$ git clone -n https://src.fedoraproject.org/rpms/java-runtime-decompiler.git /var/lib/mock/f41-build-side-1-2957676-35607/root/chroot_tmpdir/scmroot/java-runtime-decompiler
Cloning into '/var/lib/mock/f41-build-side-1-2957676-35607/root/chroot_tmpdir/scmroot/java-runtime-decompiler'...
$ git fetch origin 3615ff4b1da4323cac02dd912815da90e34d56f9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-runtime-decompiler
 * [new ref]         3615ff4b1da4323cac02dd912815da90e34d56f9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3615ff4 convert GPLv3 license to SPDX