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Eryk Sun added the comment:
It's not completely surprising that attempting to traverse a name-surrogate
reparse point under "%UserProfile%\AppData" fails when using the store app. If
you can't or won't move the mountpoint up to %UserProfile%, or anywhere else
outsid
Eryk Sun added the comment:
> I also don't actually see gdi32 being transitively loaded as
> claimed in the Twitter thread, even back to 3.8. So presumably
> there's something else going on to cause that issue.
Since Windows XP, shlwapi.dll has increasingly made use of del
Eryk Sun added the comment:
> does this or does this not look to you like a bug in CPython?
It's better to leave the detailed explanation of limits up to the document
that's referenced for further information [1], but this issue isn't even
briefly mentioned there. Maybe
Eryk Sun added the comment:
Interactive mode isn't automatically enabled when stdin isn't a tty, so the
interpreter tries to read all of stdin, until the result is empty (i.e. EOF).
You can force interactive mode with the -i command-line option. The example
would also benefit fr
Eryk Sun added the comment:
Apparently -R is still implemented in Python 3, even though hash randomization
is enabled by default now. Unlike Python 2, in Python 3 -R overrides the
PYTHONHASHSEED environment variable, making it effectively the same as
"PYTHONHASHSEED=random". F
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Eryk Sun added the comment:
Either the documentation [1] or the behavior needs to be fixed. The following
statement is false:
Turn on hash randomization. This option only has an effect if the
PYTHONHASHSEED environment variable is set to 0, since hash
randomization is enabled by
Eryk Sun added the comment:
All we can do here is document the store app's limitation on cross-volume
reparse points (junctions, symlinks) in "%UserProfile%\AppData". I suppose it's
a rare enough problem that it can just be closed as a third-party issue.
--
reso
Eryk Sun added the comment:
The embedded manifest in python[_d].exe is missing, so the process is running
with Windows 8 compatibility mode (i.e. 6.2.9200), and thus the check for
Windows 11+ (10.0.22000+) is false. It's disappointing that compatibility mode
doesn't restore t
Eryk Sun added the comment:
It would also work to add RT_MANIFEST=24 to the ResourceCompile
PreprocessorDefinitions in PCbuild\pyproject.props. Though to me, adding the
definition there is obscure compared to including a private header, such as
"resourcet
Eryk Sun added the comment:
Steve, instead of manually defining RT_MANIFEST, try including "winresrc.h" in
the resource definition files. This SDK header includes "winuser.rh" (note the
".rh" extension), which, among other things, includes the followin
Eryk Sun added the comment:
Also, I suggest using CREATEPROCESS_MANIFEST_RESOURCE_ID (1) and
ISOLATIONAWARE_MANIFEST_RESOURCE_ID (2) instead of hard-coded resource IDs.
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Eryk Sun added the comment:
Ensure that the system has LongPathsEnabled set to 1. For example, in
PowerShell with administrator (elevated) access:
PS C:\> $p = "HKLM:\System\CurrentControlSet\Control\Filesystem"
PS C:\> get-itempropertyvalue $p LongPathsEnabled
0
Eryk Sun added the comment:
> Did my accidental breakage of the resource files make it
> into the last 3.9 release?
Yep, version 3.9.8 of the store app was built last Friday, the day after
removing "winuser.h" from the resource definition files. I just installed it
and
Eryk Sun added the comment:
> How are you checking whether it's there or not?
The desktop distribution of 3.9.8 is the most obvious case, since it causes
sys.getwindowsversion() to report Windows 8.0 (6.2.9200):
C:\Temp>"C:\Program Files\Python39\python.exe"
Eryk Sun added the comment:
> It fails with "The system cannot find the file
> C:\Users\\AppData\Local\Microsoft\WindowsApps\python3.9.exe."
The shell's CreateProcessW() call failed with ERROR_FILE_NOT_FOUND (2). The
file exists, but it's probably a broken app
Change by Eryk Sun :
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Eryk Sun added the comment:
> Could it be possible that it might not be able to replace that
> link when it is currently in use?
Appexec links are only used briefly to find the real executable and create the
access token that allows executing it. I don't know how your lo
Eryk Sun added the comment:
> The python3.9.exe file in the WindowsApps folder looks like
> a real executable and not a link.
As requested, and as shown in the output, you tested the file in Python 3.9's
subdirectory of "WindowsApps", not in "WindowsApps" i
Eryk Sun added the comment:
> Also all those files are 0 bytes - even the working ones.
The files should have no data, just appexec links. It's just an empty file if
there's no link set.
> Since I cannot even run the actual executable there seems to be
> an issue with
Eryk Sun added the comment:
> Which doc is wrong?
Currently -R overrides a non-zero seed value in PYTHONHASHSEED. The behavior
changed in 3.7. Either the docs or the behavior need to be fixed. To repeat my
previous example (this time in Windows):
C:\>set PYTHONHASHSEED=37
Eryk Sun added the comment:
> perfectly valid redirected paths (winfsp ram drives for example)
I mounted a WinFsp MEMFS filesystem on a directory, which set a mountpoint that
targets the root path of a volume device in the native "\Device" object
directory. It didn't cr
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Eryk Sun added the comment:
How about this?
Enable hash randomization. This option overrides PYTHONHASHSEED
to use the default behavior.
--
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Eryk Sun added the comment:
Zackery, here's an initial draft implementation for Windows 10+ that's based on
the interface you created in PR 14578. It calls WinAPI SetThreadDescription(),
which sets the thread's name directly in the kernel thread object (i.e.
ETHREAD.Th
Eryk Sun added the comment:
> It's nice if os.rename() can be atomic.
How about fixing the behavior in shutil.move()? Currently it tries
os.rename(src, dst) without checking for this case. For example:
>>> os.path.samefile('src', 'dst')
Eryk Sun added the comment:
> The Windows cmd implementation clearly uses readline or
> some compatible lib under the hood
The REPL shell and input() call PyOS_Readline(). If this call isn't hooked
(e.g. by the readline module), and stdin is a console file, then it reads a
li
New submission from Eryk Sun :
The file association for the store app uses '"%1"' for the command-line
parameters. This ignores the rest of the command-line arguments, i.e. '%*'. In
PC/layout/support/appxmanifest.py, the add_application() calls that
Eryk Sun added the comment:
> and b / a gives me WindowsPath('/a/b'). So I'm like "ok, a seems
> like absolute, I will test for that" but on Windows a.is_absolute()
> is False.
Path.is_absolute() is true if a path has a `root` and, for a Windows path, also
Eryk Sun added the comment:
> You can take the view that it's not a bug (with some justification),
> but a few lines in the cmd docs would make all the difference in
> terms of wasted time.
If anything, I think the readline documentation should have a note explaining
th
Eryk Sun added the comment:
> AFAIK the reason command history works in cmd.py on Windows is
> that it's built into the terminal program. Or maybe into the
> operating system.
As mentioned in msg406800, input editing, history (e.g. up/down arrows, F7
popup, F8 completion), and
Eryk Sun added the comment:
> What does "the builtin readline support" refer to here?
> Presumably not GNU Readline?
That's referring to the readline(ish) support that's built into the console
host for ReadFile() and ReadConsole() calls when the input stream is
Eryk Sun added the comment:
> AttributeError: Can't get attribute 'f'
> on
The Windows API only supports the spawn method of process creation. In POSIX
(except macOS), the default is the fork method, for which the child inherits
the interactive main module of the par
Eryk Sun added the comment:
In Windows, GetFileType((HANDLE)_get_osfhandle(fd)) is several times faster
than close(dup(fd)). For example:
#if defined(MS_WINDOWS)
int type;
_Py_BEGIN_SUPPRESS_IPH
type = GetFileType((HANDLE)_get_osfhandle(fd));
_Py_END_SUPPRESS_IPH
return
New submission from Eryk Sun :
During startup, is_valid_fd() in Python/pylifecycle.c is called to validate
stdin, stdout, and stderr. Performance isn't critical here, but every bit helps
in reducing startup time. In my tests, implementing this check in Windows via
GetFileType((H
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Eryk Sun added the comment:
I've created bpo-45919 with a suggested enhancement to use GetFileType() in
Windows, since the Windows C runtime does not provide fcntl().
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Eryk Sun added the comment:
test.py is a UTF-8 file, which is the default source encoding in Python 3. It
fails as expected if the test script is encoded differently, such as Latin-1,
unless the source encoding is declared.
--
nosy: +eryksun
resolution: -> out of date
st
Eryk Sun added the comment:
mmap no longer allows resizing if the object has buffer exports. For example:
>>> m = mmap.mmap(-1, 4096, access=mmap.ACCESS_WRITE)
>>> p = (ctypes.c_char * 4096).from_buffer(m)
>>> m.resize(8192)
Traceback (most re
Eryk Sun added the comment:
> make it returning False without invoking a system call if the file
> size is non-zero it will eliminate the need to expose _size.
I suggest using the file type instead of the size. There's no reason to call
isatty() if it's not an S_IFCHR file.
Eryk Sun added the comment:
This was fixed in 3.5.
--
nosy: +eryksun
resolution: -> duplicate
stage: -> resolved
status: open -> closed
superseder: -> Fix shutil.get_terminal_size() to catch AttributeError
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Eryk Sun added the comment:
> not quite clear to me it this only applies on Windows or is general.
macOS defaults to the spawn method (bpo-33725).
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Eryk Sun added the comment:
> it might be nice if it's possible to give some sort of useful
> warning/error when this happens -- perhaps say that specifying
> both shell=True and executable="..." isn't supported on Windows?
The `shell` parameter is documented as
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Eryk Sun added the comment:
Windows opens the working directory without delete sharing, so trying to delete
it fails with a PermissionError for ERROR_SHARING_VIOLATION (winerror 32).
I discussed a modified version of the _rmtree() method in msg377358. The
proposed version would try to reset
Eryk Sun added the comment:
The shebang "#!/usr/bin/env python" searches PATH for
"python" plus the PATHEXT file extensions.
The shebang "#!/usr/bin/env python3" uses the highest version of Python 3 from
the registry. It doesn't search PATH because Pytho
Eryk Sun added the comment:
This appears to be misreported. The implementation in 3.1.2rc1 looks correct to
me [1]. Either way, it's out of date.
That said, the emulation of a simple type in an aggregate type is still
incomplete nowadays. It's not implemented when a c_char or c_w
Eryk Sun added the comment:
The os module tries to avoid documenting low-level OS behaviors. It would be
unreliable and difficult to maintain.
In the case of os.replace(), in Windows it calls MoveFileExW() with the flag
MOVEFILE_REPLACE_EXISTING [1]. The source and destination paths must
Eryk Sun added the comment:
Whether it should be this way or not, here's how it currently works.
The builtin virtual paths all end with "python":
static SHEBANG builtin_virtual_paths [] = {
{ L"/usr/bin/env python", TRUE },
{ L"/usr/bin/pyth
Change by Eryk Sun :
--
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stage: patch review -> resolved
status: open -> closed
type: -> behavior
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Eryk Sun added the comment:
PyOS_Readline() calls PyOS_StdioReadline() if sys_stdin or sys_stdout isn't a
tty file. This function always writes the prompt to stderr, as follows:
if (prompt) {
fprintf(stderr, "%s", prompt);
}
fflush(stderr);
Maybe t
Eryk Sun added the comment:
You can use "#!python", or "#!/usr/bin/python", or "#!/usr/local/bin/python".
They're all equivalent, and they do not search PATH. Since no wanted version is
specified, the launcher will look for a version to run in the
Eryk Sun added the comment:
Ingrid's patch misses the requirement to log off after adding a privilege to
the current account. A new access token is required, from a fresh logon.
Privileges can also be added to groups, not just to individual user accounts.
Thus the symlink privilege c
Eryk Sun added the comment:
There's no parsing problem with delayed expansion (e.g. "!VAR!" instead of
%VAR%) and for loop variables (e.g. "%%a"). The solution is thus to execute in
a local scope that enables delayed expansion and command extensions [1].
Tha
Change by Eryk Sun :
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Eryk Sun added the comment:
Victor's comment wasn't relevant. objid() stays referenced during the call.
Anyway, I just built testlib.c and verified that this ctypes example works
correctly in both 64-bit 3.4.4 and 3.10, so the issue is out of date.
--
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Eryk Sun added the comment:
The _ctypes extension module could have a dict that maps each format code to
its (size, alignment), based on `formattable`. Then direct size comparisons
wouldn't be limited to types defined by the struct module, and it wouldn't be
necessary to create c_
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