checkpatch: check for misuse of the link tags

"Link:" and "Closes:" tags have to be used with public URLs.

It is difficult to make sure the link is public but at least we can verify
the tag is followed by 'http(s)://'.

With that, we avoid such a tag that is not allowed [1]:

  Closes: <number>
Now that we check the "link" tags are followed by a URL, we can relax the
check linked to "Reported-by being followed by a link tag" to only verify
if a "link" tag is present after the "Reported-by" one.

Link: https://lore.kernel.org/linux-doc/CAHk-=wh0v1EeDV3v8TzK81nDC40=XuTdY2MCr0xy3m3FiBV3+Q@mail.gmail.com/
Link: https://lkml.kernel.org/r/20230314-doc-checkpatch-closes-tag-v4-5-d26d1fa66f9f@tessares.net
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Acked-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Bagas Sanjaya <bagasdotme@gmail.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@gmail.com>
Cc: Dwaipayan Ray <dwaipayanray1@gmail.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kai Wasserbäch <kai@dev.carbon-project.org>
Cc: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Cc: Thorsten Leemhuis <linux@leemhuis.info>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 922428ee3be5710aef2f8632ff5eb3ee3053f7c2..3e6f5a8614d3687cf470118a7701855cacdeb850 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -3179,7 +3179,7 @@ sub process {
                                if (!defined $lines[$linenr]) {
                                        WARN("BAD_REPORTED_BY_LINK",
                                             "Reported-by: should be immediately followed by Closes: with a URL to the report\n" . $herecurr . "\n");
-                               } elsif ($rawlines[$linenr] !~ m{^closes:\s*https?://}i) {
+                               } elsif ($rawlines[$linenr] !~ /^closes:\s*/i) {
                                        WARN("BAD_REPORTED_BY_LINK",
                                             "Reported-by: should be immediately followed by Closes: with a URL to the report\n" . $herecurr . $rawlines[$linenr] . "\n");
                                }
@@ -3292,6 +3292,17 @@ sub process {
                        }
                }
 
+# Check for misuse of the link tags
+               if ($in_commit_log &&
+                   $line =~ /^\s*(\w+:)\s*(\S+)/) {
+                       my $tag = $1;
+                       my $value = $2;
+                       if ($tag =~ /^$link_tags_search$/ && $value !~ m{^https?://}) {
+                               WARN("COMMIT_LOG_WRONG_LINK",
+                                    "'$tag' should be followed by a public http(s) link\n" . $herecurr);
+                       }
+               }
+
 # Check for lines starting with a #
                if ($in_commit_log && $line =~ /^#/) {
                        if (WARN("COMMIT_COMMENT_SYMBOL",