$ git clone -n https://src.fedoraproject.org/rpms/R-sys.git /var/lib/mock/f45-build-6442-348/root/chroot_tmpdir/scmroot/R-sys
Cloning into '/var/lib/mock/f45-build-6442-348/root/chroot_tmpdir/scmroot/R-sys'...
$ git fetch origin 1f31eb8b78ad5190760074e8a5457ab145e8e793:KOJI_FETCH_HEAD
fatal: unable to access 'https://src.fedoraproject.org/rpms/R-sys.git/': Failed to connect to src.fedoraproject.org port 443 after 2888 ms: Could not connect to server
$ git reset --hard 1f31eb8b78ad5190760074e8a5457ab145e8e793
HEAD is now at 1f31eb8 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild