[PATCH v2 2/5] remote: introduce remote.<name>.serverOption configuration

From: Xing Xin via GitGitGadget <gitgitgadget@gmail.com>
Date: Sep 23, 2024, 12:17 UTC
Message-ID: <2474b4c69d68576e901cdd6381aac9410cf21922.1727093878.git.gitgitgadget@gmail.com>
In-Reply-To: <pull.1776.v2.git.git.1727093878.gitgitgadget@gmail.com>

From: Xing Xin <xingxin.xx@bytedance.com>

Currently, server options for Git protocol v2 can only be specified via the command line option "--server-option" or "-o", which is inconvenient when users want to specify a list of default options to send. Therefore, we are introducing a new configuration to hold a list of default server options, akin to the `push.pushOption` configuration for push options.

Initially, I named the new configuration `fetch.serverOption` to align with `push.pushOption`. However, after discussing with Patrick, it was renamed to `remote.<name>.serverOption` as suggested, because:

1. Server options are designed to be server-specific, making it more
   logical to use a per-remote configuration.
2. Using "fetch." prefixed configurations in git-clone or git-ls-remote
   seems out of place and inconsistent in design.

The parsing logic for `remote.<name>.serverOption` also relies on `transport.c:parse_transport_option`, similar to `push.pushOption`, and they follow the same priority design:

1. Server options set in lower-priority configuration files (e.g.,
   /etc/gitconfig or $HOME/.gitconfig) can be overridden or unset in
   more specific repository configurations using an empty string.
2. Command-line specified server options take precedence over those from
   the configuration.

Server options from configuration are stored to the corresponding `remote.h:remote` as a new field `server_options`. The field will be utilized in the subsequent commit to help initialize the `server_options` of `transport.h:transport`.

And documentation have been updated accordingly.

Helped-by: Patrick Steinhardt <ps@pks.im>
Helped-by: Junio C Hamano <gitster@pobox.com>
Reported-by: Liu Zhongbo <liuzhongbo.6666@bytedance.com>
Signed-off-by: Xing Xin <xingxin.xx@bytedance.com>
---
 Documentation/config/remote.txt | 10 ++++++++++
 remote.c                        |  7 +++++++
 remote.h                        |  3 +++
 3 files changed, 20 insertions(+)

diff --git a/Documentation/config/remote.txt b/Documentation/config/remote.txt
index 8efc53e836d..8ba48573fb6 100644
--- a/Documentation/config/remote.txt
+++ b/Documentation/config/remote.txt
@@ -95,3 +95,13 @@ remote.<name>.partialclonefilter::
 	Changing or clearing this value will only affect fetches for new commits.
 	To fetch associated objects for commits already present in the local object
 	database, use the `--refetch` option of linkgit:git-fetch[1].
+
+remote.<name>.serverOption::
+	When no `--server-option=<option>` argument is given from the command
+	line, git will use the values from this configuration as a default list of
+	server options for this remote.
++
+This is a multi-valued variable, and an empty value can be used in a higher
+priority configuration file (e.g. `.git/config` in a repository) to clear
+the values inherited from a lower priority configuration files (e.g.
+`$HOME/.gitconfig`).
diff --git a/remote.c b/remote.c
index 7d5b8f750d8..fe11ead27ad 100644
--- a/remote.c
+++ b/remote.c
@@ -24,6 +24,7 @@
 #include "advice.h"
 #include "connect.h"
 #include "parse-options.h"
+#include "transport.h"
 
 enum map_direction { FROM_SRC, FROM_DST };
 
@@ -125,6 +126,7 @@ static struct remote *make_remote(struct remote_state *remote_state,
 	struct remote *ret;
 	struct remotes_hash_key lookup;
 	struct hashmap_entry lookup_entry, *e;
+	struct string_list server_options = STRING_LIST_INIT_DUP;
 
 	if (!len)
 		len = strlen(name);
@@ -143,6 +145,7 @@ static struct remote *make_remote(struct remote_state *remote_state,
 	ret->name = xstrndup(name, len);
 	refspec_init(&ret->push, REFSPEC_PUSH);
 	refspec_init(&ret->fetch, REFSPEC_FETCH);
+	ret->server_options = server_options;
 
 	ALLOC_GROW(remote_state->remotes, remote_state->remotes_nr + 1,
 		   remote_state->remotes_alloc);
@@ -166,6 +169,7 @@ static void remote_clear(struct remote *remote)
 	free((char *)remote->uploadpack);
 	FREE_AND_NULL(remote->http_proxy);
 	FREE_AND_NULL(remote->http_proxy_authmethod);
+	string_list_clear(&remote->server_options, 0);
 }
 
 static void add_merge(struct branch *branch, const char *name)
@@ -482,6 +486,9 @@ static int handle_config(const char *key, const char *value,
 					 key, value);
 	} else if (!strcmp(subkey, "vcs")) {
 		return git_config_string(&remote->foreign_vcs, key, value);
+	} else if (!strcmp(subkey, "serveroption")) {
+		return parse_transport_option(key, value,
+					      &remote->server_options);
 	}
 	return 0;
 }
diff --git a/remote.h b/remote.h
index b901b56746d..d9926a76d23 100644
--- a/remote.h
+++ b/remote.h
@@ -4,6 +4,7 @@
 #include "hash.h"
 #include "hashmap.h"
 #include "refspec.h"
+#include "string-list.h"
 #include "strvec.h"
 
 struct option;
@@ -104,6 +105,8 @@ struct remote {
 
 	/* The method used for authenticating against `http_proxy`. */
 	char *http_proxy_authmethod;
+
+	struct string_list server_options;
 };
 
 /**

-- 
gitgitgadget