$ git clone -n https://src.fedoraproject.org/rpms/ghc-bytestring-trie.git /var/lib/mock/f38-build-side-42-init-devel-971145-28813/root/chroot_tmpdir/scmroot/ghc-bytestring-trie
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-971145-28813/root/chroot_tmpdir/scmroot/ghc-bytestring-trie'...
$ git fetch origin 38e44188836f0d114db0cc065143e8d6c0c7053f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-bytestring-trie
 * [new ref]         38e44188836f0d114db0cc065143e8d6c0c7053f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 38e4418 Convert to %autorelease and %autochangelog