$ git clone -n https://src.fedoraproject.org/rpms/ghc-gtk.git /var/lib/mock/f38-build-side-42-init-devel-908285-28677/root/chroot_tmpdir/scmroot/ghc-gtk
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-908285-28677/root/chroot_tmpdir/scmroot/ghc-gtk'...
$ git fetch origin 24cf6cdbc73f33c6105d46f031bc7e0553a310f8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gtk
 * [new ref]         24cf6cdbc73f33c6105d46f031bc7e0553a310f8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 24cf6cd Convert to %autorelease and %autochangelog