How do I emit the SHA1 of a git branch using MSBuild

Question

The following git command...

git show -s --pretty=format:%T master

...will emit the SHA1 of the current head of master.

However the following MSBuild task only produces a literal 'T'

<Exec Command="git show -s --pretty=format:%T master" />

What do I need to change, to emit the genuine SHA1?

Answer 1

So apparently the trick is to double escape the % sign.

ie

<Exec Command="git show -s --pretty=format:%25%25T master" />

I'm not really sure why this works though, so I'd appreciate comments on why this might be.