$ git clone -n https://src.fedoraproject.org/rpms/ghc-boxes.git /var/lib/mock/f38-build-side-42-init-devel-605074-26245/root/chroot_tmpdir/scmroot/ghc-boxes
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-605074-26245/root/chroot_tmpdir/scmroot/ghc-boxes'...
$ git fetch origin 26ecd93a19cc4205c4304e91913134356e3a4c5f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-boxes
 * [new ref]         26ecd93a19cc4205c4304e91913134356e3a4c5f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26ecd93 Convert to %autorelease and %autochangelog