[llvm] [CI] Save sccache logs (PR #155444)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-github-workflow

Author: Aiden Grossman (boomanaiden154)

<details>
<summary>Changes</summary>

This patch saves the sccache logs to the artifacts. If sccache dies and the server prints logs, we currently do not collect them anywhere and they do not get dumped to STDOUT/STDERR. If the process is directly getting killed (SIGTERM), it seems like it doesn't dump anything, but in most other cases we should be able to see something.

Related to #<!-- -->155442.

---
Full diff: https://github.com/llvm/llvm-project/pull/155444.diff


1 Files Affected:

- (modified) .github/workflows/premerge.yaml (+2-2) 


``````````diff
diff --git a/.github/workflows/premerge.yaml b/.github/workflows/premerge.yaml
index 9d925517a7211..2b43f462dc140 100644
--- a/.github/workflows/premerge.yaml
+++ b/.github/workflows/premerge.yaml
@@ -65,7 +65,7 @@ jobs:
           # several test suites in a row and discard statistics that we want
           # to save in the end.
           export SCCACHE_IDLE_TIMEOUT=0
-          sccache --start-server
+          SCCACHE_LOG=info SCCACHE_ERROR_LOG=artifacts/sccache.log sccache --start-server
 
           ./.ci/monolithic-linux.sh "${projects_to_build}" "${project_check_targets}" "${runtimes_to_build}" "${runtimes_check_targets}" "${runtimes_check_targets_needs_reconfig}" "${enable_cir}"
       - name: Upload Artifacts
@@ -117,7 +117,7 @@ jobs:
           call C:\\BuildTools\\Common7\\Tools\\VsDevCmd.bat -arch=amd64 -host_arch=amd64
           # See the comments above in the Linux job for why we define each of
           # these environment variables.
-          bash -c "export SCCACHE_GCS_BUCKET=$CACHE_GCS_BUCKET; export SCCACHE_GCS_RW_MODE=READ_WRITE; export SCCACHE_IDLE_TIMEOUT=0; sccache --start-server; .ci/monolithic-windows.sh \"${{ steps.vars.outputs.windows-projects }}\" \"${{ steps.vars.outputs.windows-check-targets }}\""
+          bash -c "export SCCACHE_GCS_BUCKET=$CACHE_GCS_BUCKET; export SCCACHE_GCS_RW_MODE=READ_WRITE; export SCCACHE_IDLE_TIMEOUT=0; SCCACHE_LOG=info SCCACHE_ERROR_LOG=artifacts/sccache.log sccache --start-server; .ci/monolithic-windows.sh \"${{ steps.vars.outputs.windows-projects }}\" \"${{ steps.vars.outputs.windows-check-targets }}\""
       - name: Upload Artifacts
         # In some cases, Github will fail to upload the artifact. We want to
         # continue anyways as a failed artifact upload is an infra failure, not

``````````

</details>


https://github.com/llvm/llvm-project/pull/155444