$ git clone -n https://src.fedoraproject.org/rpms/qtxdg-tools.git /var/lib/mock/f45-build-34182-680/root/chroot_tmpdir/scmroot/qtxdg-tools
Cloning into '/var/lib/mock/f45-build-34182-680/root/chroot_tmpdir/scmroot/qtxdg-tools'...
$ git fetch origin c35d2c75cf45566df5e70889100d23a86f0855a8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/qtxdg-tools
 * [new ref]         c35d2c75cf45566df5e70889100d23a86f0855a8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c35d2c7 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild