Re: [PATCH v5 00/11] config: remove global state from config iteration

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Hi Glen

Sorry it has taken me so long to look at these patches. I see they're in master now but I have just had a quick look through anyway and they looked good. It would definitely be nice to fix the hacky handling of "git checkout --conflict" at some point but that is a long standing problem and not the fault of this series.

Best Wishes

Phillip

On 28/06/2023 20:26, Glen Choo via GitGitGadget wrote:
As promised, this version addresses the comments on v3.

= Changes since v4

- Squash 6-7/12 since `test_must_fail` doesn't catch BUG()
- Move a hunk to later in the series where it belongs
- Replace a memcpy with `*a = *b`

= Changes since v3

- Rebase onto newer 'master'
- Move the 'remove UNUSED from tr2_cfg_cb' hunk from 9/12 -> 8/12. It should
   have been there all along; v3 8/12 didn't build at all.


Glen Choo (11):
   config: inline git_color_default_config
   urlmatch.h: use config_fn_t type
   config: add ctx arg to config_fn_t
   config.c: pass ctx in configsets
   config: pass ctx with config files
   config.c: pass ctx with CLI config
   trace2: plumb config kvi
   config: pass kvi to die_bad_number()
   config.c: remove config_reader from configsets
   config: add kvi.path, use it to evaluate includes
   config: pass source to config_parser_event_fn_t

  alias.c                                       |   3 +-
  archive-tar.c                                 |   5 +-
  archive-zip.c                                 |   1 +
  builtin/add.c                                 |   8 +-
  builtin/blame.c                               |   5 +-
  builtin/branch.c                              |   8 +-
  builtin/cat-file.c                            |   5 +-
  builtin/checkout.c                            |  12 +-
  builtin/clean.c                               |   9 +-
  builtin/clone.c                               |  11 +-
  builtin/column.c                              |   3 +-
  builtin/commit-graph.c                        |   3 +-
  builtin/commit.c                              |  20 +-
  builtin/config.c                              |  72 ++-
  builtin/difftool.c                            |   5 +-
  builtin/fetch.c                               |  13 +-
  builtin/fsmonitor--daemon.c                   |  11 +-
  builtin/grep.c                                |  12 +-
  builtin/help.c                                |   5 +-
  builtin/index-pack.c                          |   9 +-
  builtin/log.c                                 |  12 +-
  builtin/merge.c                               |   7 +-
  builtin/multi-pack-index.c                    |   1 +
  builtin/pack-objects.c                        |  19 +-
  builtin/patch-id.c                            |   5 +-
  builtin/pull.c                                |   5 +-
  builtin/push.c                                |   5 +-
  builtin/read-tree.c                           |   5 +-
  builtin/rebase.c                              |   5 +-
  builtin/receive-pack.c                        |  15 +-
  builtin/reflog.c                              |   7 +-
  builtin/remote.c                              |  15 +-
  builtin/repack.c                              |   5 +-
  builtin/reset.c                               |   5 +-
  builtin/send-pack.c                           |   5 +-
  builtin/show-branch.c                         |   8 +-
  builtin/stash.c                               |   5 +-
  builtin/submodule--helper.c                   |   3 +-
  builtin/tag.c                                 |   9 +-
  builtin/var.c                                 |   5 +-
  builtin/worktree.c                            |   5 +-
  bundle-uri.c                                  |   9 +-
  color.c                                       |   8 -
  color.h                                       |   6 +-
  compat/mingw.c                                |   3 +-
  compat/mingw.h                                |   4 +-
  config.c                                      | 552 +++++++-----------
  config.h                                      |  80 ++-
  connect.c                                     |   4 +-
  .../coccinelle/config_fn_ctx.pending.cocci    | 144 +++++
  contrib/coccinelle/git_config_number.cocci    |  27 +
  convert.c                                     |   4 +-
  credential.c                                  |   1 +
  delta-islands.c                               |   4 +-
  diff.c                                        |  19 +-
  diff.h                                        |   7 +-
  fetch-pack.c                                  |   5 +-
  fmt-merge-msg.c                               |   7 +-
  fmt-merge-msg.h                               |   3 +-
  fsck.c                                        |  12 +-
  fsck.h                                        |   4 +-
  git-compat-util.h                             |   2 +
  gpg-interface.c                               |   7 +-
  grep.c                                        |   7 +-
  grep.h                                        |   4 +-
  help.c                                        |   9 +-
  http.c                                        |  15 +-
  ident.c                                       |   4 +-
  ident.h                                       |   4 +-
  imap-send.c                                   |   7 +-
  ll-merge.c                                    |   1 +
  ls-refs.c                                     |   1 +
  mailinfo.c                                    |   5 +-
  notes-utils.c                                 |   4 +-
  notes.c                                       |   4 +-
  pager.c                                       |   5 +-
  pretty.c                                      |   1 +
  promisor-remote.c                             |   4 +-
  remote.c                                      |   8 +-
  revision.c                                    |   4 +-
  scalar.c                                      |   4 +-
  sequencer.c                                   |  29 +-
  setup.c                                       |  18 +-
  submodule-config.c                            |  31 +-
  submodule-config.h                            |   3 +-
  t/helper/test-config.c                        |  24 +-
  t/helper/test-userdiff.c                      |   4 +-
  t/t1300-config.sh                             |  27 +
  trace2.c                                      |   4 +-
  trace2.h                                      |   3 +-
  trace2/tr2_cfg.c                              |  16 +-
  trace2/tr2_sysenv.c                           |   3 +-
  trace2/tr2_tgt.h                              |   4 +-
  trace2/tr2_tgt_event.c                        |   4 +-
  trace2/tr2_tgt_normal.c                       |   4 +-
  trace2/tr2_tgt_perf.c                         |   4 +-
  trailer.c                                     |   2 +
  upload-pack.c                                 |  18 +-
  urlmatch.c                                    |   7 +-
  urlmatch.h                                    |   8 +-
  worktree.c                                    |   2 +-
  xdiff-interface.c                             |   5 +-
  xdiff-interface.h                             |   4 +-
  103 files changed, 960 insertions(+), 638 deletions(-)
  create mode 100644 contrib/coccinelle/config_fn_ctx.pending.cocci
  create mode 100644 contrib/coccinelle/git_config_number.cocci


