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config/install-sh

@@ -56,7 +56,7 @@ dir_arg=""
 
 while [ x"$1" != x ]; do
     case $1 in
-	-c) instcmd="$cpprog"
+	-c) instcmd=$cpprog
 	    shift
 	    continue;;
 
@@ -79,7 +79,7 @@ while [ x"$1" != x ]; do
 	    shift
 	    continue;;
 
-	-s) stripcmd="$stripprog"
+	-s) stripcmd=$stripprog
 	    shift
 	    continue;;
 
@@ -106,7 +106,7 @@ done
 
 if [ x"$src" = x ]
 then
-	echo "install:	no input file specified"
+	echo "$0: no input file specified" >&2
 	exit 1
 else
 	:
@@ -116,7 +116,7 @@ if [ x"$dir_arg" != x ]; then
 	dst=$src
 	src=""
 
-	if [ -d $dst ]; then
+	if [ -d "$dst" ]; then
 		instcmd=:
 		chmodcmd=""
 	else
@@ -132,13 +132,13 @@ else
 	then
 		:
 	else
-		echo "install:  $src does not exist"
+		echo "$0: $src does not exist" >&2
 		exit 1
 	fi
 
 	if [ x"$dst" = x ]
 	then
-		echo "install:	no destination specified"
+		echo "$0: no destination specified" >&2
 		exit 1
 	else
 		:
@@ -147,16 +147,16 @@ else
 # If destination is a directory, append the input filename; if your system
 # does not like double slashes in filenames, you may need to add some logic
 
-	if [ -d $dst ]
+	if [ -d "$dst" ]
 	then
-		dst="$dst"/`basename $src`
+		dst=$dst/`basename "$src"`
 	else
 		:
 	fi
 fi
 
 ## this sed command emulates the dirname command
-dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
+dstdir=`echo "$dst" | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
 
 # Make sure that the destination directory exists.
 #  this part is taken from Noah Friedman's mkinstalldirs script
@@ -165,48 +165,48 @@ dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
 if [ ! -d "$dstdir" ]; then
 defaultIFS='
 	'
-IFS="${IFS-${defaultIFS}}"
+IFS="${IFS-$defaultIFS}"
 
-oIFS="${IFS}"
+oIFS=$IFS
 # Some sh's can't handle IFS=/ for some reason.
 IFS='%'
-set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
+set - `echo "$dstdir" | sed -e 's@/@%@g' -e 's@^%@/@'`
-IFS="${oIFS}"
+IFS=$oIFS
 
 pathcomp=''
 
 while [ $# -ne 0 ] ; do
-	pathcomp="${pathcomp}${1}"
+	pathcomp=$pathcomp$1
 	shift
 
-	if [ ! -d "${pathcomp}" ] ;
+	if [ ! -d "$pathcomp" ] ;
         then
-		$mkdirprog "${pathcomp}"
+		$mkdirprog "$pathcomp"
 	else
 		:
 	fi
 
-	pathcomp="${pathcomp}/"
+	pathcomp=$pathcomp/
 done
 fi
 
 if [ x"$dir_arg" != x ]
 then
-	$doit $instcmd $dst &&
+	$doit $instcmd "$dst" &&
 
-	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst; else : ; fi &&
+	if [ x"$chowncmd" != x ]; then $doit $chowncmd "$dst"; else : ; fi &&
-	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst; else : ; fi &&
+	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd "$dst"; else : ; fi &&
-	if [ x"$stripcmd" != x ]; then $doit $stripcmd $dst; else : ; fi &&
+	if [ x"$stripcmd" != x ]; then $doit $stripcmd "$dst"; else : ; fi &&
-	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst; else : ; fi
+	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd "$dst"; else : ; fi
 else
 
 # If we're going to rename the final executable, determine the name now.
 
 	if [ x"$transformarg" = x ]
 	then
-		dstfile=`basename $dst`
+		dstfile=`basename "$dst"`
 	else
-		dstfile=`basename $dst $transformbasename | 
+		dstfile=`basename "$dst" $transformbasename |
 			sed $transformarg`$transformbasename
 	fi
 
@@ -214,20 +214,24 @@ else
 
 	if [ x"$dstfile" = x ]
 	then
-		dstfile=`basename $dst`
+		dstfile=`basename "$dst"`
 	else
 		:
 	fi
 
-# Make a temp file name in the proper directory.
+# Make a couple of temp file names in the proper directory.
 
 	dsttmp=$dstdir/#inst.$$#
+	rmtmp=$dstdir/#rm.$$#
+
+# Trap to clean up temp files at exit.
+
+	trap 'status=$?; rm -f "$dsttmp" "$rmtmp" && exit $status' 0
+	trap '(exit $?); exit' 1 2 13 15
 
 # Move or copy the file name to the temp name
 
-	$doit $instcmd $src $dsttmp &&
+	$doit $instcmd "$src" "$dsttmp" &&
-
-	trap "rm -f ${dsttmp}" 0 &&
 
 # and set any options; do chmod last to preserve setuid bits
 
@@ -235,17 +239,38 @@ else
 # ignore errors from any of these, just make sure not to ignore
 # errors from the above "$doit $instcmd $src $dsttmp" command.
 
-	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else :;fi &&
+	if [ x"$chowncmd" != x ]; then $doit $chowncmd "$dsttmp"; else :;fi &&
-	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else :;fi &&
+	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd "$dsttmp"; else :;fi &&
-	if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else :;fi &&
+	if [ x"$stripcmd" != x ]; then $doit $stripcmd "$dsttmp"; else :;fi &&
-	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else :;fi &&
+	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd "$dsttmp"; else :;fi &&
+
+# Now remove or move aside any old file at destination location.  We try this
+# two ways since rm can't unlink itself on some systems and the destination
+# file might be busy for other reasons.  In this case, the final cleanup
+# might fail but the new file should still install successfully.
+
+{
+	if [ -f "$dstdir/$dstfile" ]
+	then
+		$doit $rmcmd -f "$dstdir/$dstfile" 2>/dev/null ||
+		$doit $mvcmd -f "$dstdir/$dstfile" "$rmtmp" 2>/dev/null ||
+		{
+		  echo "$0: cannot unlink or rename $dstdir/$dstfile" >&2
+		  (exit 1); exit
+		}
+	else
+		:
+	fi
+} &&
 
 # Now rename the file to the real destination.
 
-	$doit $rmcmd -f $dstdir/$dstfile &&
+	$doit $mvcmd "$dsttmp" "$dstdir/$dstfile"
-	$doit $mvcmd $dsttmp $dstdir/$dstfile 
 
 fi &&
 
+# The final little trick to "correctly" pass the exit status to the exit trap.
 
-exit 0
+{
+	(exit 0); exit
+}