$ git clone -n https://src.fedoraproject.org/rpms/ghc-servant-client.git /var/lib/mock/f38-build-side-42-init-devel-1331016-30692/root/chroot_tmpdir/scmroot/ghc-servant-client
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1331016-30692/root/chroot_tmpdir/scmroot/ghc-servant-client'...
$ git fetch origin 8f4c205f41d04aafd4c3945aca71c98bf0a22ada:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-servant-client
 * [new ref]         8f4c205f41d04aafd4c3945aca71c98bf0a22ada -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8f4c205 Convert to %autorelease and %autochangelog