$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk-portable.git /var/lib/mock/f40-build-2095718-50392/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable
Cloning into '/var/lib/mock/f40-build-2095718-50392/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable'...
$ git fetch origin a71185e830652280780c2d1c5c184feff3f21d2e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk-portable
 * [new ref]         a71185e830652280780c2d1c5c184feff3f21d2e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a71185e Bumped release for build once/repack everywhere