Fish shell fails with PermissionDenied on rename file, if Cygwin home directory is a Junction.
- Date: Fri, 7 Sep 2018 21:28:27 +0200
- From: Marcin Kielar <marcin.kielar@xxxxxxxxx>
- Subject: Fish shell fails with PermissionDenied on rename file, if Cygwin home directory is a Junction.
This report originates from a ticket created on Fish Github account here: https://github.com/fish-shell/fish-shell/issues/2590
The issue is, that for some reason, running fish shell fails with PermissionDenied error if the home directory is a Windows Junction.
This is what I get when I run fish in my setup:
<E> fish: Unable to rename file from '/home/marcin/.config/fish/fishd.tmp.QvV0Fd' to '/home/marcin/.config/fish/fishd.BENEK.x86_64': Permission denied
<E> fish: Unable to rename file from '/home/marcin/.config/fish/fishd.tmp.Os5Tmd' to '/home/marcin/.config/fish/fishd.BENEK.x86_64': Permission denied
<E> fish: Unable to rename file from '/home/marcin/.config/fish/fishd.tmp.3Bop6u' to '/home/marcin/.config/fish/fishd.BENEK.x86_64': Permission denied
I have my cygwin home directory created as a junction to a folder on another disk, which is managed by OneDrive. This is how this looks from cmd.exe side:
Volume in drive C is SYSTEM
Volume Serial Number is 1AD1-BCDF
Directory of c:\tools\cygwin\home
14.04.2018 00:53 <DIR> .
14.04.2018 00:53 <DIR> ..
11.11.2017 23:45 <JUNCTION> marcin [d:\OneDrive\tools\CYGWIN_HOME]
0 File(s) 0 bytes
3 Dir(s) 77 744 492 544 bytes free
The junction was create with `mklink` command as below:
mklink /J marcin d:\OneDrive\tools\CYGWIN_HOME
What you can see below is an excerpt from the `strace fish > log 2>&1` command.
The bigger trace is available here: http://s000.tinyupload.com/index.php?file_id=09852752977194690660 and contains the whole `strace` log up to the point when it just starts logging identical errors.
The interesting part seems to be this:
64 381028 [main] fish 2084 mount_info::conv_to_win32_path: conv_to_win32_path (/home/marcin/.config/fish)
64 381092 [main] fish 2084 mount_info::cygdrive_win32_path: src '/home/marcin/.config/fish', dst ''
73 381165 [main] fish 2084 set_flags: flags: binary (0x2)
119 381284 [main] fish 2084 mount_info::conv_to_win32_path: src_path /home/marcin/.config/fish, dst C:\tools\cygwin\home\marcin\.config\fish, flags 0x3000A, rc 0
248 381532 [main] fish 2084 symlink_info::check: 0x0 = NtCreateFile (\??\C:\tools\cygwin\home\marcin\.config\fish)
135 381667 [main] fish 2084 symlink_info::check: not a symlink
100 381767 [main] fish 2084 symlink_info::check: 0 = symlink.check(C:\tools\cygwin\home\marcin\.config\fish, 0xFFFF9150) (0x3000A)
55 381822 [main] fish 2084 path_conv::check: this->path(C:\tools\cygwin\home\marcin\.config\fish\BENEK), has_acls(1)
111 381933 [main] fish 2084 __set_errno: int rename2(const char*, const char*, unsigned int):2135 setting errno 2
147 382080 [main] fish 2084 rename2: -1 = rename(/home/marcin/.config/fish/BENEK, /home/marcin/.config/fish/fishd.BENEK.x86_64), errno 2
We have „not a symlink” response, followed by a failing rename call.
All other Cygwin tools work correctly. I can manually rename the files using `mv`. This does not seem to be ACL / access issue, or at least not for any other tools I use, and I use Cygwin in this setup for years. Earlier, the junction was to a Dropbox-managed folder, now it’s OneDrive-managed one. This however seems not to make any difference, and it seems that the Junction is the main issue.
Please also have a look at the Github Ticket, perhaps you’ll find more details in there.
I’ll be happy to provide more information/logs/etc if required.
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