git-clone task cannot handle backslash in the username of a secret

[kulon]

The git-clone task fails if the secret associated with the service account used to run the task contains a backslash "" in the username. For example, if the username of the secret contains a value "domain\firstname.lastname", the git-clone task will throw the following error:

Error running git [init /workspace/output/]: exit status 128\nfatal: bad config line 4 in file /tekton/home/.gitconfig\n","stacktrace":"github.com/tektoncd/pipeline/pkg/git.run\n\t/opt/app-root/src/go/src/github.com/tektoncd/pipeline/pkg/git/git.go:47\ngithub.com/tektoncd/pipeline/pkg/git.Fetch\n\t/opt/app-root/src/go/src/github.com/tektoncd/pipeline/pkg/git/git.go:74\nmain.main\n\t/opt/app-root/src/go/src/github.com/tektoncd/pipeline/cmd/git-init/main.go:52\nruntime.main\n\t/usr/lib/golang/src/runtime/proc.go:203"}
{"level":"fatal","ts":1618348159.1216874,"caller":"git-init/main.go:53","msg":"Error fetching git repository: exit status 128","stacktrace":"main.main\n\t/opt/app-root/src/go/src/github.com/tektoncd/pipeline/cmd/git-init/main.go:53\nruntime.main\n\t/usr/lib/golang/src/runtime/proc.go:203"}

A workaround would be to use a different form of the username if applicable. For example, the following format would be handled successfully by the task: "[email protected]".

[kulon]

Reported a bug #3887.
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