$ git clone -n https://src.fedoraproject.org/rpms/ghc-tabular.git /var/lib/mock/f38-build-side-42-init-devel-807790-28235/root/chroot_tmpdir/scmroot/ghc-tabular
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-807790-28235/root/chroot_tmpdir/scmroot/ghc-tabular'...
$ git fetch origin 2b40eb925f77dd84870fbda1e503cdbf9cab0e02:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-tabular
 * [new ref]         2b40eb925f77dd84870fbda1e503cdbf9cab0e02 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2b40eb9 Convert to %autorelease and %autochangelog