nasbackup: fix backup stopped vm on Ubuntu 26.04 by weizhouapache · Pull Request #13643 · apache/cloudstack

weizhouapache · 2026-07-17T12:55:33Z

backing up stopped vm failed on Ubuntu 26.04 failed with error

2026-07-17 09:47:56,636 DEBUG [resource.wrapper.LibvirtTakeBackupCommandWrapper] (AgentRequest-Handler-4:[]) (logid:fd553fbe) Wei Parsing backup size line: Jul
2026-07-17 09:47:56,636 WARN  [cloud.agent.Agent] (AgentRequest-Handler-4:[]) (logid:fd553fbe) Caught: java.lang.NumberFormatException: For input string: "Jul"
        at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67)
        at java.base/java.lang.Long.parseLong(Long.java:711)
        at java.base/java.lang.Long.parseLong(Long.java:836)
        at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtTakeBackupCommandWrapper.parseBackupSize(LibvirtTakeBackupCommandWrapper.java:230)
        at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtTakeBackupCommandWrapper.execute(LibvirtTakeBackupCommandWrapper.java:111)
        at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtTakeBackupCommandWrapper.execute(LibvirtTakeBackupCommandWrapper.java:42)
        at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRequestWrapper.execute(LibvirtRequestWrapper.java:78)
        at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:2407)

it is due to different format of "ls -l" command:

kvm1:~# ls -l /tmp/csbackup.2CsWP/i-2-582-VM/2026.07.17.09.47.45/
total 1475240
-rw-r--r--+1 root root 1510539264 Jul 17 10:07 root.49d59058-90ce-4fba-bee6-da6d626065dd.qcow2

kvm1:~# ls -l --numeric-uid-gid /tmp/csbackup.2CsWP/i-2-582-VM/2026.07.17.09.47.45/ | awk '{print $5}'

Jul

kvm1:~# find /tmp/csbackup.2CsWP/i-2-582-VM/2026.07.17.09.47.45/ -type f -exec stat -c '%s' {} +
1510539264

Description

This PR...

Types of changes

Breaking change (fix or feature that would cause existing functionality to change)
New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)
Enhancement (improves an existing feature and functionality)
Cleanup (Code refactoring and cleanup, that may add test cases)
Build/CI
Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

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Major
Minor

Bug Severity

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

backing up stopped vm failed on Ubuntu 26.04 failed with error ``` 2026-07-17 09:47:56,636 DEBUG [resource.wrapper.LibvirtTakeBackupCommandWrapper] (AgentRequest-Handler-4:[]) (logid:fd553fbe) Wei Parsing backup size line: Jul 2026-07-17 09:47:56,636 WARN [cloud.agent.Agent] (AgentRequest-Handler-4:[]) (logid:fd553fbe) Caught: java.lang.NumberFormatException: For input string: "Jul" at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:67) at java.base/java.lang.Long.parseLong(Long.java:711) at java.base/java.lang.Long.parseLong(Long.java:836) at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtTakeBackupCommandWrapper.parseBackupSize(LibvirtTakeBackupCommandWrapper.java:230) at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtTakeBackupCommandWrapper.execute(LibvirtTakeBackupCommandWrapper.java:111) at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtTakeBackupCommandWrapper.execute(LibvirtTakeBackupCommandWrapper.java:42) at com.cloud.hypervisor.kvm.resource.wrapper.LibvirtRequestWrapper.execute(LibvirtRequestWrapper.java:78) at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:2407) ``` it is due to different format of "ls -l" command: ``` kvm1:~# ls -l /tmp/csbackup.2CsWP/i-2-582-VM/2026.07.17.09.47.45/ total 1475240 -rw-r--r--+1 root root 1510539264 Jul 17 10:07 root.49d59058-90ce-4fba-bee6-da6d626065dd.qcow2 kvm1:~# ls -l --numeric-uid-gid /tmp/csbackup.2CsWP/i-2-582-VM/2026.07.17.09.47.45/ | awk '{print $5}' Jul kvm1:~# find /tmp/csbackup.2CsWP/i-2-582-VM/2026.07.17.09.47.45/ -type f -exec stat -c '%s' {} + 1510539264 ```

weizhouapache · 2026-07-17T12:56:13Z

@blueorangutan package

blueorangutan · 2026-07-17T12:58:04Z

@weizhouapache a [SL] Jenkins job has been kicked to build packages. It will be bundled with no SystemVM templates. I'll keep you posted as I make progress.

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Pull request overview

Fixes NAS backup of stopped KVM VMs on Ubuntu 26.04 by avoiding ls -l output parsing (which can shift fields) when reporting backup size back to the management server.

Changes:

Replace ls -l --numeric-uid-gid ... | awk '{print $5}' with find ... -exec stat -c '%s' ... to emit byte sizes reliably for the produced backup files.

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codecov · 2026-07-17T13:03:36Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 19.64%. Comparing base (75748a5) to head (7c2b919).