base-commit: 6ff334181cfb6485d3ba50843038209a2a253907
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1497%2Fchooglen%2Fconfig%2Fno-global-v5
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1497/chooglen/config/no-global-v5
Pull-Request: https://github.com/git/git/pull/1497

Range-diff vs v4:

   1:  7bfffb454c5 =  1:  7bfffb454c5 config: inline git_color_default_config
   2:  739c519ce62 =  2:  739c519ce62 urlmatch.h: use config_fn_t type
   3:  a9a0a50f32a =  3:  a9a0a50f32a config: add ctx arg to config_fn_t
   4:  39b2e291f86 =  4:  39b2e291f86 config.c: pass ctx in configsets
   5:  bfc6d2833c5 =  5:  bfc6d2833c5 config: pass ctx with config files
   6:  897bdc759b5 <  -:  ----------- builtin/config.c: test misuse of format_config()
   7:  33e4437737d !  6:  7b24eefbcf3 config.c: pass ctx with CLI config
      @@ Commit message
           * git_config_parse_parameter() hasn't been setting config source
             information, so plumb "kvi" there too.
- * "git config --get-urlmatch --show-scope" iterates config to collect
      -      values, but then attempts to display the scope after config iteration.
      -      Fix this by copying the "kvi" value in the collection phase so that it
      -      can be read back later. This means that we can now support "git config
      -      --get-urlmatch --show-origin" (we don't allow this combination of args
      -      because of this bug), but that is left unchanged for now.
      +    * Several sites in builtin/config.c have been calling current_config_*()
      +      functions outside of config callbacks (indirectly, via the
      +      format_config() helper), which means they're reading state that isn't
      +      set correctly:
- * "git config --default" doesn't have config source metadata when
      -      displaying the default value. Fix this by treating the default value
      -      as if it came from the command line (e.g. like we do with "git -c" or
      -      "git config --file"), using kvi_from_param().
      +      * "git config --get-urlmatch --show-scope" iterates config to collect
      +        values, but then attempts to display the scope after config
      +        iteration, causing the "unknown" scope to be shown instead of the
      +        config file's scope. It's clear that this wasn't intended: we knew
      +        that "--get-urlmatch" couldn't show config source metadata, which is
      +        why "--show-origin" was marked incompatible with "--get-urlmatch"
      +        when it was introduced [1]. It was most likely a mistake that we
      +        allowed "--show-scope" to sneak through.
      +
      +        Fix this by copying the "kvi" value in the collection phase so that
      +        it can be read back later. This means that we can now support "git
      +        config --get-urlmatch --show-origin", but that is left unchanged
      +        for now.
      +
      +      * "git config --default" doesn't have config source metadata when
      +        displaying the default value, so "--show-scope" also results in
      +        "unknown", and "--show-origin" results in a BUG(). Fix this by
      +        treating the default value as if it came from the command line (e.g.
      +        like we do with "git -c" or "git config --file"), using
      +        kvi_from_param().
      +
      +    [1] https://lore.kernel.org/git/20160205112001.GA13397@xxxxxxxxxxxxxxxxxxxxx/
Signed-off-by: Glen Choo <chooglen@xxxxxxxxxx> @@ config.c: static int configset_find_element(struct config_set *set, const char *
        			       const char *value)
        {
       @@ config.c: static int configset_add_value(struct config_reader *reader,
      - 	l_item->e = e;
      - 	l_item->value_index = e->value_list.nr - 1;
      -
      --	if (!reader->source)
      --		BUG("configset_add_value has no source");
