[PATCH] t/known-leaky: add list of known-leaky test scripts

["Martin Ågren" <martin.agren@gmail.com>]

Here's what a list of known leaks might look like. It feels a bit
awkward to post a known-incomplete list (I don't run all tests). Duy
offered to pick up the ball if I gave up, maybe you could complete and
post this as your own? :-? Even if I (or others) can't reproduce the
complete list locally, regressions will be trivial to find, and newly
leak-free tests fairly easy to notice.

I'm not sure if the shamelessly stolen shell snippets warrant their own
scripts, or how make targets overriding various variables would be
received. At least they're in the commit message.

-- >8 --
We have quite a lot of leaks in the code base. Using SANITIZE=leak, it
is easy to find them, and every now and then we simply stumble upon one.
Still, we can expect it to take some time to get to the point where
`make SANITIZE=leak test` succeeds.

Until that happens, it would be nice if we could at least try not to
regress in the sense that a test tXXXX which was at one point leak-free
turns leaky. Such a regression would indicate that leak-free code
turned leaky, that a new feature is leaky, or that we simply happen to
trigger an existing leak as part of a newly added/modified test.

To that end, introduce a list of known-leaky tests, i.e., a list of
tXXXX-values. Now this will be able to find such regressions:

    make SANITIZE=leak test GIT_SKIP_TESTS="$(cat t/known-leaky)"

The list was generated, and can be updated, as follows:

    # Assume we're using prove, which will keep running after failure,
    # and will record the results for us to parse (using "--state=").
    # Otherwise use "make -k" and grep in t/test-results.
    GIT_TEST_OPTS=-i make SANITIZE=leak test
    cd t
    prove --dry --state=failed |
    perl -lne '/^(t[0-9]{4})-.*\.sh$/ and print $1' |
    sort >known-leaky

The list added in this commit might be incomplete, since I do not run
all tests (I'm missing svn, cvs, p4, Windows-only and
filesystem-dependent tests, as well as "writeable /"). The majority of
these do not primarily test our C code, but all of them might trigger
leaks, in which case they would belong in this list.

Suggested-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 t/known-leaky | 539 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 539 insertions(+)
 create mode 100644 t/known-leaky

diff --git a/t/known-leaky b/t/known-leaky
new file mode 100644
index 0000000000..80a0af4d09
--- /dev/null
+++ b/t/known-leaky
@@ -0,0 +1,539 @@
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-- 
2.16.1.72.g5be1f00a9a