From 76e9bdc437ca3111883eb57a479e5d8f582dd670 Mon Sep 17 00:00:00 2001 From: Antonio Ospite Date: Thu, 25 Oct 2018 18:18:12 +0200 Subject: submodule: support reading .gitmodules when it's not in the working tree When the .gitmodules file is not available in the working tree, try using the content from the index and 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. Add a similar check also in git-submodule.sh::cmd_add() to anticipate the eventual failure of the "git submodule add" command when .gitmodules is not safely writeable; this prevents the command from leaving the repository in a spurious state (e.g. the submodule repository was cloned but .gitmodules was not updated because config_set_in_gitmodules_file_gently failed). Moreover, since config_from_gitmodules() now accesses the global object store, it is necessary to protect all code paths which call the function against concurrent access to the global object store. Currently this only happens in builtin/grep.c::grep_submodules(), so call grep_read_lock() before invoking code involving config_from_gitmodules(). Finally, add t7418-submodule-sparse-gitmodules.sh to verify that reading from .gitmodules succeeds and that writing to it fails when the file is not checked out. NOTE: there is one rare case where this new feature does not work properly yet: nested submodules without .gitmodules in their working tree. This has been documented with a warning and a test_expect_failure item in t7814, and in this case the current behavior is not altered: no config is read. Signed-off-by: Antonio Ospite Signed-off-by: Junio C Hamano --- builtin/grep.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) (limited to 'builtin/grep.c') diff --git a/builtin/grep.c b/builtin/grep.c index 601f801158f..7da8fef31aa 100644 --- a/builtin/grep.c +++ b/builtin/grep.c @@ -421,11 +421,23 @@ static int grep_submodule(struct grep_opt *opt, struct repository *superproject, struct repository submodule; int hit; - if (!is_submodule_active(superproject, path)) + /* + * NEEDSWORK: submodules functions need to be protected because they + * access the object store via config_from_gitmodules(): the latter + * uses get_oid() which, for now, relies on the global the_repository + * object. + */ + grep_read_lock(); + + if (!is_submodule_active(superproject, path)) { + grep_read_unlock(); return 0; + } - if (repo_submodule_init(&submodule, superproject, path)) + if (repo_submodule_init(&submodule, superproject, path)) { + grep_read_unlock(); return 0; + } repo_read_gitmodules(&submodule); @@ -439,7 +451,6 @@ static int grep_submodule(struct grep_opt *opt, struct repository *superproject, * store is no longer global and instead is a member of the repository * object. */ - grep_read_lock(); add_to_alternates_memory(submodule.objects->objectdir); grep_read_unlock(); -- cgit v1.2.3