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config.sub: work around command assignment bug in some shells

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When combining variable assignments with a shell command, some older
shells (notably heirloom-sh and presumably also Solaris 10 /bin/sh)
have a bug which causes the assignment to alter the current execution
environment whenever the command is a shell built-in.  For example:

  % dash -c 'x=good; x=bad echo >/dev/null; echo $x'
  good

  % jsh -c 'x=good; x=bad echo >/dev/null; echo $x'
  bad

The config.sub script contains a few commands of the form:

  IFS=- read ...

which triggers this bug, causing the IFS assignment to persist for the
remainder of the script.  This can cause misbehaviour in certain cases,
for example:

  % jsh config.sub i386-linux-gnu
  config.sub: test: unknown operator gnu

  % jsh config.sub i386-gnu/linux
  sed: can't read s|gnu/linux|gnu|: No such file or directory
  Invalid configuration `i386-gnu/linux': OS `' not recognized

* config.sub: Save and restore IFS explicitly to avoid shell bugs.
* doc/config.sub.1: Regenerate.

Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
This commit is contained in:
Nick Bowler
2021-08-14 12:20:38 -04:00
committed by Dmitry V. Levin
parent 2707e389a5
commit 191bcb948f
2 changed files with 8 additions and 2 deletions
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2
doc/config.sub.1
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@ -1,5 +1,5 @@
.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.47.16.
.TH CONFIG.SUB "1" "August 2021" "GNU config.sub (2021-08-04)" "User Commands"
.TH CONFIG.SUB "1" "August 2021" "GNU config.sub (2021-08-14)" "User Commands"
.SH NAME
config.sub \- validate and canonicalize a configuration triplet
.SH SYNOPSIS