$ git clone -n https://src.fedoraproject.org/rpms/ghc-show.git /var/lib/mock/f38-build-side-42-init-devel-797536-28060/root/chroot_tmpdir/scmroot/ghc-show
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-797536-28060/root/chroot_tmpdir/scmroot/ghc-show'...
$ git fetch origin b10e23507ee9ff6565c9074b005fb17bf0b0d486:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-show
 * [new ref]         b10e23507ee9ff6565c9074b005fb17bf0b0d486 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b10e235 Convert to %autorelease and %autochangelog