$ git clone -n https://src.fedoraproject.org/rpms/passwd.git /var/lib/mock/f40-build-2220943-52672/root/chroot_tmpdir/scmroot/passwd
Cloning into '/var/lib/mock/f40-build-2220943-52672/root/chroot_tmpdir/scmroot/passwd'...
$ git fetch origin 46e8c1dc94870cdf654025e1334a8e6036cfee3e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/passwd
 * [new ref]         46e8c1dc94870cdf654025e1334a8e6036cfee3e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 46e8c1d use make macro for installation (PR#2)