publish.py

#!/usr/bin/env python3

import sys
import subprocess
import re
import os
import json

def main():
    # generate version.js
    sha1 = git("rev-parse", "--verify", "HEAD").rstrip()
    if re.match(r"^[0-9a-f]{40}$", sha1) == None:
        sys.exit("ERROR: malformed git rev-parse output: " + repr(sha1))
    recent_tag = git("describe", "--tags", "--abbrev=0").rstrip()
    if re.match(r"^\d+\.\d+\.\d+$", recent_tag) == None:
        sys.exit("ERROR: unexpected output from git describe: " + repr(recent_tag))
    with open("version.js", "w") as f:
        f.write('var VERSION = {};\n'.format(json.dumps({
            "sha1": sha1,
            "tag": recent_tag,
        })))

    # determine experimental branch
    branch_name = git("rev-parse", "--abbrev-ref", "HEAD").rstrip()
    if branch_name == "master":
        publish_subdir = ""
    else:
        subdir = "experimental/" + branch_name
        if os.path.normpath(subdir) != subdir:
            sys.exit("ERROR: strange path characters in branch name: " + repr(branch_name))
        publish_subdir = subdir + "/"

    cmd = [
        "s3cmd", "sync",
        "-P", "--no-preserve", "--add-header=Cache-Control: max-age=0, must-revalidate",
        "index.html", "a.js", "version.js",
        "s3://wolfesoftware.com/snakefall/" + publish_subdir,
    ]
    print(" ".join(cmd))
    subprocess.check_call(cmd)

def git(*args):
    cmd = ["git"] + list(args)
    return subprocess.check_output(cmd).decode("utf8")

if __name__ == "__main__":
    main()