[PATCH 0/7] Fix all leaks in t0001

This series fixes (or annotates) all the memory leaks that can cause t0001 to fail when run with LeakSanitizer (t0000 already passes without failures).

I suspect that none of these leaks had any user impact, and I'm aware that every change does cause some noise - I would have no objections to abandoning this series if it's not deemed valuable enough. On the other hand: fixing or suppressing these leaks should make it easier to spot leaks that have more significant user impact (it's entirely plausible that no real impactful leaks exist).

Note: this series does not guarantee that there are no leaks within
t0000-t0001, it only fixes those leaks which cause test failures. There is
at least one test case in t0000 where git is invoked in a subshell, and the
return value is ignored - meaning that a memory leak that is occuring during
that invocation does not cause tests to fail (I'm still trying to figure out
if that's something that's worth fixing - but that's probably a topic for a
separate thread):
https://git.kernel.org/pub/scm/git/git.git/tree/t/t0000-basic.sh#n1285

In case anyone is interested: I have been using the following workflow to find leaks and verify fixes - I'm running into crashes when using LSAN standalone, therefore I'm using full ASAN instead (I'm not particularly concerned about this: LSAN standalone mode is known to be less-well tested than leak-checking within ASAN [1], and the crashes are occurring within the leak-checker itself):

make GIT_TEST_OPTS="-i -v" DEFAULT_TEST_TARGET="t0000-basic.sh" ASAN_OPTIONS="detect_leaks=1:abort_on_error=1" SANITIZE=address DEVELOPER=1 CFLAGS="-DSUPPRESS_ANNOTATED_LEAKS -g -fno-optimize-sibling-calls -O1 -fno-omit-frame-pointer" test

(I then rerun the entire test suite with ASAN but with leak-checking disabled in order to gain some confidence that my fixes aren't inadvertently introducing memory safety issues.)

[1] https://github.com/google/sanitizers/wiki/AddressSanitizerLeakSanitizer#stand-alone-mode

Andrzej Hunt (7):
  symbolic-ref: don't leak shortened refname in check_symref()
  reset: free instead of leaking unneeded ref
  clone: free or UNLEAK further pointers when finished
  worktree: fix leak in dwim_branch()
  init: remove git_init_db_config() while fixing leaks
  init-db: silence template_dir leak when converting to absolute path
  parse-options: don't leak alias help messages

 builtin/clone.c        | 13 ++++++++++---
 builtin/init-db.c      | 32 ++++++++++----------------------
 builtin/reset.c        |  2 +-
 builtin/symbolic-ref.c | 12 +++++++++---
 builtin/worktree.c     | 12 ++++++------
 parse-options.c        | 29 ++++++++++++++++++++++++-----
 6 files changed, 60 insertions(+), 40 deletions(-)

base-commit: be7935ed8bff19f481b033d0d242c5d5f239ed50
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-899%2Fahunt%2Fleaksan-t0001-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-899/ahunt/leaksan-t0001-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/899