$ git clone -n https://src.fedoraproject.org/rpms/guava.git /var/lib/mock/f40-build-2646336-66622/root/chroot_tmpdir/scmroot/guava
Cloning into '/var/lib/mock/f40-build-2646336-66622/root/chroot_tmpdir/scmroot/guava'...
$ git fetch origin 6c2b2f410904e35944b3590d501a7b8ba4c56168:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guava
 * [new ref]         6c2b2f410904e35944b3590d501a7b8ba4c56168 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6c2b2f4 Rebuilt for java-21-openjdk as system jdk