view tests/f @ 44651:00e0c5c06ed5

pycompat: change argv conversion semantics

Use of os.fsencode() to convert Python's sys.argv back to bytes
was not correct because it isn't the logically inverse operation
from what CPython was doing under the hood.

This commit changes the logic for doing the str -> bytes
conversion. This required a separate implementation for
POSIX and Windows.

The Windows behavior is arguably not ideal. The previous
behavior on Windows was leading to failing tests, such as
test-http-branchmap.t, which defines a utf-8 branch name
via a command argument. Previously, Mercurial's argument
parser looked to be receiving wchar_t bytes in some cases.
After this commit, behavior on Windows is compatible with
Python 2, where CPython did not implement `int wmain()` and
Windows was performing a Unicode to ANSI conversion on the
wchar_t native command line.

Arguably better behavior on Windows would be for Mercurial to
preserve the original Unicode sequence coming from Python and
to wrap this in a bytes-like type so we can round trip safely.
But, this would be new, backwards incompatible behavior. My
goal for this commit was to converge Mercurial behavior on
Python 3 on Windows to fix busted tests. And I believe I was
successful, as this commit fixes 9 tests on my Windows
machine and 14 tests in the AWS CI environment!

Differential Revision: https://phab.mercurial-scm.org/D8337

#!/usr/bin/env python

"""
Utility for inspecting files in various ways.

This tool is like the collection of tools found in a unix environment but are
cross platform and stable and suitable for our needs in the test suite.

This can be used instead of tools like:
  [
  dd
  find
  head
  hexdump
  ls
  md5sum
  readlink
  sha1sum
  stat
  tail
  test
  readlink.py
  md5sum.py
"""

from __future__ import absolute_import

import binascii
import glob
import hashlib
import optparse
import os
import re
import sys

# Python 3 adapters
ispy3 = sys.version_info[0] >= 3
if ispy3:

    def iterbytes(s):
        for i in range(len(s)):
            yield s[i : i + 1]


else:
    iterbytes = iter


def visit(opts, filenames, outfile):
    """Process filenames in the way specified in opts, writing output to
    outfile."""
    for f in sorted(filenames):
        isstdin = f == '-'
        if not isstdin and not os.path.lexists(f):
            outfile.write(b'%s: file not found\n' % f.encode('utf-8'))
            continue
        quiet = opts.quiet and not opts.recurse or isstdin
        isdir = os.path.isdir(f)
        islink = os.path.islink(f)
        isfile = os.path.isfile(f) and not islink
        dirfiles = None
        content = None
        facts = []
        if isfile:
            if opts.type:
                facts.append(b'file')
            if any((opts.hexdump, opts.dump, opts.md5, opts.sha1, opts.sha256)):
                with open(f, 'rb') as fobj:
                    content = fobj.read()
        elif islink:
            if opts.type:
                facts.append(b'link')
            content = os.readlink(f).encode('utf8')
        elif isstdin:
            content = getattr(sys.stdin, 'buffer', sys.stdin).read()
            if opts.size:
                facts.append(b'size=%d' % len(content))
        elif isdir:
            if opts.recurse or opts.type:
                dirfiles = glob.glob(f + '/*')
                facts.append(b'directory with %d files' % len(dirfiles))
        elif opts.type:
            facts.append(b'type unknown')
        if not isstdin:
            stat = os.lstat(f)
            if opts.size and not isdir:
                facts.append(b'size=%d' % stat.st_size)
            if opts.mode and not islink:
                facts.append(b'mode=%o' % (stat.st_mode & 0o777))
            if opts.links:
                facts.append(b'links=%d' % stat.st_nlink)
            if opts.newer:
                # mtime might be in whole seconds so newer file might be same
                if stat.st_mtime >= os.stat(opts.newer).st_mtime:
                    facts.append(
                        b'newer than %s' % opts.newer.encode('utf8', 'replace')
                    )
                else:
                    facts.append(
                        b'older than %s' % opts.newer.encode('utf8', 'replace')
                    )
        if opts.md5 and content is not None:
            h = hashlib.md5(content)
            facts.append(b'md5=%s' % binascii.hexlify(h.digest())[: opts.bytes])
        if opts.sha1 and content is not None:
            h = hashlib.sha1(content)
            facts.append(
                b'sha1=%s' % binascii.hexlify(h.digest())[: opts.bytes]
            )
        if opts.sha256 and content is not None:
            h = hashlib.sha256(content)
            facts.append(
                b'sha256=%s' % binascii.hexlify(h.digest())[: opts.bytes]
            )
        if isstdin:
            outfile.write(b', '.join(facts) + b'\n')
        elif facts:
            outfile.write(b'%s: %s\n' % (f.encode('utf-8'), b', '.join(facts)))
        elif not quiet:
            outfile.write(b'%s:\n' % f.encode('utf-8'))
        if content is not None:
            chunk = content
            if not islink:
                if opts.lines:
                    if opts.lines >= 0:
                        chunk = b''.join(chunk.splitlines(True)[: opts.lines])
                    else:
                        chunk = b''.join(chunk.splitlines(True)[opts.lines :])
                if opts.bytes:
                    if opts.bytes >= 0:
                        chunk = chunk[: opts.bytes]
                    else:
                        chunk = chunk[opts.bytes :]
            if opts.hexdump:
                for i in range(0, len(chunk), 16):
                    s = chunk[i : i + 16]
                    outfile.write(
                        b'%04x: %-47s |%s|\n'
                        % (
                            i,
                            b' '.join(b'%02x' % ord(c) for c in iterbytes(s)),
                            re.sub(b'[^ -~]', b'.', s),
                        )
                    )
            if opts.dump:
                if not quiet:
                    outfile.write(b'>>>\n')
                outfile.write(chunk)
                if not quiet:
                    if chunk.endswith(b'\n'):
                        outfile.write(b'<<<\n')
                    else:
                        outfile.write(b'\n<<< no trailing newline\n')
        if opts.recurse and dirfiles:
            assert not isstdin
            visit(opts, dirfiles, outfile)


if __name__ == "__main__":
    parser = optparse.OptionParser("%prog [options] [filenames]")
    parser.add_option(
        "-t",
        "--type",
        action="store_true",
        help="show file type (file or directory)",
    )
    parser.add_option(
        "-m", "--mode", action="store_true", help="show file mode"
    )
    parser.add_option(
        "-l", "--links", action="store_true", help="show number of links"
    )
    parser.add_option(
        "-s", "--size", action="store_true", help="show size of file"
    )
    parser.add_option(
        "-n", "--newer", action="store", help="check if file is newer (or same)"
    )
    parser.add_option(
        "-r", "--recurse", action="store_true", help="recurse into directories"
    )
    parser.add_option(
        "-S",
        "--sha1",
        action="store_true",
        help="show sha1 hash of the content",
    )
    parser.add_option(
        "",
        "--sha256",
        action="store_true",
        help="show sha256 hash of the content",
    )
    parser.add_option(
        "-M", "--md5", action="store_true", help="show md5 hash of the content"
    )
    parser.add_option(
        "-D", "--dump", action="store_true", help="dump file content"
    )
    parser.add_option(
        "-H", "--hexdump", action="store_true", help="hexdump file content"
    )
    parser.add_option(
        "-B", "--bytes", type="int", help="number of characters to dump"
    )
    parser.add_option(
        "-L", "--lines", type="int", help="number of lines to dump"
    )
    parser.add_option(
        "-q", "--quiet", action="store_true", help="no default output"
    )
    (opts, filenames) = parser.parse_args(sys.argv[1:])
    if not filenames:
        filenames = ['-']

    visit(opts, filenames, getattr(sys.stdout, 'buffer', sys.stdout))