checkpatch: add support to check already applied git commits

It's sometimes useful to scan already committed patches.

Add --git <revision range> to scan specific or multiple commits.

Single commits are scanned with
	--git <rev>
Multiple commits are scanned with
	--git <range>
	--git <commit>-<count>

[joe@perches.com:
o Don't exec git for each <commit>-<count>,
  use a single "git log -<count> <commit>"
o Consolidate the git exec for the <range> and <commit>-<count> variants
o Output 12 character commit hash ids
o Don't scan git commit merges
o Use -M to reduce the size of rename commits]

Signed-off-by: "Du, Changbin" <changbin.du@intel.com>
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index c5a3c95..8fc9edd 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -27,6 +27,7 @@ my $emacs = 0;
 my $terse = 0;
 my $showfile = 0;
 my $file = 0;
+my $git = 0;
 my $check = 0;
 my $check_orig = 0;
 my $summary = 1;
@@ -69,6 +70,16 @@ Options:
   --emacs                    emacs compile window format
   --terse                    one line per report
   --showfile                 emit diffed file position, not input file position
+  -g, --git                  treat FILE as a single commit or git revision range
+                             single git commit with:
+                               <rev>
+                               <rev>^
+                               <rev>~n
+                             multiple git commits with:
+                               <rev1>..<rev2>
+                               <rev1>...<rev2>
+                               <rev>-<count>
+                             git merges are ignored
   -f, --file                 treat FILE as regular source file
   --subjective, --strict     enable more subjective tests
   --list-types               list the possible message types
@@ -174,6 +185,7 @@ GetOptions(
        'terse!'        => \$terse,
        'showfile!'     => \$showfile,
        'f|file!'       => \$file,
+       'g|git!'        => \$git,
        'subjective!'   => \$check,
        'strict!'       => \$check,
        'ignore=s'      => \@ignore,
@@ -788,10 +800,42 @@ my @fixed_inserted = ();
 my @fixed_deleted = ();
 my $fixlinenr = -1;
 
+# If input is git commits, extract all commits from the commit expressions.
+# For example, HEAD-3 means we need check 'HEAD, HEAD~1, HEAD~2'.
+die "$P: No git repository found\n" if ($git && !-e ".git");
+
+if ($git) {
+       my @commits = ();
+       for my $commit_expr (@ARGV) {
+               my $git_range;
+               if ($commit_expr =~ m/-/) {
+                       my @tmp = split(/-/, $commit_expr);
+                       die "$P: incorrect git commits expression $commit_expr$!\n"
+                           if (@tmp != 2);
+                       $git_range = "-$tmp[1] $tmp[0]";
+               } elsif ($commit_expr =~ m/\.\./) {
+                       $git_range = "$commit_expr";
+               }
+               if (defined $git_range) {
+                       my $lines = `git log --no-merges --pretty=format:'%H' $git_range`;
+                       foreach my $line (split(/\n/, $lines)) {
+                               unshift(@commits, $line);
+                       }
+               } else {
+                       unshift(@commits, $commit_expr);
+               }
+       }
+       die "$P: no git commits after extraction!\n" if (@commits == 0);
+       @ARGV = @commits;
+}
+
 my $vname;
 for my $filename (@ARGV) {
        my $FILE;
-       if ($file) {
+       if ($git) {
+               open($FILE, '-|', "git format-patch -M --stdout -1 $filename") ||
+                       die "$P: $filename: git format-patch failed - $!\n";
+       } elsif ($file) {
                open($FILE, '-|', "diff -u /dev/null $filename") ||
                        die "$P: $filename: diff failed - $!\n";
        } elsif ($filename eq '-') {
@@ -802,6 +846,8 @@ for my $filename (@ARGV) {
        }
        if ($filename eq '-') {
                $vname = 'Your patch';
+       } elsif ($git) {
+               $vname = "Commit " . substr($filename, 0, 12) . `git log -1 --pretty=format:' ("%s")' $filename`;
        } else {
                $vname = $filename;
        }