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#include "cache.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 "sha1-array.h"
#include "argv-array.h"

static struct string_list config_name_for_path;
static struct string_list config_fetch_recurse_submodules_for_name;
static struct string_list config_ignore_for_name;
static int config_fetch_recurse_submodules = RECURSE_SUBMODULES_ON_DEMAND;
static struct string_list changed_submodule_paths;
static int initialized_fetch_ref_tips;
static struct sha1_array ref_tips_before_fetch;
static struct sha1_array ref_tips_after_fetch;

/*
* The following flag is set if the .gitmodules file is unmerged. We then
* disable recursion for all submodules where .git/config doesn't have a
* matching config entry because we can't guess what might be configured in
* .gitmodules unless the user resolves the conflict. When a command line
* option is given (which always overrides configuration) this flag will be
* ignored.
*/
static int gitmodules_is_unmerged;

static int add_submodule_odb(const char *path)
{
struct strbuf objects_directory = STRBUF_INIT;
struct alternate_object_database *alt_odb;
int ret = 0;
const char *git_dir;

strbuf_addf(&objects_directory, "%s/.git", path);
git_dir = read_gitfile(objects_directory.buf);
if (git_dir) {
strbuf_reset(&objects_directory);
strbuf_addstr(&objects_directory, git_dir);
}
strbuf_addstr(&objects_directory, "/objects/");
if (!is_directory(objects_directory.buf)) {
ret = -1;
goto done;
}
/* avoid adding it twice */
for (alt_odb = alt_odb_list; alt_odb; alt_odb = alt_odb->next)
if (alt_odb->name - alt_odb->base == objects_directory.len &&
!strncmp(alt_odb->base, objects_directory.buf,
objects_directory.len))
goto done;

alt_odb = xmalloc(objects_directory.len + 42 + sizeof(*alt_odb));
alt_odb->next = alt_odb_list;
strcpy(alt_odb->base, objects_directory.buf);
alt_odb->name = alt_odb->base + objects_directory.len;
alt_odb->name[2] = '/';
alt_odb->name[40] = '\0';
alt_odb->name[41] = '\0';
alt_odb_list = alt_odb;

/* add possible alternates from the submodule */
read_info_alternates(objects_directory.buf, 0);
prepare_alt_odb();
done:
strbuf_release(&objects_directory);
return ret;
}

void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
const char *path)
{
struct string_list_item *path_option, *ignore_option;
path_option = unsorted_string_list_lookup(&config_name_for_path, path);
if (path_option) {
ignore_option = unsorted_string_list_lookup(&config_ignore_for_name, path_option->util);
if (ignore_option)
handle_ignore_submodules_arg(diffopt, ignore_option->util);
else if (gitmodules_is_unmerged)
DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
}
}

int submodule_config(const char *var, const char *value, void *cb)
{
if (!prefixcmp(var, "submodule."))
return parse_submodule_config_option(var, value);
else if (!strcmp(var, "fetch.recursesubmodules")) {
config_fetch_recurse_submodules = parse_fetch_recurse_submodules_arg(var, value);
return 0;
}
return 0;
}

void gitmodules_config(void)
{
const char *work_tree = get_git_work_tree();
if (work_tree) {
struct strbuf gitmodules_path = STRBUF_INIT;
int pos;
strbuf_addstr(&gitmodules_path, work_tree);
strbuf_addstr(&gitmodules_path, "/.gitmodules");
if (read_cache() < 0)
die("index file corrupt");
pos = cache_name_pos(".gitmodules", 11);
if (pos < 0) { /* .gitmodules not found or isn't merged */
pos = -1 - pos;
if (active_nr > pos) { /* there is a .gitmodules */
const struct cache_entry *ce = active_cache[pos];
if (ce_namelen(ce) == 11 &&
!memcmp(ce->name, ".gitmodules", 11))
gitmodules_is_unmerged = 1;
}
}

if (!gitmodules_is_unmerged)
git_config_from_file(submodule_config, gitmodules_path.buf, NULL);
strbuf_release(&gitmodules_path);
}
}

int parse_submodule_config_option(const char *var, const char *value)
{
int len;
struct string_list_item *config;
struct strbuf submodname = STRBUF_INIT;

var += 10; /* Skip "submodule." */

len = strlen(var);
if ((len > 5) && !strcmp(var + len - 5, ".path")) {
strbuf_add(&submodname, var, len - 5);
config = unsorted_string_list_lookup(&config_name_for_path, value);
if (config)
free(config->util);
else
config = string_list_append(&config_name_for_path, xstrdup(value));
config->util = strbuf_detach(&submodname, NULL);
strbuf_release(&submodname);
} else if ((len > 23) && !strcmp(var + len - 23, ".fetchrecursesubmodules")) {
strbuf_add(&submodname, var, len - 23);
config = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, submodname.buf);
if (!config)
config = string_list_append(&config_fetch_recurse_submodules_for_name,
strbuf_detach(&submodname, NULL));
config->util = (void *)(intptr_t)parse_fetch_recurse_submodules_arg(var, value);
strbuf_release(&submodname);
} else if ((len > 7) && !strcmp(var + len - 7, ".ignore")) {
if (strcmp(value, "untracked") && strcmp(value, "dirty") &&
strcmp(value, "all") && strcmp(value, "none")) {
warning("Invalid parameter \"%s\" for config option \"submodule.%s.ignore\"", value, var);
return 0;
}

strbuf_add(&submodname, var, len - 7);
config = unsorted_string_list_lookup(&config_ignore_for_name, submodname.buf);
if (config)
free(config->util);
else
config = string_list_append(&config_ignore_for_name,
strbuf_detach(&submodname, NULL));
strbuf_release(&submodname);
config->util = xstrdup(value);
return 0;
}
return 0;
}

void handle_ignore_submodules_arg(struct diff_options *diffopt,
const char *arg)
{
DIFF_OPT_CLR(diffopt, IGNORE_SUBMODULES);
DIFF_OPT_CLR(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
DIFF_OPT_CLR(diffopt, IGNORE_DIRTY_SUBMODULES);

if (!strcmp(arg, "all"))
DIFF_OPT_SET(diffopt, IGNORE_SUBMODULES);
else if (!strcmp(arg, "untracked"))
DIFF_OPT_SET(diffopt, IGNORE_UNTRACKED_IN_SUBMODULES);
else if (!strcmp(arg, "dirty"))
DIFF_OPT_SET(diffopt, IGNORE_DIRTY_SUBMODULES);
else if (strcmp(arg, "none"))
die("bad --ignore-submodules argument: %s", arg);
}

static int prepare_submodule_summary(struct rev_info *rev, const char *path,
struct commit *left, struct commit *right,
int *fast_forward, int *fast_backward)
{
struct commit_list *merge_bases, *list;

init_revisions(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);
merge_bases = get_merge_bases(left, right, 1);
if (merge_bases) {
if (merge_bases->item == left)
*fast_forward = 1;
else if (merge_bases->item == right)
*fast_backward = 1;
}
for (list = merge_bases; list; list = list->next) {
list->item->object.flags |= UNINTERESTING;
add_pending_object(rev, &list->item->object,
sha1_to_hex(list->item->object.sha1));
}
return prepare_revision_walk(rev);
}

static void print_submodule_summary(struct rev_info *rev, FILE *f,
const char *del, const char *add, const char *reset)
{
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;
strbuf_setlen(&sb, 0);
if (commit->object.flags & SYMMETRIC_LEFT) {
if (del)
strbuf_addstr(&sb, del);
}
else if (add)
strbuf_addstr(&sb, add);
format_commit_message(commit, format, &sb, &ctx);
if (reset)
strbuf_addstr(&sb, reset);
strbuf_addch(&sb, '\n');
fprintf(f, "%s", sb.buf);
}
strbuf_release(&sb);
}

int parse_fetch_recurse_submodules_arg(const char *opt, const char *arg)
{
switch (git_config_maybe_bool(opt, arg)) {
case 1:
return RECURSE_SUBMODULES_ON;
case 0:
return RECURSE_SUBMODULES_OFF;
default:
if (!strcmp(arg, "on-demand"))
return RECURSE_SUBMODULES_ON_DEMAND;
die("bad %s argument: %s", opt, arg);
}
}

void show_submodule_summary(FILE *f, const char *path,
unsigned char one[20], unsigned char two[20],
unsigned dirty_submodule,
const char *del, const char *add, const char *reset)
{
struct rev_info rev;
struct commit *left = left, *right = right;
const char *message = NULL;
struct strbuf sb = STRBUF_INIT;
int fast_forward = 0, fast_backward = 0;

if (is_null_sha1(two))
message = "(submodule deleted)";
else if (add_submodule_odb(path))
message = "(not checked out)";
else if (is_null_sha1(one))
message = "(new submodule)";
else if (!(left = lookup_commit_reference(one)) ||
!(right = lookup_commit_reference(two)))
message = "(commits not present)";

if (!message &&
prepare_submodule_summary(&rev, path, left, right,
&fast_forward, &fast_backward))
message = "(revision walker failed)";

if (dirty_submodule & DIRTY_SUBMODULE_UNTRACKED)
fprintf(f, "Submodule %s contains untracked content\n", path);
if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
fprintf(f, "Submodule %s contains modified content\n", path);

if (!hashcmp(one, two)) {
strbuf_release(&sb);
return;
}

strbuf_addf(&sb, "Submodule %s %s..", path,
find_unique_abbrev(one, DEFAULT_ABBREV));
if (!fast_backward && !fast_forward)
strbuf_addch(&sb, '.');
strbuf_addf(&sb, "%s", find_unique_abbrev(two, DEFAULT_ABBREV));
if (message)
strbuf_addf(&sb, " %s\n", message);
else
strbuf_addf(&sb, "%s:\n", fast_backward ? " (rewind)" : "");
fwrite(sb.buf, sb.len, 1, f);

if (!message) {
print_submodule_summary(&rev, f, del, add, reset);
clear_commit_marks(left, ~0);
clear_commit_marks(right, ~0);
}

strbuf_release(&sb);
}

void set_config_fetch_recurse_submodules(int value)
{
config_fetch_recurse_submodules = value;
}

static int has_remote(const char *refname, const unsigned char *sha1, int flags, void *cb_data)
{
return 1;
}

static int submodule_needs_pushing(const char *path, const unsigned char sha1[20])
{
if (add_submodule_odb(path) || !lookup_commit_reference(sha1))
return 0;

if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
struct child_process cp;
const char *argv[] = {"rev-list", NULL, "--not", "--remotes", "-n", "1" , NULL};
struct strbuf buf = STRBUF_INIT;
int needs_pushing = 0;

argv[1] = sha1_to_hex(sha1);
memset(&cp, 0, sizeof(cp));
cp.argv = argv;
cp.env = local_repo_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 %s --not --remotes -n 1' command in submodule %s",
sha1_to_hex(sha1), path);
if (strbuf_read(&buf, cp.out, 41))
needs_pushing = 1;
finish_command(&cp);
close(cp.out);
strbuf_release(&buf);
return needs_pushing;
}

return 0;
}

static void collect_submodules_from_diff(struct diff_queue_struct *q,
struct diff_options *options,
void *data)
{
int i;
struct string_list *needs_pushing = data;

for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (!S_ISGITLINK(p->two->mode))
continue;
if (submodule_needs_pushing(p->two->path, p->two->sha1))
string_list_insert(needs_pushing, p->two->path);
}
}

static void find_unpushed_submodule_commits(struct commit *commit,
struct string_list *needs_pushing)
{
struct rev_info rev;

init_revisions(&rev, NULL);
rev.diffopt.output_format |= DIFF_FORMAT_CALLBACK;
rev.diffopt.format_callback = collect_submodules_from_diff;
rev.diffopt.format_callback_data = needs_pushing;
diff_tree_combined_merge(commit, 1, &rev);
}

