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
