$ git clone -n https://src.fedoraproject.org/rpms/ghc-ConfigFile.git /var/lib/mock/f39-build-2097283-50424/root/chroot_tmpdir/scmroot/ghc-ConfigFile
Cloning into '/var/lib/mock/f39-build-2097283-50424/root/chroot_tmpdir/scmroot/ghc-ConfigFile'...
$ git fetch origin bf2c0a529f641ebcdb5064a53f7a9ed478ccd289:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-ConfigFile
 * [new ref]         bf2c0a529f641ebcdb5064a53f7a9ed478ccd289 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bf2c0a5 bump release