$ git clone -n https://src.fedoraproject.org/rpms/ghc-string-conversions.git /var/lib/mock/f38-build-side-42-init-devel-567946-25905/root/chroot_tmpdir/scmroot/ghc-string-conversions
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-567946-25905/root/chroot_tmpdir/scmroot/ghc-string-conversions'...
$ git fetch origin b169db9d0a8a9ecc7a69fa130f806513e9329eb5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-string-conversions
 * [new ref]         b169db9d0a8a9ecc7a69fa130f806513e9329eb5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b169db9 Convert to %autorelease and %autochangelog