$ git clone -n https://src.fedoraproject.org/rpms/ghc-tls.git /var/lib/mock/f38-build-side-42-init-devel-778438-27878/root/chroot_tmpdir/scmroot/ghc-tls
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-778438-27878/root/chroot_tmpdir/scmroot/ghc-tls'...
$ git fetch origin b662191f374d0b46ae2cbb58d528e65fbb5ecf78:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tls
 * [new ref]         b662191f374d0b46ae2cbb58d528e65fbb5ecf78 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b662191 Convert to %autorelease and %autochangelog