$ git clone -n https://src.fedoraproject.org/rpms/ghc-atomic-write.git /var/lib/mock/f39-build-1937498-43136/root/chroot_tmpdir/scmroot/ghc-atomic-write
Cloning into '/var/lib/mock/f39-build-1937498-43136/root/chroot_tmpdir/scmroot/ghc-atomic-write'...
$ git fetch origin acac2e7be6f94c9d03275e01ef53b816d508c832:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-atomic-write
 * [new ref]         acac2e7be6f94c9d03275e01ef53b816d508c832 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acac2e7 bump release