tests/f
author Pierre-Yves David <pierre-yves.david@ens-lyon.org>
Wed, 12 Apr 2017 16:34:05 +0200
changeset 32031 11a2461fc9b1
parent 29233 318534bb5dfd
child 32898 c425b678df7c
permissions -rwxr-xr-x
upgrade: move descriptions and selection logic in individual classes Our goal here is to get top level definition for all the format variants. Having them defined outside of the function enabled other users of that logic. They are two keys components of a format variant: 1) the name and various descriptions of its effect, 2) the code that checks if the repo is using this variant and if the config enables it. That second items make us pick a class-based approach, since different variants requires different code (even if in practice, many can reuse the same logic). Each variants define its own class that is then used like a singleton. The class-based approach also clarify the definitions part a bit since each are simple assignment in an indented block. The 'fromdefault' and 'fromconfig' are respectively replaced by a class attribute and a method to be called at the one place where "fromconfig" matters. Overall, they are many viable approach for this, but this is the one I picked.
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#!/usr/bin/env python
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"""
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Utility for inspecting files in various ways.
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This tool is like the collection of tools found in a unix environment but are
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cross platform and stable and suitable for our needs in the test suite.
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This can be used instead of tools like:
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  [
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  dd
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  find
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  head
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  hexdump
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  ls
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  md5sum
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  readlink
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  sha1sum
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  stat
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  tail
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  test
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  readlink.py
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  md5sum.py
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"""
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from __future__ import absolute_import
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import glob
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import hashlib
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import optparse
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import os
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import re
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import sys
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def visit(opts, filenames, outfile):
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    """Process filenames in the way specified in opts, writing output to
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    outfile."""
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    for f in sorted(filenames):
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        isstdin = f == '-'
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        if not isstdin and not os.path.lexists(f):
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            outfile.write('%s: file not found\n' % f)
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            continue
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        quiet = opts.quiet and not opts.recurse or isstdin
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        isdir = os.path.isdir(f)
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        islink = os.path.islink(f)
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        isfile = os.path.isfile(f) and not islink
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        dirfiles = None
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        content = None
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        facts = []
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        if isfile:
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            if opts.type:
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                facts.append('file')
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            if opts.hexdump or opts.dump or opts.md5:
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                content = file(f, 'rb').read()
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        elif islink:
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            if opts.type:
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                facts.append('link')
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            content = os.readlink(f)
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        elif isstdin:
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            content = sys.stdin.read()
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            if opts.size:
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                facts.append('size=%s' % len(content))
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        elif isdir:
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            if opts.recurse or opts.type:
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                dirfiles = glob.glob(f + '/*')
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                facts.append('directory with %s files' % len(dirfiles))
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        elif opts.type:
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            facts.append('type unknown')
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        if not isstdin:
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            stat = os.lstat(f)
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            if opts.size and not isdir:
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                facts.append('size=%s' % stat.st_size)
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            if opts.mode and not islink:
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                facts.append('mode=%o' % (stat.st_mode & 0o777))
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            if opts.links:
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                facts.append('links=%s' % stat.st_nlink)
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            if opts.newer:
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                # mtime might be in whole seconds so newer file might be same
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                if stat.st_mtime >= os.stat(opts.newer).st_mtime:
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                    facts.append('newer than %s' % opts.newer)
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                else:
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                    facts.append('older than %s' % opts.newer)
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        if opts.md5 and content is not None:
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            h = hashlib.md5(content)
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            facts.append('md5=%s' % h.hexdigest()[:opts.bytes])
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        if opts.sha1 and content is not None:
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            h = hashlib.sha1(content)
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            facts.append('sha1=%s' % h.hexdigest()[:opts.bytes])
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        if isstdin:
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            outfile.write(', '.join(facts) + '\n')
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        elif facts:
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            outfile.write('%s: %s\n' % (f, ', '.join(facts)))
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        elif not quiet:
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            outfile.write('%s:\n' % f)
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        if content is not None:
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            chunk = content
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            if not islink:
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                if opts.lines:
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                    if opts.lines >= 0:
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                        chunk = ''.join(chunk.splitlines(True)[:opts.lines])
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                    else:
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                        chunk = ''.join(chunk.splitlines(True)[opts.lines:])
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                if opts.bytes:
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                    if opts.bytes >= 0:
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                        chunk = chunk[:opts.bytes]
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                    else:
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                        chunk = chunk[opts.bytes:]
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            if opts.hexdump:
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                for i in range(0, len(chunk), 16):
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                    s = chunk[i:i + 16]
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                    outfile.write('%04x: %-47s |%s|\n' %
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                                  (i, ' '.join('%02x' % ord(c) for c in s),
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                                   re.sub('[^ -~]', '.', s)))
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            if opts.dump:
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                if not quiet:
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                    outfile.write('>>>\n')
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                outfile.write(chunk)
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                if not quiet:
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                    if chunk.endswith('\n'):
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                        outfile.write('<<<\n')
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                    else:
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                        outfile.write('\n<<< no trailing newline\n')
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        if opts.recurse and dirfiles:
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            assert not isstdin
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            visit(opts, dirfiles, outfile)
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if __name__ == "__main__":
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    parser = optparse.OptionParser("%prog [options] [filenames]")
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    parser.add_option("-t", "--type", action="store_true",
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                      help="show file type (file or directory)")
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    parser.add_option("-m", "--mode", action="store_true",
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                      help="show file mode")
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    parser.add_option("-l", "--links", action="store_true",
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                      help="show number of links")
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    parser.add_option("-s", "--size", action="store_true",
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                      help="show size of file")
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    parser.add_option("-n", "--newer", action="store",
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                      help="check if file is newer (or same)")
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    parser.add_option("-r", "--recurse", action="store_true",
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                      help="recurse into directories")
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    parser.add_option("-S", "--sha1", action="store_true",
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                      help="show sha1 hash of the content")
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    parser.add_option("-M", "--md5", action="store_true",
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                      help="show md5 hash of the content")
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    parser.add_option("-D", "--dump", action="store_true",
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                      help="dump file content")
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    parser.add_option("-H", "--hexdump", action="store_true",
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                      help="hexdump file content")
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    parser.add_option("-B", "--bytes", type="int",
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                      help="number of characters to dump")
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    parser.add_option("-L", "--lines", type="int",
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                      help="number of lines to dump")
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    parser.add_option("-q", "--quiet", action="store_true",
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                      help="no default output")
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    (opts, filenames) = parser.parse_args(sys.argv[1:])
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    if not filenames:
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        filenames = ['-']
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    visit(opts, filenames, sys.stdout)