$ git clone -n https://src.fedoraproject.org/rpms/vgrep.git /var/lib/mock/f40-build-2044652-48732/root/chroot_tmpdir/scmroot/vgrep
Cloning into '/var/lib/mock/f40-build-2044652-48732/root/chroot_tmpdir/scmroot/vgrep'...
$ git fetch origin c324e765a4ff7aae0009dbb971691f02ab4dd2af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/vgrep
 * [new ref]         c324e765a4ff7aae0009dbb971691f02ab4dd2af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c324e76 Update to version 2.7.0, resolves rhbz#2245195