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lineedit: get PWD from ash

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The line editing code and ash disagree when the current directory
is changed to a symbolic link:

   ~ $ mkdir real
   ~ $ ln -s real link
   ~ $ cd link
   ~/real $ pwd
   /home/rmyf36/link

Note the prompt says we're in ~/real.  Bash does:

   [rmy@random ~]$ cd link
   [rmy@random link]$ pwd
   /home/rmyf36/link

Ash uses the name supplied by the user while the line editing code
calls getcwd(3).  The discrepancy can be avoided by fetching the
value of PWD from ash.

Hush calls getcwd(3) when the directory is changed
so there's no disagreement with the line editing code.

There is no standard how shells should handle cd'ing into
symlinks.

function                                             old     new   delta
parse_and_put_prompt                                 838     869     +31

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Ron Yorston 2022-06-28 13:40:49 +01:00 committed by Denys Vlasenko
parent 20a4f70eca
commit 298ac9507b
1 changed files with 6 additions and 0 deletions
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6
libbb/lineedit.c
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@ -2035,7 +2035,13 @@ static void parse_and_put_prompt(const char *prmt_ptr)
case 'W': /* basename of cur dir */
if (!cwd_buf) {
const char *home;
#if ENABLE_SHELL_ASH
cwd_buf = state->sh_get_var
? xstrdup(state->sh_get_var("PWD"))
: xrealloc_getcwd_or_warn(NULL);
#else
cwd_buf = xrealloc_getcwd_or_warn(NULL);
#endif
if (!cwd_buf)
cwd_buf = (char *)bb_msg_unknown;
else if ((home = get_homedir_or_NULL()) != NULL && home[0]) {