$ git clone -n https://src.fedoraproject.org/rpms/srt.git /var/lib/mock/f41-build-side-1-2771341-32225/root/chroot_tmpdir/scmroot/srt
Cloning into '/var/lib/mock/f41-build-side-1-2771341-32225/root/chroot_tmpdir/scmroot/srt'...
$ git fetch origin 2f5d3474dc4779bf06fc2b8eb63c61aaafbcebfc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/srt
 * [new ref]         2f5d3474dc4779bf06fc2b8eb63c61aaafbcebfc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2f5d347 Explicitely BR: nettle-devel