$ git clone -n https://src.fedoraproject.org/rpms/emacs-blacken.git /var/lib/mock/f45-build-8051-374/root/chroot_tmpdir/scmroot/emacs-blacken
Cloning into '/var/lib/mock/f45-build-8051-374/root/chroot_tmpdir/scmroot/emacs-blacken'...
$ git fetch origin 9921b0c6843ba33b2ef6021727736174d2637c72:KOJI_FETCH_HEAD
fatal: unable to access 'https://src.fedoraproject.org/rpms/emacs-blacken.git/': Recv failure: Connection reset by peer
$ git reset --hard 9921b0c6843ba33b2ef6021727736174d2637c72
HEAD is now at 9921b0c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild