[PATCH v4 5/5] checkpatch: check for misuse of the link tags

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"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@xxxxxxxxxxxxxx/ [1]
Signed-off-by: Matthieu Baerts <matthieu.baerts@xxxxxxxxxxxx>
---
v4:
- Relax "Reported-by being followed by a link tag" check
- Check for "http(s)://" not just "http(s):"

v3:
- new patch addressing Linus' concerns.
---
 scripts/checkpatch.pl | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f8a57f400570..6d602c61d72a 100755
--- 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",

-- 
2.39.2




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