int find_unpushed_submodules(unsigned char new_sha1[20],
const char *remotes_name, struct string_list *needs_pushing)
{
struct rev_info rev;
struct commit *commit;
const char *argv[] = {NULL, NULL, "--not", "NULL", NULL};
int argc = ARRAY_SIZE(argv) - 1;
char *sha1_copy;

struct strbuf remotes_arg = STRBUF_INIT;

strbuf_addf(&remotes_arg, "--remotes=%s", remotes_name);
init_revisions(&rev, NULL);
sha1_copy = xstrdup(sha1_to_hex(new_sha1));
argv[1] = sha1_copy;
argv[3] = remotes_arg.buf;
setup_revisions(argc, argv, &rev, NULL);
if (prepare_revision_walk(&rev))
die("revision walk setup failed");

while ((commit = get_revision(&rev)) != NULL)
find_unpushed_submodule_commits(commit, needs_pushing);

reset_revision_walk();
free(sha1_copy);
strbuf_release(&remotes_arg);

return needs_pushing->nr;
}

static int push_submodule(const char *path)
{
if (add_submodule_odb(path))
return 1;

if (for_each_remote_ref_submodule(path, has_remote, NULL) > 0) {
struct child_process cp;
const char *argv[] = {"push", NULL};

memset(&cp, 0, sizeof(cp));
cp.argv = argv;
cp.env = local_repo_env;
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.dir = path;
if (run_command(&cp))
return 0;
close(cp.out);
}

return 1;
}

int push_unpushed_submodules(unsigned char new_sha1[20], const char *remotes_name)
{
int i, ret = 1;
struct string_list needs_pushing;

memset(&needs_pushing, 0, sizeof(struct string_list));
needs_pushing.strdup_strings = 1;

if (!find_unpushed_submodules(new_sha1, remotes_name, &needs_pushing))
return 1;

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)) {
fprintf(stderr, "Unable to push submodule '%s'\n", path);
ret = 0;
}
}

string_list_clear(&needs_pushing, 0);

return ret;
}

static int is_submodule_commit_present(const char *path, unsigned char sha1[20])
{
int is_present = 0;
if (!add_submodule_odb(path) && lookup_commit_reference(sha1)) {
/* Even if the submodule is checked out and the commit is
* present, make sure it is reachable from a ref. */
struct child_process cp;
const char *argv[] = {"rev-list", "-n", "1", NULL, "--not", "--all", NULL};
struct strbuf buf = STRBUF_INIT;

argv[3] = sha1_to_hex(sha1);
memset(&cp, 0, sizeof(cp));
cp.argv = argv;
cp.env = local_repo_env;
cp.git_cmd = 1;
cp.no_stdin = 1;
cp.out = -1;
cp.dir = path;
if (!run_command(&cp) && !strbuf_read(&buf, cp.out, 1024))
is_present = 1;

close(cp.out);
strbuf_release(&buf);
}
return is_present;
}

static void submodule_collect_changed_cb(struct diff_queue_struct *q,
struct diff_options *options,
void *data)
{
int i;
for (i = 0; i < q->nr; i++) {
struct diff_filepair *p = q->queue[i];
if (!S_ISGITLINK(p->two->mode))
continue;

if (S_ISGITLINK(p->one->mode)) {
/* NEEDSWORK: We should honor the name configured in
* the .gitmodules file of the commit we are examining
* here to be able to correctly follow submodules
* being moved around. */
struct string_list_item *path;
path = unsorted_string_list_lookup(&changed_submodule_paths, p->two->path);
if (!path && !is_submodule_commit_present(p->two->path, p->two->sha1))
string_list_append(&changed_submodule_paths, xstrdup(p->two->path));
} else {
/* Submodule is new or was moved here */
/* NEEDSWORK: When the .git directories of submodules
* live inside the superprojects .git directory some
* day we should fetch new submodules directly into
* that location too when config or options request
* that so they can be checked out from there. */
continue;
}
}
}

static int add_sha1_to_array(const char *ref, const unsigned char *sha1,
int flags, void *data)
{
sha1_array_append(data, sha1);
return 0;
}

void check_for_new_submodule_commits(unsigned char new_sha1[20])
{
if (!initialized_fetch_ref_tips) {
for_each_ref(add_sha1_to_array, &ref_tips_before_fetch);
initialized_fetch_ref_tips = 1;
}

sha1_array_append(&ref_tips_after_fetch, new_sha1);
}

static void add_sha1_to_argv(const unsigned char sha1[20], void *data)
{
argv_array_push(data, sha1_to_hex(sha1));
}

static void calculate_changed_submodule_paths(void)
{
struct rev_info rev;
struct commit *commit;
struct argv_array argv = ARGV_ARRAY_INIT;

