$ git clone -n https://src.fedoraproject.org/rpms/java-diff-utils.git /var/lib/mock/f40-build-1904649-25073/root/chroot_tmpdir/scmroot/java-diff-utils
Cloning into '/var/lib/mock/f40-build-1904649-25073/root/chroot_tmpdir/scmroot/java-diff-utils'...
$ git fetch origin fb390921eee0c0bd28d66d81be9007fb1394bc5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/java-diff-utils
 * [new ref]         fb390921eee0c0bd28d66d81be9007fb1394bc5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fb39092 Rebuilt for java-21-openjdk as system jdk