Bug#531595: [tex-live] Supporting old releases: Using LaTeX after more than 5 years

[Norbert Preining <preining@logic.at>]

Hi Karl, hi all,

together with Frank we have developped a patch for fmtutil that deals
with the following problem:

On So, 07 Jun 2009, Frank Küster wrote:
> Now if we look more closely, it turns out that LaTeX issues only a
> *warning* if you read the text.  However, the lines are prepended with
> "! ", and therefore are treated as errors by fmtutil.  In other words,
> the LaTeX format can be built fine even after 5 years have passed. But
> fmtutil won't accept it as cleanly built.

The idea is that *if* a fmt file was generated and the string
	'! '
(without ') are found at the beginning of a line then this was only a
*warning* and no error.

Currently fmtutil does in this case:
	log_failure "pdftex -ini ... possibly failed."
and log_failure triggers and return value of > 0, which turns out as
error.

We have changed fmtutil by adding a new logging facility
	log_warning
(all paralleling log_failure) that is used instead. Messages generated
from this will not change the exit value, but will be reported at the
end.

I attach the patch against current TeX Live's fmtutil in
Build/source/texk/tetex/fmtutil.

Please comment, esp. if you (I am having my Debian hat on) will accept
that patch into the upstream source.

Thanks a lot

Norbert

-------------------------------------------------------------------------------
Dr. Norbert Preining <preining@logic.at>        Vienna University of Technology
Debian Developer <preining@debian.org>                         Debian TeX Group
gpg DSA: 0x09C5B094      fp: 14DF 2E6C 0307 BE6D AD76  A9C0 D2BF 4AA3 09C5 B094
-------------------------------------------------------------------------------
HUCKNALL (vb.)
To crouch upwards: as in the movement of a seated person's feet and
legs made in order to allow a cleaner's hoover to pass beneath them.
			--- Douglas Adams, The Meaning of Liff

Index: fmtutil
===================================================================
--- fmtutil	(revision 13706)
+++ fmtutil	(working copy)
@@ -259,6 +259,23 @@
 ###############################################################################
 byebye()
 {
+  if $has_warnings; then
+    {
+      cat <<eof
+
+###############################################################################
+$progname: Warning! Some warnings have been issued.
+Visit the log files in directory
+  $destdir
+for details.
+###############################################################################
+
+This is a summary of all \`warning' messages:
+$log_warning_msg
+eof
+    } >&2
+  fi
+
   if $has_errors; then
     {
       cat <<eof
@@ -270,7 +287,7 @@
 for details.
 ###############################################################################
 
-This is a summary of all \`failed' messages and warnings:
+This is a summary of all \`failed' messages:
 $log_failure_msg
 eof
     } >&2
@@ -281,6 +298,16 @@
 }
 
 ###############################################################################
+# init_log_warning()
+#   reset the list of warning messages
+###############################################################################
+init_log_warning()
+{
+  log_warning_msg=
+  has_warnings=false
+}
+
+###############################################################################
 # init_log_failure()
 #   reset the list of failure messages
 ###############################################################################
@@ -291,6 +318,24 @@
 }
 
 ###############################################################################
+# log_warning(errmsg)
+#   report and save warning message `errmsg'
+###############################################################################
+log_warning()
+{
+  echo "Warning: $@" >&2
+  if test -z "$log_warning_msg"; then
+    log_warning_msg="$@"
+  else
+    OLDIFS=$IFS; IFS=
+    log_warning_msg="$log_warning_msg
+$@"
+    IFS=$OLDIFS
+  fi
+  has_warnings=true
+}
+
+###############################################################################
 # log_failure(errmsg)
 #   report and save failure message `errmsg'
 ###############################################################################
@@ -547,6 +592,7 @@
 
   cache_vars
   init_log_failure
+  init_log_warning
   # execute the desired command:
   case "$cmd" in 
     all)
@@ -706,7 +752,7 @@
   mkdir -p "$fulldestdir"
   if test -f $fmtfile; then
     grep '^! ' $format.log >/dev/null 2>&1 &&
-      log_failure "\`$engine -ini $tcxflag $jobswitch $prgswitch $texargs' possibly failed."
+      log_warning "\`$engine -ini $tcxflag $jobswitch $prgswitch $texargs' possibly failed."
 
     # We don't want user-interaction for the following "mv" commands:
     mv "$format.log" "$fulldestdir/$format.log" </dev/null