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@xxxxxx>
---
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
