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git/submodule.c
Johannes Schindelin e8d0608944 submodule: require the submodule path to contain directories only 
Submodules are stored in subdirectories of their superproject. When
these subdirectories have been replaced with symlinks by a malicious
actor, all kinds of mayhem can be caused.

This _should_ not be possible, but many CVEs in the past showed that
_when_ possible, it allows attackers to slip in code that gets executed
during, say, a `git clone --recursive` operation.

Let's add some defense-in-depth to disallow submodule paths to have
anything except directories in them.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
2024-04-17 22:30:04 +02:00

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#include "cache.h"
#include "repository.h"
#include "config.h"
#include "submodule-config.h"
#include "submodule.h"
#include "dir.h"
#include "diff.h"
#include "commit.h"
#include "revision.h"
#include "run-command.h"
#include "diffcore.h"
#include "refs.h"
#include "string-list.h"
#include "oid-array.h"
#include "strvec.h"
#include "blob.h"
#include "thread-utils.h"
#include "quote.h"
#include "remote.h"
#include "worktree.h"
#include "parse-options.h"
#include "object-store.h"
#include "commit-reach.h"
#include "shallow.h"
static int config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
static int initialized_fetch_ref_tips;
static struct oid_array ref_tips_before_fetch;
static struct oid_array ref_tips_after_fetch;
/*
* Check if the .gitmodules file is unmerged. Parsing of the .gitmodules file
* will be disabled because we can't guess what might be configured in
* .gitmodules unless the user resolves the conflict.
*/
int is_gitmodules_unmerged(struct index_state *istate)
{
int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
if (pos < 0) { /* .gitmodules not found or isn't merged */
pos = -1 - pos;
if (istate->cache_nr > pos) { /* there is a .gitmodules */
const struct cache_entry *ce = istate->cache[pos];
if (ce_namelen(ce) == strlen(GITMODULES_FILE) &&
!strcmp(ce->name, GITMODULES_FILE))
return 1;
}
}
return 0;
}
/*
* Check if the .gitmodules file is safe to write.
*
* Writing to the .gitmodules file requires that the file exists in the
* working tree or, if it doesn't, that a brand new .gitmodules file is going
* to be created (i.e. it's neither in the index nor in the current branch).
*
* It is not safe to write to .gitmodules if it's not in the working tree but
* it is in the index or in the current branch, because writing new values
* (and staging them) would blindly overwrite ALL the old content.
*/
int is_writing_gitmodules_ok(void)
{
struct object_id oid;
return file_exists(GITMODULES_FILE) ||
(get_oid(GITMODULES_INDEX, &oid) < 0 && get_oid(GITMODULES_HEAD, &oid) < 0);
}
/*
* Check if the .gitmodules file has unstaged modifications. This must be
* checked before allowing modifications to the .gitmodules file with the
* intention to stage them later, because when continuing we would stage the
* modifications the user didn't stage herself too. That might change in a
* future version when we learn to stage the changes we do ourselves without
* staging any previous modifications.
*/
int is_staging_gitmodules_ok(struct index_state *istate)
{
int pos = index_name_pos(istate, GITMODULES_FILE, strlen(GITMODULES_FILE));
if ((pos >= 0) && (pos < istate->cache_nr)) {
struct stat st;
if (lstat(GITMODULES_FILE, &st) == 0 &&
ie_modified(istate, istate->cache[pos], &st, 0) & DATA_CHANGED)
return 0;
}
return 1;
}
static int for_each_remote_ref_submodule(const char *submodule,
each_ref_fn fn, void *cb_data)
{
return refs_for_each_remote_ref(get_submodule_ref_store(submodule),
fn, cb_data);
}
/*
* Try to update the "path" entry in the "submodule.<name>" section of the
* .gitmodules file. Return 0 only if a .gitmodules file was found, a section
* with the correct path=<oldpath> setting was found and we could update it.
*/
int update_path_in_gitmodules(const char *oldpath, const char *newpath)
{
struct strbuf entry = STRBUF_INIT;
const struct submodule *submodule;
int ret;
if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
return -1;
if (is_gitmodules_unmerged(the_repository->index))
die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
submodule = submodule_from_path(the_repository, null_oid(), oldpath);
if (!submodule || !submodule->name) {
warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
return -1;
}
strbuf_addstr(&entry, "submodule.");
strbuf_addstr(&entry, submodule->name);
strbuf_addstr(&entry, ".path");
ret = config_set_in_gitmodules_file_gently(entry.buf, newpath);
strbuf_release(&entry);
return ret;
}
/*
* Try to remove the "submodule.<name>" section from .gitmodules where the given
* path is configured. Return 0 only if a .gitmodules file was found, a section
* with the correct path=<path> setting was found and we could remove it.
*/
int remove_path_from_gitmodules(const char *path)
{
struct strbuf sect = STRBUF_INIT;
const struct submodule *submodule;
if (!file_exists(GITMODULES_FILE)) /* Do nothing without .gitmodules */
return -1;
if (is_gitmodules_unmerged(the_repository->index))
die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
submodule = submodule_from_path(the_repository, null_oid(), path);
if (!submodule || !submodule->name) {
warning(_("Could not find section in .gitmodules where path=%s"), path);
return -1;
}
strbuf_addstr(&sect, "submodule.");
strbuf_addstr(&sect, submodule->name);
if (git_config_rename_section_in_file(GITMODULES_FILE, sect.buf, NULL) < 0) {
/* Maybe the user already did that, don't error out here */
warning(_("Could not remove .gitmodules entry for %s"), path);
strbuf_release(&sect);
return -1;
}
strbuf_release(&sect);
return 0;
}
void stage_updated_gitmodules(struct index_state *istate)
{
if (add_file_to_index(istate, GITMODULES_FILE, 0))
die(_("staging updated .gitmodules failed"));
}
static struct string_list added_submodule_odb_paths = STRING_LIST_INIT_NODUP;
void add_submodule_odb_by_path(const char *path)
{
string_list_insert(&added_submodule_odb_paths, xstrdup(path));
}
int register_all_submodule_odb_as_alternates(void)
{
int i;
int ret = added_submodule_odb_paths.nr;
for (i = 0; i < added_submodule_odb_paths.nr; i++)
add_to_alternates_memory(added_submodule_odb_paths.items[i].string);
if (ret) {
string_list_clear(&added_submodule_odb_paths, 0);
trace2_data_intmax("submodule", the_repository,
"register_all_submodule_odb_as_alternates/registered", ret);
if (git_env_bool("GIT_TEST_FATAL_REGISTER_SUBMODULE_ODB", 0))
BUG("register_all_submodule_odb_as_alternates() called");
}
return ret;
}
void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
const char *path)
{
const struct submodule *submodule = submodule_from_path(the_repository,
null_oid(),
path);
if (submodule) {
const char *ignore;
char *key;
key = xstrfmt("submodule.%s.ignore", submodule->name);
if (repo_config_get_string_tmp(the_repository, key, &ignore))
ignore = submodule->ignore;
free(key);
if (ignore)
handle_ignore_submodules_arg(diffopt, ignore);
else if (is_gitmodules_unmerged(the_repository->index))
diffopt->flags.ignore_submodules = 1;
}
}
/* Cheap function that only determines if we're interested in submodules at all */
int git_default_submodule_config(const char *var, const char *value,
void *cb UNUSED)
{
if (!strcmp(var, "submodule.recurse")) {
int v = git_config_bool(var, value) ?
RECURSE_SUBMODULES_ON : RECURSE_SUBMODULES_OFF;
config_update_recurse_submodules = v;
}
return 0;
}
int option_parse_recurse_submodules_worktree_updater(const struct option *opt,
const char *arg, int unset)
{
if (unset) {
config_update_recurse_submodules = RECURSE_SUBMODULES_OFF;
return 0;
}
if (arg)
config_update_recurse_submodules =
parse_update_recurse_submodules_arg(opt->long_name,
arg);
else
config_update_recurse_submodules = RECURSE_SUBMODULES_ON;
return 0;
}
/*
* Determine if a submodule has been initialized at a given 'path'
*/
/*
* NEEDSWORK: Emit a warning if submodule.active exists, but is valueless,
* ie, the config looks like: "[submodule] active\n".
* Since that is an invalid pathspec, we should inform the user.
*/
int is_tree_submodule_active(struct repository *repo,
const struct object_id *treeish_name,
const char *path)
{
int ret = 0;
char *key = NULL;
char *value = NULL;
const struct string_list *sl;
const struct submodule *module;
module = submodule_from_path(repo, treeish_name, path);
/* early return if there isn't a path->module mapping */
if (!module)
return 0;
/* submodule.<name>.active is set */
key = xstrfmt("submodule.%s.active", module->name);
if (!repo_config_get_bool(repo, key, &ret)) {
free(key);
return ret;
}
free(key);
/* submodule.active is set */
sl = repo_config_get_value_multi(repo, "submodule.active");
if (sl) {
struct pathspec ps;
struct strvec args = STRVEC_INIT;
const struct string_list_item *item;
for_each_string_list_item(item, sl) {
strvec_push(&args, item->string);
}
parse_pathspec(&ps, 0, 0, NULL, args.v);
ret = match_pathspec(repo->index, &ps, path, strlen(path), 0, NULL, 1);
strvec_clear(&args);
clear_pathspec(&ps);
return ret;
}
/* fallback to checking if the URL is set */
key = xstrfmt("submodule.%s.url", module->name);
ret = !repo_config_get_string(repo, key, &value);
free(value);
free(key);
return ret;
}
int is_submodule_active(struct repository *repo, const char *path)
{
return is_tree_submodule_active(repo, null_oid(), path);
}
int is_submodule_populated_gently(const char *path, int *return_error_code)
{
int ret = 0;
char *gitdir = xstrfmt("%s/.git", path);
if (resolve_gitdir_gently(gitdir, return_error_code))
ret = 1;
free(gitdir);
return ret;
}
/*
* Dies if the provided 'prefix' corresponds to an unpopulated submodule
*/
void die_in_unpopulated_submodule(struct index_state *istate,
const char *prefix)
{
int i, prefixlen;
if (!prefix)
return;
prefixlen = strlen(prefix);
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
int ce_len = ce_namelen(ce);
if (!S_ISGITLINK(ce->ce_mode))
continue;
if (prefixlen <= ce_len)
continue;
if (strncmp(ce->name, prefix, ce_len))
continue;
if (prefix[ce_len] != '/')
continue;
die(_("in unpopulated submodule '%s'"), ce->name);
}
}
/*
* Dies if any paths in the provided pathspec descends into a submodule
*/
void die_path_inside_submodule(struct index_state *istate,
const struct pathspec *ps)
{
int i, j;
for (i = 0; i < istate->cache_nr; i++) {
struct cache_entry *ce = istate->cache[i];
int ce_len = ce_namelen(ce);
if (!S_ISGITLINK(ce->ce_mode))
continue;
for (j = 0; j < ps->nr ; j++) {
const struct pathspec_item *item = &ps->items[j];
if (item->len <= ce_len)
continue;
if (item->match[ce_len] != '/')
continue;
if (strncmp(ce->name, item->match, ce_len))
continue;
if (item->len == ce_len + 1)
continue;
die(_("Pathspec '%s' is in submodule '%.*s'"),
item->original, ce_len, ce->name);
}
}
}
enum submodule_update_type parse_submodule_update_type(const char *value)
{
if (!strcmp(value, "none"))
return SM_UPDATE_NONE;
else if (!strcmp(value, "checkout"))
return SM_UPDATE_CHECKOUT;
else if (!strcmp(value, "rebase"))
return SM_UPDATE_REBASE;
else if (!strcmp(value, "merge"))
return SM_UPDATE_MERGE;
else if (*value == '!')
return SM_UPDATE_COMMAND;
else
return SM_UPDATE_UNSPECIFIED;
}
int parse_submodule_update_strategy(const char *value,
struct submodule_update_strategy *dst)
{
enum submodule_update_type type;
free((void*)dst->command);
dst->command = NULL;
type = parse_submodule_update_type(value);
if (type == SM_UPDATE_UNSPECIFIED)
return -1;
dst->type = type;
if (type == SM_UPDATE_COMMAND)
dst->command = xstrdup(value + 1);
return 0;
}
const char *submodule_update_type_to_string(enum submodule_update_type type)
{
switch (type) {
case SM_UPDATE_CHECKOUT:
return "checkout";
case SM_UPDATE_MERGE:
return "merge";
case SM_UPDATE_REBASE:
return "rebase";
case SM_UPDATE_NONE:
return "none";
case SM_UPDATE_UNSPECIFIED:
case SM_UPDATE_COMMAND:
BUG("init_submodule() should handle type %d", type);
default:
BUG("unexpected update strategy type: %d", type);
}
}
void handle_ignore_submodules_arg(struct diff_options *diffopt,
const char *arg)
{
diffopt->flags.ignore_submodule_set = 1;
diffopt->flags.ignore_submodules = 0;
diffopt->flags.ignore_untracked_in_submodules = 0;
diffopt->flags.ignore_dirty_submodules = 0;
if (!strcmp(arg, "all"))
diffopt->flags.ignore_submodules = 1;
else if (!strcmp(arg, "untracked"))
diffopt->flags.ignore_untracked_in_submodules = 1;
else if (!strcmp(arg, "dirty"))
diffopt->flags.ignore_dirty_submodules = 1;
else if (strcmp(arg, "none"))
die(_("bad --ignore-submodules argument: %s"), arg);
/*
* Please update _git_status() in git-completion.bash when you
* add new options
*/
}
static int prepare_submodule_diff_summary(struct repository *r, struct rev_info *rev,
const char *path,
struct commit *left, struct commit *right,
struct commit_list *merge_bases)
{
struct commit_list *list;
repo_init_revisions(r, rev, NULL);
setup_revisions(0, NULL, rev, NULL);
rev->left_right = 1;
rev->first_parent_only = 1;
left->object.flags |= SYMMETRIC_LEFT;
add_pending_object(rev, &left->object, path);
add_pending_object(rev, &right->object, path);
for (list = merge_bases; list; list = list->next) {
list->item->object.flags |= UNINTERESTING;
add_pending_object(rev, &list->item->object,
oid_to_hex(&list->item->object.oid));
}
return prepare_revision_walk(rev);
}
static void print_submodule_diff_summary(struct repository *r, struct rev_info *rev, struct diff_options *o)
{
static const char format[] = " %m %s";
struct strbuf sb = STRBUF_INIT;
struct commit *commit;
while ((commit = get_revision(rev))) {
struct pretty_print_context ctx = {0};
ctx.date_mode = rev->date_mode;
ctx.output_encoding = get_log_output_encoding();
strbuf_setlen(&sb, 0);
repo_format_commit_message(r, commit, format, &sb,
&ctx);
strbuf_addch(&sb, '\n');
if (commit->object.flags & SYMMETRIC_LEFT)
diff_emit_submodule_del(o, sb.buf);
else
diff_emit_submodule_add(o, sb.buf);
}
strbuf_release(&sb);
}
void prepare_submodule_repo_env(struct strvec *out)
{
prepare_other_repo_env(out, DEFAULT_GIT_DIR_ENVIRONMENT);
}
static void prepare_submodule_repo_env_in_gitdir(struct strvec *out)
{
prepare_other_repo_env(out, ".");
}
/*
* Initialize a repository struct for a submodule based on the provided 'path'.
*
* Returns the repository struct on success,
* NULL when the submodule is not present.
*/
static struct repository *open_submodule(const char *path)
{
struct strbuf sb = STRBUF_INIT;
struct repository *out = xmalloc(sizeof(*out));
if (submodule_to_gitdir(&sb, path) || repo_init(out, sb.buf, NULL)) {
strbuf_release(&sb);
free(out);
return NULL;
}
/* Mark it as a submodule */
out->submodule_prefix = xstrdup(path);
strbuf_release(&sb);
return out;
}
/*
* Helper function to display the submodule header line prior to the full
* summary output.
*
* If it can locate the submodule git directory it will create a repository
* handle for the submodule and lookup both the left and right commits and
* put them into the left and right pointers.
*/
static void show_submodule_header(struct diff_options *o,
const char *path,
struct object_id *one, struct object_id *two,
unsigned dirty_submodule,
struct repository *sub,
struct commit **left, struct commit **right,
struct commit_list **merge_bases)
{
const char *message = NULL;
struct strbuf sb = STRBUF_INIT;
int fast_forward = 0, fast_backward = 0;
if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
diff_emit_submodule_untracked(o, path);
if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
diff_emit_submodule_modified(o, path);
if (is_null_oid(one))
message = "(new submodule)";
else if (is_null_oid(two))
message = "(submodule deleted)";
if (!sub) {
if (!message)
message = "(commits not present)";
goto output_header;
}
/*
* Attempt to lookup the commit references, and determine if this is
* a fast forward or fast backwards update.
*/
*left = lookup_commit_reference(sub, one);
*right = lookup_commit_reference(sub, two);
/*
* Warn about missing commits in the submodule project, but only if
* they aren't null.
*/
if ((!is_null_oid(one) && !*left) ||
(!is_null_oid(two) && !*right))
message = "(commits not present)";
*merge_bases = repo_get_merge_bases(sub, *left, *right);
if (*merge_bases) {
if ((*merge_bases)->item == *left)
fast_forward = 1;
else if ((*merge_bases)->item == *right)
fast_backward = 1;
}
if (oideq(one, two)) {
strbuf_release(&sb);
return;
}
output_header:
strbuf_addf(&sb, "Submodule %s ", path);
strbuf_add_unique_abbrev(&sb, one, DEFAULT_ABBREV);
strbuf_addstr(&sb, (fast_backward || fast_forward) ? ".." : "...");
strbuf_add_unique_abbrev(&sb, two, DEFAULT_ABBREV);
if (message)
strbuf_addf(&sb, " %s\n", message);
else
strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
diff_emit_submodule_header(o, sb.buf);
strbuf_release(&sb);
}
void show_submodule_diff_summary(struct diff_options *o, const char *path,
struct object_id *one, struct object_id *two,
unsigned dirty_submodule)
{
struct rev_info rev = REV_INFO_INIT;
struct commit *left = NULL, *right = NULL;
struct commit_list *merge_bases = NULL;
struct repository *sub;
sub = open_submodule(path);
show_submodule_header(o, path, one, two, dirty_submodule,
sub, &left, &right, &merge_bases);
/*
* If we don't have both a left and a right pointer, there is no
* reason to try and display a summary. The header line should contain
* all the information the user needs.
*/
if (!left || !right || !sub)
goto out;
/* Treat revision walker failure the same as missing commits */
if (prepare_submodule_diff_summary(sub, &rev, path, left, right, merge_bases)) {
diff_emit_submodule_error(o, "(revision walker failed)\n");
goto out;
}
print_submodule_diff_summary(sub, &rev, o);
out:
free_commit_list(merge_bases);
release_revisions(&rev);
clear_commit_marks(left, ~0);
clear_commit_marks(right, ~0);
if (sub) {
repo_clear(sub);
free(sub);
}
}
void show_submodule_inline_diff(struct diff_options *o, const char *path,
struct object_id *one, struct object_id *two,
unsigned dirty_submodule)
{
const struct object_id *old_oid = the_hash_algo->empty_tree, *new_oid = the_hash_algo->empty_tree;
struct commit *left = NULL, *right = NULL;
struct commit_list *merge_bases = NULL;
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf sb = STRBUF_INIT;
struct repository *sub;
sub = open_submodule(path);
show_submodule_header(o, path, one, two, dirty_submodule,
sub, &left, &right, &merge_bases);
/* We need a valid left and right commit to display a difference */
if (!(left || is_null_oid(one)) ||
!(right || is_null_oid(two)))
goto done;
if (left)
old_oid = one;
if (right)
new_oid = two;
cp.git_cmd = 1;
cp.dir = path;
cp.out = -1;
cp.no_stdin = 1;
/* TODO: other options may need to be passed here. */
strvec_pushl(&cp.args, "diff", "--submodule=diff", NULL);
strvec_pushf(&cp.args, "--color=%s", want_color(o->use_color) ?
"always" : "never");
if (o->flags.reverse_diff) {
strvec_pushf(&cp.args, "--src-prefix=%s%s/",
o->b_prefix, path);
strvec_pushf(&cp.args, "--dst-prefix=%s%s/",
o->a_prefix, path);
} else {
strvec_pushf(&cp.args, "--src-prefix=%s%s/",
o->a_prefix, path);
strvec_pushf(&cp.args, "--dst-prefix=%s%s/",
o->b_prefix, path);
}
strvec_push(&cp.args, oid_to_hex(old_oid));
/*
* If the submodule has modified content, we will diff against the
* work tree, under the assumption that the user has asked for the
* diff format and wishes to actually see all differences even if they
* haven't yet been committed to the submodule yet.
*/
if (!(dirty_submodule & DIRTY_SUBMODULE_MODIFIED))
strvec_push(&cp.args, oid_to_hex(new_oid));
prepare_submodule_repo_env(&cp.env);
if (!is_directory(path)) {
/* fall back to absorbed git dir, if any */
if (!sub)
goto done;
cp.dir = sub->gitdir;
strvec_push(&cp.env, GIT_DIR_ENVIRONMENT "=.");
strvec_push(&cp.env, GIT_WORK_TREE_ENVIRONMENT "=.");
}
if (start_command(&cp)) {
diff_emit_submodule_error(o, "(diff failed)\n");
goto done;
}
while (strbuf_getwholeline_fd(&sb, cp.out, '\n') != EOF)
diff_emit_submodule_pipethrough(o, sb.buf, sb.len);
if (finish_command(&cp))
diff_emit_submodule_error(o, "(diff failed)\n");
done:
strbuf_release(&sb);
free_commit_list(merge_bases);
if (left)
clear_commit_marks(left, ~0);
if (right)
clear_commit_marks(right, ~0);
if (sub) {
repo_clear(sub);
free(sub);
}
}
int should_update_submodules(void)
{
return config_update_recurse_submodules == RECURSE_SUBMODULES_ON;
}
const struct submodule *submodule_from_ce(const struct cache_entry *ce)
{
if (!S_ISGITLINK(ce->ce_mode))
return NULL;
if (!should_update_submodules())
return NULL;
return submodule_from_path(the_repository, null_oid(), ce->name);
}
struct collect_changed_submodules_cb_data {
struct repository *repo;
struct string_list *changed;
const struct object_id *commit_oid;
};
/*
* this would normally be two functions: default_name_from_path() and
* path_from_default_name(). Since the default name is the same as
* the submodule path we can get away with just one function which only
* checks whether there is a submodule in the working directory at that
* location.
*/
static const char *default_name_or_path(const char *path_or_name)
{
int error_code;
if (!is_submodule_populated_gently(path_or_name, &error_code))
return NULL;
return path_or_name;
}
/*
* Holds relevant information for a changed submodule. Used as the .util
* member of the changed submodule name string_list_item.
*
* (super_oid, path) allows the submodule config to be read from _some_
* .gitmodules file. We store this information the first time we find a
* superproject commit that points to the submodule, but this is
* arbitrary - we can choose any (super_oid, path) that matches the
* submodule's name.
*
* NEEDSWORK: Storing an arbitrary commit is undesirable because we can't
* guarantee that we're reading the commit that the user would expect. A better
* scheme would be to just fetch a submodule by its name. This requires two
* steps:
* - Create a function that behaves like repo_submodule_init(), but accepts a
* submodule name instead of treeish_name and path. This should be easy
* because repo_submodule_init() internally uses the submodule's name.
*
* - Replace most instances of 'struct submodule' (which is the .gitmodules
* config) with just the submodule name. This is OK because we expect
* submodule settings to be stored in .git/config (via "git submodule init"),
* not .gitmodules. This also lets us delete get_non_gitmodules_submodule(),
* which constructs a bogus 'struct submodule' for the sake of giving a
* placeholder name to a gitlink.
*/
struct changed_submodule_data {
/*
* The first superproject commit in the rev walk that points to
* the submodule.
*/
const struct object_id *super_oid;
/*
* Path to the submodule in the superproject commit referenced
* by 'super_oid'.
*/
char *path;
/* The submodule commits that have changed in the rev walk. */
struct oid_array new_commits;
};
static void changed_submodule_data_clear(struct changed_submodule_data *cs_data)
{
oid_array_clear(&cs_data->new_commits);
free(cs_data->path);
}
static void collect_changed_submodules_cb(struct diff_queue_struct *q,
struct diff_options *options UNUSED,
void *data)
{
struct collect_changed_submodules_cb_data *me = data;
struct string_list *changed = me->changed;
const struct object_id *commit_oid = me->commit_oid;
int i;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
const struct submodule *submodule;
const char *name;
struct string_list_item *item;
struct changed_submodule_data *cs_data;
if (!S_ISGITLINK(p->two->mode))
continue;
submodule = submodule_from_path(me->repo,
commit_oid, p->two->path);
if (submodule)
name = submodule->name;
else {
name = default_name_or_path(p->two->path);
/* make sure name does not collide with existing one */
if (name)
submodule = submodule_from_name(me->repo,
commit_oid, name);
if (submodule) {
warning(_("Submodule in commit %s at path: "
"'%s' collides with a submodule named "
"the same. Skipping it."),
oid_to_hex(commit_oid), p->two->path);
name = NULL;
}
}
if (!name)
continue;
item = string_list_insert(changed, name);
if (item->util)
cs_data = item->util;
else {
item->util = xcalloc(1, sizeof(struct changed_submodule_data));
cs_data = item->util;
cs_data->super_oid = commit_oid;
cs_data->path = xstrdup(p->two->path);
}
oid_array_append(&cs_data->new_commits, &p->two->oid);
}
}
/*
* Collect the paths of submodules in 'changed' which have changed based on
* the revisions as specified in 'argv'. Each entry in 'changed' will also
* have a corresponding 'struct oid_array' (in the 'util' field) which lists
* what the submodule pointers were updated to during the change.
*/
static void collect_changed_submodules(struct repository *r,
struct string_list *changed,
struct strvec *argv)
{
struct rev_info rev;
const struct commit *commit;
int save_warning;
struct setup_revision_opt s_r_opt = {
.assume_dashdash = 1,
};
save_warning = warn_on_object_refname_ambiguity;
warn_on_object_refname_ambiguity = 0;
repo_init_revisions(r, &rev, NULL);
setup_revisions(argv->nr, argv->v, &rev, &s_r_opt);
warn_on_object_refname_ambiguity = save_warning;
if (prepare_revision_walk(&rev))
die(_("revision walk setup failed"));
while ((commit = get_revision(&rev))) {
struct rev_info diff_rev;
struct collect_changed_submodules_cb_data data;
data.repo = r;
data.changed = changed;
data.commit_oid = &commit->object.oid;
repo_init_revisions(r, &diff_rev, NULL);
diff_rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
diff_rev.diffopt.format_callback = collect_changed_submodules_cb;
diff_rev.diffopt.format_callback_data = &data;
diff_rev.dense_combined_merges = 1;
diff_tree_combined_merge(commit, &diff_rev);
release_revisions(&diff_rev);
}
reset_revision_walk();
release_revisions(&rev);
}
static void free_submodules_data(struct string_list *submodules)
{
struct string_list_item *item;
for_each_string_list_item(item, submodules)
changed_submodule_data_clear(item->util);
string_list_clear(submodules, 1);
}
static int has_remote(const char *refname UNUSED,
const struct object_id *oid UNUSED,
int flags UNUSED, void *cb_data UNUSED)
{
return 1;
}
static int append_oid_to_argv(const struct object_id *oid, void *data)
{
struct strvec *argv = data;
strvec_push(argv, oid_to_hex(oid));
return 0;
}
struct has_commit_data {
struct repository *repo;
int result;
const char *path;
const struct object_id *super_oid;
};
static int check_has_commit(const struct object_id *oid, void *data)
{
struct has_commit_data *cb = data;
struct repository subrepo;
enum object_type type;
if (repo_submodule_init(&subrepo, cb->repo, cb->path, cb->super_oid)) {
cb->result = 0;
/* subrepo failed to init, so don't clean it up. */
return 0;
}
type = oid_object_info(&subrepo, oid, NULL);
switch (type) {
case OBJ_COMMIT:
goto cleanup;
case OBJ_BAD:
/*
* Object is missing or invalid. If invalid, an error message
* has already been printed.
*/
cb->result = 0;
goto cleanup;
default:
die(_("submodule entry '%s' (%s) is a %s, not a commit"),
cb->path, oid_to_hex(oid), type_name(type));
}
cleanup:
repo_clear(&subrepo);
return 0;
}
static int submodule_has_commits(struct repository *r,
const char *path,
const struct object_id *super_oid,
struct oid_array *commits)
{
struct has_commit_data has_commit = {
.repo = r,
.result = 1,
.path = path,
.super_oid = super_oid
};
if (validate_submodule_path(path) < 0)
exit(128);
oid_array_for_each_unique(commits, check_has_commit, &has_commit);
if (has_commit.result) {
/*
* Even if the submodule is checked out and the commit is
* present, make sure it exists in the submodule's object store
* and that it is reachable from a ref.
*/
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf out = STRBUF_INIT;
strvec_pushl(&cp.args, "rev-list", "-n", "1", NULL);
oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
strvec_pushl(&cp.args, "--not", "--all", NULL);
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;
if (capture_command(&cp, &out, GIT_MAX_HEXSZ + 1) || out.len)
has_commit.result = 0;
strbuf_release(&out);
}
return has_commit.result;
}
static int submodule_needs_pushing(struct repository *r,
const char *path,
struct oid_array *commits)
{
if (!submodule_has_commits(r, path, null_oid(), commits))
/*
* NOTE: We do consider it safe to return "no" here. The
* correct answer would be "We do not know" instead of
* "No push needed", but it is quite hard to change
* the submodule pointer without having the submodule
* around. If a user did however change the submodules
* without having the submodule around, this indicates
* an expert who knows what they are doing or a
* maintainer integrating work from other people. In
* both cases it should be safe to skip this check.
*/
return 0;
if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf buf = STRBUF_INIT;
int needs_pushing = 0;
strvec_push(&cp.args, "rev-list");
oid_array_for_each_unique(commits, append_oid_to_argv, &cp.args);
strvec_pushl(&cp.args, "--not", "--remotes", "-n", "1" , NULL);
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.out = -1;
cp.dir = path;
if (start_command(&cp))
die(_("Could not run 'git rev-list <commits> --not --remotes -n 1' command in submodule %s"),
path);
if (strbuf_read(&buf, cp.out, the_hash_algo->hexsz + 1))
needs_pushing = 1;
finish_command(&cp);
close(cp.out);
strbuf_release(&buf);
return needs_pushing;
}
return 0;
}
int find_unpushed_submodules(struct repository *r,
struct oid_array *commits,
const char *remotes_name,
struct string_list *needs_pushing)
{
struct string_list submodules = STRING_LIST_INIT_DUP;
struct string_list_item *name;
struct strvec argv = STRVEC_INIT;
/* argv.v[0] will be ignored by setup_revisions */
strvec_push(&argv, "find_unpushed_submodules");
oid_array_for_each_unique(commits, append_oid_to_argv, &argv);
strvec_push(&argv, "--not");
strvec_pushf(&argv, "--remotes=%s", remotes_name);
collect_changed_submodules(r, &submodules, &argv);
for_each_string_list_item(name, &submodules) {
struct changed_submodule_data *cs_data = name->util;
const struct submodule *submodule;
const char *path = NULL;
submodule = submodule_from_name(r, null_oid(), name->string);
if (submodule)
path = submodule->path;
else
path = default_name_or_path(name->string);
if (!path)
continue;
if (submodule_needs_pushing(r, path, &cs_data->new_commits))
string_list_insert(needs_pushing, path);
}
free_submodules_data(&submodules);
strvec_clear(&argv);
return needs_pushing->nr;
}
static int push_submodule(const char *path,
const struct remote *remote,
const struct refspec *rs,
const struct string_list *push_options,
int dry_run)
{
if (validate_submodule_path(path) < 0)
exit(128);
if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
struct child_process cp = CHILD_PROCESS_INIT;
strvec_push(&cp.args, "push");
/*
* When recursing into a submodule, treat any "only" configurations as "on-
* demand", since "only" would not work (we need all submodules to be pushed
* in order to be able to push the superproject).
*/
strvec_push(&cp.args, "--recurse-submodules=only-is-on-demand");
if (dry_run)
strvec_push(&cp.args, "--dry-run");
if (push_options && push_options->nr) {
const struct string_list_item *item;
for_each_string_list_item(item, push_options)
strvec_pushf(&cp.args, "--push-option=%s",
item->string);
}
if (remote->origin != REMOTE_UNCONFIGURED) {
int i;
strvec_push(&cp.args, remote->name);
for (i = 0; i < rs->raw_nr; i++)
strvec_push(&cp.args, rs->raw[i]);
}
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;
if (run_command(&cp))
return 0;
close(cp.out);
}
return 1;
}
/*
* Perform a check in the submodule to see if the remote and refspec work.
* Die if the submodule can't be pushed.
*/
static void submodule_push_check(const char *path, const char *head,
const struct remote *remote,
const struct refspec *rs)
{
struct child_process cp = CHILD_PROCESS_INIT;
int i;
if (validate_submodule_path(path) < 0)
exit(128);
strvec_push(&cp.args, "submodule--helper");
strvec_push(&cp.args, "push-check");
strvec_push(&cp.args, head);
strvec_push(&cp.args, remote->name);
for (i = 0; i < rs->raw_nr; i++)
strvec_push(&cp.args, rs->raw[i]);
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.no_stdout = 1;
cp.dir = path;
/*
* Simply indicate if 'submodule--helper push-check' failed.
* More detailed error information will be provided by the
* child process.
*/
if (run_command(&cp))
die(_("process for submodule '%s' failed"), path);
}
int push_unpushed_submodules(struct repository *r,
struct oid_array *commits,
const struct remote *remote,
const struct refspec *rs,
const struct string_list *push_options,
int dry_run)
{
int i, ret = 1;
struct string_list needs_pushing = STRING_LIST_INIT_DUP;
if (!find_unpushed_submodules(r, commits,
remote->name, &needs_pushing))
return 1;
/*
* Verify that the remote and refspec can be propagated to all
* submodules. This check can be skipped if the remote and refspec
* won't be propagated due to the remote being unconfigured (e.g. a URL
* instead of a remote name).
*/
if (remote->origin != REMOTE_UNCONFIGURED) {
char *head;
struct object_id head_oid;
head = resolve_refdup("HEAD", 0, &head_oid, NULL);
if (!head)
die(_("Failed to resolve HEAD as a valid ref."));
for (i = 0; i < needs_pushing.nr; i++)
submodule_push_check(needs_pushing.items[i].string,
head, remote, rs);
free(head);
}
/* Actually push the submodules */
for (i = 0; i < needs_pushing.nr; i++) {
const char *path = needs_pushing.items[i].string;
fprintf(stderr, _("Pushing submodule '%s'\n"), path);
if (!push_submodule(path, remote, rs,
push_options, dry_run)) {
fprintf(stderr, _("Unable to push submodule '%s'\n"), path);
ret = 0;
}
}
string_list_clear(&needs_pushing, 0);
return ret;
}
static int append_oid_to_array(const char *ref UNUSED,
const struct object_id *oid,
int flags UNUSED, void *data)
{
struct oid_array *array = data;
oid_array_append(array, oid);
return 0;
}
void check_for_new_submodule_commits(struct object_id *oid)
{
if (!initialized_fetch_ref_tips) {
for_each_ref(append_oid_to_array, &ref_tips_before_fetch);
initialized_fetch_ref_tips = 1;
}
oid_array_append(&ref_tips_after_fetch, oid);
}
/*
* Returns 1 if there is at least one submodule gitdir in
* $GIT_DIR/modules and 0 otherwise. This follows
* submodule_name_to_gitdir(), which looks for submodules in
* $GIT_DIR/modules, not $GIT_COMMON_DIR.
*
* A submodule can be moved to $GIT_DIR/modules manually by running "git
* submodule absorbgitdirs", or it may be initialized there by "git
* submodule update".
*/
static int repo_has_absorbed_submodules(struct repository *r)
{
int ret;
struct strbuf buf = STRBUF_INIT;
strbuf_repo_git_path(&buf, r, "modules/");
ret = file_exists(buf.buf) && !is_empty_dir(buf.buf);
strbuf_release(&buf);
return ret;
}
static void calculate_changed_submodule_paths(struct repository *r,
struct string_list *changed_submodule_names)
{
struct strvec argv = STRVEC_INIT;
struct string_list_item *name;
/* No need to check if no submodules would be fetched */
if (!submodule_from_path(r, NULL, NULL) &&
!repo_has_absorbed_submodules(r))
return;
strvec_push(&argv, "--"); /* argv[0] program name */
oid_array_for_each_unique(&ref_tips_after_fetch,
append_oid_to_argv, &argv);
strvec_push(&argv, "--not");
oid_array_for_each_unique(&ref_tips_before_fetch,
append_oid_to_argv, &argv);
/*
* Collect all submodules (whether checked out or not) for which new
* commits have been recorded upstream in "changed_submodule_names".
*/
collect_changed_submodules(r, changed_submodule_names, &argv);
for_each_string_list_item(name, changed_submodule_names) {
struct changed_submodule_data *cs_data = name->util;
const struct submodule *submodule;
const char *path = NULL;
submodule = submodule_from_name(r, null_oid(), name->string);
if (submodule)
path = submodule->path;
else
path = default_name_or_path(name->string);
if (!path)
continue;
if (submodule_has_commits(r, path, null_oid(), &cs_data->new_commits)) {
changed_submodule_data_clear(cs_data);
*name->string = '\0';
}
}
string_list_remove_empty_items(changed_submodule_names, 1);
strvec_clear(&argv);
oid_array_clear(&ref_tips_before_fetch);
oid_array_clear(&ref_tips_after_fetch);
initialized_fetch_ref_tips = 0;
}
int submodule_touches_in_range(struct repository *r,
struct object_id *excl_oid,
struct object_id *incl_oid)
{
struct string_list subs = STRING_LIST_INIT_DUP;
struct strvec args = STRVEC_INIT;
int ret;
/* No need to check if there are no submodules configured */
if (!submodule_from_path(r, NULL, NULL))
return 0;
strvec_push(&args, "--"); /* args[0] program name */
strvec_push(&args, oid_to_hex(incl_oid));
if (!is_null_oid(excl_oid)) {
strvec_push(&args, "--not");
strvec_push(&args, oid_to_hex(excl_oid));
}
collect_changed_submodules(r, &subs, &args);
ret = subs.nr;
strvec_clear(&args);
free_submodules_data(&subs);
return ret;
}
struct submodule_parallel_fetch {
/*
* The index of the last index entry processed by
* get_fetch_task_from_index().
*/
int index_count;
/*
* The index of the last string_list entry processed by
* get_fetch_task_from_changed().
*/
int changed_count;
struct strvec args;
struct repository *r;
const char *prefix;
int command_line_option;
int default_option;
int quiet;
int result;
/*
* Names of submodules that have new commits. Generated by
* walking the newly fetched superproject commits.
*/
struct string_list changed_submodule_names;
/*
* Names of submodules that have already been processed. Lets us
* avoid fetching the same submodule more than once.
*/
struct string_list seen_submodule_names;
/* Pending fetches by OIDs */
struct fetch_task **oid_fetch_tasks;
int oid_fetch_tasks_nr, oid_fetch_tasks_alloc;
struct strbuf submodules_with_errors;
};
#define SPF_INIT { \
.args = STRVEC_INIT, \
.changed_submodule_names = STRING_LIST_INIT_DUP, \
.seen_submodule_names = STRING_LIST_INIT_DUP, \
.submodules_with_errors = STRBUF_INIT, \
}
static int get_fetch_recurse_config(const struct submodule *submodule,
struct submodule_parallel_fetch *spf)
{
if (spf->command_line_option != RECURSE_SUBMODULES_DEFAULT)
return spf->command_line_option;
if (submodule) {
char *key;
const char *value;
int fetch_recurse = submodule->fetch_recurse;
key = xstrfmt("submodule.%s.fetchRecurseSubmodules", submodule->name);
if (!repo_config_get_string_tmp(spf->r, key, &value)) {
fetch_recurse = parse_fetch_recurse_submodules_arg(key, value);
}
free(key);
if (fetch_recurse != RECURSE_SUBMODULES_NONE)
/* local config overrules everything except commandline */
return fetch_recurse;
}
return spf->default_option;
}
/*
* Fetch in progress (if callback data) or
* pending (if in oid_fetch_tasks in struct submodule_parallel_fetch)
*/
struct fetch_task {
struct repository *repo;
const struct submodule *sub;
unsigned free_sub : 1; /* Do we need to free the submodule? */
const char *default_argv; /* The default fetch mode. */
struct strvec git_args; /* Args for the child git process. */
struct oid_array *commits; /* Ensure these commits are fetched */
};
/**
* When a submodule is not defined in .gitmodules, we cannot access it
* via the regular submodule-config. Create a fake submodule, which we can
* work on.
*/
static const struct submodule *get_non_gitmodules_submodule(const char *path)
{
struct submodule *ret = NULL;
const char *name = default_name_or_path(path);
if (!name)
return NULL;
ret = xmalloc(sizeof(*ret));
memset(ret, 0, sizeof(*ret));
ret->path = name;
ret->name = name;
return (const struct submodule *) ret;
}
static void fetch_task_release(struct fetch_task *p)
{
if (p->free_sub)
free((void*)p->sub);
p->free_sub = 0;
p->sub = NULL;
if (p->repo)
repo_clear(p->repo);
FREE_AND_NULL(p->repo);
strvec_clear(&p->git_args);
}
static struct repository *get_submodule_repo_for(struct repository *r,
const char *path,
const struct object_id *treeish_name)
{
struct repository *ret = xmalloc(sizeof(*ret));
if (repo_submodule_init(ret, r, path, treeish_name)) {
free(ret);
return NULL;
}
return ret;
}
static struct fetch_task *fetch_task_create(struct submodule_parallel_fetch *spf,
const char *path,
const struct object_id *treeish_name)
{
struct fetch_task *task = xmalloc(sizeof(*task));
memset(task, 0, sizeof(*task));
if (validate_submodule_path(path) < 0)
exit(128);
task->sub = submodule_from_path(spf->r, treeish_name, path);
if (!task->sub) {
/*
* No entry in .gitmodules? Technically not a submodule,
* but historically we supported repositories that happen to be
* in-place where a gitlink is. Keep supporting them.
*/
task->sub = get_non_gitmodules_submodule(path);
if (!task->sub)
goto cleanup;
task->free_sub = 1;
}
if (string_list_lookup(&spf->seen_submodule_names, task->sub->name))
goto cleanup;
switch (get_fetch_recurse_config(task->sub, spf))
{
default:
case RECURSE_SUBMODULES_DEFAULT:
case RECURSE_SUBMODULES_ON_DEMAND:
if (!task->sub ||
!string_list_lookup(
&spf->changed_submodule_names,
task->sub->name))
goto cleanup;
task->default_argv = "on-demand";
break;
case RECURSE_SUBMODULES_ON:
task->default_argv = "yes";
break;
case RECURSE_SUBMODULES_OFF:
goto cleanup;
}
task->repo = get_submodule_repo_for(spf->r, path, treeish_name);
return task;
cleanup:
fetch_task_release(task);
free(task);
return NULL;
}
static struct fetch_task *
get_fetch_task_from_index(struct submodule_parallel_fetch *spf,
struct strbuf *err)
{
for (; spf->index_count < spf->r->index->cache_nr; spf->index_count++) {
const struct cache_entry *ce =
spf->r->index->cache[spf->index_count];
struct fetch_task *task;
if (!S_ISGITLINK(ce->ce_mode))
continue;
task = fetch_task_create(spf, ce->name, null_oid());
if (!task)
continue;
if (task->repo) {
if (!spf->quiet)
strbuf_addf(err, _("Fetching submodule %s%s\n"),
spf->prefix, ce->name);
spf->index_count++;
return task;
} else {
struct strbuf empty_submodule_path = STRBUF_INIT;
fetch_task_release(task);
free(task);
/*
* An empty directory is normal,
* the submodule is not initialized
*/
strbuf_addf(&empty_submodule_path, "%s/%s/",
spf->r->worktree,
ce->name);
if (S_ISGITLINK(ce->ce_mode) &&
!is_empty_dir(empty_submodule_path.buf)) {
spf->result = 1;
strbuf_addf(err,
_("Could not access submodule '%s'\n"),
ce->name);
}
strbuf_release(&empty_submodule_path);
}
}
return NULL;
}
static struct fetch_task *
get_fetch_task_from_changed(struct submodule_parallel_fetch *spf,
struct strbuf *err)
{
for (; spf->changed_count < spf->changed_submodule_names.nr;
spf->changed_count++) {
struct string_list_item item =
spf->changed_submodule_names.items[spf->changed_count];
struct changed_submodule_data *cs_data = item.util;
struct fetch_task *task;
if (!is_tree_submodule_active(spf->r, cs_data->super_oid,cs_data->path))
continue;
task = fetch_task_create(spf, cs_data->path,
cs_data->super_oid);
if (!task)
continue;
if (!task->repo) {
strbuf_addf(err, _("Could not access submodule '%s' at commit %s\n"),
cs_data->path,
find_unique_abbrev(cs_data->super_oid, DEFAULT_ABBREV));
fetch_task_release(task);
free(task);
continue;
}
if (!spf->quiet)
strbuf_addf(err,
_("Fetching submodule %s%s at commit %s\n"),
spf->prefix, task->sub->path,
find_unique_abbrev(cs_data->super_oid,
DEFAULT_ABBREV));
spf->changed_count++;
/*
* NEEDSWORK: Submodules set/unset a value for
* core.worktree when they are populated/unpopulated by
* "git checkout" (and similar commands, see
* submodule_move_head() and
* connect_work_tree_and_git_dir()), but if the
* submodule is unpopulated in another way (e.g. "git
* rm", "rm -r"), core.worktree will still be set even
* though the directory doesn't exist, and the child
* process will crash while trying to chdir into the
* nonexistent directory.
*
* In this case, we know that the submodule has no
* working tree, so we can work around this by
* setting "--work-tree=." (--bare does not work because
* worktree settings take precedence over bare-ness).
* However, this is not necessarily true in other cases,
* so a generalized solution is still necessary.
*
* Possible solutions:
* - teach "git [add|rm]" to unset core.worktree and
* discourage users from removing submodules without
* using a Git command.
* - teach submodule child processes to ignore stale
* core.worktree values.
*/
strvec_push(&task->git_args, "--work-tree=.");
return task;
}
return NULL;
}
static int get_next_submodule(struct child_process *cp, struct strbuf *err,
void *data, void **task_cb)
{
struct submodule_parallel_fetch *spf = data;
struct fetch_task *task =
get_fetch_task_from_index(spf, err);
if (!task)
task = get_fetch_task_from_changed(spf, err);
if (task) {
struct strbuf submodule_prefix = STRBUF_INIT;
child_process_init(cp);
cp->dir = task->repo->gitdir;
prepare_submodule_repo_env_in_gitdir(&cp->env);
cp->git_cmd = 1;
strvec_init(&cp->args);
if (task->git_args.nr)
strvec_pushv(&cp->args, task->git_args.v);
strvec_pushv(&cp->args, spf->args.v);
strvec_push(&cp->args, task->default_argv);
strvec_push(&cp->args, "--submodule-prefix");
strbuf_addf(&submodule_prefix, "%s%s/",
spf->prefix,
task->sub->path);
strvec_push(&cp->args, submodule_prefix.buf);
*task_cb = task;
strbuf_release(&submodule_prefix);
string_list_insert(&spf->seen_submodule_names, task->sub->name);
return 1;
}
if (spf->oid_fetch_tasks_nr) {
struct fetch_task *task =
spf->oid_fetch_tasks[spf->oid_fetch_tasks_nr - 1];
struct strbuf submodule_prefix = STRBUF_INIT;
spf->oid_fetch_tasks_nr--;
strbuf_addf(&submodule_prefix, "%s%s/",
spf->prefix, task->sub->path);
child_process_init(cp);
prepare_submodule_repo_env_in_gitdir(&cp->env);
cp->git_cmd = 1;
cp->dir = task->repo->gitdir;
strvec_init(&cp->args);
strvec_pushv(&cp->args, spf->args.v);
strvec_push(&cp->args, "on-demand");
strvec_push(&cp->args, "--submodule-prefix");
strvec_push(&cp->args, submodule_prefix.buf);
/* NEEDSWORK: have get_default_remote from submodule--helper */
strvec_push(&cp->args, "origin");
oid_array_for_each_unique(task->commits,
append_oid_to_argv, &cp->args);
*task_cb = task;
strbuf_release(&submodule_prefix);
return 1;
}
return 0;
}
static int fetch_start_failure(struct strbuf *err,
void *cb, void *task_cb)
{
struct submodule_parallel_fetch *spf = cb;
struct fetch_task *task = task_cb;
spf->result = 1;
fetch_task_release(task);
return 0;
}
static int commit_missing_in_sub(const struct object_id *oid, void *data)
{
struct repository *subrepo = data;
enum object_type type = oid_object_info(subrepo, oid, NULL);
return type != OBJ_COMMIT;
}
static int fetch_finish(int retvalue, struct strbuf *err,
void *cb, void *task_cb)
{
struct submodule_parallel_fetch *spf = cb;
struct fetch_task *task = task_cb;
struct string_list_item *it;
struct changed_submodule_data *cs_data;
if (!task || !task->sub)
BUG("callback cookie bogus");
if (retvalue) {
/*
* NEEDSWORK: This indicates that the overall fetch
* failed, even though there may be a subsequent fetch
* by commit hash that might work. It may be a good
* idea to not indicate failure in this case, and only
* indicate failure if the subsequent fetch fails.
*/
spf->result = 1;
strbuf_addf(&spf->submodules_with_errors, "\t%s\n",
task->sub->name);
}
/* Is this the second time we process this submodule? */
if (task->commits)
goto out;
it = string_list_lookup(&spf->changed_submodule_names, task->sub->name);
if (!it)
/* Could be an unchanged submodule, not contained in the list */
goto out;
cs_data = it->util;
oid_array_filter(&cs_data->new_commits,
commit_missing_in_sub,
task->repo);
/* Are there commits we want, but do not exist? */
if (cs_data->new_commits.nr) {
task->commits = &cs_data->new_commits;
ALLOC_GROW(spf->oid_fetch_tasks,
spf->oid_fetch_tasks_nr + 1,
spf->oid_fetch_tasks_alloc);
spf->oid_fetch_tasks[spf->oid_fetch_tasks_nr] = task;
spf->oid_fetch_tasks_nr++;
return 0;
}
out:
fetch_task_release(task);
return 0;
}
int fetch_submodules(struct repository *r,
const struct strvec *options,
const char *prefix, int command_line_option,
int default_option,
int quiet, int max_parallel_jobs)
{
int i;
struct submodule_parallel_fetch spf = SPF_INIT;
const struct run_process_parallel_opts opts = {
.tr2_category = "submodule",
.tr2_label = "parallel/fetch",
.processes = max_parallel_jobs,
.get_next_task = get_next_submodule,
.start_failure = fetch_start_failure,
.task_finished = fetch_finish,
.data = &spf,
};
spf.r = r;
spf.command_line_option = command_line_option;
spf.default_option = default_option;
spf.quiet = quiet;
spf.prefix = prefix;
if (!r->worktree)
goto out;
if (repo_read_index(r) < 0)
die(_("index file corrupt"));
strvec_push(&spf.args, "fetch");
for (i = 0; i < options->nr; i++)
strvec_push(&spf.args, options->v[i]);
strvec_push(&spf.args, "--recurse-submodules-default");
/* default value, "--submodule-prefix" and its value are added later */
calculate_changed_submodule_paths(r, &spf.changed_submodule_names);
string_list_sort(&spf.changed_submodule_names);
run_processes_parallel(&opts);
if (spf.submodules_with_errors.len > 0)
fprintf(stderr, _("Errors during submodule fetch:\n%s"),
spf.submodules_with_errors.buf);
strvec_clear(&spf.args);
out:
free_submodules_data(&spf.changed_submodule_names);
return spf.result;
}
unsigned is_submodule_modified(const char *path, int ignore_untracked)
{
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf buf = STRBUF_INIT;
FILE *fp;
unsigned dirty_submodule = 0;
const char *git_dir;
int ignore_cp_exit_code = 0;
if (validate_submodule_path(path) < 0)
exit(128);
strbuf_addf(&buf, "%s/.git", path);
git_dir = read_gitfile(buf.buf);
if (!git_dir)
git_dir = buf.buf;
if (!is_git_directory(git_dir)) {
if (is_directory(git_dir))
die(_("'%s' not recognized as a git repository"), git_dir);
strbuf_release(&buf);
/* The submodule is not checked out, so it is not modified */
return 0;
}
strbuf_reset(&buf);
strvec_pushl(&cp.args, "status", "--porcelain=2", NULL);
if (ignore_untracked)
strvec_push(&cp.args, "-uno");
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.out = -1;
cp.dir = path;
if (start_command(&cp))
die(_("Could not run 'git status --porcelain=2' in submodule %s"), path);
fp = xfdopen(cp.out, "r");
while (strbuf_getwholeline(&buf, fp, '\n') != EOF) {
/* regular untracked files */
if (buf.buf[0] == '?')
dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
if (buf.buf[0] == 'u' ||
buf.buf[0] == '1' ||
buf.buf[0] == '2') {
/* T = line type, XY = status, SSSS = submodule state */
if (buf.len < strlen("T XY SSSS"))
BUG("invalid status --porcelain=2 line %s",
buf.buf);
if (buf.buf[5] == 'S' && buf.buf[8] == 'U')
/* nested untracked file */
dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
if (buf.buf[0] == 'u' ||
buf.buf[0] == '2' ||
memcmp(buf.buf + 5, "S..U", 4))
/* other change */
dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
}
if ((dirty_submodule & DIRTY_SUBMODULE_MODIFIED) &&
((dirty_submodule & DIRTY_SUBMODULE_UNTRACKED) ||
ignore_untracked)) {
/*
* We're not interested in any further information from
* the child any more, neither output nor its exit code.
*/
ignore_cp_exit_code = 1;
break;
}
}
fclose(fp);
if (finish_command(&cp) && !ignore_cp_exit_code)
die(_("'git status --porcelain=2' failed in submodule %s"), path);
strbuf_release(&buf);
return dirty_submodule;
}
int submodule_uses_gitfile(const char *path)
{
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf buf = STRBUF_INIT;
const char *git_dir;
if (validate_submodule_path(path) < 0)
exit(128);
strbuf_addf(&buf, "%s/.git", path);
git_dir = read_gitfile(buf.buf);
if (!git_dir) {
strbuf_release(&buf);
return 0;
}
strbuf_release(&buf);
/* Now test that all nested submodules use a gitfile too */
strvec_pushl(&cp.args,
"submodule", "foreach", "--quiet", "--recursive",
"test -f .git", NULL);
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.no_stderr = 1;
cp.no_stdout = 1;
cp.dir = path;
if (run_command(&cp))
return 0;
return 1;
}
/*
* Check if it is a bad idea to remove a submodule, i.e. if we'd lose data
* when doing so.
*
* Return 1 if we'd lose data, return 0 if the removal is fine,
* and negative values for errors.
*/
int bad_to_remove_submodule(const char *path, unsigned flags)
{
ssize_t len;
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf buf = STRBUF_INIT;
int ret = 0;
if (validate_submodule_path(path) < 0)
exit(128);
if (!file_exists(path) || is_empty_dir(path))
return 0;
if (!submodule_uses_gitfile(path))
return 1;
strvec_pushl(&cp.args, "status", "--porcelain",
"--ignore-submodules=none", NULL);
if (flags & SUBMODULE_REMOVAL_IGNORE_UNTRACKED)
strvec_push(&cp.args, "-uno");
else
strvec_push(&cp.args, "-uall");
if (!(flags & SUBMODULE_REMOVAL_IGNORE_IGNORED_UNTRACKED))
strvec_push(&cp.args, "--ignored");
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.out = -1;
cp.dir = path;
if (start_command(&cp)) {
if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
die(_("could not start 'git status' in submodule '%s'"),
path);
ret = -1;
goto out;
}
len = strbuf_read(&buf, cp.out, 1024);
if (len > 2)
ret = 1;
close(cp.out);
if (finish_command(&cp)) {
if (flags & SUBMODULE_REMOVAL_DIE_ON_ERROR)
die(_("could not run 'git status' in submodule '%s'"),
path);
ret = -1;
}
out:
strbuf_release(&buf);
return ret;
}
void submodule_unset_core_worktree(const struct submodule *sub)
{
struct strbuf config_path = STRBUF_INIT;
if (validate_submodule_path(sub->path) < 0)
exit(128);
submodule_name_to_gitdir(&config_path, the_repository, sub->name);
strbuf_addstr(&config_path, "/config");
if (git_config_set_in_file_gently(config_path.buf, "core.worktree", NULL))
warning(_("Could not unset core.worktree setting in submodule '%s'"),
sub->path);
strbuf_release(&config_path);
}
static const char *get_super_prefix_or_empty(void)
{
const char *s = get_super_prefix();
if (!s)
s = "";
return s;
}
static int submodule_has_dirty_index(const struct submodule *sub)
{
struct child_process cp = CHILD_PROCESS_INIT;
if (validate_submodule_path(sub->path) < 0)
exit(128);
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
strvec_pushl(&cp.args, "diff-index", "--quiet",
"--cached", "HEAD", NULL);
cp.no_stdin = 1;
cp.no_stdout = 1;
cp.dir = sub->path;
if (start_command(&cp))
die(_("could not recurse into submodule '%s'"), sub->path);
return finish_command(&cp);
}
static void submodule_reset_index(const char *path)
{
struct child_process cp = CHILD_PROCESS_INIT;
if (validate_submodule_path(path) < 0)
exit(128);
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;
strvec_pushf(&cp.args, "--super-prefix=%s%s/",
get_super_prefix_or_empty(), path);
/* TODO: determine if this might overwright untracked files */
strvec_pushl(&cp.args, "read-tree", "-u", "--reset", NULL);
strvec_push(&cp.args, empty_tree_oid_hex());
if (run_command(&cp))
die(_("could not reset submodule index"));
}
/**
* Moves a submodule at a given path from a given head to another new head.
* For edge cases (a submodule coming into existence or removing a submodule)
* pass NULL for old or new respectively.
*/
int submodule_move_head(const char *path,
const char *old_head,
const char *new_head,
unsigned flags)
{
int ret = 0;
struct child_process cp = CHILD_PROCESS_INIT;
const struct submodule *sub;
int *error_code_ptr, error_code;
if (!is_submodule_active(the_repository, path))
return 0;
if (flags & SUBMODULE_MOVE_HEAD_FORCE)
/*
* Pass non NULL pointer to is_submodule_populated_gently
* to prevent die()-ing. We'll use connect_work_tree_and_git_dir
* to fixup the submodule in the force case later.
*/
error_code_ptr = &error_code;
else
error_code_ptr = NULL;
if (old_head && !is_submodule_populated_gently(path, error_code_ptr))
return 0;
sub = submodule_from_path(the_repository, null_oid(), path);
if (!sub)
BUG("could not get submodule information for '%s'", path);
if (old_head && !(flags & SUBMODULE_MOVE_HEAD_FORCE)) {
/* Check if the submodule has a dirty index. */
if (submodule_has_dirty_index(sub))
return error(_("submodule '%s' has dirty index"), path);
}
if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
if (old_head) {
if (!submodule_uses_gitfile(path))
absorb_git_dir_into_superproject(path);
else {
char *dotgit = xstrfmt("%s/.git", path);
char *git_dir = xstrdup(read_gitfile(dotgit));
free(dotgit);
if (validate_submodule_git_dir(git_dir,
sub->name) < 0)
die(_("refusing to create/use '%s' in "
"another submodule's git dir"),
git_dir);
free(git_dir);
}
} else {
struct strbuf gitdir = STRBUF_INIT;
submodule_name_to_gitdir(&gitdir, the_repository,
sub->name);
if (validate_submodule_git_dir(gitdir.buf,
sub->name) < 0)
die(_("refusing to create/use '%s' in another "
"submodule's git dir"),
gitdir.buf);
connect_work_tree_and_git_dir(path, gitdir.buf, 0);
strbuf_release(&gitdir);
/* make sure the index is clean as well */
submodule_reset_index(path);
}
if (old_head && (flags & SUBMODULE_MOVE_HEAD_FORCE)) {
struct strbuf gitdir = STRBUF_INIT;
submodule_name_to_gitdir(&gitdir, the_repository,
sub->name);
connect_work_tree_and_git_dir(path, gitdir.buf, 1);
strbuf_release(&gitdir);
}
}
prepare_submodule_repo_env(&cp.env);
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;
strvec_pushf(&cp.args, "--super-prefix=%s%s/",
get_super_prefix_or_empty(), path);
strvec_pushl(&cp.args, "read-tree", "--recurse-submodules", NULL);
if (flags & SUBMODULE_MOVE_HEAD_DRY_RUN)
strvec_push(&cp.args, "-n");
else
strvec_push(&cp.args, "-u");
if (flags & SUBMODULE_MOVE_HEAD_FORCE)
strvec_push(&cp.args, "--reset");
else
strvec_push(&cp.args, "-m");
if (!(flags & SUBMODULE_MOVE_HEAD_FORCE))
strvec_push(&cp.args, old_head ? old_head : empty_tree_oid_hex());
strvec_push(&cp.args, new_head ? new_head : empty_tree_oid_hex());
if (run_command(&cp)) {
ret = error(_("Submodule '%s' could not be updated."), path);
goto out;
}
if (!(flags & SUBMODULE_MOVE_HEAD_DRY_RUN)) {
if (new_head) {
child_process_init(&cp);
/* also set the HEAD accordingly */
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;
prepare_submodule_repo_env(&cp.env);
strvec_pushl(&cp.args, "update-ref", "HEAD",
"--no-deref", new_head, NULL);
if (run_command(&cp)) {
ret = -1;
goto out;
}
} else {
struct strbuf sb = STRBUF_INIT;
strbuf_addf(&sb, "%s/.git", path);
unlink_or_warn(sb.buf);
strbuf_release(&sb);
if (is_empty_dir(path))
rmdir_or_warn(path);
submodule_unset_core_worktree(sub);
}
}
out:
return ret;
}
int validate_submodule_git_dir(char *git_dir, const char *submodule_name)
{
size_t len = strlen(git_dir), suffix_len = strlen(submodule_name);
char *p;
int ret = 0;
if (len <= suffix_len || (p = git_dir + len - suffix_len)[-1] != '/' ||
strcmp(p, submodule_name))
BUG("submodule name '%s' not a suffix of git dir '%s'",
submodule_name, git_dir);
/*
* We prevent the contents of sibling submodules' git directories to
* clash.
*
* Example: having a submodule named `hippo` and another one named
* `hippo/hooks` would result in the git directories
* `.git/modules/hippo/` and `.git/modules/hippo/hooks/`, respectively,
* but the latter directory is already designated to contain the hooks
* of the former.
*/
for (; *p; p++) {
if (is_dir_sep(*p)) {
char c = *p;
*p = '\0';
if (is_git_directory(git_dir))
ret = -1;
*p = c;
if (ret < 0)
return error(_("submodule git dir '%s' is "
"inside git dir '%.*s'"),
git_dir,
(int)(p - git_dir), git_dir);
}
}
return 0;
}
int validate_submodule_path(const char *path)
{
char *p = xstrdup(path);
struct stat st;
int i, ret = 0;
char sep;
for (i = 0; !ret && p[i]; i++) {
if (!is_dir_sep(p[i]))
continue;
sep = p[i];
p[i] = '\0';
/* allow missing components, but no symlinks */
ret = lstat(p, &st) || !S_ISLNK(st.st_mode) ? 0 : -1;
p[i] = sep;
if (ret)
error(_("expected '%.*s' in submodule path '%s' not to "
"be a symbolic link"), i, p, p);
}
if (!lstat(p, &st) && S_ISLNK(st.st_mode))
ret = error(_("expected submodule path '%s' not to be a "
"symbolic link"), p);
free(p);
return ret;
}
/*
* Embeds a single submodules git directory into the superprojects git dir,
* non recursively.
*/
static void relocate_single_git_dir_into_superproject(const char *path)
{
char *old_git_dir = NULL, *real_old_git_dir = NULL, *real_new_git_dir = NULL;
struct strbuf new_gitdir = STRBUF_INIT;
const struct submodule *sub;
if (validate_submodule_path(path) < 0)
exit(128);
if (submodule_uses_worktrees(path))
die(_("relocate_gitdir for submodule '%s' with "
"more than one worktree not supported"), path);
old_git_dir = xstrfmt("%s/.git", path);
if (read_gitfile(old_git_dir))
/* If it is an actual gitfile, it doesn't need migration. */
return;
real_old_git_dir = real_pathdup(old_git_dir, 1);
sub = submodule_from_path(the_repository, null_oid(), path);
if (!sub)
die(_("could not lookup name for submodule '%s'"), path);
submodule_name_to_gitdir(&new_gitdir, the_repository, sub->name);
if (validate_submodule_git_dir(new_gitdir.buf, sub->name) < 0)
die(_("refusing to move '%s' into an existing git dir"),
real_old_git_dir);
if (safe_create_leading_directories_const(new_gitdir.buf) < 0)
die(_("could not create directory '%s'"), new_gitdir.buf);
real_new_git_dir = real_pathdup(new_gitdir.buf, 1);
fprintf(stderr, _("Migrating git directory of '%s%s' from\n'%s' to\n'%s'\n"),
get_super_prefix_or_empty(), path,
real_old_git_dir, real_new_git_dir);
relocate_gitdir(path, real_old_git_dir, real_new_git_dir);
free(old_git_dir);
free(real_old_git_dir);
free(real_new_git_dir);
strbuf_release(&new_gitdir);
}
static void absorb_git_dir_into_superproject_recurse(const char *path)
{
struct child_process cp = CHILD_PROCESS_INIT;
if (validate_submodule_path(path) < 0)
exit(128);
cp.dir = path;
cp.git_cmd = 1;
cp.no_stdin = 1;
strvec_pushf(&cp.args, "--super-prefix=%s%s/",
get_super_prefix_or_empty(), path);
strvec_pushl(&cp.args, "submodule--helper",
"absorbgitdirs", NULL);
prepare_submodule_repo_env(&cp.env);
if (run_command(&cp))
die(_("could not recurse into submodule '%s'"), path);
}
/*
* Migrate the git directory of the submodule given by path from
* having its git directory within the working tree to the git dir nested
* in its superprojects git dir under modules/.
*/
void absorb_git_dir_into_superproject(const char *path)
{
int err_code;
const char *sub_git_dir;
struct strbuf gitdir = STRBUF_INIT;
if (validate_submodule_path(path) < 0)
exit(128);
strbuf_addf(&gitdir, "%s/.git", path);
sub_git_dir = resolve_gitdir_gently(gitdir.buf, &err_code);
/* Not populated? */
if (!sub_git_dir) {
const struct submodule *sub;
struct strbuf sub_gitdir = STRBUF_INIT;
if (err_code == READ_GITFILE_ERR_STAT_FAILED) {
/* unpopulated as expected */
strbuf_release(&gitdir);
return;
}
if (err_code != READ_GITFILE_ERR_NOT_A_REPO)
/* We don't know what broke here. */
read_gitfile_error_die(err_code, path, NULL);
/*
* Maybe populated, but no git directory was found?
* This can happen if the superproject is a submodule
* itself and was just absorbed. The absorption of the
* superproject did not rewrite the git file links yet,
* fix it now.
*/
sub = submodule_from_path(the_repository, null_oid(), path);
if (!sub)
die(_("could not lookup name for submodule '%s'"), path);
submodule_name_to_gitdir(&sub_gitdir, the_repository, sub->name);
connect_work_tree_and_git_dir(path, sub_gitdir.buf, 0);
strbuf_release(&sub_gitdir);
} else {
/* Is it already absorbed into the superprojects git dir? */
char *real_sub_git_dir = real_pathdup(sub_git_dir, 1);
char *real_common_git_dir = real_pathdup(get_git_common_dir(), 1);
if (!starts_with(real_sub_git_dir, real_common_git_dir))
relocate_single_git_dir_into_superproject(path);
free(real_sub_git_dir);
free(real_common_git_dir);
}
strbuf_release(&gitdir);
absorb_git_dir_into_superproject_recurse(path);
}
int get_superproject_working_tree(struct strbuf *buf)
{
struct child_process cp = CHILD_PROCESS_INIT;
struct strbuf sb = STRBUF_INIT;
struct strbuf one_up = STRBUF_INIT;
char *cwd = xgetcwd();
int ret = 0;
const char *subpath;
int code;
ssize_t len;
if (!is_inside_work_tree())
/*
* FIXME:
* We might have a superproject, but it is harder
* to determine.
*/
return 0;
if (!strbuf_realpath(&one_up, "../", 0))
return 0;
subpath = relative_path(cwd, one_up.buf, &sb);
strbuf_release(&one_up);
prepare_submodule_repo_env(&cp.env);
strvec_pop(&cp.env);
strvec_pushl(&cp.args, "--literal-pathspecs", "-C", "..",
"ls-files", "-z", "--stage", "--full-name", "--",
subpath, NULL);
strbuf_reset(&sb);
cp.no_stdin = 1;
cp.no_stderr = 1;
cp.out = -1;
cp.git_cmd = 1;
if (start_command(&cp))
die(_("could not start ls-files in .."));
len = strbuf_read(&sb, cp.out, PATH_MAX);
close(cp.out);
if (starts_with(sb.buf, "160000")) {
int super_sub_len;
int cwd_len = strlen(cwd);
char *super_sub, *super_wt;
/*
* There is a superproject having this repo as a submodule.
* The format is <mode> SP <hash> SP <stage> TAB <full name> \0,
* We're only interested in the name after the tab.
*/
super_sub = strchr(sb.buf, '\t') + 1;
super_sub_len = strlen(super_sub);
if (super_sub_len > cwd_len ||
strcmp(&cwd[cwd_len - super_sub_len], super_sub))
BUG("returned path string doesn't match cwd?");
super_wt = xstrdup(cwd);
super_wt[cwd_len - super_sub_len] = '\0';
strbuf_realpath(buf, super_wt, 1);
ret = 1;
free(super_wt);
}
free(cwd);
strbuf_release(&sb);
code = finish_command(&cp);
if (code == 128)
/* '../' is not a git repository */
return 0;
if (code == 0 && len == 0)
/* There is an unrelated git repository at '../' */
return 0;
if (code)
die(_("ls-tree returned unexpected return code %d"), code);
return ret;
}
/*
* Put the gitdir for a submodule (given relative to the main
* repository worktree) into `buf`, or return -1 on error.
*/
int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
{
const struct submodule *sub;
const char *git_dir;
int ret = 0;
if (validate_submodule_path(submodule) < 0)
exit(128);
strbuf_reset(buf);
strbuf_addstr(buf, submodule);
strbuf_complete(buf, '/');
strbuf_addstr(buf, ".git");
git_dir = read_gitfile(buf->buf);
if (git_dir) {
strbuf_reset(buf);
strbuf_addstr(buf, git_dir);
}
if (!is_git_directory(buf->buf)) {
sub = submodule_from_path(the_repository, null_oid(),
submodule);
if (!sub) {
ret = -1;
goto cleanup;
}
strbuf_reset(buf);
submodule_name_to_gitdir(buf, the_repository, sub->name);
}
cleanup:
return ret;
}
void submodule_name_to_gitdir(struct strbuf *buf, struct repository *r,
const char *submodule_name)
{
/*
* NEEDSWORK: The current way of mapping a submodule's name to
* its location in .git/modules/ has problems with some naming
* schemes. For example, if a submodule is named "foo" and
* another is named "foo/bar" (whether present in the same
* superproject commit or not - the problem will arise if both
* superproject commits have been checked out at any point in
* time), or if two submodule names only have different cases in
* a case-insensitive filesystem.
*
* There are several solutions, including encoding the path in
* some way, introducing a submodule.<name>.gitdir config in
* .git/config (not .gitmodules) that allows overriding what the
* gitdir of a submodule would be (and teach Git, upon noticing
* a clash, to automatically determine a non-clashing name and
* to write such a config), or introducing a
* submodule.<name>.gitdir config in .gitmodules that repo
* administrators can explicitly set. Nothing has been decided,
* so for now, just append the name at the end of the path.
*/
strbuf_repo_git_path(buf, r, "modules/");
strbuf_addstr(buf, submodule_name);
}
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