$ git clone -n https://src.fedoraproject.org/rpms/picocom.git /var/lib/mock/f41-build-1268170-23086/root/chroot_tmpdir/scmroot/picocom
Cloning into '/var/lib/mock/f41-build-1268170-23086/root/chroot_tmpdir/scmroot/picocom'...
$ git fetch origin 9d2bfacc504173713db5dc27a79397a1b57bd4ac:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/picocom
 * [new ref]         9d2bfacc504173713db5dc27a79397a1b57bd4ac -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d2bfac Switch to new fork, update to new version scheme ( rhbz#2256866 )