Alter rev-parse syntax to support msys git #2668
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On windows,
msys
andcygwin
versions ofgit
need braces to be escaped when they are invoked via subprocess. (This appears to be an unfortunate side effect of the machinery that converts windows paths to posix-like paths for the executable, and is usually hidden when executing from an msys based shell).If they are not escaped, then
rev^{commit]
becomes a meaninglessrev^commit
to anmsys
git
, resulting in an error.In contrast, we do not want to escape the braces if passing
rev^{commit}
to any other form ofgit
. We can avoid having to decide whether escaping is needed by using the alternative notation^0
.As noted in the
rev-parse
documentationPull Request Check List
Resolves: #2667