New submission from Gregg Tavares <git...@greggman.com>:
MacOS have extended file attributes. Windows has both extended file attributes and alternate streams. In both OSes copy/cp and of course the Finder and Windows Explorer copy all this data. Python copy2 does not. On Windows it seems like CopyFileW needs to be called to actually do a full copy. https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-copyfilew On MacOS it appears to require copyItem https://developer.apple.com/documentation/foundation/filemanager/1412957-copyitem It's kind of unexpected to call a function to copy a file and have it not actually copy the file and have the user lose data Windows example > dir Directory: C:\Users\gregg\temp\test Mode LastWriteTime Length Name ---- ------------- ------ ---- -a---- 11/24/2019 8:58 PM 28 original.txt > Set-Content -Path original.txt -Stream FooBar cmdlet Set-Content at command pipeline position 1 Supply values for the following parameters: Value[0]: python should copy this too Value[1]: > Get-Content -Path original.txt -Stream FooBar python should copy this too > copy .\original.txt .\copied-with-copy.txt > Get-Content -Path copied-with-copy.txt -Stream FooBar python should copy this too > C:\Users\gregg\AppData\Local\Programs\Python\Python38\python.exe Python 3.8.0 (tags/v3.8.0:fa919fd, Oct 14 2019, 19:37:50) [MSC v.1916 64 bit (AMD64)] on win32 Type "help", "copyright", "credits" or "license" for more information. >>> import shutil >>> shutil.copy2("original.txt", "copied-with-python3.txt") >>> exit() > Get-Content -Path copied-with-python3.txt -Stream FooBar > Get-Content : Could not open the alternate data stream 'FooBar' of the file > 'C:\Users\gregg\temp\test\copied-with-python3.txt'. At line:1 char:1 + Get-Content -Path copied-with-python3.txt -Stream FooBar + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : ObjectNotFound: (C:\Users\gregg\...ith-python3.txt:String) [Get-Content], FileNotFoundException + FullyQualifiedErrorId : GetContentReaderFileNotFoundError,Microsoft.PowerShell.Commands.GetContentCommand MacOS example $ ls -l -@ total 1120 -rw-r--r--@ 1 gregg staff 571816 Nov 24 18:48 original.jpg com.apple.lastuseddate#PS 16 com.apple.macl 72 com.apple.metadata:kMDItemWhereFroms 530 com.apple.quarantine 57 $ cp original.jpg copied-with.cp $ ls -l -@ total 2240 -rw-r--r--@ 1 gregg staff 571816 Nov 24 18:48 copied-with.cp com.apple.lastuseddate#PS 16 com.apple.macl 72 com.apple.metadata:kMDItemWhereFroms 530 com.apple.quarantine 57 -rw-r--r--@ 1 gregg staff 571816 Nov 24 18:48 original.jpg com.apple.lastuseddate#PS 16 com.apple.macl 72 com.apple.metadata:kMDItemWhereFroms 530 com.apple.quarantine 57 $python3 Python 3.8.0 (default, Nov 24 2019, 18:48:01) [Clang 11.0.0 (clang-1100.0.33.8)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> import shutil >>> shutil.copy2('original.jpg', 'copied-with-python3.jpg') 'copied-with-python3.jpg' >>> exit() $ ls -l -@ total 3360 -rw-r--r--@ 1 gregg staff 571816 Nov 24 18:48 copied-with-python3.jpg com.apple.quarantine 57 -rw-r--r--@ 1 gregg staff 571816 Nov 24 18:48 copied-with.cp com.apple.lastuseddate#PS 16 com.apple.macl 72 com.apple.metadata:kMDItemWhereFroms 530 com.apple.quarantine 57 -rw-r--r--@ 1 gregg staff 571816 Nov 24 18:48 original.jpg com.apple.lastuseddate#PS 16 com.apple.macl 72 com.apple.metadata:kMDItemWhereFroms 530 com.apple.quarantine 57 ---------- components: Library (Lib), Windows, macOS messages: 357395 nosy: greggman, ned.deily, paul.moore, ronaldoussoren, steve.dower, tim.golden, zach.ware priority: normal severity: normal status: open title: copy2 doesn't copy metadata on Windows and MacOS type: behavior versions: Python 3.8 _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue38906> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
