$ git clone -n https://src.fedoraproject.org/rpms/rubygem-css_parser.git /var/lib/mock/f40-build-2215168-52412/root/chroot_tmpdir/scmroot/rubygem-css_parser
Cloning into '/var/lib/mock/f40-build-2215168-52412/root/chroot_tmpdir/scmroot/rubygem-css_parser'...
$ git fetch origin e59be1a06f2abda575ab818b0c9c2a525ca001a7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-css_parser
 * [new ref]         e59be1a06f2abda575ab818b0c9c2a525ca001a7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e59be1a Bump version to 1.16.0