$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-cairo.git /var/lib/mock/f38-build-side-42-init-devel-1049092-29762/root/chroot_tmpdir/scmroot/ghc-gi-cairo
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1049092-29762/root/chroot_tmpdir/scmroot/ghc-gi-cairo'...
$ git fetch origin fada11aa7d8edb8938b070d223aaf04625c74dfe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-cairo
 * [new ref]         fada11aa7d8edb8938b070d223aaf04625c74dfe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fada11a rebuild