aboutsummaryrefslogtreecommitdiff
blob: 77f9fe0213f5397dce19363663905bfdd8359d47 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
#!/usr/bin/env python
# Copyright 2017-2020 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2
#
# Copyright 2017 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Core implementation of doins ebuild helper command.

This script is designed to be executed by ebuild-helpers/doins.
"""

import argparse
import errno
import grp
import logging
import os
import pwd
import shlex
import shutil
import stat
import subprocess
import sys

from portage.util import movefile
from portage.util.file_copy import copyfile

logger = logging.getLogger("portage.bin.doins")


def _warn(helper, msg):
    """Output warning message to stderr.

    Args:
            helper: helper executable name.
            msg: Message to be output.
    """
    print("!!! %s: %s\n" % (helper, msg), file=sys.stderr)


def _parse_group(group):
    """Parses gid.

    Args:
            group: string representation of the group. Maybe name or gid.
    Returns:
            Parsed gid.
    """
    try:
        return grp.getgrnam(group).gr_gid
    except KeyError:
        pass
    return int(group)


def _parse_user(user):
    """Parses uid.

    Args:
            user: string representation of the user. Maybe name or uid.
    Returns:
            Parsed uid.
    """
    try:
        return pwd.getpwnam(user).pw_uid
    except KeyError:
        pass
    return int(user)


def _parse_mode(mode):
    """Parses mode.

    Args:
            mode: string representation of the permission.
    Returns:
            Parsed mode.
    """
    # `install`'s --mode option is complicated. So here is partially
    # supported.
    try:
        return int(mode, 8)
    except ValueError:
        # In case of fail, returns None, so that caller can check
        # if unknown '-m' is set or not.
        return None


def _parse_install_options(
    options, is_strict, helper, inprocess_runner_class, subprocess_runner_class
):
    """Parses command line arguments for `install` command.

    Args:
            options: string representation of `install` options.
            is_strict: bool. If True, this exits the program in case of
                    that an unknown option is found.
            helper: helper executable name.
            inprocess_runner_class: Constructor to run procedure which
                    `install` command will do.
            subprocess_runner_class: Constructor to run `install` command.
    """
    parser = argparse.ArgumentParser()
    parser.add_argument("-g", "--group", default=-1, type=_parse_group)
    parser.add_argument("-o", "--owner", default=-1, type=_parse_user)
    parser.add_argument("-m", "--mode", default=0o755, type=_parse_mode)
    parser.add_argument("-p", "--preserve-timestamps", action="store_true")
    split_options = shlex.split(options)
    namespace, remaining = parser.parse_known_args(split_options)
    # Because parsing '--mode' option is partially supported. If unknown
    # arg for --mode is passed, namespace.mode is set to None.
    if remaining or namespace.mode is None:
        _warn(helper, "Unknown install options: %s, %r" % (options, remaining))
        if is_strict:
            sys.exit(1)
        _warn(
            helper,
            "Continue with falling back to `install` "
            "command execution, which can be slower.",
        )
        return subprocess_runner_class(split_options)
    return inprocess_runner_class(namespace)


def _set_attributes(options, path):
    """Sets attributes the file/dir at given |path|.

    Args:
            options: object which has |owner|, |group| and |mode| fields.
                    |owner| is int value representing uid. Similary |group|
                    represents gid.
                    If -1 is set, just unchanged.
                    |mode| is the bits of permissions.
            path: File/directory path.
    """
    if options.owner != -1 or options.group != -1:
        os.lchown(path, options.owner, options.group)
    if options.mode is not None:
        os.chmod(path, options.mode)


def _set_timestamps(source_stat, dest):
    """Apply timestamps from source_stat to dest.

    Args:
            source_stat: stat result for the source file.
            dest: path to the dest file.
    """
    os.utime(dest, ns=(source_stat.st_atime_ns, source_stat.st_mtime_ns))


class _InsInProcessInstallRunner:
    """Implements `install` command behavior running in a process."""

    def __init__(self, opts, parsed_options):
        """Initializes the instance.

        Args:
                opts: namespace object containing the parsed
                        arguments for this program.
                parsed_options: namespace object contaning the parsed
                        options for `install`.
        """
        self._parsed_options = parsed_options
        self._helper = opts.helper
        self._copy_xattr = opts.enable_copy_xattr
        if self._copy_xattr:
            self._xattr_exclude = opts.xattr_exclude

    def run(self, source, dest_dir):
        """Installs a file at |source| into |dest_dir| in process.

        Args:
                source: Path to the file to be installed.
                dest_dir: Path to the directory which |source| will be
                        installed into.
        Returns:
                True on success, otherwise False.
        """
        dest = os.path.join(dest_dir, os.path.basename(source))
        # Raise an exception if stat(source) fails, intentionally.
        sstat = os.stat(source)
        if not self._is_install_allowed(source, sstat, dest):
            return False

        # To emulate the `install` command, remove the dest file in
        # advance.
        try:
            os.unlink(dest)
        except OSError as e:
            # Removing a non-existing entry should be handled as a
            # regular case.
            if e.errno != errno.ENOENT:
                raise
        try:
            copyfile(source, dest)
            _set_attributes(self._parsed_options, dest)
            if self._copy_xattr:
                movefile._copyxattr(source, dest, exclude=self._xattr_exclude)
            if self._parsed_options.preserve_timestamps:
                _set_timestamps(sstat, dest)
        except Exception:
            logger.exception(
                "Failed to copy file: " "_parsed_options=%r, source=%r, dest_dir=%r",
                self._parsed_options,
                source,
                dest_dir,
            )
            return False
        return True

    def _is_install_allowed(self, source, source_stat, dest):
        """Returns if installing source into dest should work.

        This is to keep compatibility with the `install` command.

        Args:
                source: path to the source file.
                source_stat: stat result for the source file, using stat()
                        rather than lstat(), in order to match the `install`
                        command
                dest: path to the dest file.

        Returns:
                True if it should succeed.
        """
        # To match `install` command, use stat() for source, while
        # lstat() for dest.
        try:
            dest_lstat = os.lstat(dest)
        except OSError as e:
            # It is common to install a file into a new path,
            # so if the destination doesn't exist, ignore it.
            if e.errno == errno.ENOENT:
                return True
            raise

        # Allowing install, if the target is a symlink.
        if stat.S_ISLNK(dest_lstat.st_mode):
            return True

        # Allowing install, if source file and dest file are different.
        # Note that, later, dest will be unlinked.
        if not os.path.samestat(source_stat, dest_lstat):
            return True

        # Allowing install, in hardlink case, if the actual path are
        # different, because source can be preserved even after dest is
        # unlinked.
        if dest_lstat.st_nlink > 1 and os.path.realpath(source) != os.path.realpath(
            dest
        ):
            return True

        _warn(self._helper, "%s and %s are same file." % (source, dest))
        return False


class _InsSubprocessInstallRunner:
    """Runs `install` command in a subprocess to install a file."""

    def __init__(self, split_options):
        """Initializes the instance.

        Args:
                split_options: Command line options to be passed to
                        `install` command. List of str.
        """
        self._split_options = split_options

    def run(self, source, dest_dir):
        """Installs a file at |source| into |dest_dir| by `install`.

        Args:
                source: Path to the file to be installed.
                dest_dir: Path to the directory which |source| will be
                installed into.
        Returns:
                True on success, otherwise False.
        """
        command = ["install"] + self._split_options + [source, dest_dir]
        return subprocess.call(command) == 0


class _DirInProcessInstallRunner:
    """Implements `install` command behavior running in a process."""

    def __init__(self, parsed_options):
        """Initializes the instance.

        Args:
                parsed_options: namespace object contaning the parsed
                        options for `install`.
        """
        self._parsed_options = parsed_options

    def run(self, dest):
        """Installs a dir into |dest| in process.

        Args:
                dest: Path where a directory should be created.
        """
        try:
            os.makedirs(dest)
        except OSError as e:
            if e.errno != errno.EEXIST or not os.path.isdir(dest):
                raise
        _set_attributes(self._parsed_options, dest)


class _DirSubprocessInstallRunner:
    """Runs `install` command to create a directory."""

    def __init__(self, split_options):
        """Initializes the instance.

