Preventing committing conflicts

[Tommi Vainikainen <thv+debian@iki.fi>]

Here is a patch to commit_prep2 to check conflicts and prevent
commiting conflicts.  I don't dare to commit this myself, so if
someone wants to verify this is correct and commit_prep2 really works
after patching, (s)he can commit this one.  After committing also add
"-c" parameter to commit_prep2 in commitinfo so it really checks for
conflicts too.

Index: commit_prep2
===================================================================
RCS file: /cvs/webwml/CVSROOT/commit_prep2,v
retrieving revision 1.2
diff -u -r1.2 commit_prep2
--- commit_prep2	2001/04/08 17:16:25	1.2
+++ commit_prep2	2001/05/29 18:46:42
@@ -1,4 +1,4 @@
-#!/usr/bin/perl
+#! /usr/bin/perl
 # -*-Perl-*-
 #
 #ident	"@(#)cvs/contrib:$Name:  $:$Id: commit_prep2,v 1.2 2001/04/08 17:16:25 joey Exp $"
@@ -9,20 +9,19 @@
 # existence of a RCS "Id" keyword in the first ten lines of the file.
 # For existing files, it checks version number in the "Id" line to
 # prevent losing changes because an old version of a file was copied
-# into the direcory.
+# into the direcory.  Also check for unresolved merge conflicts.
 #
 # Possible future enhancements:
 #
-#    Check for cruft left by unresolved conflicts.  Search for
-#    "^<<<<<<<$", "^-------$", and "^>>>>>>>$".
-#
 #    Look for a copyright and automagically update it to the
 #    current year.  [[ bad idea!  -- woods ]]
 #
 #
 # Contributed by David Hampton <hampton@cisco.com>
-#
 # Hacked on lots by Greg A. Woods <woods@web.net>
+# Conflict check by Charles M. Hannum <mycroft@netbsd.org>
+# Merged Hannum's conflict checks with RCS Id checking by Tommi
+# Vainikainen <thv@iki.fi>
 
 #
 #	Configurable options
@@ -77,6 +76,22 @@
     close(FILE);
 }
 
+sub check_conflicts {
+    local($directory, $filename) = @_;
+
+    if (open(FILE, "<$filename")) {
+	while (<FILE>) {
+	    if (/^<<<<<<<$/ || /^>>>>>>>$/) {
+		print $directory . "/" . $filename . ":\n";
+		print "  This file contains unresolved merge conflicts.\n";
+		return(1);
+	    }
+	}
+    }
+    close(FILE);
+    return(0);
+}
+
 sub check_version {
     local($i, $id, $rname, $version);
     local($filename, $cvsversion) = @_;
@@ -148,6 +163,10 @@
 
 $id = getpgrp();		# You *must* use a shell that does setpgrp()!
 
+# Check each file (except dot files)
+#
+$check_conflicts = 0;
+
 # Check each file (except dot files) for an RCS "Id" keyword.
 #
 $check_id = 0;
@@ -165,11 +184,13 @@
 	$debug = 1;
 	print STDERR "Debug turned on...\n";
     } elsif ($arg eq '-c') {
+	$check_conflicts = 1;
+    } elsif ($arg eq '-i') {
 	$check_id = 1;
     } elsif ($arg eq '-r') {
 	$record_directory = 1;
     } else {
-	push(@files, $arg);
+	push(@files, split(' ', $arg));
     }
 }
 
@@ -181,6 +202,16 @@
     print STDERR "id    - ", $id, "\n";
 }
 
+$failed = 0;
+
+# Now check each file name passed in for unresolved merge conflicts.
+#
+if ($check_conflicts != 0) {
+    foreach $filename (@files) {
+	$failed += &check_conflicts($directory, $filename);
+    }
+}
+    
 # Suck in the CVS/Entries file
 #
 open(ENTRIES, $ENTRIES) || die("Cannot open $ENTRIES.\n");
@@ -193,17 +224,17 @@
 # are considered to be administrative files by this script.
 #
 if ($check_id != 0) {
-    $failed = 0;
     foreach $arg (@files) {
 	if (index($arg, ".") == 0) {
 	    next;
 	}
 	$failed += &check_version($arg);
-    }
-    if ($failed) {
-	print STDERR "\n";
-	exit(1);
     }
+}
+
+if ($failed) {
+    print STDERR "\n";
+    exit(1);
 }
 
 # Record this directory as the last one checked.  This will be used

-- 
Tommi Vainikainen