$ git clone -n https://src.fedoraproject.org/rpms/rubygem-httpclient.git /var/lib/mock/f45-build-34983-692/root/chroot_tmpdir/scmroot/rubygem-httpclient
Cloning into '/var/lib/mock/f45-build-34983-692/root/chroot_tmpdir/scmroot/rubygem-httpclient'...
$ git fetch origin 01036fe4e11cde6e437d732ae96c46ee59c93bbd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rubygem-httpclient
 * [new ref]         01036fe4e11cde6e437d732ae96c46ee59c93bbd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 01036fe Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild