checksrc: repair the copyrightyear check

- Consider a modified file to be committed this year.

- Make the travis CHECKSRC also do COPYRIGHTYEAR scan in examples and
  includes

- Ignore 0 parents when getting latest commit date of file.

since in the CI we're dealing with a truncated repo of last 50 commits,
the file's most recent commit may not be available. when this happens
git log and rev-list show the initial commit (ie first commit not to be
truncated) but that's incorrect so ignore it.

Ref: https://github.com/curl/curl/pull/4547

Closes https://github.com/curl/curl/pull/4549

Co-authored-by: Jay Satiro

1 files changed, 2 insertions, 0 deletions

diff --git a/.travis.yml b/.travis.yml
index 3c4fb43e5..73ac0fb01 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -609,6 +609,8 @@ script:
                 make test-nonflaky
              fi
              if [ -n $CHECKSRC ]; then
+                echo "enable COPYRIGHTYEAR" > ./docs/examples/.checksrc
+                echo "enable COPYRIGHTYEAR" > ./include/curl/.checksrc
                 make checksrc
              fi
         fi