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posix: re-allow preset aliases on interactive (re: ddaa145b)

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The POSIX standard in fact contains a sentence that specifically
allows preset aliases: "Implementations also may provide predefined
valid aliases that are in effect when the shell is invoked."
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_03_01

I had missed that back then. It's still a terrible idea for scripts
(particularly the way 93u+ implemented them), but for interactive
POSIX shells it makes a lot more sense and does not violate POSIX.

src/cmd/ksh93/sh/main.c: sh_main():
- Preset aliases for interactive shell regardless of SH_POSIX.
This commit is contained in:
Martijn Dekker 2022-06-09 21:50:26 +01:00
parent b14e79e9d0
commit 4f9456d69f
3 changed files with 9 additions and 14 deletions
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3
NEWS
View file

@ -11,6 +11,9 @@ Any uppercase BUG_* names are modernish shell bug IDs.
<##pattern redirection operators will not work and the -n option to the
read built-in will not return early when reading from a slow device.)
- An interactive shell initialized in POSIX mode now once again has the
preset aliases defined. This amends a change made on 2020-09-11.
2022-06-08:
- If -B/--braceexpand is turned on in --posix mode, it now only allows brace

11
src/cmd/ksh93/sh.1
View file

@ -811,11 +811,7 @@ definition command has to be executed before
the command which references the alias is read.
.PP
The following aliases are automatically preset
when the shell is invoked as an interactive shell,
unless invoked in POSIX compliance mode
(see
.I Invocation\^
below).
when the shell is invoked as an interactive shell.
Preset aliases can be unset or redefined.
.RS 20
.PD 0
@ -7700,9 +7696,8 @@ is automatically turned on upon invocation if the shell is invoked as \fBsh\fR
or \fBrsh\fR, or if \fB\-o posix\fR or \fB\-\-posix\fR is specified on the
shell invocation command line, or when executing scripts without a \fB#!\fR path
with this option active in the invoking shell. In that case, the invoked shell
will not set the preset aliases even if interactive, and will not import type
attributes for variables (such as integer or left/right justify)
from the environment.
will not import type attributes for variables (such as integer or left/right
justify) from the environment.
.RS 8
.PP
In addition, while on, the \fBposix\fR option

9
src/cmd/ksh93/sh/main.c
View file

@ -166,12 +166,9 @@ int sh_main(int ac, char *av[], Shinit_f userinit)
{
sh_onoption(SH_BGNICE);
sh_onoption(SH_RC);
if(!sh_isoption(SH_POSIX))
{
/* preset aliases for interactive non-POSIX ksh */
dtclose(sh.alias_tree);
sh.alias_tree = sh_inittree(shtab_aliases);
}
/* preset aliases for interactive ksh/sh */
dtclose(sh.alias_tree);
sh.alias_tree = sh_inittree(shtab_aliases);
}
#if SHOPT_REMOTE
/*