$ git clone -n https://src.fedoraproject.org/rpms/rubygem-fake_ftp.git /var/lib/mock/f45-build-34926-692/root/chroot_tmpdir/scmroot/rubygem-fake_ftp
Cloning into '/var/lib/mock/f45-build-34926-692/root/chroot_tmpdir/scmroot/rubygem-fake_ftp'...
$ git fetch origin 7a1943a18f82bdc2a0b8bab144a1cbcfe2f683cf:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-fake_ftp
 * [new ref]         7a1943a18f82bdc2a0b8bab144a1cbcfe2f683cf -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7a1943a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild