Re: Cannot edit existing password using vim (or gvim)

[Kevin Cox]

On 02/12/16 11:13, ads wrote:

Thanks for the suggestion.

I looked at strace, but couldn't see any obvious cause (no EPERM for 
example).  I set up a new user where it all worked properly, so I 
started to try and find a difference, and realised that my normal 
userid uses gvim (echo $EDITOR --> gvim) while my new test user uses 
vim. So to make the straces comparable I switched to using vim for 
this task, but using vim I find works fine anyway. I don't really need 
to find out why gvim doesn't work since I have a good work-around, 
i.e. preface the pass edit command with EDITOR=vim.
I think that gvim detaches by default, so when it "exits" pass saves the 
(unchanged) file. Then you edit the file but pass is long gone.


There might be a flag you can set to make it "block" or stay in the 
foreground. That or use a different editor.

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Re: Cannot edit existing password using vim (or gvim)

[ads]

Thanks for the suggestion.

I looked at strace, but couldn't see any obvious cause (no EPERM for
example).  I set up a new user where it all worked properly, so I started
to try and find a difference, and realised that my normal userid uses gvim
(echo $EDITOR --> gvim) while my new test user uses vim. So to make the
straces comparable I switched to using vim for this task, but using vim I
find works fine anyway. I don't really need to find out why gvim doesn't
work since I have a good work-around, i.e. preface the pass edit command
with EDITOR=vim.
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Re: Cannot edit existing password using vim (or gvim)

[Brian Candler]

On 01/12/2016 12:20, ads wrote:
If I do mkdir /dev/shm/foo, then touch /dev/shm/foo/bar, the file bar 
gets written correctly.



And what if you do "gvim /dev/shm/foo/bar" ?

Is it possible that there is an apparmor policy for gvim, which is 
preventing it opening files under /dev ?
Somebody else suggested setting nobackup in vim, and I have tried that 
(and nowritebackup too). No difference. I have also removed my .vimrc 
file and .vim directory, and no difference.


I'm very puzzled.


It might be useful to do an strace to see the actual system call it 
tried to do and the error it got back:


strace -f pass edit  2>strace.out

This will generate a ton of splurge in file strace.out, but if you 
search through it for EPERM somewhere near the end, or just before it 
prints the error message, it may give a clue.


Regards,

Brian.

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Re: Cannot edit existing password using vim (or gvim)

[Florian Margaine]

Hi,

On Dec 1, 2016 10:53 AM, "ads"  wrote:
>
> I apologise for re-opening this topic. I did not receive the reply kindly
sent me by Renato Alves other than as part of a daily digest (I had only
subscribed to digests) and I don't know how to simulate a reply to keep the
old thread going.
>
> My original query was as follows:
>
>> When I try to edit an existing password using vim, when it comes time to
>> save (I enter :w as a vim command) I get a message
>> "/dev/shm/pass.tQVSIzXmX17hI/McsB5-test-pass.txt" E212: Cannot open file
>> for writing
>>
>> I'm sure I used to be able to edit passwords, but I can't work out why I
>> can't save to /dev/shm. Does anybody have any ideas?
>>
>> Steps to recreate:
>>
>> 1) pass add test-pass (followed by entering the password twice)
>> 2) pass show test-pass works fine and displays password from previous
>> step
>> 3) pass edit test-pass
>>
>> opens instance of gvim, so I make a change and :w and I get the error
>> message above.
>>
>>
>> Notes:
>>
>>
>>1. mount | grep "shm" gives
>>tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
>>2. df -h | grep shm gives
>>tmpfs  3.8G  152M  3.7G   4% /dev/shm i.e. we're not
out
>>of temp disk space (or indeed inodes, checked separately)
>>3. crontab -e works, so saving to a temporary file seems to work
>>4. with EDITOR set to nano, it seems to work
>
>
> Renato Alves replied:
>
>> Most likely permissions. Try: ls -ld /dev/shm
>>
> When I try ls -ld /dev/shm I get
>>
>>
>> drwxrwxrwt 2 root root 260 Dec  1 09:19 /dev/shm
>>
>> which looks good to me.
>>
> If I try touch /dev/shm/something then I get no message and something is
created in the /dev/shm directory.
>
> If I try vim /dev/shm/something-else, add a line, then :wq, it all works
fine (the something-else file is created).
>
> As I said above, if I do pass edit test-pass, then when I do :w I get
e.g. message
>
> "/dev/shm/pass.tQVSIzXmX17hI/McsB5-test-pass.txt" E212: Cannot open file
> for writing
>
> but if instead of :w I do :saveas /dev/shm/anything then it saves fine,
but of course the original password file is not changed.

What if you try to write in /dev/shm/foo/bar?

>
> It seems to be only when I try to write to the temporary filename that is
created as part of the process of executing pass edit etc. that I am
blocked from writing.
>
> Sorry to go on at such length. If anybody has a clue why this might be
happening, I would be grateful to know.
>
> Thanks.
>
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Cannot edit existing password using vim (or gvim)

[ads]

I apologise for re-opening this topic. I did not receive the reply kindly
sent me by Renato Alves other than as part of a daily digest (I had only
subscribed to digests) and I don't know how to simulate a reply to keep the
old thread going.

My original query was as follows:

When I try to edit an existing password using vim, when it comes time to
save (I enter :w as a vim command) I get a message
"/dev/shm/pass.tQVSIzXmX17hI/McsB5-test-pass.txt" E212: Cannot open file
for writing

I'm sure I used to be able to edit passwords, but I can't work out why I
can't save to /dev/shm. Does anybody have any ideas?

Steps to recreate:

1) pass add test-pass (followed by entering the password twice)
2) pass show test-pass works fine and displays password from previous
step
3) pass edit test-pass

opens instance of gvim, so I make a change and :w and I get the error
message above.


Notes:


   1. mount | grep "shm" gives
   tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
   2. df -h | grep shm gives
   tmpfs  3.8G  152M  3.7G   4% /dev/shm i.e. we're not out
   of temp disk space (or indeed inodes, checked separately)
   3. crontab -e works, so saving to a temporary file seems to work
   4. with EDITOR set to nano, it seems to work


Renato Alves replied:

Most likely permissions. Try: ls -ld /dev/shm

When I try ls -ld /dev/shm I get


drwxrwxrwt 2 root root 260 Dec  1 09:19 /dev/shm

which looks good to me.

If I try touch /dev/shm/something then I get no message and something is
created in the /dev/shm directory.

If I try vim /dev/shm/something-else, add a line, then :wq, it all works
fine (the something-else file is created).

As I said above, if I do pass edit test-pass, then when I do :w I get e.g.
message

"/dev/shm/pass.tQVSIzXmX17hI/McsB5-test-pass.txt" E212: Cannot open file
for writing

but if instead of :w I do :saveas /dev/shm/anything then it saves fine, but
of course the original password file is not changed.

It seems to be only when I try to write to the temporary filename that is
created as part of the process of executing pass edit etc. that I am
blocked from writing.

Sorry to go on at such length. If anybody has a clue why this might be
happening, I would be grateful to know.

Thanks.
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Cannot edit existing password using vim (or gvim)

[Jonathan Clark]

When I try to edit an existing password using vim, when it comes time to
save (I enter :w as a vim command) I get a message
"/dev/shm/pass.tQVSIzXmX17hI/McsB5-test-pass.txt" E212: Cannot open file
for writing


"/dev/shm/pass.BrDRETCxY0V0s/DlvET-visa...3603.txt" E212: Cannot open file
for writing".

I'm sure I used to be able to edit passwords, but I can't work out why I
can't save to /dev/shm. Does anybody have any ideas?

Steps to recreate:

1) pass add test-pass (followed by entering the password twice)
2) pass show test-pass N.B. works fine and displays password from previous
step
3) pass edit test-pass

opens instance of gvim, so I make a change and :w and I get the error
message above.


Notes:


   1. mount | grep "shm" gives
   tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
   2. df -h | grep shm gives
   tmpfs  3.8G  152M  3.7G   4% /dev/shm i.e. we're not out
   of temp disk space
   3. crontab -e works, so saving to a temporary file seems to work
   4. with EDITOR set to nano, it seems to work

Thanks,
A
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