$ git clone -n https://src.fedoraproject.org/rpms/ghc-transformers-base.git /var/lib/mock/f38-build-side-42-init-devel-757437-27679/root/chroot_tmpdir/scmroot/ghc-transformers-base
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-757437-27679/root/chroot_tmpdir/scmroot/ghc-transformers-base'...
$ git fetch origin bbce4232a0f7c41fdc6879e99f2dac8d14438e15:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-transformers-base
 * [new ref]         bbce4232a0f7c41fdc6879e99f2dac8d14438e15 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbce423 Convert to %autorelease and %autochangelog