$ git clone -n https://src.fedoraproject.org/rpms/libcanberra.git /var/lib/mock/f45-build-15925-480/root/chroot_tmpdir/scmroot/libcanberra
Cloning into '/var/lib/mock/f45-build-15925-480/root/chroot_tmpdir/scmroot/libcanberra'...
$ git fetch origin 58ede5c70d9f6885b0d5e24695fc50c258ebe5c8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libcanberra
 * [new ref]         58ede5c70d9f6885b0d5e24695fc50c258ebe5c8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 58ede5c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild