$ git clone -n https://src.fedoraproject.org/rpms/postfix.git /var/lib/mock/f37-build-675183-75960/root/chroot_tmpdir/scmroot/postfix
Cloning into '/var/lib/mock/f37-build-675183-75960/root/chroot_tmpdir/scmroot/postfix'...
$ git reset --hard c38b56850d36fe51d044bb235ad1a318d3ed6458
HEAD is now at c38b568 New version