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bug#47382: runtest doesn't work with Solaris 10 /bin/sh

From: Rainer Orth
Subject: bug#47382: runtest doesn't work with Solaris 10 /bin/sh
Date: Thu, 15 Apr 2021 16:23:31 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1.90 (usg-unix-v)

Jacob Bachmeyer <jcb62281@gmail.com> writes:

>> However, there are more errors still:
>>                 === launcher Summary ===
>> # of expected passes         5
>> # of unexpected failures     45
>> # of unsupported tests               2
> Can you post the launcher.log file?  The dejagnu script is fairly 
> simple, and I suspect that I may be able to deduce the causes of those 
> failures, especially if they are like the "report-card" failure that 
> follows.

After the fix for the expr foo : - issue, I've made some progress in
identifying what's still going wrong:

I now see

Running "env EXPECT=true TCLSH=true 
 foo -v -v" ...
Verbose level is 2
Running launcher from 
Probing directory 
Looking for commands in 
ERROR: could not resolve command dejagnu-foo
child process exited abnormally
FAIL: dejagnu foo as Tcl

Comparing sh -x output between Solaris 10 and 11, I found that the
difference starts in dejagnu at this point:

# Remove any leading autoconf platform prefix and the "dejagnu" prefix.
command=`basename "$0" | sed -e 's/^.*-\?dejagnu-\?//'`

* S10 or 11 with /usr/bin/sed:


* S11.3 with /usr/gnu/bin/sed:


The issue is the Solaris sed vs. GNU sed difference: /usr/bin/sed
behaves identically between Solaris 10 and 11, however GNU sed isn't
bundled with Solaris 10.

Solaris sed doesn't support ? in REs (cf. regexp(7)).  The Autoconf
manual documents

Portable @command{sed} regular expressions should use @samp{\} only to escape
characters in the string @samp{$()*.0123456789[\^n@{@}}.  For example,
alternation, @samp{\|}, is common but Posix does not require its
support, so it should be avoided in portable scripts.  Solaris
@command{sed} does not support alternation; e.g., @samp{sed '/a\|b/d'}
deletes only lines that contain the literal string @samp{a|b}.
Similarly, @samp{\+} and @samp{\?} should be avoided.

One can use \{0,1\} instead, but I cannot tell for certain how portable
that is:

diff --git a/dejagnu b/dejagnu
--- a/dejagnu
+++ b/dejagnu
@@ -147,7 +147,7 @@ if $want_version ; then
 # Remove any leading autoconf platform prefix and the "dejagnu" prefix.
-command=`basename "$0" | sed -e 's/^.*-\?dejagnu-\?//'`
+command=`basename "$0" | sed -e 's/^.*-\{0,1\}dejagnu-\{0,1\}//'`
 while expr $# \> 0 > /dev/null

With that fixed I ran into:

Found subcommand foo with variants:  tcl sh
grep: illegal option -- q
Usage: grep -hblcnsviw pattern file . . .
Selected variant tcl

grep -q isn't portable, too, also documented in the Autoconf manual:

Some of the options required by Posix are not portable in practice.
Don't use @samp{grep -q} to suppress output, because traditional @command{grep}
implementations (e.g., Solaris) do not support @option{-q}.

Using I/O redirection instead got me way further:

diff --git a/dejagnu b/dejagnu
--- a/dejagnu
+++ b/dejagnu
@@ -235,7 +235,7 @@ if $have_gawk ; then
 # is "awk" actually GNU Awk?
 if $have_awk ; then
-    if "$awkbin" --version | sed 1q | grep -qi 'GNU Awk' ; then
+    if "$awkbin" --version | sed 1q | grep -i 'GNU Awk' > /dev/null; then
@@ -406,8 +406,8 @@ if $want_help ; then
        echo ERROR: file "'$help_file'" is not readable
        exit 2
-    if grep -q '#help' "$help_file" \
-       && grep -q '#end' "$help_file"; then : ; else
+    if grep '#help' "$help_file" > /dev/null \
+       && grep '#end' "$help_file" > /dev/null; then : ; else
        echo ERROR: file "'$help_file'" does not contain a help message
        exit 2

Now I'm down to

FAIL: dejagnu --help works
FAIL: dejagnu foo --help works if shell variant selected

This only occurs when running runtest --tool launcher manually, but
works with make check.

ERROR: The 'man' command in Solaris does not work in the source tree.
FAIL: have no Awk
FAIL: have no GNU Awk
FAIL: have no Tcl
FAIL: have no Expect

Running "env AWK=bogus GAWK=bogus 
/vol/src/gnu/dejagnu/dejagnu-1.6.3-branch/local/dejagnu --DGTimpl awk" ...
child process exited abnormally
FAIL: have no Awk

Those FAILs happen because interp.exp expects exitcode 1 while we get
255 instead.  The autoconf manual documents this, too:

Don't expect @command{false} to exit with status 1: in native
Solaris @file{/bin/false} exits with status 255.

>>              === report-card Summary ===
>> # of unresolved testcases    2
>> Running 
>> /vol/src/gnu/dejagnu/dejagnu-1.6.3-rc2/testsuite/report-card.all/onetest
>> .exp ...
>> spawn /bin/sh -c cd 
>> /vol/gcc/obj/dejagnu/dejagnu-1.6.3-rc2/testsuite/report-card
>> .all/onetest && exec /vol/src/gnu/dejagnu/dejagnu-1.6.3-rc2/dejagnu 
>> report-card^
>> M
>> expr: syntax error
>> ERROR: could not resolve command dejagnu-report-card
>> There are obviously more hardcoded uses of /bin/sh here and elsewhere,
>> but I haven't looked for those yet.
> That hardcoded use of /bin/sh only changes directory and execs 
> $LAUNCHER, which should run with /bin/ksh if you have patched its #! line.
> The "dejagnu" script is run, but fails to locate the report-card 
> subcommand.  I would be interested in the output of "/bin/ksh -x 
> ./dejagnu report-card" in the source directory, assuming that "-x" 
> produces an execution trace from ksh as it does from bash (... and 
> likewise for Solaris 10 /bin/sh after applying the patch above to change 
> the use of the readonly command).  There are two likely candidates I see 
> for this error:  one is an `expr :` match to detect a leading "-" and 
> the other is a possibility that `expr $# \> 0` in a while loop test is 
> somehow being executed as `expr \> 0` under some condition.  Both of 
> these hypotheses imply unexpected behavior if not outright bugs in 
> Solaris 10.
> There is a possibility here that dejagnu may be tickling a bug in 
> Solaris 10 /bin/ksh and may work with /bin/sh, or may not work with 
> either of them.

When I retried this now, the report-card results are good:

                === report-card Summary ===

# of expected passes            245

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