$ git clone -n https://src.fedoraproject.org/rpms/linuxdoc-tools.git /var/lib/mock/f45-build-17446-499/root/chroot_tmpdir/scmroot/linuxdoc-tools
Cloning into '/var/lib/mock/f45-build-17446-499/root/chroot_tmpdir/scmroot/linuxdoc-tools'...
$ git fetch origin 6b90747f80b9446d18456ea8055da2297280bbe2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/linuxdoc-tools
 * [new ref]         6b90747f80b9446d18456ea8055da2297280bbe2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b90747 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild