$ git clone -n https://src.fedoraproject.org/rpms/postfix.git /var/lib/mock/f40-build-772018-126126/root/chroot_tmpdir/scmroot/postfix
Cloning into '/var/lib/mock/f40-build-772018-126126/root/chroot_tmpdir/scmroot/postfix'...
$ git reset --hard f1e8416149086937053fc2e1876f20ff6438d931
HEAD is now at f1e8416 New version