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storage: rework qemu-img command line generation

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Split out option string generation to make adding new options easier
and simplify the code.
This commit is contained in:
Ján Tomko 2013-05-13 10:16:52 +02:00
parent d0d0413e48
commit 53d5967c25
1 changed files with 60 additions and 53 deletions
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109
src/storage/storage_backend.c
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@ -629,6 +629,32 @@ cleanup:
return ret;
}
static int
virStorageBackendCreateQemuImgOpts(char **opts,
const char *backingType,
bool encryption,
bool preallocate)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (backingType)
virBufferAsprintf(&buf, "backing_fmt=%s,", backingType);
if (encryption)
virBufferAddLit(&buf, "encryption=on,");
if (preallocate)
virBufferAddLit(&buf, "preallocation=metadata,");
virBufferTrim(&buf, ",", -1);
if (virBufferError(&buf)) {
virBufferFreeAndReset(&buf);
virReportOOMError();
return -1;
}
*opts = virBufferContentAndReset(&buf);
return 0;
}
virCommandPtr
virStorageBackendCreateQemuImgCmd(virConnectPtr conn,
virStoragePoolObjPtr pool,
@ -646,6 +672,9 @@ virStorageBackendCreateQemuImgCmd(virConnectPtr conn,
const char *backingType = NULL;
const char *inputPath = NULL;
const char *inputType = NULL;
char *opts = NULL;
bool convert = false;
bool backing = false;
virCheckFlags(VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA, NULL);
@ -773,64 +802,42 @@ virStorageBackendCreateQemuImgCmd(virConnectPtr conn,
cmd = virCommandNew(create_tool);
if (inputvol) {
convert = !!inputvol;
backing = !inputvol && vol->backingStore.path;
if (convert)
virCommandAddArgList(cmd, "convert", "-f", inputType, "-O", type, NULL);
if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS &&
(do_encryption || preallocate)) {
virCommandAddArg(cmd, "-o");
virCommandAddArgFormat(cmd, "%s%s%s", do_encryption ? "encryption=on" : "",
(do_encryption && preallocate) ? "," : "",
preallocate ? "preallocation=metadata" : "");
} else if (do_encryption) {
virCommandAddArg(cmd, "-e");
}
virCommandAddArgList(cmd, inputPath, vol->target.path, NULL);
} else if (vol->backingStore.path) {
virCommandAddArgList(cmd, "create", "-f", type,
"-b", vol->backingStore.path, NULL);
switch (imgformat) {
case QEMU_IMG_BACKING_FORMAT_FLAG:
virCommandAddArgList(cmd, "-F", backingType, NULL);
if (do_encryption)
virCommandAddArg(cmd, "-e");
virCommandAddArg(cmd, vol->target.path);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
break;
case QEMU_IMG_BACKING_FORMAT_OPTIONS:
virCommandAddArg(cmd, "-o");
virCommandAddArgFormat(cmd, "backing_fmt=%s%s", backingType,
do_encryption ? ",encryption=on" : "");
virCommandAddArg(cmd, vol->target.path);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
break;
default:
VIR_DEBUG("Unable to set backing store format for %s with %s",
vol->target.path, create_tool);
if (do_encryption)
virCommandAddArg(cmd, "-e");
virCommandAddArg(cmd, vol->target.path);
virCommandAddArgFormat(cmd, "%lluK", size_arg);
}
} else {
else
virCommandAddArgList(cmd, "create", "-f", type, NULL);
if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS &&
(do_encryption || preallocate)) {
virCommandAddArg(cmd, "-o");
virCommandAddArgFormat(cmd, "%s%s%s", do_encryption ? "encryption=on" : "",
(do_encryption && preallocate) ? "," : "",
preallocate ? "preallocation=metadata" : "");
} else if (do_encryption) {
if (backing)
virCommandAddArgList(cmd, "-b", vol->backingStore.path, NULL);
if (imgformat == QEMU_IMG_BACKING_FORMAT_OPTIONS) {
if (virStorageBackendCreateQemuImgOpts(&opts,
backing ? backingType : NULL,
do_encryption, preallocate) < 0)
return NULL;
if (opts)
virCommandAddArgList(cmd, "-o", opts, NULL);
VIR_FREE(opts);
} else {
if (backing) {
if (imgformat == QEMU_IMG_BACKING_FORMAT_FLAG)
virCommandAddArgList(cmd, "-F", backingType, NULL);
else
VIR_DEBUG("Unable to set backing store format for %s with %s",
vol->target.path, create_tool);
}
if (do_encryption)
virCommandAddArg(cmd, "-e");
}
if (convert)
virCommandAddArg(cmd, inputPath);
virCommandAddArg(cmd, vol->target.path);
if (!convert)
virCommandAddArgFormat(cmd, "%lluK", size_arg);
}
return cmd;
}