$ git clone -n https://src.fedoraproject.org/rpms/java-1.8.0-openjdk-portable.git /var/lib/mock/f40-build-1626210-24118/root/chroot_tmpdir/scmroot/java-1.8.0-openjdk-portable
Cloning into '/var/lib/mock/f40-build-1626210-24118/root/chroot_tmpdir/scmroot/java-1.8.0-openjdk-portable'...
$ git fetch origin 0fdcee47eb1f1c167f10cfb81b1b282443e29504:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-1.8.0-openjdk-portable
 * [new ref]         0fdcee47eb1f1c167f10cfb81b1b282443e29504 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fdcee4 Merge branch 'rawhide' into f40