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Re: PWD not made canonical on shell start


From: Eduardo Bustamante
Subject: Re: PWD not made canonical on shell start
Date: Tue, 23 May 2017 09:28:15 -0500

On Tue, May 23, 2017 at 8:51 AM,  <address@hidden> wrote:
[...]
> Bash Version: 4.3
> Patch Level: 48
> Release Status: release

I can reproduce with 4.4.11(1)-release and the latest devel branch

[...]
>         As implemented, I now have to start every shell script that
>         uses $PWD before using "cd" with either 'cd "$(/bin/pwd)"' or
>         'set -o physical ; cd .' to get PWD into a usable state.

As an aside: any reason you use /bin/pwd instead of the shell builtin pwd?


The problem seems to be that `sh_canonpath' is called to set the
working directory (`set_working_directory'), but the value of PWD is
not updated with the canonical version.

Here's what I think is the fix. I'm not sure if the set_auto_export is
needed, most likely it isn't.

address@hidden:~/src/gnu/bash$ git diff -- variables.c
diff --git a/variables.c b/variables.c
index 944de86e..e0a258dd 100644
--- a/variables.c
+++ b/variables.c
@@ -852,6 +852,8 @@ set_pwd ()
        current_dir = get_working_directory ("shell_init");
       else
        set_working_directory (current_dir);
+      temp_var = bind_variable ("PWD", current_dir, 0);
+      set_auto_export (temp_var);
       free (current_dir);
     }
   else if (home_string && interactive_shell && login_shell &&



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