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lib: Autodetect backing format for qemu-img create -b

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qemu 6.1 has decided to change qemu-img create so that a backing
format (-F) is required if a backing file (-b) is specified.  Since we
don't want to change the libguestfs API to force callers to specify
this because that would be an API break, autodetect it.

This is similar to commit c8c181e8d9 ("launch: libvirt: Autodetect
backing format for readonly drive overlays").

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1998820
This commit is contained in:
Richard W.M. Jones
2021-08-31 08:27:15 +01:00
parent 210959cc34
commit 45de287447
1 changed files with 9 additions and 0 deletions
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9
lib/create.c
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@@ -255,6 +255,7 @@ disk_create_qcow2 (guestfs_h *g, const char *filename, int64_t size,
const struct guestfs_disk_create_argv *optargs)
{
const char *backingformat = NULL;
CLEANUP_FREE char *backingformat_free = NULL;
const char *preallocation = NULL;
const char *compat = NULL;
int clustersize = -1;
@@ -270,6 +271,14 @@ disk_create_qcow2 (guestfs_h *g, const char *filename, int64_t size,
return -1;
}
}
else if (backingfile) {
/* Since qemu 6.1, qemu-img create has requires a backing format (-F)
* parameter if backing file (-b) is used (RHBZ#1998820).
*/
backingformat = backingformat_free = guestfs_disk_format (g, backingfile);
if (!backingformat)
return -1;
}
if (optargs->bitmask & GUESTFS_DISK_CREATE_PREALLOCATION_BITMASK) {
if (STREQ (optargs->preallocation, "off") ||
STREQ (optargs->preallocation, "sparse"))