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/*
* "git fetch"
*/
#include "cache.h"
#include "refs.h"
#include "commit.h"
#include "builtin.h"
#include "string-list.h"
#include "remote.h"
#include "transport.h"
#include "run-command.h"
#include "parse-options.h"
#include "sigchain.h"
#include "transport.h"
#include "submodule.h"
#include "connected.h"

static const char * const builtin_fetch_usage[] = {
"git fetch [<options>] [<repository> [<refspec>...]]",
"git fetch [<options>] <group>",
"git fetch --multiple [<options>] [(<repository> | <group>)...]",
"git fetch --all [<options>]",
NULL
};

enum {
TAGS_UNSET = 0,
TAGS_DEFAULT = 1,
TAGS_SET = 2
};

static int all, append, dry_run, force, keep, multiple, prune, update_head_ok, verbosity;
static int progress = -1, recurse_submodules = RECURSE_SUBMODULES_DEFAULT;
static int tags = TAGS_DEFAULT;
static const char *depth;
static const char *upload_pack;
static struct strbuf default_rla = STRBUF_INIT;
static struct transport *transport;
static const char *submodule_prefix = "";
static const char *recurse_submodules_default;

static int option_parse_recurse_submodules(const struct option *opt,
const char *arg, int unset)
{
if (unset) {
recurse_submodules = RECURSE_SUBMODULES_OFF;
} else {
if (arg)
recurse_submodules = parse_fetch_recurse_submodules_arg(opt->long_name, arg);
else
recurse_submodules = RECURSE_SUBMODULES_ON;
}
return 0;
}

static struct option builtin_fetch_options[] = {
OPT__VERBOSITY(&verbosity),
OPT_BOOLEAN(0, "all", &all,
"fetch from all remotes"),
OPT_BOOLEAN('a', "append", &append,
"append to .git/FETCH_HEAD instead of overwriting"),
OPT_STRING(0, "upload-pack", &upload_pack, "path",
"path to upload pack on remote end"),
OPT__FORCE(&force, "force overwrite of local branch"),
OPT_BOOLEAN('m', "multiple", &multiple,
"fetch from multiple remotes"),
OPT_SET_INT('t', "tags", &tags,
"fetch all tags and associated objects", TAGS_SET),
OPT_SET_INT('n', NULL, &tags,
"do not fetch all tags (--no-tags)", TAGS_UNSET),
OPT_BOOLEAN('p', "prune", &prune,
"prune remote-tracking branches no longer on remote"),
{ OPTION_CALLBACK, 0, "recurse-submodules", NULL, "on-demand",
"control recursive fetching of submodules",
PARSE_OPT_OPTARG, option_parse_recurse_submodules },
OPT_BOOLEAN(0, "dry-run", &dry_run,
"dry run"),
OPT_BOOLEAN('k', "keep", &keep, "keep downloaded pack"),
OPT_BOOLEAN('u', "update-head-ok", &update_head_ok,
"allow updating of HEAD ref"),
OPT_BOOL(0, "progress", &progress, "force progress reporting"),
OPT_STRING(0, "depth", &depth, "depth",
"deepen history of shallow clone"),
{ OPTION_STRING, 0, "submodule-prefix", &submodule_prefix, "dir",
"prepend this to submodule path output", PARSE_OPT_HIDDEN },
{ OPTION_STRING, 0, "recurse-submodules-default",
&recurse_submodules_default, NULL,
"default mode for recursion", PARSE_OPT_HIDDEN },
OPT_END()
};

static void unlock_pack(void)
{
if (transport)
transport_unlock_pack(transport);
}

static void unlock_pack_on_signal(int signo)
{
unlock_pack();
sigchain_pop(signo);
raise(signo);
}

static void add_merge_config(struct ref **head,
const struct ref *remote_refs,
struct branch *branch,
struct ref ***tail)
{
int i;

for (i = 0; i < branch->merge_nr; i++) {
struct ref *rm, **old_tail = *tail;
struct refspec refspec;

for (rm = *head; rm; rm = rm->next) {
if (branch_merge_matches(branch, i, rm->name)) {
rm->merge = 1;
break;
}
}
if (rm)
continue;

