Re: Wrong expansion of ~/

[Thomas Wolff <towo@towo.net>]

Am 27.08.2020 um 18:49 schrieb rifter via Cygwin:
> On 8/27/20, Morten Kjærulff via Cygwin <cygwin@cygwin.com> wrote:
>> On Tue, Aug 25, 2020 at 3:00 PM Brian Inglis wrote:
>>> On 2020-08-25 01:15, Morten Kjærulff via Cygwin wrote:
>>>> On Mon, Aug 24, 2020 at 10:41 PM Brian Inglis wrote:
>>>>> On 2020-08-24 06:36, Morten Kjærulff via Cygwin wrote:
>>>>>> On Mon, Aug 24, 2020 at 11:52 AM Thomas Wolff wrote:
>>>>>>> Am 24.08.2020 um 10:05 schrieb Morten Kjærulff via Cygwin:
>>>>>>>> I have a script that starts several tmux panes with my favorite
>>>>>>>> commands.
>>>>>>>> In some (*some* and only *sometimes*) of the panes I see:
>>>>>>>>
>>>>>>>> -bash: /home/xxxxxP/.git-completion.bash: No such file or directory
>>>>>>>> -bash: /home/xxxxxP/.git-prompt.sh: No such file or directory
>>>>>>>>
>>>>>>>> My .bashrc has:
>>>>>>>>
>>>>>>>> $ grep git .bashrc
>>>>>>>> . ~/.git-completion.bash
>>>>>>>> . ~/.git-prompt.sh
>>>>>>>>
>>>>>>>> My userid is xxxxxf (and not xxxxxP).
>>>>>>>>
>>>>>>>> Is this known?
>>>>>>> What if you trace `echo $HOME; echo ~` after the `.`? I have
>>>>>>> occasional
>>>>>>> cases where $HOME and ~ start to be different in my shell, which is
>>>>>>> quite weird and should not happen according to bash documentation.
>>>>>> Ok,
>>>>>>
>>>>>> My userid is xx00mkf.
>>>>>>
>>>>>>
>>>>>> If I add:
>>>>>>
>>>>>> . ~/.git-completion.bash
>>>>>> if [ ! $? = 0 ] ; then
>>>>>>    echo "HOME=" $HOME
>>>>>>    echo "~=" ~
>>>>>> fi
>>>>>>
>>>>>> I see:
>>>>>>
>>>>>> -bash: /home/xx00m/.git-completion.bash: No such file or directory
>>>>>> HOME= /home/xx00mkf
>>>>>> ~= /home/xx00m
>>>>>>
>>>>>>
>>>>>> If I add:
>>>>>>
>>>>>> . ~/.git-completion.bash
>>>>>> if [ ! $? = 0 ] ; then
>>>>>>    echo "HOME=" $HOME
>>>>>>    echo "~=" ~
>>>>>>    echo "~/.git-completion.bash=" ~/.git-completion.bash
>>>>>> fi
>>>>>>
>>>>>> -bash: /home/xx00m/.git-completion.bash: No such file or directory
>>>>>> HOME= /home/xx00mkf
>>>>>> ~= /home/xx00mkf
>>>>>> ~/.git-completion.bash= /home/xx00mkf/.git-completion.bash
>>>>> HOME dir depends on entries in:
>>>>>
>>>>>          /etc/nsswitch.conf
>>>>>
>>>>> whether you have /etc/passwd and/or /etc/group files and their entries;
>>>>>
>>>>> your SAM and/or AD entry contents including e.g.
>>>>>
>>>>>          $ net user $USER | grep '^Comment'
>>>>>          Comment         <cygwin home="/home/..." group="Users"...>
>>>>>
>>>>> You can check if any of these are in effect by running:
>>>>>
>>>>>          $ getent passwd $USER
>>>>>
>>>>> If you think they are relevant, you might also want to try to trace and
>>>>> debug
>>>>> your bash-completion setup scripts:
>>>>>
>>>>>          $ set -vx
>>>>>          $ . /etc/profile.d/bash_completion.sh |& tee
>>>>> /tmp/completion.log | less
>>>>>
>>>>> to see what they are doing that might affect other settings.
>>>> Thanks, but ~ changes from xx01m to xx01mkf (which is correct) between
>>>> a few commands in .bashrc:
>>>>
>>>> If I add:
>>>>
>>>> . ~/.git-completion.bash
>>>> if [ ! $? = 0 ] ; then
>>>>    echo "HOME=" $HOME
>>>>    echo "~=" ~
>>>>    echo "~/.git-completion.bash=" ~/.git-completion.bash
>>>> fi
>>>>
>>>> I see (*sometimes*):
>>>>
>>>> -bash: /home/xx00m/.git-completion.bash: No such file or directory
>>>> <<<wrong
>>>> HOME= /home/xx00mkf
>>>> ~= /home/xx00mkf <<<correct
>>>> ~/.git-completion.bash= /home/xx00mkf/.git-completion.bash <<<correct
>>> Well then you have to trace and debug those commands run from your .bashrc
>>> where
>>> ~ changes, perhaps using bashdb?
>> I really don't know how I can debug this?
>>
>> With this:
>>
>> . ~/.git-completion.bash
>>
>> ~ is *sometimes* expanded wrongly:
>>
>> With this:
>>
>> while [ ! ~ = $HOME ] ; do
>>    echo "$0: !!! ~ =! \$HOME" >&2
>> done
>> . ~/.git-completion.bash
>>
>> I *sometimes* see an endless loop.
>>
>> With this:
>>
>> while [ ! ~ = $HOME ] ; do
>>    echo "$0: !!! ~ =! \$HOME" ~ $HOME >&2
>> done
>> . ~/.git-completion.bash
>>
>> I see no error.
>>
>> I have a script that I run under mintty. The script starts tmux, with
>> some panes. I see the error *sometimes* in *some* panes (not the same
>> every time).
>>
>> /Morten
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>>
> I've had funky results from time  to time on  ~ expansion in cygwin
> bash. usually it works fine. But sometimes one of the terminal windows
> gets into a state where ~ becomes something that isn't all that
> intelligible and breaks scripts. I forget if starting a new terminal
> fixes it - usually I just quit using ~ until I end up rebooting. Never
> really tracked it down.
It's sufficient to start a new bash (exec bash) to recover. I have the 
effect that sometimes (rarely) ~ flips to become /home/$USER on one 
system where $HOME is configured to be somewhere else.
I once tried to track it down in bash source, without success so far. 
Yet I suspect it's a bash bug.
Thomas