$ git clone -n https://src.fedoraproject.org/rpms/passim.git /var/lib/mock/f40-build-2220942-52672/root/chroot_tmpdir/scmroot/passim
Cloning into '/var/lib/mock/f40-build-2220942-52672/root/chroot_tmpdir/scmroot/passim'...
$ git fetch origin bb925a9bd911c92117852498e188df03b3c1e548:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/passim
 * [new ref]         bb925a9bd911c92117852498e188df03b3c1e548 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb925a9 New upstream release