$ git clone -n https://src.fedoraproject.org/rpms/ghc-servant-server.git /var/lib/mock/f38-build-side-42-init-devel-1380153-30706/root/chroot_tmpdir/scmroot/ghc-servant-server
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1380153-30706/root/chroot_tmpdir/scmroot/ghc-servant-server'...
$ git fetch origin 3c5f5d7c09e10b6856136f2f4794c9d7ab6b0908:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-servant-server
 * [new ref]         3c5f5d7c09e10b6856136f2f4794c9d7ab6b0908 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c5f5d7 Convert to %autorelease and %autochangelog