Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/7569#issuecomment-123814178
As a user, I'd like it if the behavior returned me back to whatever
`__git_ps1` displays. Here's an excerpt from the relevant bash code:
```bash
local g="$(git rev-parse --git-dir 2>/dev/null)"
[...]
if ! b="$(git symbolic-ref HEAD 2>/dev/null)"
then
if ! b="$(git describe --exact-match HEAD 2>/dev/null)"
then
b="$(cut -c1-7 "$g/HEAD")..."
fi
fi
```
I think that `__git_ps1`'s policy is something like this:
- If you are checked out to a tag (which can be detected using `git
describe --exact-match HEAD`), then display that tag name.
- Otherwise, grab the identifier from `.git/HEAD`.
- If you are checked out to a branch like `master`, then this will
contain something like `ref: refs/heads/master`, so you'll have to strip off
the appropriate prefix.
- If you are checked out to a detached head, then this will contain only
a SHA.
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