/* No need to check if there are no submodules configured */
if (!config_name_for_path.nr)
return;

init_revisions(&rev, NULL);
argv_array_push(&argv, "--"); /* argv[0] program name */
sha1_array_for_each_unique(&ref_tips_after_fetch,
add_sha1_to_argv, &argv);
argv_array_push(&argv, "--not");
sha1_array_for_each_unique(&ref_tips_before_fetch,
add_sha1_to_argv, &argv);
setup_revisions(argv.argc, argv.argv, &rev, NULL);
if (prepare_revision_walk(&rev))
die("revision walk setup failed");

/*
* Collect all submodules (whether checked out or not) for which new
* commits have been recorded upstream in "changed_submodule_paths".
*/
while ((commit = get_revision(&rev))) {
struct commit_list *parent = commit->parents;
while (parent) {
struct diff_options diff_opts;
diff_setup(&diff_opts);
DIFF_OPT_SET(&diff_opts, RECURSIVE);
diff_opts.output_format |= DIFF_FORMAT_CALLBACK;
diff_opts.format_callback = submodule_collect_changed_cb;
if (diff_setup_done(&diff_opts) < 0)
die("diff_setup_done failed");
diff_tree_sha1(parent->item->object.sha1, commit->object.sha1, "", &diff_opts);
diffcore_std(&diff_opts);
diff_flush(&diff_opts);
parent = parent->next;
}
}

argv_array_clear(&argv);
sha1_array_clear(&ref_tips_before_fetch);
sha1_array_clear(&ref_tips_after_fetch);
initialized_fetch_ref_tips = 0;
}

int fetch_populated_submodules(int num_options, const char **options,
const char *prefix, int command_line_option,
int quiet)
{
int i, result = 0, argc = 0, default_argc;
struct child_process cp;
const char **argv;
struct string_list_item *name_for_path;
const char *work_tree = get_git_work_tree();
if (!work_tree)
goto out;

if (!the_index.initialized)
if (read_cache() < 0)
die("index file corrupt");

/* 6: "fetch" (options) --recurse-submodules-default default "--submodule-prefix" prefix NULL */
argv = xcalloc(num_options + 6, sizeof(const char *));
argv[argc++] = "fetch";
for (i = 0; i < num_options; i++)
argv[argc++] = options[i];
argv[argc++] = "--recurse-submodules-default";
default_argc = argc++;
argv[argc++] = "--submodule-prefix";

memset(&cp, 0, sizeof(cp));
cp.argv = argv;
cp.env = local_repo_env;
cp.git_cmd = 1;
cp.no_stdin = 1;

calculate_changed_submodule_paths();

for (i = 0; i < active_nr; i++) {
struct strbuf submodule_path = STRBUF_INIT;
struct strbuf submodule_git_dir = STRBUF_INIT;
struct strbuf submodule_prefix = STRBUF_INIT;
struct cache_entry *ce = active_cache[i];
const char *git_dir, *name, *default_argv;

if (!S_ISGITLINK(ce->ce_mode))
continue;

name = ce->name;
name_for_path = unsorted_string_list_lookup(&config_name_for_path, ce->name);
if (name_for_path)
name = name_for_path->util;

default_argv = "yes";
if (command_line_option == RECURSE_SUBMODULES_DEFAULT) {
struct string_list_item *fetch_recurse_submodules_option;
fetch_recurse_submodules_option = unsorted_string_list_lookup(&config_fetch_recurse_submodules_for_name, name);
if (fetch_recurse_submodules_option) {
if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_OFF)
continue;
if ((intptr_t)fetch_recurse_submodules_option->util == RECURSE_SUBMODULES_ON_DEMAND) {
if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
continue;
default_argv = "on-demand";
}
} else {
if ((config_fetch_recurse_submodules == RECURSE_SUBMODULES_OFF) ||
gitmodules_is_unmerged)
continue;
if (config_fetch_recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND) {
if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
continue;
default_argv = "on-demand";
}
}
} else if (command_line_option == RECURSE_SUBMODULES_ON_DEMAND) {
if (!unsorted_string_list_lookup(&changed_submodule_paths, ce->name))
continue;
default_argv = "on-demand";
}

strbuf_addf(&submodule_path, "%s/%s", work_tree, ce->name);
strbuf_addf(&submodule_git_dir, "%s/.git", submodule_path.buf);
strbuf_addf(&submodule_prefix, "%s%s/", prefix, ce->name);
git_dir = read_gitfile(submodule_git_dir.buf);
if (!git_dir)
git_dir = submodule_git_dir.buf;
if (is_directory(git_dir)) {
if (!quiet)
printf("Fetching submodule %s%s\n", prefix, ce->name);
cp.dir = submodule_path.buf;
argv[default_argc] = default_argv;
argv[argc] = submodule_prefix.buf;
if (run_command(&cp))
result = 1;
}
strbuf_release(&submodule_path);
strbuf_release(&submodule_git_dir);
strbuf_release(&submodule_prefix);
}
free(argv);
out:
string_list_clear(&changed_submodule_paths, 1);
return result;
}

unsigned is_submodule_modified(const char *path, int ignore_untracked)
{
ssize_t len;
struct child_process cp;
const char *argv[] = {
"status",
"--porcelain",
NULL,
NULL,
};
struct strbuf buf = STRBUF_INIT;
unsigned dirty_submodule = 0;
const char *line, *next_line;
const char *git_dir;

strbuf_addf(&buf, "%s/.git", path);
git_dir = read_gitfile(buf.buf);
if (!git_dir)
git_dir = buf.buf;
if (!is_directory(git_dir)) {
strbuf_release(&buf);
/* The submodule is not checked out, so it is not modified */
return 0;

}
strbuf_reset(&buf);

if (ignore_untracked)
argv[2] = "-uno";

memset(&cp, 0, sizeof(cp));
cp.argv = argv;
cp.env = local_repo_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' in submodule %s", path);

len = strbuf_read(&buf, cp.out, 1024);
line = buf.buf;
while (len > 2) {
if ((line[0] == '?') && (line[1] == '?')) {
dirty_submodule |= DIRTY_SUBMODULE_UNTRACKED;
if (dirty_submodule & DIRTY_SUBMODULE_MODIFIED)
break;
} else {
dirty_submodule |= DIRTY_SUBMODULE_MODIFIED;
if (ignore_untracked ||
(dirty_submodule & DIRTY_SUBMODULE_UNTRACKED))
break;
}
next_line = strchr(line, '\n');
if (!next_line)
break;
next_line++;
len -= (next_line - line);
line = next_line;
}
close(cp.out);

if (finish_command(&cp))
die("'git status --porcelain' failed in submodule %s", path);

strbuf_release(&buf);
return dirty_submodule;
}

static int find_first_merges(struct object_array *result, const char *path,
struct commit *a, struct commit *b)
{
int i, j;
struct object_array merges;
struct commit *commit;
int contains_another;

char merged_revision[42];
const char *rev_args[] = { "rev-list", "--merges", "--ancestry-path",
"--all", merged_revision, NULL };
struct rev_info revs;
struct setup_revision_opt rev_opts;

memset(&merges, 0, sizeof(merges));
memset(result, 0, sizeof(struct object_array));
memset(&rev_opts, 0, sizeof(rev_opts));

/* get all revisions that merge commit a */
snprintf(merged_revision, sizeof(merged_revision), "^%s",
sha1_to_hex(a->object.sha1));
init_revisions(&revs, NULL);
rev_opts.submodule = path;
setup_revisions(sizeof(rev_args)/sizeof(char *)-1, rev_args, &revs, &rev_opts);

