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GCP: Fix panic while parsing a specific build job log
The `cloudbuildResourcesFromBuildLog()` function from the internal GCP package could cause panic while parsing Build job log which failed early and didn't create any Compute Engine resources. The function relied on the `Regexp.FindStringSubmatch()` method to always return a match while being used on the build log. Accessing a member of a nil slice would cause a panic in `osbuild-worker`, such as: Stack trace of thread 185316: #0 0x0000564e5393b5e1 runtime.raise (osbuild-worker) #1 0x0000564e5391fa1e runtime.sigfwdgo (osbuild-worker) #2 0x0000564e5391e354 runtime.sigtrampgo (osbuild-worker) #3 0x0000564e5393b953 runtime.sigtramp (osbuild-worker) #4 0x00007f37e98e3b20 __restore_rt (libpthread.so.0) #5 0x0000564e5393b5e1 runtime.raise (osbuild-worker) #6 0x0000564e5391f5ea runtime.crash (osbuild-worker) #7 0x0000564e53909306 runtime.fatalpanic (osbuild-worker) #8 0x0000564e53908ca1 runtime.gopanic (osbuild-worker) #9 0x0000564e53906b65 runtime.goPanicIndex (osbuild-worker) #10 0x0000564e5420b36e github.com/osbuild/osbuild-composer/internal/cloud/gcp.cloudbuildResourcesFromBuildLog (osbuild-worker) #11 0x0000564e54209ebb github.com/osbuild/osbuild-composer/internal/cloud/gcp.(*GCP).CloudbuildBuildCleanup (osbuild-worker) #12 0x0000564e54b05a9b main.(*OSBuildJobImpl).Run (osbuild-worker) #13 0x0000564e54b08854 main.main (osbuild-worker) #14 0x0000564e5390b722 runtime.main (osbuild-worker) #15 0x0000564e53939a11 runtime.goexit (osbuild-worker) Add a unit test testing this scenario. Make the `cloudbuildResourcesFromBuildLog()` function more robust and not blindly expect to find matches in the build log. As a result the `cloudbuildBuildResources` struct instance returned from the function may be empty. Subsequently make sure that the `CloudbuildBuildCleanup()` method handles an empty `cloudbuildBuildResources` instance correctly. Specifically the `storageCacheDir.bucket` may be an empty string and thus won't exist. Ensure that this does not result in infinite loop by checking for `storage.ErrBucketNotExist` while iterating the bucket objects. Signed-off-by: Tomas Hozza <[email protected]>
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