$ git clone -n https://src.fedoraproject.org/rpms/chroma.git /var/lib/mock/f45-build-3933-329/root/chroot_tmpdir/scmroot/chroma
Cloning into '/var/lib/mock/f45-build-3933-329/root/chroot_tmpdir/scmroot/chroma'...
$ git fetch origin d26ea43ca9494169f6cf06da7eaa95cbe6b75efe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chroma
 * [new ref]         d26ea43ca9494169f6cf06da7eaa95cbe6b75efe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d26ea43 Import from SRPM (rhbz#2516950)