[PATCH 0/3] hn/reftable "fixes" for OpenBSD

While building "seen" in OpenBSD, noticed the following issues as part of reftable support.

the first patch also affected Linux and was indeed one of the two reasons for the failed CI runs of that branch, hence why it might be worth squashing into the corresponding commit as the subject implies.

the second patch might be worth squashing as well, but neither address the segfault in t0031.14 which manifests as :

  2d732e1 refs/heads/primary@{9}: commit (initial): number 1
  ++ grep 'commit: number 10' output
  357ed45 refs/heads/primary@{0}: commit: number 10
  ++ git gc
  error: reflog died of signal 11
  fatal: failed to run reflog
  error: last command exited with $?=128
  not ok 14 - reflog, repack

and that correspond to a call of `git reflog expire --all` with the following backtrace :

  #0  hashmap_entry_init (hash=<optimized out>, e=0xbfba1384) at hashmap.h:317
  #1  hashmap_get_from_hash (keydata=0x0, hash=<optimized out>, map=0xa027208)
      at hashmap.h:378
  #2  oidmap_get (map=0xa027208, key=0x0) at oidmap.c:38
  #3  0x08202dae in do_lookup_replace_object (r=0x83fc180 <the_repo>, oid=0x0)
      at replace-object.c:76
  #4  0x081b59d3 in lookup_replace_object (oid=0x0, r=0x83fc180 <the_repo>)
      at replace-object.h:40
  #5  parse_object (r=0x83fc180 <the_repo>, oid=0x0) at object.c:271
  #6  0x08134e87 in lookup_commit_reference_gently (r=0x83fc180 <the_repo>,
      oid=0x0, quiet=1) at commit.c:35
  #7  0x080d6e39 in reflog_expiry_prepare (
      refname=0xa026fb4 "refs/heads/primary", oid=0x0, cb_data=0xbfba161c)
      at builtin/reflog.c:363
  #8  0x081f9325 in git_reftable_reflog_expire (ref_store=0xa026c40,
      refname=0xa026fb4 "refs/heads/primary", oid=0x0, flags=0,
      prepare_fn=0x80d6c80 <reflog_expiry_prepare>,
      should_prune_fn=0x80d72b0 <should_expire_reflog_ent>,
      cleanup_fn=0x80d6990 <reflog_expiry_cleanup>, policy_cb_data=0xbfba161c)
      at refs/reftable-backend.c:1511
  #9  0x081ef820 in refs_reflog_expire (policy_cb_data=0xbfba161c,
      cleanup_fn=0x80d6990 <reflog_expiry_cleanup>,
      should_prune_fn=0x80d72b0 <should_expire_reflog_ent>,
      prepare_fn=0x80d6c80 <reflog_expiry_prepare>, flags=0, oid=0x0,
      refname=0xa026fb4 "refs/heads/primary", refs=<optimized out>)
      at refs.c:2408
  #10 reflog_expire (refname=0xa026fb4 "refs/heads/primary", oid=0x0, flags=0,
      prepare_fn=0x80d6c80 <reflog_expiry_prepare>,
      should_prune_fn=0x80d72b0 <should_expire_reflog_ent>,
      cleanup_fn=0x80d6990 <reflog_expiry_cleanup>, policy_cb_data=0xbfba161c)
      at refs.c:2420
  #11 0x080d786f in cmd_reflog_expire (argc=<optimized out>,
      argv=<optimized out>, prefix=<optimized out>) at builtin/reflog.c:634
  #12 0x0804e9fb in run_builtin (argv=<optimized out>, argc=<optimized out>,
      p=<optimized out>) at git.c:461
  #13 handle_builtin (argc=3, argv=argv@entry=0xbfba2208) at git.c:716
  #14 0x0804edcb in run_argv (argv=0xbfba1ffc, argcp=0xbfba20a0) at git.c:783
  #15 cmd_main (argc=3, argv=0xbfba2204) at git.c:914
  #16 0x0804d8dc in main (argc=4, argv=0xbfba2204) at common-main.c:52

Carlo Marcelo Arenas Belón (3):
  fixup! Provide zlib's uncompress2 from compat/zlib-compat.c
  reftable: clarify zlib version dependency
  openbsd: allow reftable building with zlib 1.2.3

 Makefile         | 2 +-
 config.mak.uname | 1 +
 reftable/block.c | 4 +++-
 3 files changed, 5 insertions(+), 2 deletions(-)