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #13643      +/-   ##
============================================
- Coverage     19.65%   19.64%   -0.01%     
+ Complexity    19792    19785       -7     
============================================
  Files          6368     6368              
  Lines        575107   575107              
  Branches      70370    70370              
============================================
- Hits         113016   112986      -30     
- Misses       449808   449836      +28     
- Partials      12283    12285       +2

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blueorangutan · 2026-07-17T13:41:45Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 18604

weizhouapache · 2026-07-17T13:52:14Z

@blueorangutan test ubuntu26 kvm-ubuntu26

blueorangutan · 2026-07-17T13:54:04Z

@weizhouapache a [SL] Trillian-Jenkins test job (ubuntu26 mgmt + kvm-ubuntu26) has been kicked to run smoke tests

weizhouapache · 2026-07-17T14:17:36Z

@blueorangutan test ubuntu24 kvm-ubuntu24

blueorangutan · 2026-07-17T14:18:05Z

@weizhouapache a [SL] Trillian-Jenkins test job (ubuntu24 mgmt + kvm-ubuntu24) has been kicked to run smoke tests

winterhazel

~~Assuming that the file output order does not matter, it looks good (did not test).~~

fabricio@pc:~/github/cloudstack$ ls -l --numeric-uid-gid $dest | awk '{print $5}'

4978
9819
13674
205830
4954

fabricio@pc:~/github/cloudstack$ find "$dest" -type f -exec stat -c '%s' {} +
4954
9819
4978
205830
13674

Edit: I had a look at the code that parses this output. It seems to assume that the volume's size will be on the last line when backing up a single volume?

private long parseBackupSize(String stdout, List<String> diskPaths) {
        long backupSize = 0L;
        if (CollectionUtils.isNullOrEmpty(diskPaths)) {
            List<String> outputLines = Arrays.asList(stdout.split("\n"));
            if (!outputLines.isEmpty()) {
                backupSize = Long.parseLong(outputLines.get(outputLines.size() - 1).trim());
            }
        } else {
            for (String line : stdout.split("\n")) {
                backupSize = backupSize + Long.parseLong(line.split(" ")[0].trim());
            }
        }
        return backupSize;
    }

@weizhouapache could you check if this output order change may cause a regression?

weizhouapache · 2026-07-17T15:53:29Z

~~Assuming that the file output order does not matter, it looks good (did not test).~~

fabricio@pc:~/github/cloudstack$ ls -l --numeric-uid-gid $dest | awk '{print $5}'

4978
9819
13674
205830
4954

fabricio@pc:~/github/cloudstack$ find "$dest" -type f -exec stat -c '%s' {} +
4954
9819
4978
205830
13674

Edit: I had a look at the code that parses this output. It seems to assume that the volume's size will be on the last line when backing up a single volume?

private long parseBackupSize(String stdout, List<String> diskPaths) {
        long backupSize = 0L;
        if (CollectionUtils.isNullOrEmpty(diskPaths)) {
            List<String> outputLines = Arrays.asList(stdout.split("\n"));
            if (!outputLines.isEmpty()) {
                backupSize = Long.parseLong(outputLines.get(outputLines.size() - 1).trim());
            }
        } else {
            for (String line : stdout.split("\n")) {
                backupSize = backupSize + Long.parseLong(line.split(" ")[0].trim());
            }
        }
        return backupSize;
    }

@weizhouapache could you check if this output order change may cause a regression?

Thanks @winterhazel for checking
In my testing, the directory has only 1 qcow2 file. I will double check when possible (I will on leave next week)

blueorangutan · 2026-07-18T06:01:36Z

[SF] Trillian test result (tid-8)
Environment: kvm-ubuntu26 (x2), zone: Advanced Networking with Mgmt server u26
Total time taken: 55415 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr13643-n8-kvm-ubuntu26.zip
Smoke tests completed. 156 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

blueorangutan · 2026-07-18T07:14:51Z

[SF] Trillian test result (tid-16585)
Environment: kvm-ubuntu24 (x2), zone: Advanced Networking with Mgmt server u24
Total time taken: 58370 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr13643-t16585-kvm-ubuntu24.zip
Smoke tests completed. 156 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

Copilot AI review requested due to automatic review settings July 17, 2026 12:55

boring-cyborg Bot added the component:kvm label Jul 17, 2026

Copilot started reviewing on behalf of weizhouapache July 17, 2026 12:56 View session

Copilot AI reviewed Jul 17, 2026

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weizhouapache added this to the 4.23.0 milestone Jul 17, 2026

winterhazel approved these changes Jul 17, 2026

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winterhazel self-requested a review July 17, 2026 15:48

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weizhouapache commented Jul 17, 2026

Description

Types of changes

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

Bug Severity

Screenshots (if appropriate):

How Has This Been Tested?

How did you try to break this feature and the system with this change?

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weizhouapache commented Jul 17, 2026

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