From 3903ee56c081a02b2864dba0fee486d6b49139d2 Mon Sep 17 00:00:00 2001
From: makefu <github@syntax-fehler.de>
Date: Fri, 1 Jan 2016 16:19:01 +0100
Subject: emergency init

---
 build-stuff/build-host.py | 161 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 build-stuff/build-host.py

diff --git a/build-stuff/build-host.py b/build-stuff/build-host.py
new file mode 100644
index 0000000..6e7b435
--- /dev/null
+++ b/build-stuff/build-host.py
@@ -0,0 +1,161 @@
+#!/bin/sh
+""" usage: build-host [options] HOSTNAME
+
+Options:
+    --secrets-dir DIR       Path to secrets [Default: ~/secrets/]
+    --stockholm-dir DIR     Path to stockholm [Default: ~/stockholm/]
+    --username USER         Primary username of the new host [Default: $LOGNAME]
+    --create-passwords      creates <secrets/hashedPasswords.nix>, password input is interactive
+
+Tinc keys are stored in secrets-dir/HOSTNAME/retiolum.rsa_key.priv .
+For building shared hosts set secrets-dir to `<secrets/krebs/>`
+"""
+import sys
+import os
+from os.path import join as path_join,exists
+import logging as log
+log.basicConfig(level=log.DEBUG)
+
+def retiolum_ip(hostname):
+    """ warning this function actually writes stuff to the disk
+    """
+    import ipaddress as ip
+    from random import randint
+
+    mynet4 = ip.ip_network("10.243.0.0/16")
+    mynet6 = ip.ip_network("42::/16")
+
+    ret = {"hostname": hostname}
+    ret["v6"] = str(ip.IPv6Address(mynet6[0] +
+            randint(0,mynet6.num_addresses)))+"/128"
+    ret["v4"] = str(ip.IPv4Address(mynet4[0] +
+            randint(0,mynet4.num_addresses)))+"/32"
+    return ret
+
+def write_stockholm_1systems(ret,stockholm_dir):
+    """ writes new nix file in stockholm/$LOGNAME/1systems/${HOSTNAME}.nix if
+    it not yet exists"""
+    p=path_join(stockholm_dir, ret['username'],'1systems',ret['hostname'])
+    if exists (p):
+        log.warn(" {} already exists, will not override with minimal config".format(p))
+    else:
+        log.info("Creating {} with minimal config".format(p))
+        with open(p,"w+") as f:
+            f.write("""{{ config, pkgs, ... }}:
+{{
+    krebs = {{
+        enable = true;
+        build.user = config.krebs.users.{username};
+        build.host = config.krebs.hosts.{hostname};
+    }};
+    # You want to change these :)
+    boot.loader.grub.device = "/dev/sda";
+    fileSystems."/" = {{
+        device = "/dev/sda1";
+    }};
+}}
+        """.format(**ret))
+
+
+def print_stockholm_krebs_entry(ret):
+    print("""# this entry is autogenerated and can be added to
+#   stockholm/krebs/3modules/{username}/default.nix
+{hostname} = rec {{
+    cores = 1;
+    dc = "none";
+    nets = {{
+        retiolm = {{
+            addrs4 = ["{v4}"];
+            addrs6 = ["{v6}"];
+            aliases = [
+                "{hostname}.retiolum"
+            ];
+            tinc.pubkey = ''
+{pubkey}''
+        }};
+    }};
+}};
+          """.format(**ret))
+
+def create_zhosts_file(ret,path):
+    """ creates a new tinc hosts file in path
+    (stockholm/krebs/Zhosts/$hostname) """
+    with open(path,"w+") as f:
+        for i in ('v4','v6'):
+            f.write("Subnet = {}\n".format(ret[i]))
+        f.write(ret['pubkey'])
+
+def generate_tinc_keys(base):
+    """ creates tinc public and private keys in `base`
+        returns rsa public key
+    """
+    from subprocess import Popen,PIPE
+    import shutil
+    from os import rmdir
+    from tempfile import mkdtemp
+    tmpdir = mkdtemp()
+    process = Popen(["tinc","--batch","--config",tmpdir,"generate-keys","2048"],stdout=PIPE,stderr=PIPE,stdin=PIPE,bufsize=0)
+    process.communicate()
+    for i in ["ed25519_key.priv", "ed25519_key.pub",
+              "rsa_key.priv","rsa_key.pub"]:
+        shutil.move(path_join(tmpdir,i),base+"."+i)
+    # should be empty now
+    shutil.rmtree(tmpdir)
+    with open(base+".rsa_key.pub") as pubfile:
+        return pubfile.read()
+
+def prepare_secrets(sec):
+    if not exists(sec):
+        os.makedirs(sec,mode=488)
+        log.info("Creating {}".format(sec))
+    else:
+        log.error(" {} already exists".format(sec))
+        log.error("Use another hostname or remove the folder to continue")
+        sys.exit(1)
+
+def check_existence(files):
+    for f in files:
+        if not exists(f):
+            log.error(" {} does not exist but is a hard requirement for \
+continuing".format(f))
+            log.error("Create/Clone the folder or set it to the correct \
+location via cli options (--help)")
+            log.error(__doc__)
+            sys.exit(1)
+
+def create_passwords(sec):
+    import crypt
+    with open(path_join(sec,"hashedPasswords.nix")):
+    #python3 -c 'import crypt; print(crypt.crypt("test",
+    #crypt.mksalt(crypt.METHOD_SHA512)))'
+
+
+def main():
+    from os.path import expanduser,expandvars
+    from docopt import docopt
+    args = docopt(__doc__)
+    hostname = args["HOSTNAME"]
+    secrets_dir = expanduser(args["--secrets-dir"])
+    username = expandvars(args["--username"])
+    stockholm_dir = expanduser(args["--stockholm-dir"])
+
+    check_existence([secrets_dir,stockholm_dir])
+
+    host_secrets = path_join(secrets_dir,hostname)
+    prepare_secrets(host_secrets)
+
+    ret = retiolum_ip(hostname)
+    ret['username'] = username
+
+    # generate tinc keys, return pubkey
+    retiolum = path_join(secrets_dir,hostname,"retiolum")
+    ret['pubkey'] = generate_tinc_keys(retiolum)
+
+    create_zhosts_file(ret,path_join(stockholm_dir,"krebs/Zhosts",hostname))
+
+    write_stockholm_1systems(ret,stockholm_dir)
+    print_stockholm_krebs_entry(ret)
+    pass
+
+if __name__ == '__main__':
+    main()
-- 
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