qemu-img resize: Require --shrink for shrinking all image formats
QEMU 2.11 introduced the --shrink option for qemu-img resize to avoid
accidentally shrinking images (commit 4ffca8904a3). However, for
compatibility reasons, it was not enforced for raw images yet, but only
a deprecation warning was printed. This warning has existed for long
enough that we can now finally require --shrink for raw images, too, and
error out if it's not given.
Documentation already describes the state as it is after this patch.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20200710121717.28339-1-kwolf@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/qemu-img.c b/qemu-img.c
index efb6ca1..5308773 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -4004,20 +4004,12 @@
}
if (total_size < current_size && !shrink) {
+ error_report("Use the --shrink option to perform a shrink operation.");
warn_report("Shrinking an image will delete all data beyond the "
"shrunken image's end. Before performing such an "
"operation, make sure there is no important data there.");
-
- if (g_strcmp0(bdrv_get_format_name(blk_bs(blk)), "raw") != 0) {
- error_report(
- "Use the --shrink option to perform a shrink operation.");
- ret = -1;
- goto out;
- } else {
- warn_report("Using the --shrink option will suppress this message. "
- "Note that future versions of qemu-img may refuse to "
- "shrink images without this option.");
- }
+ ret = -1;
+ goto out;
}
/*
