$ git clone -n https://src.fedoraproject.org/rpms/ghc-concatenative.git /var/lib/mock/f38-build-side-42-init-devel-650589-26477/root/chroot_tmpdir/scmroot/ghc-concatenative
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-650589-26477/root/chroot_tmpdir/scmroot/ghc-concatenative'...
$ git fetch origin 27a6858d1884adf6495cc9208707939f6fddd09b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-concatenative
 * [new ref]         27a6858d1884adf6495cc9208707939f6fddd09b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 27a6858 Convert to %autorelease and %autochangelog