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Replace custom basename implementations with filepathlite.Base across
all relevant os/stat files to unify path processing across platforms.
Change-Id: I7c4795661926949bae71e66d8b4f9363e7caef15
GitHub-Last-Rev: 1236e93ebcd4137f9cbbbab2163cadf4e4d02674
GitHub-Pull-Request: golang/go#67195
Reviewed-on: https://go-review.googlesource.com/c/go/+/583415
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
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It is better to have a single implementation of IsAbs, which is quite
tricky to get right on Windows.
Change-Id: I45933b0ceff2920d9eddb61e62aacb2602c3dc8c
Reviewed-on: https://go-review.googlesource.com/c/go/+/582498
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Fixes #66215
Change-Id: Id7de15feabe08f66c048dc114c09494813c9febc
Reviewed-on: https://go-review.googlesource.com/c/go/+/570695
Reviewed-by: Cherry Mui <cherryyz@google.com>
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This CL changes the behavior of os.Lstat to stop setting the
os.ModeSymlink type mode bit for mount points on Windows. As a result,
filepath.EvalSymlinks no longer evaluates mount points, which was the
cause of many inconsistencies and bugs.
Additionally, os.Lstat starts setting the os.ModeIrregular type mode bit
for all reparse tags on Windows, except for those that are explicitly
supported by the os package, which, since this CL, doesn't include mount
points. This helps to identify files that need special handling outside
of the os package.
This behavior is controlled by the `winsymlink` GODEBUG setting.
For Go 1.23, it defaults to `winsymlink=1`.
Previous versions default to `winsymlink=0`.
Fixes #39786
Fixes #40176
Fixes #61893
Updates #63703
Updates #40180
Updates #63429
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Change-Id: I2e7372ab8862f5062667d30db6958d972bce5407
Reviewed-on: https://go-review.googlesource.com/c/go/+/565136
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The stat function is quite long on Windows. Simplify it a bit by
factoring out the creation of a fileStat from a Win32FileAttributeData.
This also makes it more consistent with the creation of fileStats
from other sources, which all have their own dedicated functions.
Change-Id: I0443f96d892b70ce7f3b5e92c5049e4e4a240c6c
Reviewed-on: https://go-review.googlesource.com/c/go/+/566435
Reviewed-by: Carlos Amedee <carlos@golang.org>
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os.Stat and os.Lstat on Windows use GetFileInformationByHandleEx to
retrieve file information for reparse points and files that
GetFileAttributesEx does not handle.
However, GetFileInformationByHandleEx is only necessary for
reparse points, so we can avoid the call for regular files.
With this change we can drop the FAT hack that was added in CL 154377,
as files won't have the FILE_ATTRIBUTE_REPARSE_POINT attribute set
on that file system.
Change-Id: Id18639067a6c3fa1bb2c6706d5b79358c224fe37
Reviewed-on: https://go-review.googlesource.com/c/go/+/566397
Reviewed-by: Carlos Amedee <carlos@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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Unix sockets are identified by the IO_REPARSE_TAG_AF_UNIX reparse tag.
Teach fileStat.Mode() to recognize this tag and set the os.ModeSocket
bit in such case.
Note that there is a bug starting in Windows 19H1 until 20H1 that
makes the IO_REPARSE_TAG_AF_UNIX tag not being set for unix sockets.
This CL doesn't provide a workaround for this bug.
Fixes #33357.
Change-Id: Iea8f24b20672c8d4b03f55ef298d128431dc3fac
Reviewed-on: https://go-review.googlesource.com/c/go/+/561937
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Prior to CL 460595, Lstat reported most reparse points as regular
files. However, reparse points can in general implement unusual
behaviors (consider IO_REPARSE_TAG_AF_UNIX or IO_REPARSE_TAG_LX_CHR),
and Windows allows arbitrary user-defined reparse points, so in
general we must not assume that an unrecognized reparse tag represents
a regular file; in CL 460595, we began marking them as irregular.
As it turns out, the Data Deduplication service on Windows Server runs
an Optimization job that turns regular files into reparse files with
the tag IO_REPARSE_TAG_DEDUP. Those files still behave more-or-less
like regular files, in that they have well-defined sizes and support
random-access reads and writes, so most programs can treat them as
regular files without difficulty. However, they are still reparse
files: as a result, on servers with the Data Deduplication service
enabled, files could arbitrarily change from “regular” to “irregular”
without explicit user intervention.
Since dedup files are converted in the background and otherwise behave
like regular files, this change adds a special case to report DEDUP
reparse points as regular.
Fixes #63429.
No test because to my knowledge we don't have any Windows builders
that have the deduplication service enabled, nor do we have a way to
reliably guarantee the existence of an IO_REPARSE_TAG_DEDUP file.
(In theory we could add a builder with the service enabled on a
specific volume, write a test that encodes knowledge of that volume,
and use the GO_BUILDER_NAME environment variable to run that test only
on the specially-configured builders. However, I don't currently have
the bandwidth to reconfigure the builders in this way, and given the
simplicity of the change I think it is unlikely to regress
accidentally.)
Change-Id: I649e7ef0b67e3939a980339ce7ec6a20b31b23a1
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Some file systems do not support file IDs. We should not use
FILE_ID_BOTH_DIR_INFO when reading directories on these file systems,
as it will fail. Instead, we should use FILE_ID_FULL_DIR_INFO,
which doesn't require file ID support.
Fixes #61907
Fixes #61918
Change-Id: I83d0a898f8eb254dffe5b8fc68a4ca4ef21c0d85
Reviewed-on: https://go-review.googlesource.com/c/go/+/518195
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Previously, os.Stat only followed IO_REPARSE_TAG_SYMLINK
and IO_REPARSE_TAG_MOUNT_POINT reparse points.
This CL generalize the logic to detect which reparse points to follow
by using the reparse tag value to determine whether the reparse point
refers to another named entity, as documented in
https://learn.microsoft.com/en-us/windows/win32/fileio/reparse-point-tags.
The new behavior adds implicit support for correctly stat-ing reparse
points other than mount points and symlinks, e.g.,
IO_REPARSE_TAG_WCI_LINK and IO_REPARSE_TAG_IIS_CACHE.
Updates #42184
Change-Id: I51f56127d4dc6c0f43eb5dfa3bfa6d9e3922d000
Reviewed-on: https://go-review.googlesource.com/c/go/+/516555
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This CL updates File.readdir() on windows so it uses
GetFileInformationByHandleEx with FILE_ID_BOTH_DIR_INFO
instead of Find* APIs. The former is more performant because
it allows us to buffer IO calls and reduces the number of system calls,
passing from 1 per file to 1 every ~100 files
(depending on the size of the file name and the size of the buffer).
This change improve performance of File.ReadDir by 20-30%.
name old time/op new time/op delta
ReadDir-12 562µs ±14% 385µs ± 9% -31.60% (p=0.000 n=9+9)
name old alloc/op new alloc/op delta
ReadDir-12 29.7kB ± 0% 29.5kB ± 0% -0.88% (p=0.000 n=8+10)
name old allocs/op new allocs/op delta
ReadDir-12 399 ± 0% 397 ± 0% -0.50% (p=0.000 n=10+10)
This change also speeds up calls to os.SameFile when using FileStats
returned from File.readdir(), as their file ID can be inferred while
reading the directory.
Change-Id: Id56a338ee66c39656b564105cac131099218fb5d
Reviewed-on: https://go-review.googlesource.com/c/go/+/452995
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Prior to this change (as of CL 143578), our stat function attempted to
resolve all reparse points as if they were symlinks.
This results in an additional call to CreateFile when statting a
symlink file: we use CreateFile once to obtain the reparse tag and
check whether the file is actually a symlink, and if it is we call
CreateFile again without FILE_FLAG_OPEN_REPARSE_POINT to stat the link
target. Fortunately, since symlinks are rare on Windows that overhead
shouldn't be a big deal in practice.
Fixes #42919.
Change-Id: If453930c6e98040cd6525ac4aea60a84498c9579
Reviewed-on: https://go-review.googlesource.com/c/go/+/460595
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Some file operations, notably Stat and Mkdir, special cased their
behavior when operating on a file named "NUL" (case-insensitive).
This check failed to account for the many other names of the NUL
device, as well as other non-NUL device files: "./nul", "//./nul",
"nul.txt" (on some Windows versions), "con", etc.
Remove the special case.
os.Mkdir("NUL") now returns no error. This is consonant with the
operating system's behavior: CreateDirectory("NUL") succeeds, as
does "MKDIR NUL" on the command line.
os.Stat("NUL") now follows the existing path for FILE_TYPE_CHAR devices,
returning a FileInfo which correctly reports the file as being a
character device.
os.Stat and os.File.Stat have common elements of their logic unified.
For #24482.
For #24556.
For #56217.
