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From: Antonio Ospite <ao2@ao2.it>
To: git@vger.kernel.org
Cc: "Brandon Williams" <bmwill@google.com>,
	"Daniel Graña" <dangra@gmail.com>,
	"Jonathan Nieder" <jrnieder@gmail.com>,
	"Richard Hartmann" <richih.mailinglist@gmail.com>,
	"Stefan Beller" <sbeller@google.com>,
	"Antonio Ospite" <ao2@ao2.it>
Subject: [RFC PATCH v2 09/12] submodule: support reading .gitmodules even when it's not checked out
Date: Thu,  2 Aug 2018 15:46:31 +0200	[thread overview]
Message-ID: <20180802134634.10300-10-ao2@ao2.it> (raw)
In-Reply-To: <20180802134634.10300-1-ao2@ao2.it>

When the .gitmodules file is not available in the working tree, try
using HEAD:.gitmodules from the current branch. This covers the case
when the file is part of the repository but for some reason it is not
checked out, for example because of a sparse checkout.

This makes it possible to use at least the 'git submodule' commands
which *read* the gitmodules configuration file without fully populating
the working tree.

Writing to .gitmodules will still require that the file is checked out,
so check for that before calling config_set_in_gitmodules_file_gently.

Signed-off-by: Antonio Ospite <ao2@ao2.it>
---
 builtin/submodule--helper.c | 17 ++++++++++++++++-
 cache.h                     |  1 +
 submodule-config.c          | 16 ++++++++++++++--
 3 files changed, 31 insertions(+), 3 deletions(-)

diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index c388f4ee6f..616d5de0a9 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -2089,8 +2089,23 @@ static int module_config(int argc, const char **argv, const char *prefix)
 		return print_config_from_gitmodules(argv[1]);
 
 	/* Equivalent to ACTION_SET in builtin/config.c */
-	if (argc == 3)
+	if (argc == 3) {
+		struct object_id oid;
+
+		/*
+		 * If the .gitmodules file is not in the working tree but it
+		 * is in the current branch, stop, as writing new values and
+		 * staging them would blindly overwrite ALL the old content.
+		 *
+		 * This still makes it possible to create a brand new
+		 * .gitmodules when neither GITMODULES_FILE nor
+		 * GITMODULES_HEAD exist.
+		 */
+		if (!file_exists(GITMODULES_FILE) && get_oid(GITMODULES_HEAD, &oid) >= 0)
+			die(_("please make sure that the .gitmodules file in the current branch is checked out"));
+
 		return config_set_in_gitmodules_file_gently(argv[1], argv[2]);
+	}
 
 	return 0;
 }
diff --git a/cache.h b/cache.h
index 8b447652a7..8f75cafbb6 100644
--- a/cache.h
+++ b/cache.h
@@ -424,6 +424,7 @@ static inline enum object_type object_type(unsigned int mode)
 #define INFOATTRIBUTES_FILE "info/attributes"
 #define ATTRIBUTE_MACRO_PREFIX "[attr]"
 #define GITMODULES_FILE ".gitmodules"
+#define GITMODULES_HEAD "HEAD:.gitmodules"
 #define GIT_NOTES_REF_ENVIRONMENT "GIT_NOTES_REF"
 #define GIT_NOTES_DEFAULT_REF "refs/notes/commits"
 #define GIT_NOTES_DISPLAY_REF_ENVIRONMENT "GIT_NOTES_DISPLAY_REF"
diff --git a/submodule-config.c b/submodule-config.c
index 702d40dd6b..cf08264220 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -1,4 +1,5 @@
 #include "cache.h"
+#include "dir.h"
 #include "repository.h"
 #include "config.h"
 #include "submodule-config.h"
@@ -603,8 +604,19 @@ static void submodule_cache_check_init(struct repository *repo)
 static void config_from_gitmodules(config_fn_t fn, struct repository *repo, void *data)
 {
 	if (repo->worktree) {
-		char *file = repo_worktree_path(repo, GITMODULES_FILE);
-		git_config_from_file(fn, file, data);
+		struct git_config_source config_source = { 0 };
+		const struct config_options opts = { 0 };
+		struct object_id oid;
+		char *file;
+
+		file = repo_worktree_path(repo, GITMODULES_FILE);
+		if (file_exists(file))
+			config_source.file = file;
+		else if (get_oid(GITMODULES_HEAD, &oid) >= 0)
+			config_source.blob = GITMODULES_HEAD;
+
+		config_with_options(fn, data, &config_source, &opts);
+
 		free(file);
 	}
 }
-- 
2.18.0


  parent reply	other threads:[~2018-08-02 14:27 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-02 13:46 [RFC PATCH v2 00/12] Make submodules work if .gitmodules is not checked out Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 01/12] submodule: add a print_config_from_gitmodules() helper Antonio Ospite
2018-08-02 18:05   ` Stefan Beller
2018-08-09 10:17     ` Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 02/12] submodule: factor out a config_set_in_gitmodules_file_gently function Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 03/12] t7411: be nicer to future tests and really clean things up Antonio Ospite
2018-08-02 16:40   ` SZEDER Gábor
2018-08-02 18:15     ` Stefan Beller
2018-08-09 13:59       ` Antonio Ospite
2018-08-02 18:44     ` Junio C Hamano
2018-08-02 13:46 ` [RFC PATCH v2 04/12] submodule--helper: add a new 'config' subcommand Antonio Ospite
2018-08-02 18:47   ` Stefan Beller
2018-08-02 19:20     ` Jeff King
2018-08-03 10:21       ` Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 05/12] submodule: use the 'submodule--helper config' command Antonio Ospite
2018-08-02 18:59   ` Stefan Beller
2018-08-02 13:46 ` [RFC PATCH v2 06/12] submodule--helper: add a '--stage' option to the 'config' sub command Antonio Ospite
2018-08-02 18:57   ` Junio C Hamano
2018-08-03 11:03     ` Antonio Ospite
2018-08-03 16:24       ` Junio C Hamano
2018-08-06 10:58         ` Antonio Ospite
2018-08-06 17:38           ` Junio C Hamano
2018-08-07  9:19             ` Antonio Ospite
2018-08-06 18:19           ` Stefan Beller
2018-08-02 13:46 ` [RFC PATCH v2 07/12] submodule: use 'submodule--helper config --stage' to stage .gitmodules Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 08/12] t7506: cleanup .gitmodules properly before setting up new scenario Antonio Ospite
2018-08-02 19:11   ` Stefan Beller
2018-08-02 13:46 ` Antonio Ospite [this message]
2018-08-02 20:27   ` [RFC PATCH v2 09/12] submodule: support reading .gitmodules even when it's not checked out Stefan Beller
2018-08-02 13:46 ` [RFC PATCH v2 10/12] t7416: add new test about HEAD:.gitmodules and not existing .gitmodules Antonio Ospite
2018-08-02 20:43   ` Stefan Beller
2018-08-09  9:14     ` Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 11/12] dir: move is_empty_file() from builtin/am.c to dir.c and make it public Antonio Ospite
2018-08-02 20:50   ` Stefan Beller
2018-08-03  8:49     ` Antonio Ospite
2018-08-02 13:46 ` [RFC PATCH v2 12/12] submodule: remove the .gitmodules file when it is empty Antonio Ospite
2018-08-02 21:15   ` Stefan Beller
2018-08-03  8:57     ` Antonio Ospite

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