$ git clone -n https://src.fedoraproject.org/rpms/system-switch-java.git /var/lib/mock/f41-build-1041898-18994/root/chroot_tmpdir/scmroot/system-switch-java
Cloning into '/var/lib/mock/f41-build-1041898-18994/root/chroot_tmpdir/scmroot/system-switch-java'...
$ git fetch origin 4ef869e5d54aee60b8f97af3aa423e90891bc812:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/system-switch-java
 * [new ref]         4ef869e5d54aee60b8f97af3aa423e90891bc812 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4ef869e Eliminate use of obsolete %patchN syntax (#2283636)