$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-gobject.git /var/lib/mock/f38-build-side-42-init-devel-900011-28589/root/chroot_tmpdir/scmroot/ghc-gi-gobject
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-900011-28589/root/chroot_tmpdir/scmroot/ghc-gi-gobject'...
$ git fetch origin 91f5ecbe75ea85b020d101b65ef556d9a9c5eb87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-gobject
 * [new ref]         91f5ecbe75ea85b020d101b65ef556d9a9c5eb87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91f5ecb rebuild