[PATCH] docs: fix repository-layout when building with breaking changes

["Phillip Wood via GitGitGadget" <gitgitgadget@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

Since commit 8ccc75c2452 (remote: announce removal of "branches/" and
"remotes/", 2025-01-22) enabling WITH_BREAKING_CHANGES when building git
removes support for reading branches from ".git/branches" and remotes
from ".git/remotes". However those locations are still documented in
gitrepository-layout.adoc even though the build does not support them.

Rectify this by adding a new document attribute
"without-breaking-changes" and use it to make the inclusion of those
sections of the documentation conditional. The name of the attribute is
based on the similar test prerequisite added in c5bc9a7f94a (Makefile:
wire up build option for deprecated features, 2025-01-22).

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
    docs: fix repository-layout when building with breaking changes
    
    I copied the name from the test prerequisite as I didn't want to have
    different names for condition used in the tests and documentation. I do
    have some reservations about the naming though as it means we end up
    having to use ifdef::!without-breaking-changes[] or test_expect_success
    !WITHOUT_BREAKING_CHANGES to document and test breaking changes which is
    a double negative.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1871%2Fphillipwood%2Fbreaking-changes-documentation-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1871/phillipwood/breaking-changes-documentation-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/1871

 Documentation/Makefile                  | 4 ++++
 Documentation/gitrepository-layout.adoc | 4 ++++
 Documentation/meson.build               | 4 ++++
 3 files changed, 12 insertions(+)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index a734c6d6243..53a05eb8030 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -221,6 +221,10 @@ asciidoc.conf: asciidoc.conf.in FORCE
 	$(QUIET_GEN)$(call version_gen,"$(shell pwd)/..",$<,$@)
 endif
 
+ifndef WITH_BREAKING_CHANGES
+ASCIIDOC_EXTRA += -awithout-breaking-changes
+endif
+
 ASCIIDOC_DEPS += docinfo.html
 
 SHELL_PATH ?= $(SHELL)
diff --git a/Documentation/gitrepository-layout.adoc b/Documentation/gitrepository-layout.adoc
index 6348ef1dcdf..62ef1c98c26 100644
--- a/Documentation/gitrepository-layout.adoc
+++ b/Documentation/gitrepository-layout.adoc
@@ -152,6 +152,7 @@ config.worktree::
 	working directory in multiple working directory setup (see
 	linkgit:git-worktree[1]).
 
+ifdef::without-breaking-changes[]
 branches::
 	A deprecated way to store shorthands to be used
 	to specify a URL to 'git fetch', 'git pull' and 'git push'.
@@ -164,6 +165,7 @@ branches::
 	"$GIT_COMMON_DIR/branches" will be used instead.
 +
 Git will stop reading remotes from this directory in Git 3.0.
+endif::without-breaking-changes[]
 
 hooks::
 	Hooks are customization scripts used by various Git
@@ -231,6 +233,7 @@ info/sparse-checkout::
 	This file stores sparse checkout patterns.
 	See also: linkgit:git-read-tree[1].
 
+ifdef::without-breaking-changes[]
 remotes::
 	Stores shorthands for URL and default refnames for use
 	when interacting with remote repositories via 'git fetch',
@@ -241,6 +244,7 @@ remotes::
 	"$GIT_COMMON_DIR/remotes" will be used instead.
 +
 Git will stop reading remotes from this directory in Git 3.0.
+endif::without-breaking-changes[]
 
 logs::
 	Records of changes made to refs are stored in this directory.
diff --git a/Documentation/meson.build b/Documentation/meson.build
index ead8e482131..4e4fca283c1 100644
--- a/Documentation/meson.build
+++ b/Documentation/meson.build
@@ -283,6 +283,10 @@ elif docs_backend == 'asciidoctor'
   ]
 endif
 
+if not get_option('breaking_changes')
+   asciidoc_common_options += ['--attribute', 'without-breaking-changes']
+endif
+
 git = find_program('git', required: false)
 xmlto = find_program('xmlto')
 

base-commit: 03944513488db4a81fdb4c21c3b515e4cb260b05
-- 
gitgitgadget