[rocm-libraries] ROCm/rocm-libraries#5630 (commit 14cd617)

add self healing to ref repo

## Motivation

Check for when mirror repo gets corrupted in CI

## Technical Details

We detect broken ref objects and rebuild the local mirror in that case
of corruption

## Test Plan

<!-- Explain any relevant testing done to verify this PR. -->

## Test Result

<!-- Briefly summarize test outcomes. -->

## Submission Checklist

- [ ] Look over the contributing guidelines at
https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.

Jenkinsfile

@@ -62,12 +62,44 @@ def cloneUpdateRefRepo() {
     echo "rocm-libraries repo exists at ${refRepoPath}, performing git remote update..."
     echo "locking on label: ${lockLabel}"
     lock(lockLabel) {
+        // Sanity check: detect corrupt refs that would break git fetch
+        int showRefStatus = sh(
+            script: """
+                set +e
+                cd ${refRepoPath}
+                git show-ref > /dev/null 2>&1
+                echo \$? > .git/.last-show-ref-status
+            """,
+            returnStatus: true,
+            label: "pre-update ref sanity check"
+        )
+
+        def showRefExit = sh(
+            script: "cat ${refRepoPath}/.git/.last-show-ref-status || echo 1",
+            returnStdout: true
+        ).trim() as Integer
+
+        if (showRefExit != 0) {
+            echo "Ref repo at ${refRepoPath} appears corrupt (git show-ref failed). Recreating mirror clone..."
+            sh(
+                script: """
+                    set -ex
+                    rm -rf ${refRepoPath}
+                    mkdir -p ${refRepoPath}
+                    git clone --mirror https://github.com/ROCm/rocm-libraries.git ${refRepoPath}
+                """,
+                label: "reclone ref repo after corruption"
+            )
+        }
+
         def fetchCommand = """
             set -ex
             cd ${refRepoPath}
             git remote prune origin
-            git remote update
+            git remote update --prune
+            git fsck --no-progress --connectivity-only
         """
+
         sh(script: fetchCommand, label: "update ref repo")
     }
     echo "Completed git ref repo fetch, lock released"