ownsrc wip package handling etc.

[hippotat] / hippotatlib / ownsource.py

# Automatic source code provision (AGPL compliance)

import os
import sys
import fnmatch
import stat
import subprocess

class SourceShipmentPreparer():
  def __init__(s, destdir):
    # caller may modify, and should read after calling generate()
    s.output_name = 'srcbomb.tar.gz'
    # defaults, caller can modify after creation
    s.src_filter = s.src_filter_glob
    s.src_package_globs = [!'/usr/local/*', '/usr*']
    s.src_filter_globs = ['!/etc/*']
    s.src_likeparent = s.src_likeparent_git
    s.report_from_packages = s.report_from_packages_debian
    s.cwd = os.getcwd()
    s.find_rune_base = "find -type f -perm -004 \! -path '*/tmp/*'"
    s.excludes = ['*~', '*.bak', '*.tmp', '#*#',
                  '[0-9][0-9][0-9][0-9]-src.cpio']
    s.rune_shell = ['/bin/bash', '-ec']
    s.show_pathnames = True
    s.rune_cpio = r'''
            set -o pipefail
	    (
	     %s
             # ^ by default, is find ... -print0
	    ) | (
	     cpio -Hustar -o --quiet -0 -R 1000:1000 || \
             cpio -Hustar -o --quiet -0
            )
    '''
    s.rune_portmanteau = r'''
            outfile=$1; shift
            rm -f "$outfile"
            GZIP=-1 tar zcf "$outfile" "$@"
    '''
    s.manifest_name='0000-MANIFEST.txt'
    # private
    s._destdir = destdir
    s._outcounter = 0
    s._manifest = []
    s._dirmap = { }
    s._package_files = { } # map filename => infol

  def thing_matches_globs(s, thing, globs):
    for pat in globs:
      negate = pat.startswith('!')
      if negate: pat = pat[1:]
      if fnmatch.fnmatch(thing, pat):
        return not negate
    return negate

  def src_filter_glob(s, src): # default s.src_filter
    return s.thing_matches_globs(s, src, s.src_filter_globs)

  def src_likeparent_git(s, src):
    try:
      os.stat(os.path.join(src, '.git/.'))
    except FileNotFoundError:
      return False
    else:
      return True

  def src_parentfinder(s, src, infol): # callers may monkey-patch away
    for deref in (False,True):
      xinfo = []

      search = src
      if deref:
        search = os.path.realpath(search)

      def ascend():
        nonlocal search
        xinfo.append(os.path.basename(search))
        search = os.path.dirname(search)

      try:
        stab = os.lstat(search)
      except FileNotFoundError:
        return
      if stat.S_ISREG(stab.st_mode):
        ascend()

      while not os.path.ismount(search):
        if s.src_likeparent(search):
          xinfo.reverse()
          if len(xinfo): infol.append('want=' + os.path.join(*xinfo))
          return search

        ascend()

    # no .git found anywhere
    return src

  def src_prenormaliser(s, d, infol): # callers may monkey-patch away
    return os.path.join(s.cwd, os.path.abspath(d))

  def srcdir_find_rune(s, d):
    script = s.find_rune_base
    for excl in s.excludes + [s.output_name, s.manifest_name]:
      assert("'" not in excl)
      script += r" \! -name '%s'" % excl
    script += ' -print0'
    return script

  def manifest_append(s, name, infol):
    s._manifest.append((name, ' '.join(infol)))

  def new_output_name(s, nametail, infol):
    s._outcounter += 1
    name = '%04d-%s' % (s._outcounter, nametail)
    s.manifest_append(name, infol)
    return name

  def open_output_fh(s, name, mode):
    return open(os.path.join(s._destdir, name), mode)

  def src_dir(s, d, infol):
    try: name = s._dirmap[d]
    except KeyError: pass
    else:
      s.manifest_append(name, infol)
      return

    if s.show_pathnames: infol.append(d)
    find_rune = s.srcdir_find_rune(d)
    total_rune = s.rune_cpio % find_rune

    name = s.new_output_name('src.cpio', infol)
    s._dirmap[d] = name
    fh = s.open_output_fh(name, 'wb')

    subprocess.run(s.rune_shell + [total_rune],
                   cwd=d,
                   stdin=subprocess.DEVNULL,
                   stdout=fh,
                   restore_signals=True,
                   check=True)
    fh.close()

  def src_indir(s, d, infol):
    d = s.src_prenormaliser(d, infol)
    if not s.src_filter(d): return

    d = s.src_parentfinder(d, infol)
    s.dir(d, infol)

  def report_from_packages_debian(s, files):
    dpkg_S_in = tempfile.TemporaryFile()
    for (file, infols) in files.items():
      assert('\n' not in file)
      dpkg_S_in.write(file)
      dpkg_S_in.write('\0')
    dpkg_S_in.seek(0)
    cmdl = ['xargs','-0r','dpkg','-S','--']
    dpkg_S = subprocess.Popen(cmdl,
                             cwd='/',
                             stdin=dpkg_S_in,
                             stdout=subprocess.PIPE,
                             close_fds=False)
    dpkg_show_in = tempfile.TemporaryFile()
    pkginfos = { }
    for l in dpkgs.stdout:
      (pkgs, fname) = l.split(': ',1)
      pkgs = pkgs.split(', ')
      for p in pkgs:
        pkginfos[
        print(p, file=dpkg_show_in)

    dpkg-query --show PACKAGE

  def thing_ought_packaged(s, fname):
    return s.thing_matches_globs(fname, s.src_package_globs)

  def src_file_packaged(s, fname);
    try: s._package_files[fname].append(infol)
    except KeyError: s._package_files[fname] = [infol]

  def src_file(s, fname, infol):
    def fngens():
      yield fname
      yield s.path_prenormaliser(fname)
      yield os.path.realpath(fname)

    for fn in fngens():
      if s.thing_ought_packaged(fngen):
        s.src_file_packaged(fname, infol)
        return

    s.src_indir(fname, infol)

  def src_argv0(s, program, infol):
    s.src_file(s, program, infol)

  def src_syspath(s, fname, infol):
    s.src_indir(fname, infol)

  def src_module(s, m, infol):
    try: fname = m.__file__
    except AttributeError: return
    infol.append(m.__name__)

    if s.thing_ought_packaged(fname):
      s.src_file_packaged(fname, infol)
    else:
      s.src_indir(s, fname)

  def srcs_allitems(s, dirs=sys.path):
    s.src_argv0(sys.argv[0], ['argv[0]'])
    for d in sys.path:
      s.src_syspath(d, ['sys.path'])
    for m in sys.modules.values():
      s.src_module(m, ['sys.modules'])
    s.report_from_packages(s, s._package_files)

  def mk_portmanteau(s):
    cmdl = s.rune_shell + [ s.rune_portmanteau, 'x',
                            s.output_name, s.manifest_name ]
    mfh = s.open_output_fh(s.manifest_name,'w')
    for (name, info) in s._manifest:
      if name is not None: cmdl.append(name)
      print('%s\t%s' % (name,info), file=mfh)
    mfh.close()
    subprocess.run(cmdl,
                   cwd=s._destdir,
                   stdin=subprocess.DEVNULL,
                   stdout=sys.stderr,
                   restore_signals=True,
                   check=True)

  def generate(s):
    s.srcs_allitems()
    s.mk_portmanteau()