Many scripts compare actual and expected output using
"diff -u". This is nicer than "cmp" because the output shows
how the two differ. However, not all versions of diff
understand -u, leading to unnecessary test failure.
This adds a test_cmp function to the test scripts and
switches all "diff -u" invocations to use it. The function
uses the contents of "$GIT_TEST_CMP" to compare its
arguments; the default is "diff -u".
On systems with a less-capable diff, you can do:
GIT_TEST_CMP=cmp make test
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
When we consider if a path has been totally rewritten, we did not
touch changes from symlinks to files or vice versa. But a change
that modifies even the type of a blob surely should count as a
complete rewrite.
While we are at it, modernise diffcore-break to be aware of gitlinks (we
do not want to touch them).
Signed-off-by: Junio C Hamano <gitster@pobox.com>
