$ git clone -n https://src.fedoraproject.org/rpms/ghc-extra.git /var/lib/mock/f38-build-side-42-init-devel-921601-28736/root/chroot_tmpdir/scmroot/ghc-extra
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-921601-28736/root/chroot_tmpdir/scmroot/ghc-extra'...
$ git fetch origin 9d1c6adaa275fb15336ccf1134591e32fb254cc5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-extra
 * [new ref]         9d1c6adaa275fb15336ccf1134591e32fb254cc5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d1c6ad Convert to %autorelease and %autochangelog