$ git clone -n https://src.fedoraproject.org/rpms/rubygem-http_parser.rb.git /var/lib/mock/f45-build-34984-692/root/chroot_tmpdir/scmroot/rubygem-http_parser.rb
Cloning into '/var/lib/mock/f45-build-34984-692/root/chroot_tmpdir/scmroot/rubygem-http_parser.rb'...
$ git fetch origin 9a95c4d9ab20a6b6fcdc78b5749a377fdbd3d977:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-http_parser.rb
 * [new ref]         9a95c4d9ab20a6b6fcdc78b5749a377fdbd3d977 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9a95c4d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild