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PR/53550 CVS commit: src/bin/sh

The following reply was made to PR bin/53550; it has been noted by GNATS.

From: "Robert Elz" <>
Subject: PR/53550 CVS commit: src/bin/sh
Date: Mon, 22 Nov 2021 05:17:43 +0000

 Module Name:	src
 Committed By:	kre
 Date:		Mon Nov 22 05:17:43 UTC 2021
 Modified Files:
 	src/bin/sh: eval.c expand.c expand.h nodetypes redir.c
 Log Message:
 PR bin/53550
 Here we go again...   One more time to redo how here docs are
 processed (it has been a few years since the last time!)
 This is actually a relatively minor change, mostly to timimg
 (to just when things happen).   Now here docs are expanded at the
 same time the "filename" word in a redirect is expanded, rather than
 later when the heredoc was being sent to its process.  This actually
 makes things more consistent - but does break one of the ATF tests
 which was testing that we were (effectively) internally inconsistent
 in this area.
 Not all shells agree on the context in which redirection expansions
 should happen, some make any side effects visible to the parent shell
 (the majority do) others do the redirection expansions in a subshell
 so any side effcts are lost.   We used to have a foot in each camp,
 with the majority for everything but here docs, and the minority for
 here docs.   Now we're all the way with LBJ ... (or something like that).
 To generate a diff of this commit:
 cvs rdiff -u -r1.185 -r1.186 src/bin/sh/eval.c
 cvs rdiff -u -r1.140 -r1.141 src/bin/sh/expand.c
 cvs rdiff -u -r1.25 -r1.26 src/bin/sh/expand.h
 cvs rdiff -u -r1.19 -r1.20 src/bin/sh/nodetypes
 cvs rdiff -u -r1.71 -r1.72 src/bin/sh/redir.c
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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