/* save all revisions from the above list that contain b */
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
while ((commit = get_revision(&revs)) != NULL) {
struct object *o = &(commit->object);
if (in_merge_bases(b, &commit, 1))
add_object_array(o, NULL, &merges);
}
reset_revision_walk();

/* Now we've got all merges that contain a and b. Prune all
* merges that contain another found merge and save them in
* result.
*/
for (i = 0; i < merges.nr; i++) {
struct commit *m1 = (struct commit *) merges.objects[i].item;

contains_another = 0;
for (j = 0; j < merges.nr; j++) {
struct commit *m2 = (struct commit *) merges.objects[j].item;
if (i != j && in_merge_bases(m2, &m1, 1)) {
contains_another = 1;
break;
}
}

if (!contains_another)
add_object_array(merges.objects[i].item,
merges.objects[i].name, result);
}

free(merges.objects);
return result->nr;
}

static void print_commit(struct commit *commit)
{
struct strbuf sb = STRBUF_INIT;
struct pretty_print_context ctx = {0};
ctx.date_mode = DATE_NORMAL;
format_commit_message(commit, " %h: %m %s", &sb, &ctx);
fprintf(stderr, "%s\n", sb.buf);
strbuf_release(&sb);
}

#define MERGE_WARNING(path, msg) \
warning("Failed to merge submodule %s (%s)", path, msg);

int merge_submodule(unsigned char result[20], const char *path,
const unsigned char base[20], const unsigned char a[20],
const unsigned char b[20], int search)
{
struct commit *commit_base, *commit_a, *commit_b;
int parent_count;
struct object_array merges;

int i;

/* store a in result in case we fail */
hashcpy(result, a);

/* we can not handle deletion conflicts */
if (is_null_sha1(base))
return 0;
if (is_null_sha1(a))
return 0;
if (is_null_sha1(b))
return 0;

if (add_submodule_odb(path)) {
MERGE_WARNING(path, "not checked out");
return 0;
}

if (!(commit_base = lookup_commit_reference(base)) ||
!(commit_a = lookup_commit_reference(a)) ||
!(commit_b = lookup_commit_reference(b))) {
MERGE_WARNING(path, "commits not present");
return 0;
}

/* check whether both changes are forward */
if (!in_merge_bases(commit_base, &commit_a, 1) ||
!in_merge_bases(commit_base, &commit_b, 1)) {
MERGE_WARNING(path, "commits don't follow merge-base");
return 0;
}

/* Case #1: a is contained in b or vice versa */
if (in_merge_bases(commit_a, &commit_b, 1)) {
hashcpy(result, b);
return 1;
}
if (in_merge_bases(commit_b, &commit_a, 1)) {
hashcpy(result, a);
return 1;
}

/*
* Case #2: There are one or more merges that contain a and b in
* the submodule. If there is only one, then present it as a
* suggestion to the user, but leave it marked unmerged so the
* user needs to confirm the resolution.
*/

/* Skip the search if makes no sense to the calling context. */
if (!search)
return 0;

/* find commit which merges them */
parent_count = find_first_merges(&merges, path, commit_a, commit_b);
switch (parent_count) {
case 0:
MERGE_WARNING(path, "merge following commits not found");
break;

case 1:
MERGE_WARNING(path, "not fast-forward");
fprintf(stderr, "Found a possible merge resolution "
"for the submodule:\n");
print_commit((struct commit *) merges.objects[0].item);
fprintf(stderr,
"If this is correct simply add it to the index "
"for example\n"
"by using:\n\n"
" git update-index --cacheinfo 160000 %s \"%s\"\n\n"
"which will accept this suggestion.\n",
sha1_to_hex(merges.objects[0].item->sha1), path);
break;

default:
MERGE_WARNING(path, "multiple merges found");
for (i = 0; i < merges.nr; i++)
print_commit((struct commit *) merges.objects[i].item);
}

free(merges.objects);
return 0;
}
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