$ git clone -n https://src.fedoraproject.org/rpms/java-latest-openjdk-portable.git /var/lib/mock/f38-build-727402-100657/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable
Cloning into '/var/lib/mock/f38-build-727402-100657/root/chroot_tmpdir/scmroot/java-latest-openjdk-portable'...
$ git fetch origin 75c9dc1ba0a5ce6b54f8f77f6fdb54aaa916b2b1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-latest-openjdk-portable
 * [new ref]         75c9dc1ba0a5ce6b54f8f77f6fdb54aaa916b2b1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75c9dc1 Using newly generated sources