        Args:
                split_options: Command line options to be passed to
                        `install` command. List of str.
        """
        self._split_options = split_options

    def run(self, dest):
        """Installs a dir into |dest| by `install` command.

        Args:
                dest: Path where a directory should be created.
        """
        command = ["install", "-d"] + self._split_options + [dest]
        subprocess.check_call(command)


class _InstallRunner:
    """Handles `install` command operation.

    Runs operations which `install` command should work. If possible,
    this may just call in-process functions, instead of executing `install`
    in a subprocess for performance.
    """

    def __init__(self, opts):
        """Initializes the instance.

        Args:
                opts: namespace object containing the parsed
                        arguments for this program.
        """
        self._ins_runner = _parse_install_options(
            opts.insoptions,
            opts.strict_option,
            opts.helper,
            lambda options: _InsInProcessInstallRunner(opts, options),
            _InsSubprocessInstallRunner,
        )
        self._dir_runner = _parse_install_options(
            opts.diroptions,
            opts.strict_option,
            opts.helper,
            _DirInProcessInstallRunner,
            _DirSubprocessInstallRunner,
        )
        self._helpers_can_die = opts.helpers_can_die

    def install_file(self, source, dest_dir):
        """Installs a file at |source| into |dest_dir| directory.

        Args:
                source: Path to the file to be installed.
                dest_dir: Path to the directory which |source| will be
                        installed into.
        Returns:
                True on success, otherwise False.
        """
        return self._ins_runner.run(source, dest_dir)

    def install_dir(self, dest):
        """Creates a directory at |dest|.

        Args:
                dest: Path where a directory should be created.
        """
        try:
            self._dir_runner.run(dest)
        except Exception:
            if self._helpers_can_die:
                raise
            logger.exception("install_dir failed.")


def _doins(opts, install_runner, relpath, source_root):
    """Installs a file as if `install` command runs.

    Installs a file at |source_root|/|relpath| into
    |opts.dest|/|relpath|.
    If |args.preserve_symlinks| is set, creates symlink if the source is a
    symlink.

    Args:
            opts: parsed arguments. It should have following fields.
                    - preserve_symlinks: bool representing whether symlinks
                            needs to be preserved.
                    - dest: Destination root directory.
                    - distdir: location where Portage stores the downloaded
                            source code archives.
            install_runner: _InstallRunner instance for file install.
            relpath: Relative path of the file being installed.
            source_root: Source root directory.

    Returns: True on success.
    """
    source = os.path.join(source_root, relpath)
    dest = os.path.join(opts.dest, relpath)
    if os.path.islink(source):
        # Our fake ${DISTDIR} contains symlinks that should not be
        # reproduced inside ${D}. In order to ensure that things like
        # dodoc "${DISTDIR}"/foo.pdf work as expected, we dereference
        # symlinked files that refer to absolute paths inside
        # ${PORTAGE_ACTUAL_DISTDIR}/.
        try:
            if opts.preserve_symlinks and not os.readlink(source).startswith(
                opts.distdir
            ):
                linkto = os.readlink(source)
                try:
                    os.unlink(dest)
                except OSError as e:
                    if e.errno == errno.EISDIR:
                        shutil.rmtree(dest, ignore_errors=True)
                os.symlink(linkto, dest)
                return True
        except Exception:
            logger.exception(
                "Failed to create symlink: " "opts=%r, relpath=%r, source_root=%r",
                opts,
                relpath,
                source_root,
            )
            return False

    return install_runner.install_file(source, os.path.dirname(dest))


