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Fix Qemu probes for disk format and zero-byte skipping support #14272

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Fix Qemu probes for disk format and zero-byte skipping support #14272

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9966f3a
utils.qemu - use qemu-img convert-based check for --target-is-zero su…
Tristan971 Sep 25, 2026
e4e8088
utils.qemu - use create-based disk format support detection
Tristan971 Sep 25, 2026
eef39c8
Fix comments and command syntax in QemuImg.java
sureshanaparti Sep 29, 2026
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16 changes: 13 additions & 3 deletions plugins/hypervisors/kvm/src/main/java/org/apache/cloudstack/utils/qemu/QemuImg.java
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Original file line number Diff line number Diff line change
Expand Up @@ -122,8 +122,8 @@ public enum BitmapOperation {

/**
* Create a QemuImg object that supports skipping target zeroes
* We detect this support via qemu-img help since support can
* be backported rather than found in a specific version.
* We detect this support via qemu-img convert --help since support
* can be backported rather than found in a specific version.
*
* @param timeout script timeout, default 0
* @param skipZeroIfSupported Don't write zeroes to target device during convert, if supported by qemu-img
Expand All @@ -132,7 +132,7 @@ public enum BitmapOperation {
public QemuImg(final long timeout, final boolean skipZeroIfSupported, final boolean noCache) throws LibvirtException {
if (skipZeroIfSupported) {
final Script s = new Script(_qemuImgPath, timeout);
s.add("--help");
s.add("convert", "--help");

final OutputInterpreter.AllLinesParser parser = new OutputInterpreter.AllLinesParser();
final String result = s.execute(parser);
Expand Down Expand Up @@ -911,6 +911,16 @@ public void setSkipTargetVolumeCreation(boolean skipTargetVolumeCreation) {
}

public boolean supportsImageFormat(QemuImg.PhysicalDiskFormat format) {
// qemu-img create -f $format -o help
// - prints supported format options with rc=0 on known format, and
// - error message with rc=1 on unsupported format
final Script createProbe = new Script(_qemuImgPath, timeout);
createProbe.add("create", "-f", format.toString(), "-o", "help");
String createProbeResult = createProbe.execute(new OutputInterpreter.AllLinesParser());
if (createProbeResult == null) {
return true;
}

final Script s = new Script(_qemuImgPath, timeout);
s.add("--help");

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