$ git clone -n https://src.fedoraproject.org/rpms/pcb.git /var/lib/mock/f38-build-side-42-init-devel-610295-26263/root/chroot_tmpdir/scmroot/pcb
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-610295-26263/root/chroot_tmpdir/scmroot/pcb'...
$ git fetch origin 0523f985ff686ffff4cdab2944565f42fc8618dc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pcb
 * [new ref]         0523f985ff686ffff4cdab2944565f42fc8618dc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0523f98 Fix C99 compatibility issue