      + 	if (!reader->source)
      + 		BUG("configset_add_value has no source");
        	if (reader->source->name) {
       -		kvi_from_source(reader->source, current_config_scope(), kv_info);
       +		kvi_from_source(reader->source, kvi_p->scope, kv_info);
      @@ config.h: void git_global_config(char **user, char **xdg);
         * Match and parse a config key of the form:
## t/t1300-config.sh ##
      -@@ t/t1300-config.sh: test_expect_success 'urlmatch with --show-scope' '
      - 	EOF
      +@@ t/t1300-config.sh: test_expect_success 'urlmatch' '
      + 	test_cmp expect actual
      + '
- cat >expect <<-EOF &&
      --	unknown	http.cookiefile /tmp/cookie.txt
      --	unknown	http.sslverify false
      ++test_expect_success 'urlmatch with --show-scope' '
      ++	cat >.git/config <<-\EOF &&
      ++	[http "https://weak.example.com";]
      ++		sslVerify = false
      ++		cookieFile = /tmp/cookie.txt
      ++	EOF
      ++
      ++	cat >expect <<-EOF &&
       +	local	http.cookiefile /tmp/cookie.txt
       +	local	http.sslverify false
      - 	EOF
      - 	git config --get-urlmatch --show-scope HTTP https://weak.example.com >actual &&
      - 	test_cmp expect actual
      ++	EOF
      ++	git config --get-urlmatch --show-scope HTTP https://weak.example.com >actual &&
      ++	test_cmp expect actual
      ++'
      ++
      + test_expect_success 'urlmatch favors more specific URLs' '
      + 	cat >.git/config <<-\EOF &&
      + 	[http "https://example.com/";]
       @@ t/t1300-config.sh: test_expect_success '--show-origin blob ref' '
      + 	test_cmp expect output
        '
- test_expect_success '--show-origin with --default' '
      --	test_must_fail git config --show-origin --default foo some.key
      ++test_expect_success '--show-origin with --default' '
       +	git config --show-origin --default foo some.key >actual &&
       +	echo "command line:	foo" >expect &&
       +	test_cmp expect actual
      - '
      -
      ++'
      ++
        test_expect_success '--show-scope with --list' '
      + 	cat >expect <<-EOF &&
      + 	global	user.global=true
       @@ t/t1300-config.sh: test_expect_success '--show-scope with --show-origin' '
      -
      - test_expect_success '--show-scope with --default' '
      - 	git config --show-scope --default foo some.key >actual &&
      --	echo "unknown	foo" >expect &&
      -+	echo "command	foo" >expect &&
      - 	test_cmp expect actual
      + 	test_cmp expect output
        '
++test_expect_success '--show-scope with --default' '
      ++	git config --show-scope --default foo some.key >actual &&
      ++	echo "command	foo" >expect &&
      ++	test_cmp expect actual
      ++'
      ++
      + test_expect_success 'override global and system config' '
      + 	test_when_finished rm -f \"\$HOME\"/.gitconfig &&
      + 	cat >"$HOME"/.gitconfig <<-EOF &&
   8:  9bd5f60282c =  7:  7d64dcbdade trace2: plumb config kvi
   9:  114723ee4a7 =  8:  9e71c10ca0a config: pass kvi to die_bad_number()
  10:  807057b6d7f !  9:  4776600e790 config.c: remove config_reader from configsets
      @@ config.c: static int configset_add_value(const struct key_value_info *kvi_p,
        	l_item->e = e;
        	l_item->value_index = e->value_list.nr - 1;
+- if (!reader->source)
      +-		BUG("configset_add_value has no source");
       -	if (reader->source->name) {
       -		kvi_from_source(reader->source, kvi_p->scope, kv_info);
       -	} else {
       -		kvi_from_param(kv_info);
       -	}
      -+	memcpy(kv_info, kvi_p, sizeof(struct key_value_info));
      ++	*kv_info = *kvi_p;
        	si->util = kv_info;
return 0;
  11:  3f0f84df972 = 10:  2b33977aba6 config: add kvi.path, use it to evaluate includes
  12:  fe2f154fe8b = 11:  8347d3c9b80 config: pass source to config_parser_event_fn_t




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