$ git clone -n https://src.fedoraproject.org/rpms/rubygem-websocket-driver.git /var/lib/mock/f45-build-35394-695/root/chroot_tmpdir/scmroot/rubygem-websocket-driver
Cloning into '/var/lib/mock/f45-build-35394-695/root/chroot_tmpdir/scmroot/rubygem-websocket-driver'...
$ git fetch origin f5fb09555c7c1188cba87215bed55f5d0e82cdc9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-websocket-driver
 * [new ref]         f5fb09555c7c1188cba87215bed55f5d0e82cdc9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f5fb095 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild