Introduce core.sharedrepository

If the config variable 'core.sharedrepository' is set, the directories

	$GIT_DIR/objects/
	$GIT_DIR/objects/??
	$GIT_DIR/objects/pack
	$GIT_DIR/refs
	$GIT_DIR/refs/heads
	$GIT_DIR/refs/heads/tags

are set group writable (and g+s, since the git group may be not the primary
group of all users).

Since all files are written as lock files first, and then moved to
their destination, they do not have to be group writable.  Indeed, if
this leads to problems you found a bug.

Note that -- as in my first attempt -- the config variable is set in the
function which checks the repository format. If this were done in
git_default_config instead, a lot of programs would need to be modified
to call git_config(git_default_config) first.

[jc: git variables should be in environment.c unless there is a
 compelling reason to do otherwise.]

Signed-off-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/cache.h b/cache.h
index cb87becb3aaea75915a65e99565c418d6765174b..a99fb3ce7d3423d51f5a0829a4bd20f0cd5ca0e1 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -159,6 +159,7 @@ extern void rollback_index_file(struct cache_file *);
 extern int trust_executable_bit;
 extern int only_use_symrefs;
 extern int diff_rename_limit_default;
+extern int shared_repository;
 
 #define GIT_REPO_VERSION 0
 extern int repository_format_version;
@@ -183,6 +184,7 @@ extern const unsigned char null_sha1[20];
 
 int git_mkstemp(char *path, size_t n, const char *template);
 
+int adjust_shared_perm(const char *path);
 int safe_create_leading_directories(char *path);
 char *safe_strncpy(char *, const char *, size_t);
 char *enter_repo(char *path, int strict);

diff --git a/environment.c b/environment.c
index 0886ad38f94ddb897629d832160333921ac89481..0596fc647be37343371ae5a266906dab35707076 100644 (file)
--- a/environment.c
+++ b/environment.c
@@ -15,6 +15,7 @@ int trust_executable_bit = 1;
 int only_use_symrefs = 0;
 int repository_format_version = 0;
 char git_commit_encoding[MAX_ENCODING_LENGTH] = "utf-8";
+int shared_repository = 0;
 
 static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
        *git_graft_file;

diff --git a/setup.c b/setup.c
index d3556edf121ba78b0b83d20fdbd9cb397e79eb2b..36ede3d87483548bb1ce6c19361d7f6584386147 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -180,6 +180,8 @@ int check_repository_format_version(const char *var, const char *value)
 {
        if (strcmp(var, "core.repositoryformatversion") == 0)
                repository_format_version = git_config_int(var, value);
+       else if (strcmp(var, "core.sharedrepository") == 0)
+               shared_repository = git_config_bool(var, value);
        return 0;
 }
 

diff --git a/sha1_file.c b/sha1_file.c
index 6b7577dbc4ed845da1a70b6d727370423b086735..8bebbb255f762fc36f165b87023d8cc37732968a 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -48,6 +48,29 @@ int get_sha1_hex(const char *hex, unsigned char *sha1)
        return 0;
 }
 
+int adjust_shared_perm(const char *path)
+{
+       struct stat st;
+       int mode;
+
+       if (!shared_repository)
+               return 0;
+       if (lstat(path, &st) < 0)
+               return -1;
+       mode = st.st_mode;
+       if (mode & S_IRUSR)
+               mode |= S_IRGRP;
+       if (mode & S_IWUSR)
+               mode |= S_IWGRP;
+       if (mode & S_IXUSR)
+               mode |= S_IXGRP;
+       if (S_ISDIR(mode))
+               mode |= S_ISGID;
+       if (chmod(path, mode) < 0)
+               return -2;
+       return 0;
+}
+
 int safe_create_leading_directories(char *path)
 {
        char *pos = path;
@@ -59,11 +82,16 @@ int safe_create_leading_directories(char *path)
                if (!pos)
                        break;
                *pos = 0;
-               if (mkdir(path, 0777) < 0)
+               if (mkdir(path, 0777) < 0) {
                        if (errno != EEXIST) {
                                *pos = '/';
                                return -1;
                        }
+               }
+               else if (adjust_shared_perm(path)) {
+                       *pos = '/';
+                       return -2;
+               }
                *pos++ = '/';
        }
        return 0;
@@ -1255,6 +1283,8 @@ static int link_temp_to_file(const char *tmpfile, char *filename)
                if (dir) {
                        *dir = 0;
                        mkdir(filename, 0777);
+                       if (adjust_shared_perm(filename))
+                               return -2;
                        *dir = '/';
                        if (!link(tmpfile, filename))
                                return 0;