$ git clone -n https://src.fedoraproject.org/rpms/R-pdftools.git /var/lib/mock/f45-build-6296-347/root/chroot_tmpdir/scmroot/R-pdftools
Cloning into '/var/lib/mock/f45-build-6296-347/root/chroot_tmpdir/scmroot/R-pdftools'...
$ git fetch origin 96b5fadc3c9c0ca30b5c8462354b2ef6523b0feb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-pdftools
 * [new ref]         96b5fadc3c9c0ca30b5c8462354b2ef6523b0feb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96b5fad Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild