$ git clone -n https://src.fedoraproject.org/rpms/ghc-assoc.git /var/lib/mock/f38-build-side-42-init-devel-1013160-29459/root/chroot_tmpdir/scmroot/ghc-assoc
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1013160-29459/root/chroot_tmpdir/scmroot/ghc-assoc'...
$ git fetch origin 2d8038f6db9f0f0c59bf055cf78c33dbb5a26ea1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-assoc
 * [new ref]         2d8038f6db9f0f0c59bf055cf78c33dbb5a26ea1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2d8038f Convert to %autorelease and %autochangelog