nasbackup.sh: verify backup integrity with qemu-img check#12845
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jmsperu wants to merge 1 commit intoapache:4.20from
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nasbackup.sh: verify backup integrity with qemu-img check#12845jmsperu wants to merge 1 commit intoapache:4.20from
jmsperu wants to merge 1 commit intoapache:4.20from
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Add verify_backup() that runs qemu-img check on all qcow2 files after backup completes. Catches corrupt or truncated backup files (e.g. from NFS I/O errors or storage full) before reporting success. Applied to both running and stopped VM backup paths. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## 4.20 #12845 +/- ##
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Coverage 16.24% 16.24%
- Complexity 13411 13412 +1
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Files 5664 5664
Lines 500463 500463
Branches 60779 60779
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+ Hits 81308 81323 +15
+ Misses 410059 410051 -8
+ Partials 9096 9089 -7
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Pull request overview
This PR strengthens KVM NAS backup reliability by adding a post-backup integrity verification step (qemu-img check) so corrupted or truncated qcow2 backups are detected before the backup is reported as successful to CloudStack.
Changes:
- Added
verify_backup()to validate all*.qcow2files in the backup destination usingqemu-img check. - Invoked verification after both running-VM (push) and stopped-VM (
qemu-img convert) backup flows.
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| verify_backup() { | ||
| local backup_dir="$1" | ||
| local failed=0 | ||
| for img in "$backup_dir"/*.qcow2; do | ||
| [[ -f "$img" ]] || continue | ||
| if ! qemu-img check "$img" > /dev/null 2>&1; then | ||
| echo "Backup verification failed for $img" |
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| if ! qemu-img check "$img" > /dev/null 2>&1; then | ||
| echo "Backup verification failed for $img" | ||
| log -ne "Backup verification FAILED: $img" |
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| for img in "$backup_dir"/*.qcow2; do | ||
| [[ -f "$img" ]] || continue | ||
| if ! qemu-img check "$img" > /dev/null 2>&1; then |
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Summary
verify_backup()function that runsqemu-img checkon all qcow2 backup files after backup completesMotivation
Without verification, a backup that was silently corrupted by NFS errors or disk full conditions is reported as successful. The admin only discovers the corruption when attempting to restore — which is the worst possible time.
qemu-img checkis fast (reads metadata only, not full data) and catches structural corruption.Test plan
qemu-img checkpasses in agent log