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Make ~ expand to home directory after unsetting HOME

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There was an issue with tilde expansion if the HOME var is unset.

	$ unset HOME
	$ echo ~
	martijn

Only the username is returned. Users are more likely to expect the
current user's home directory as configured in the OS.

POSIXly, the expansion of ~ is based on the value of HOME. If HOME
is unset, the results are unspecified. After unsetting HOME, in
bash, ~ returns the user's home directory as specified by the OS,
whereas in all other shells, ~ expands to the empty string. Only
ksh93 returns the username. The behaviour of bash is more useful.

Discussion:
https://github.com/ksh93/ksh/pull/225#issuecomment-799074107

src/cmd/ksh93/sh/macro.c,
src/cmd/ksh93/tests/tilde.sh:
- sh_tilde(): Backport fix by Mike Gilbert from ksh2020.
  See:	https://github.com/att/ast/issues/1391
	https://github.com/att/ast/pull/1396
	070d365d
- Add test.

src/cmd/ksh93/COMPATIBILITY:
- Note this change.
This commit is contained in:
Martijn Dekker 2021-03-15 21:49:02 +00:00
parent ef4fe4106c
commit 1df6a82a8a
5 changed files with 26 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

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 "2021-03-13" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_DATE "2021-03-15" /* must be in this format for $((.sh.version)) */
#define SH_RELEASE_CPYR "(c) 2020-2021 Contributors to ksh " SH_RELEASE_FORK
/* Scripts sometimes field-split ${.sh.version}, so don't change amount of whitespace. */