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Message-ID: | <fa1a4430-5da1-4f2b-8b6e-873a8c036d40@Shaw.ca> |
Date: | Fri, 17 Nov 2023 07:56:53 -0700 |
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Subject: | Re: Cygwin tool to differ junctions from soft links? |
To: | cygwin AT cygwin DOT com |
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Organization: | Inglis |
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From: | Brian Inglis via Cygwin <cygwin AT cygwin DOT com> |
Reply-To: | cygwin AT cygwin DOT com |
Cc: | Brian Inglis <Brian DOT Inglis AT Shaw DOT ca> |
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On 2023-11-16 22:54, Thomas Wolff via Cygwin wrote: > Am 16.11.2023 um 21:30 schrieb Brian Inglis via Cygwin: >> On 2023-11-16 11:55, matthew patton via Cygwin wrote: >>> On Thursday, November 16, 2023 at 03:50:24 AM EST, Andrey Repin wrote: >>>>> Does Cygwin have a command line tool (Scriptable!) which can be used to >>>>> differ between soft links and Windows junctions? >> Distinguishing between types of Windows reparse points is not a POSIX or >> emulation function, so not of interest to Cygwin developers. >> I thought about it when support was added, but then realized there was no nice >> place to add it within the platform, without going the non-portable Windows >> specific utility route, as in lsattr. >> You could in a function or script by running lsattr -d which seems to fail on >> reparse points, then ls -dl which shows a Symbolic Link with a relative path, >> and a Junction with an absolute path, although it could just be a Symbolic >> Link with an absolute path. > lsattr has an explicit flag: >             'r', 'Reparse':      file or directory that has a reparse point > I don't know whether it's the same as a junction, otherwise a 'j' flag could be > added. Notice that the flag is the same as 'r' "Readonly" and lsattr does not work on Windows Reparse Points which are Junctions, Directory or File Symbolic Links [sanitized]: $ cd ~ $ cmd /c dir /a:l | grep '>' 2021-04-13 10:41 <JUNCTION> Application Data [$HOME/AppData/Roaming] 2021-06-21 21:07 <JUNCTION> Bookshelf [...] 2021-04-13 10:41 <JUNCTION> Cookies [$HOME/AppData/Local/Microsoft/Windows/INetCookies] 2021-09-15 10:23 <JUNCTION> cygwin-64t [...] 2021-04-13 10:41 <JUNCTION> Local Settings [$HOME/AppData/Local] 2020-04-21 03:33 <SYMLINKD> Mail [AppData/Roaming/...] 2021-04-13 10:41 <JUNCTION> My Documents [$HOME/Documents] 2021-04-13 10:41 <JUNCTION> NetHood [$HOME/AppData/Roaming/Microsoft/Windows/Network Shortcuts] 2023-05-27 07:30 <JUNCTION> ntp-dev [...] 2023-05-27 07:30 <JUNCTION> ntp-stable [...] 2021-04-13 10:41 <JUNCTION> PrintHood [$HOME/AppData/Roaming/Microsoft/Windows/Printer Shortcuts] 2021-04-13 10:41 <JUNCTION> Recent [$HOME/AppData/Roaming/Microsoft/Windows/Recent] 2021-04-13 10:41 <JUNCTION> SendTo [$HOME/AppData/Roaming/Microsoft/Windows/SendTo] 2021-04-13 10:41 <JUNCTION> Start Menu [$HOME/AppData/Roaming/Microsoft/Windows/Start Menu] 2021-02-10 21:19 <JUNCTION> Tech [...] 2021-04-13 10:41 <JUNCTION> Templates [$HOME/AppData/Roaming/Microsoft/Windows/Templates] 2022-05-27 19:15 <JUNCTION> weather [...] 2020-06-20 01:19 <SYMLINK> _gvimrc [.vim/gvimrc] 2020-06-20 01:06 <SYMLINKD> _vim [.vim] 2020-06-20 00:51 <SYMLINK> _viminfo [.vim/viminfo] 2020-06-20 00:51 <SYMLINK> _vimrc [.vim/vimrc] $ cmd /c dir /a:l /b "$HOMEPATH" | d2u | xargs -I@ lsattr -d '@' lsattr: Not supported on Application Data lsattr: Not supported on Bookshelf lsattr: Not supported on Cookies lsattr: Not supported on cygwin-64t lsattr: Not supported on Local Settings lsattr: Not supported on Mail lsattr: Not supported on My Documents lsattr: Not supported on NetHood lsattr: Not supported on ntp-dev lsattr: Not supported on ntp-stable lsattr: Not supported on PrintHood lsattr: Not supported on Recent lsattr: Not supported on SendTo lsattr: Not supported on Start Menu lsattr: Not supported on Tech lsattr: Not supported on Templates lsattr: Not supported on weather lsattr: Not supported on _gvimrc lsattr: Not supported on _vim lsattr: Not supported on _viminfo lsattr: Not supported on _vimrc >> Perhaps something like the following would be useful to Windows users who want >> to know this stuff: >>     https://schinagl.priv.at/nt/hardlinkshellext/hardlinkshellext.html >>>> It would be easier to help you, if you specify the purpose of your >>>> request. I.e. what you want to achieve with such tool. >>> AFAIK no. what I do is re-implement 'ln' with a wrapper because the Cygwin >>> behavior (Junctions) was driving me up the wall. >>> https://github.com/tb3088/shell-environment/blob/ccf7aa161899c2c4ebe2d9e980e674bc726a3ef3/.functions_os.CYGWIN_NT#L9 >> Cygwin never creates Windows Directory or Filesystem Junction reparse points, >> and by default it uses its own version of Unix path symlink files, preceded by >> a flag ("magic cookie") value, and with system attribute, to allow >> compatibility with FAT file system limitations, or else NFS symlinks on NFS >> filesystems. >> CYGWIN env var settings allow creation of Windows shortcuts and symbolic link >> reparse points instead of its default (equivalent to winsymlinks:sys), when >> supported by the file system and Windows release: >>     https://cygwin.com/cygwin-ug-net/using-cygwinenv.html >>     https://cygwin.com/cygwin-ug-net/using.html#pathnames-symlinks -- Take care. Thanks, Brian Inglis Calgary, Alberta, Canada La perfection est atteinte Perfection is achieved non pas lorsqu'il n'y a plus rien à ajouter not when there is no more to add mais lorsqu'il n'y a plus rien à retirer but when there is no more to cut -- Antoine de Saint-Exupéry -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
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