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authorNguyễn Thái Ngọc Duy <pclouds@gmail.com>2014-11-30 15:24:36 +0700
committerJunio C Hamano <gitster@pobox.com>2014-12-01 11:00:13 -0800
commitc7b3a3d2fe2688a30ddb8d516ed000eeda13c24e (patch)
tree4dc76c6219f2ee1aa27b73c095beef3ca0cd6675 /environment.c
parentaf07b20d515dce034d16062d9f6baa2e4b4bf7ae (diff)
downloadgit-c7b3a3d2fe2688a30ddb8d516ed000eeda13c24e.tar.gz
$GIT_COMMON_DIR: a new environment variable
This variable is intended to support multiple working directories attached to a repository. Such a repository may have a main working directory, created by either "git init" or "git clone" and one or more linked working directories. These working directories and the main repository share the same repository directory. In linked working directories, $GIT_COMMON_DIR must be defined to point to the real repository directory and $GIT_DIR points to an unused subdirectory inside $GIT_COMMON_DIR. File locations inside the repository are reorganized from the linked worktree view point: - worktree-specific such as HEAD, logs/HEAD, index, other top-level refs and unrecognized files are from $GIT_DIR. - the rest like objects, refs, info, hooks, packed-refs, shallow... are from $GIT_COMMON_DIR (except info/sparse-checkout, but that's a separate patch) Scripts are supposed to retrieve paths in $GIT_DIR with "git rev-parse --git-path", which will take care of "$GIT_DIR vs $GIT_COMMON_DIR" business. The redirection is done by git_path(), git_pathdup() and strbuf_git_path(). The selected list of paths goes to $GIT_COMMON_DIR, not the other way around in case a developer adds a new worktree-specific file and it's accidentally promoted to be shared across repositories (this includes unknown files added by third party commands) The list of known files that belong to $GIT_DIR are: ADD_EDIT.patch BISECT_ANCESTORS_OK BISECT_EXPECTED_REV BISECT_LOG BISECT_NAMES CHERRY_PICK_HEAD COMMIT_MSG FETCH_HEAD HEAD MERGE_HEAD MERGE_MODE MERGE_RR NOTES_EDITMSG NOTES_MERGE_WORKTREE ORIG_HEAD REVERT_HEAD SQUASH_MSG TAG_EDITMSG fast_import_crash_* logs/HEAD next-index-* rebase-apply rebase-merge rsync-refs-* sequencer/* shallow_* Path mapping is NOT done for git_path_submodule(). Multi-checkouts are not supported as submodules. Helped-by: Jens Lehmann <Jens.Lehmann@web.de> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'environment.c')
-rw-r--r--environment.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/environment.c b/environment.c
index fee12a605d..050f1607d5 100644
--- a/environment.c
+++ b/environment.c
@@ -81,9 +81,9 @@ static char *work_tree;
static const char *namespace;
static size_t namespace_len;
-static const char *git_dir;
+static const char *git_dir, *git_common_dir;
static char *git_object_dir, *git_index_file, *git_graft_file;
-int git_db_env, git_index_env, git_graft_env;
+int git_db_env, git_index_env, git_graft_env, git_common_dir_env;
/*
* Repository-local GIT_* environment variables; see cache.h for details.
@@ -101,6 +101,7 @@ const char * const local_repo_env[] = {
NO_REPLACE_OBJECTS_ENVIRONMENT,
GIT_PREFIX_ENVIRONMENT,
GIT_SHALLOW_FILE_ENVIRONMENT,
+ GIT_COMMON_DIR_ENVIRONMENT,
NULL
};
@@ -125,8 +126,8 @@ static char *expand_namespace(const char *raw_namespace)
return strbuf_detach(&buf, NULL);
}
-static char *git_path_from_env(const char *envvar, const char *path,
- int *fromenv)
+static char *git_path_from_env(const char *envvar, const char *git_dir,
+ const char *path, int *fromenv)
{
const char *value = getenv(envvar);
if (!value) {
@@ -149,9 +150,18 @@ static void setup_git_env(void)
git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
gitfile = read_gitfile(git_dir);
git_dir = xstrdup(gitfile ? gitfile : git_dir);
- git_object_dir = git_path_from_env(DB_ENVIRONMENT, "objects", &git_db_env);
- git_index_file = git_path_from_env(INDEX_ENVIRONMENT, "index", &git_index_env);
- git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, "info/grafts", &git_graft_env);
+ git_common_dir = getenv(GIT_COMMON_DIR_ENVIRONMENT);
+ if (git_common_dir) {
+ git_common_dir_env = 1;
+ git_common_dir = xstrdup(git_common_dir);
+ } else
+ git_common_dir = git_dir;
+ git_object_dir = git_path_from_env(DB_ENVIRONMENT, git_common_dir,
+ "objects", &git_db_env);
+ git_index_file = git_path_from_env(INDEX_ENVIRONMENT, git_dir,
+ "index", &git_index_env);
+ git_graft_file = git_path_from_env(GRAFT_ENVIRONMENT, git_common_dir,
+ "info/grafts", &git_graft_env);
if (getenv(NO_REPLACE_OBJECTS_ENVIRONMENT))
check_replace_refs = 0;
namespace = expand_namespace(getenv(GIT_NAMESPACE_ENVIRONMENT));
@@ -174,6 +184,11 @@ const char *get_git_dir(void)
return git_dir;
}
+const char *get_git_common_dir(void)
+{
+ return git_common_dir;
+}
+
const char *get_git_namespace(void)
{
if (!namespace)