[Bug 2954638]: Correct behaviour of manual page installer. Also added armouring

to check that assumptions about the initial state are actually valid (e.g.,
look for existing input file).

1 files changed, 76 insertions, 27 deletions

diff --git a/unix/installManPage b/unix/installManPage
index 993d097..e636db7 100755
--- a/unix/installManPage
+++ b/unix/installManPage
@@ -1,12 +1,29 @@
 #!/bin/sh
 
-ZIP=:
+########################################################################
+### Parse Options
+###
+
+Gzip=:
+SymOrLoc=""
+Gz=""
+Suffix=""
+
 while true; do
     case $1 in
-        -s | --symlinks  )      S="-s ";;
-        -z | --compress  )    ZIP=$2;  shift ;;
-	-e | --extension )      Z=$2;  shift ;;
-	-s | --suffix    ) SUFFIX=$2;  shift ;;
+        -s | --symlinks  ) SymOrLoc="-s "      ;;
+        -z | --compress  )     Gzip=$2;  shift ;;
+	-e | --extension )       Gz=$2;  shift ;;
+	-x | --suffix    )   Suffix=$2;  shift ;;
+	-*) cat <<EOF
+Unknown option "$1". Supported options:
+    -s         Use symbolic links for manpages with multiple names.
+    -z PROG    Use PROG to compress manual pages.
+    -e EXT     Defines the extension added by -z PROG when compressing.
+    -x SUFF    Defines an extra extension suffix to use.
+Option names may not be combined getopt-style.
+EOF
+	    exit 1 ;;
 	*)  break ;;
     esac
     shift
@@ -16,16 +33,32 @@ if test "$#" != 2; then
     exit 1
 fi
 
-MANPAGE=$1
-DIR=$2
-test -z "$S" && S="$DIR/"
+########################################################################
+### Parse Required Arguments
+###
+
+ManPage=$1
+Dir=$2
+if test -f $ManPage ; then : ; else
+    echo "source manual page file must exist"
+    exit 1
+fi
+if test -d $Dir ; then : ; else
+    echo "target directory must exist"
+    exit 1
+fi
+test -z "$SymOrLoc" && SymOrLoc="$Dir/"
+
+########################################################################
+### Extract Target Names from Manual Page
+###
 
 # A sed script to parse the alternative names out of a man page.
 #
 # Backslashes are trippled in the sed script, because it is in
 # backticks which doesn't pass backslashes literally.
 #
-NAMES=`sed -n '
+Names=`sed -n '
 #                               Look for a line, that starts with .SH NAME
 #                               optionally allow NAME to be surrounded
 #                               by quotes.
@@ -40,28 +73,44 @@ NAMES=`sed -n '
 	s/ \\\-.*//
 #                               print the result and exit
 	p;q
-    }' $MANPAGE`
+    }' $ManPage`
+
+if test -z $Names ; then
+    echo "warning: no target names found in $ManPage"
+fi
 
-case $MANPAGE in
-    *.1) SECTION=1 ;;
-    *.3) SECTION=3 ;;
-    *.n) SECTION=n ;;
+########################################################################
+### Remaining Set Up
+###
+
+case $ManPage in
+    *.1) Section=1 ;;
+    *.3) Section=3 ;;
+    *.n) Section=n ;;
+    *)	echo "unknown section for $ManPage"
+	exit 2 ;;
 esac
 
-SRCDIR=`dirname $MANPAGE`
+SrcDir=`dirname $ManPage`
+
+########################################################################
+### Process Page to Create Target Pages
+###
 
-FIRST=""
-for f in $NAMES; do
-    f=$f.$SECTION$SUFFIX
-    if test -z "$FIRST" ; then
-	FIRST=$f
-	rm -f $DIR/$FIRST $DIR/$FIRST.*
-	sed -e "/man\.macros/r $SRCDIR/man.macros" -e "/man\.macros/d" \
-	    $MANPAGE > $DIR/$FIRST
-	chmod 444 $DIR/$FIRST
-	$ZIP $DIR/$FIRST
+First=""
+for Target in $Names; do
+    Target=$Target.$Section$Suffix
+    rm -f $Dir/$Target $Dir/$Target.*
+    if test -z "$First" ; then
+	First=$Target
+	sed -e "/man\.macros/r $SrcDir/man.macros" -e "/man\.macros/d" \
+	    $ManPage > $Dir/$First
+	chmod 444 $Dir/$First
+	$Gzip $Dir/$First
     else
-	rm -f $DIR/$f $DIR/$f.*
-	ln $S$FIRST$Z $DIR/$f$Z
+	ln $SymOrLoc$First$Gz $Dir/$Target$Gz
     fi
 done
+
+########################################################################
+exit 0