$ git clone -n https://src.fedoraproject.org/rpms/maven-compiler-plugin.git /var/lib/mock/f40-build-2434012-60729/root/chroot_tmpdir/scmroot/maven-compiler-plugin
Cloning into '/var/lib/mock/f40-build-2434012-60729/root/chroot_tmpdir/scmroot/maven-compiler-plugin'...
$ git fetch origin 1350b8622a1c75a9008a22a2eaf878376d4deb09:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/maven-compiler-plugin
 * [new ref]         1350b8622a1c75a9008a22a2eaf878376d4deb09 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1350b86 Update to upstream version 3.12.1