$ git clone -n https://src.fedoraproject.org/rpms/R-readxl.git /var/lib/mock/f45-build-6359-348/root/chroot_tmpdir/scmroot/R-readxl
Cloning into '/var/lib/mock/f45-build-6359-348/root/chroot_tmpdir/scmroot/R-readxl'...
$ git fetch origin d29955243bb75b5b8de0279ca83c30c1b3c834ee:KOJI_FETCH_HEAD
fatal: unable to access 'https://src.fedoraproject.org/rpms/R-readxl.git/': Failed to connect to src.fedoraproject.org port 443 after 3897 ms: Could not connect to server
$ git reset --hard d29955243bb75b5b8de0279ca83c30c1b3c834ee
HEAD is now at d299552 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild