" (actual path: %s)", backing_filename2);
}
putchar('\n');
}
dump_snapshots(bs);
bdrv_delete(bs);