$ git clone -n https://src.fedoraproject.org/rpms/exec-maven-plugin.git /var/lib/mock/f40-build-2217638-52561/root/chroot_tmpdir/scmroot/exec-maven-plugin
Cloning into '/var/lib/mock/f40-build-2217638-52561/root/chroot_tmpdir/scmroot/exec-maven-plugin'...
$ git fetch origin 1bb42ae4bf4143613128b5dca7e4754cb27c6862:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/exec-maven-plugin
 * [new ref]         1bb42ae4bf4143613128b5dca7e4754cb27c6862 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1bb42ae Update to upstream version 3.1.1