$ git clone -n https://src.fedoraproject.org/rpms/ghc-cryptohash.git /var/lib/mock/f38-build-side-42-init-devel-805250-28185/root/chroot_tmpdir/scmroot/ghc-cryptohash
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-805250-28185/root/chroot_tmpdir/scmroot/ghc-cryptohash'...
$ git fetch origin f8274a4d4e123171d9e3622145dfdec71eb5297f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-cryptohash
 * [new ref]         f8274a4d4e123171d9e3622145dfdec71eb5297f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f8274a4 Convert to %autorelease and %autochangelog