Change-Id: I7e70f45901127c9961166dd6dbfe0c4a10b4ab64
Reviewed-on: https://go-review.googlesource.com/c/go/+/448897
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And then revert the bootstrap cmd directories and certain testdata.
And adjust tests as needed.
Not reverting the changes in std that are bootstrapped,
because some of those changes would appear in API docs,
and we want to use any consistently.
Instead, rewrite 'any' to 'interface{}' in cmd/dist for those directories
when preparing the bootstrap copy.
A few files changed as a result of running gofmt -w
not because of interface{} -> any but because they
hadn't been updated for the new //go:build lines.
Fixes #49884.
Change-Id: Ie8045cba995f65bd79c694ec77a1b3d1fe01bb09
Reviewed-on: https://go-review.googlesource.com/c/go/+/368254
Trust: Russ Cox <rsc@golang.org>
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Necessary to move PathError to io/fs.
For #41190.
Change-Id: I05e87675f38a22f0570d4366b751b6169f7a1b13
Reviewed-on: https://go-review.googlesource.com/c/go/+/243900
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On Windows, GetFileAttributesEx fails with ERROR_SHARING_VIOLATION for
some files, like c:\pagefile.sys. In this case,
newFileStatFromWin32finddata is used to fill file info, but it does not fill
name and path.
After getting file stat from newFileStatFromWin32finddata, just set file info
name and path before return fixes the issue.
Fixes #30883
Change-Id: I654e96c634e8a9bf5ce7e1aaa93968e88953620d
Reviewed-on: https://go-review.googlesource.com/c/go/+/167779
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It appears calling GetFileInformationByHandleEx with
FILE_ATTRIBUTE_TAG_INFO fails on FAT file system. FAT does not
support symlinks, so assume there are no symlnks when
GetFileInformationByHandleEx returns ERROR_INVALID_PARAMETER.
Fixes #29214
Change-Id: If2d9f3288bd99637681ab5fd4e4581c77b578a69
Reviewed-on: https://go-review.googlesource.com/c/154377
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Stat uses Windows FindFirstFile + CreateFile to gather symlink
information - FindFirstFile determines if file is a symlink,
and then CreateFile follows symlink to capture target details.
Lstat only uses FindFirstFile.
This CL replaces current approach with just a call to CreateFile.
Lstat uses FILE_FLAG_OPEN_REPARSE_POINT flag, that instructs
CreateFile not to follow symlink. Other than that both Stat and
Lstat look the same now. New code is simpler.
CreateFile + GetFileInformationByHandle (unlike FindFirstFile)
does not report reparse tag of a file. I tried to ignore reparse
tag altogether. And it works for symlinks and mount points.
Unfortunately (see https://github.com/moby/moby/issues/37026),
files on deduped disk volumes are reported with
FILE_ATTRIBUTE_REPARSE_POINT attribute set and reparse tag set
to IO_REPARSE_TAG_DEDUP. So, if we ignore reparse tag, Lstat
interprets deduped volume files as symlinks. That is incorrect.
So I had to add GetFileInformationByHandleEx call to gather
reparse tag after calling CreateFile and GetFileInformationByHandle.
Fixes #27225
Fixes #27515
Change-Id: If60233bcf18836c147597cc17450d82f3f88c623
Reviewed-on: https://go-review.googlesource.com/c/143578
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SameFile opens file to discover identifier and volume serial
number that uniquely identify the file. SameFile uses Windows
CreateFile API to open the file, and that works well for files
and directories. But CreateFile always follows symlinks, so
SameFile always opens symlink target instead of symlink itself.
This CL uses FILE_FLAG_OPEN_REPARSE_POINT flag to adjust
CreateFile behavior when handling symlinks.
As per https://docs.microsoft.com/en-us/windows/desktop/FileIO/symbolic-link-effects-on-file-systems-functions#createfile-and-createfiletransacted
"... If FILE_FLAG_OPEN_REPARSE_POINT is specified and:
If an existing file is opened and it is a symbolic link, the handle
returned is a handle to the symbolic link. ...".
I also added new tests for both issue #21854 and #27225.
Issue #27225 is still to be fixed, so skipping the test on
windows for the moment.
Fixes #21854
Updates #27225
Change-Id: I8aaa13ad66ce3b4074991bb50994d2aeeeaa7c95
Reviewed-on: https://go-review.googlesource.com/134195
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Fixes #24999
Change-Id: Ie0bb6a6e0fa3992cdd272d42347af65ae7c95463
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os.Stat implementation uses instructions described at
https://blogs.msdn.microsoft.com/oldnewthing/20100212-00/?p=14963/
to distinguish symlinks. In particular, it calls
GetFileAttributesEx or FindFirstFile and checks
either WIN32_FILE_ATTRIBUTE_DATA.dwFileAttributes
or WIN32_FIND_DATA.dwFileAttributes to see if
FILE_ATTRIBUTES_REPARSE_POINT flag is set.
And that seems to worked fine so far.
But now we discovered that OneDrive root folder
is determined as directory:
c:\>dir C:\Users\Alex | grep OneDrive
30/11/2017 07:25 PM <DIR> OneDrive
c:\>
while Go identified it as symlink.
But we did not follow Microsoft's advice to the letter - we never
checked WIN32_FIND_DATA.Reserved0. And adding that extra check
makes Go treat OneDrive as symlink. So use FindFirstFile and
WIN32_FIND_DATA.Reserved0 to determine symlinks.
Fixes #22579
Change-Id: I0cb88929eb8b47b1d24efaf1907ad5a0e20de83f
Reviewed-on: https://go-review.googlesource.com/86556
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Fixes #23123
Change-Id: Ia4ac947cc49ef3d150ef60a095b86552dcef397d
Reviewed-on: https://go-review.googlesource.com/84435
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This CL improves
on my Windows 7
name old time/op new time/op delta
Readdirname 58.1µs ± 1% 58.1µs ± 0% ~ (p=0.817 n=8+8)
Readdir 58.0µs ± 3% 57.8µs ± 0% ~ (p=0.944 n=9+8)
name old alloc/op new alloc/op delta
Readdirname 3.03kB ± 0% 2.84kB ± 0% -6.33% (p=0.000 n=10+10)
Readdir 3.00kB ± 0% 2.81kB ± 0% -6.40% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Readdirname 34.0 ± 0% 30.0 ± 0% -11.76% (p=0.000 n=10+10)
Readdir 33.0 ± 0% 29.0 ± 0% -12.12% (p=0.000 n=10+10)
on my Windows XP
name old time/op new time/op delta
Readdirname-2 85.5µs ± 0% 84.0µs ± 0% -1.83% (p=0.000 n=10+10)
Readdir-2 84.6µs ± 0% 83.5µs ± 0% -1.31% (p=0.000 n=10+9)
name old alloc/op new alloc/op delta
Readdirname-2 6.52kB ± 0% 5.66kB ± 0% -13.25% (p=0.000 n=10+10)
Readdir-2 6.39kB ± 0% 5.53kB ± 0% -13.52% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Readdirname-2 78.0 ± 0% 66.0 ± 0% -15.38% (p=0.000 n=10+10)
Readdir-2 77.0 ± 0% 65.0 ± 0% -15.58% (p=0.000 n=10+10)
Change-Id: I5d698eca86b8e94a46b6cfbd5947898b7b3fbdbd
Reviewed-on: https://go-review.googlesource.com/42894
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When using Lstat against symlinks that point to a directory,
the function returns FileInfo with both ModeDir and ModeSymlink set.
Change that to never set ModeDir if ModeSymlink is set.
Fixes #10424
Fixes #17540
Fixes #17541
Change-Id: Iba280888aad108360b8c1f18180a24493fe7ad2b
Reviewed-on: https://go-review.googlesource.com/41830
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CL 20845 changed Stdin.Stat() so it returns ModeNamedPipe.
But introduced TestStatStdin does not test what Stdin.Stat()
returns when Stdin is console.
This CL adjusts both TestStatStdin and Stdin.Stat
implementations to handle console. Return ModeCharDevice
from Stdin.Stat() when Stdin is console on windows,
just like it does on unix.
Fixes #14853.
Change-Id: I54d73caee2aea45a99618d11600d8e82fe20d0c0
Reviewed-on: https://go-review.googlesource.com/34090
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
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cmd and runtime were handled separately, and I'm intentionally skipped
syscall. This is the rest of the standard library.
CL generated mechanically with github.com/mdempsky/unconvert.
Change-Id: I9e0eff886974dedc37adb93f602064b83e469122
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If name is /dev/{stdin,stdout,stderr}, return fileInfo.
Fixes #14853.
Change-Id: Ibf7d1ae7b9f3dc43f6ed7c905ea2c5102e1971cc
Reviewed-on: https://go-review.googlesource.com/20845
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
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Preparation was in CL 134570043.
This CL contains only the effect of 'hg mv src/pkg/* src'.
For more about the move, see golang.org/s/go14nopkg.
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