$ git clone -n https://src.fedoraproject.org/rpms/ghc-modern-uri.git /var/lib/mock/f40-build-763373-122473/root/chroot_tmpdir/scmroot/ghc-modern-uri
Cloning into '/var/lib/mock/f40-build-763373-122473/root/chroot_tmpdir/scmroot/ghc-modern-uri'...
$ git fetch origin a6c7cf0c2b97145cda5236bf052b6d752fbcef50:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-modern-uri
 * [new ref]         a6c7cf0c2b97145cda5236bf052b6d752fbcef50 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a6c7cf0 bump release