def _create_arg_parser():
    """Returns the parser for the command line arguments."""
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument(
        "--recursive",
        action="store_true",
        help="If set, installs files recursively. Otherwise, "
        "just skips directories.",
    )
    parser.add_argument(
        "--preserve_symlinks",
        action="store_true",
        help="If set, a symlink will be installed as symlink.",
    )
    parser.add_argument(
        "--helpers_can_die",
        action="store_true",
        help="If set, die in isolated-functions.sh is enabled. "
        "Specifically this is used to keep compatible dodir's "
        "behavior.",
    )
    parser.add_argument("--distdir", default="", help="Path to the actual distdir.")
    parser.add_argument(
        "--insoptions",
        default="",
        help="Options passed to `install` command for installing a " "file.",
    )
    parser.add_argument(
        "--diroptions",
        default="",
        help="Options passed to `install` command for installing a " "dir.",
    )
    parser.add_argument(
        "--strict_option",
        action="store_true",
        help="If set True, abort if insoptions/diroptions contains an "
        "option which cannot be interpreted by this script, instead of "
        "fallback to execute `install` command.",
    )
    parser.add_argument(
        "--enable_copy_xattr", action="store_true", help="Copies xattrs, if set True"
    )
    parser.add_argument(
        "--xattr_exclude",
        default="",
        help="White space delimited glob pattern to exclude xattr copy."
        "Used only if --enable_xattr_copy is set.",
    )

    # If helper is dodoc, it changes the behavior for the directory
    # install without --recursive.
    parser.add_argument("--helper", help="Name of helper.")
    parser.add_argument("--dest", help="Destination where the files are installed.")
    parser.add_argument(
        "sources", nargs="*", help="Source file/directory paths to be installed."
    )

    return parser


def _parse_args(argv):
    """Parses the command line arguments.

    Args:
            argv: command line arguments to be parsed.
    Returns:
            namespace instance containing the parsed argument data.
    """
    parser = _create_arg_parser()
    opts = parser.parse_args(argv)

    # Encode back to the original byte stream. Please see
    # http://bugs.python.org/issue8776.
    opts.distdir = os.fsencode(opts.distdir) + b"/"
    opts.dest = os.fsencode(opts.dest)
    opts.sources = [os.fsencode(source) for source in opts.sources]

    return opts


def _install_dir(opts, install_runner, source):
    """Installs directory at |source|.

    Args:
            opts: namespace instance containing parsed command line
                    argument data.
            install_runner: _InstallRunner instance for dir install.
            source: Path to the source directory.
    Returns:
            True on success, False on failure, or None on skipped.
    """
    if not opts.recursive:
        if opts.helper == "dodoc":
            _warn(opts.helper, "%s is a directory" % (source,))
            return False
        # Neither success nor fail. Return None to indicate skipped.
        return None

    # Strip trailing '/'s.
    source = source.rstrip(b"/")
    source_root = os.path.dirname(source)
    dest_dir = os.path.join(opts.dest, os.path.basename(source))
    install_runner.install_dir(dest_dir)

    relpath_list = []
    for dirpath, dirnames, filenames in os.walk(source):
        for dirname in dirnames:
            source_dir = os.path.join(dirpath, dirname)
            relpath = os.path.relpath(source_dir, source_root)
            if os.path.islink(source_dir):
                # If this is a symlink, it will be processed
                # in _doins() called later.
                relpath_list.append(relpath)
            else:
                dest = os.path.join(opts.dest, relpath)
                install_runner.install_dir(dest)
        relpath_list.extend(
            os.path.relpath(os.path.join(dirpath, filename), source_root)
            for filename in filenames
        )

    if not relpath_list:
        # NOTE: Even if only an empty directory is installed here, it
        # still counts as success, since an empty directory given as
        # an argument to doins -r should not trigger failure.
        return True
    success = True
    for relpath in relpath_list:
        if not _doins(opts, install_runner, relpath, source_root):
            success = False
    return success


def main(argv):
    opts = _parse_args(argv)
    install_runner = _InstallRunner(opts)

    if not os.path.isdir(opts.dest):
        install_runner.install_dir(opts.dest)

    any_success = False
    any_failure = False
    for source in opts.sources:
        if os.path.isdir(source) and (
            not opts.preserve_symlinks or not os.path.islink(source)
        ):
            ret = _install_dir(opts, install_runner, source)
            if ret is None:
                continue
            if ret:
                any_success = True
            else:
                any_failure = True
        else:
            if _doins(
                opts, install_runner, os.path.basename(source), os.path.dirname(source)
            ):
                any_success = True
            else:
                any_failure = True

    return 0 if not any_failure and any_success else 1


if __name__ == "__main__":
    sys.exit(main(sys.argv[1:]))