$ git clone -n https://src.fedoraproject.org/rpms/ghc-atomic-write.git /var/lib/mock/f38-build-side-42-init-devel-1037666-29747/root/chroot_tmpdir/scmroot/ghc-atomic-write
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1037666-29747/root/chroot_tmpdir/scmroot/ghc-atomic-write'...
$ git fetch origin 2fa1b29a86f74648d587ea1175e893b0a55c8c33:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-atomic-write
 * [new ref]         2fa1b29a86f74648d587ea1175e893b0a55c8c33 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2fa1b29 Convert to %autorelease and %autochangelog