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'cd': properly ignore $CDPATH if initial component is '.' or '..'

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@stephane-chazelas writes:
> Per POSIX[*], cd should skip the $CDPATH processing if the first
> component of the directory given to cd is . or ...
>
> Yet, with ksh93u+m 2021-01-03 at least, while that's OK with ..,
> it's not with . with or without the posix option:
>
> $ CDPATH=/ ./ksh -o posix -c 'cd -P ./etc && pwd'
> /etc
> /etc
>
> It seems to be a regression introduced with ksh93u+ as I can't
> reproduce it with ksh93u or any version prior to that. I can also
> reproduce in u+, v- and the ksh2020 from the Ubuntu 20.04
> package.

src/cmd/ksh93/bltins/cd_pwd.c: b_cd():
- Skip $CDPATH processing not only if the path is absolute, but
  also if the initial path component is '.' or '..' (in the latter
  case the $CDPATH processing was done but appeared to be a no-op).

src/cmd/ksh93/tests/builtins.sh:
- Add regression test.

[*] https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/cd.html

Fixes: https://github.com/ksh93/ksh/issues/151
This commit is contained in:
Martijn Dekker 2021-01-05 04:55:07 +00:00
parent 3567220898
commit d1483150ab
4 changed files with 18 additions and 4 deletions
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2
src/cmd/ksh93/include/version.h
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@ -20,7 +20,7 @@
#define SH_RELEASE_FORK "93u+m" /* only change if you develop a new ksh93 fork */
#define SH_RELEASE_SVER "1.0.0-alpha" /* semantic version number: https://semver.org */
#define SH_RELEASE_DATE "2021-01-03" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-01-05" /* must be in this format for $((.sh.version)) */
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */
/* Arithmetic $((.sh.version)) uses the last 10 chars, so the date must be at the end. */