$ git clone -n https://src.fedoraproject.org/rpms/ghc-regex-tdfa.git /var/lib/mock/f38-build-side-42-init-devel-730872-27448/root/chroot_tmpdir/scmroot/ghc-regex-tdfa
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-730872-27448/root/chroot_tmpdir/scmroot/ghc-regex-tdfa'...
$ git fetch origin c3895997f1404a11a4043586ab288022e67503d8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-regex-tdfa
 * [new ref]         c3895997f1404a11a4043586ab288022e67503d8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c389599 Convert to %autorelease and %autochangelog