$ git clone -n https://src.fedoraproject.org/rpms/xfwm4.git /var/lib/mock/f45-build-38892-730/root/chroot_tmpdir/scmroot/xfwm4
Cloning into '/var/lib/mock/f45-build-38892-730/root/chroot_tmpdir/scmroot/xfwm4'...
$ git fetch origin c10ab4c6ec16bd9ca9988b9645155b4e4ca535ea:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xfwm4
 * [new ref]         c10ab4c6ec16bd9ca9988b9645155b4e4ca535ea -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c10ab4c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild