$ git clone -n https://src.fedoraproject.org/rpms/ghc-sourcemap.git /var/lib/mock/f38-build-side-42-init-devel-1010641-29395/root/chroot_tmpdir/scmroot/ghc-sourcemap
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1010641-29395/root/chroot_tmpdir/scmroot/ghc-sourcemap'...
$ git fetch origin 16f2b5a8b97d40c069908e6e5f3ccaf1b4c85570:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-sourcemap
 * [new ref]         16f2b5a8b97d40c069908e6e5f3ccaf1b4c85570 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 16f2b5a Convert to %autorelease and %autochangelog