/*
* Not fetched to a remote-tracking branch? We need to fetch
* it anyway to allow this branch's "branch.$name.merge"
* to be honored by 'git pull', but we do not have to
* fail if branch.$name.merge is misconfigured to point
* at a nonexisting branch. If we were indeed called by
* 'git pull', it will notice the misconfiguration because
* there is no entry in the resulting FETCH_HEAD marked
* for merging.
*/
memset(&refspec, 0, sizeof(refspec));
refspec.src = branch->merge[i]->src;
get_fetch_map(remote_refs, &refspec, tail, 1);
for (rm = *old_tail; rm; rm = rm->next)
rm->merge = 1;
}
}

static void find_non_local_tags(struct transport *transport,
struct ref **head,
struct ref ***tail);

static struct ref *get_ref_map(struct transport *transport,
struct refspec *refs, int ref_count, int tags,
int *autotags)
{
int i;
struct ref *rm;
struct ref *ref_map = NULL;
struct ref **tail = &ref_map;

const struct ref *remote_refs = transport_get_remote_refs(transport);

if (ref_count || tags == TAGS_SET) {
for (i = 0; i < ref_count; i++) {
get_fetch_map(remote_refs, &refs[i], &tail, 0);
if (refs[i].dst && refs[i].dst[0])
*autotags = 1;
}
/* Merge everything on the command line, but not --tags */
for (rm = ref_map; rm; rm = rm->next)
rm->merge = 1;
if (tags == TAGS_SET)
get_fetch_map(remote_refs, tag_refspec, &tail, 0);
} else {
/* Use the defaults */
struct remote *remote = transport->remote;
struct branch *branch = branch_get(NULL);
int has_merge = branch_has_merge_config(branch);
if (remote &&
(remote->fetch_refspec_nr ||
/* Note: has_merge implies non-NULL branch->remote_name */
(has_merge && !strcmp(branch->remote_name, remote->name)))) {
for (i = 0; i < remote->fetch_refspec_nr; i++) {
get_fetch_map(remote_refs, &remote->fetch[i], &tail, 0);
if (remote->fetch[i].dst &&
remote->fetch[i].dst[0])
*autotags = 1;
if (!i && !has_merge && ref_map &&
!remote->fetch[0].pattern)
ref_map->merge = 1;
}
/*
* if the remote we're fetching from is the same
* as given in branch.<name>.remote, we add the
* ref given in branch.<name>.merge, too.
*
* Note: has_merge implies non-NULL branch->remote_name
*/
if (has_merge &&
!strcmp(branch->remote_name, remote->name))
add_merge_config(&ref_map, remote_refs, branch, &tail);
} else {
ref_map = get_remote_ref(remote_refs, "HEAD");
if (!ref_map)
die(_("Couldn't find remote ref HEAD"));
ref_map->merge = 1;
tail = &ref_map->next;
}
}
if (tags == TAGS_DEFAULT && *autotags)
find_non_local_tags(transport, &ref_map, &tail);
ref_remove_duplicates(ref_map);

return ref_map;
}

#define STORE_REF_ERROR_OTHER 1
#define STORE_REF_ERROR_DF_CONFLICT 2

static int s_update_ref(const char *action,
struct ref *ref,
int check_old)
{
char msg[1024];
char *rla = getenv("GIT_REFLOG_ACTION");
static struct ref_lock *lock;

if (dry_run)
return 0;
if (!rla)
rla = default_rla.buf;
snprintf(msg, sizeof(msg), "%s: %s", rla, action);
lock = lock_any_ref_for_update(ref->name,
check_old ? ref->old_sha1 : NULL, 0);
if (!lock)
return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
STORE_REF_ERROR_OTHER;
if (write_ref_sha1(lock, ref->new_sha1, msg) < 0)
return errno == ENOTDIR ? STORE_REF_ERROR_DF_CONFLICT :
STORE_REF_ERROR_OTHER;
return 0;
}

#define REFCOL_WIDTH 10

static int update_local_ref(struct ref *ref,
const char *remote,
const struct ref *remote_ref,
struct strbuf *display)
{
struct commit *current = NULL, *updated;
enum object_type type;
struct branch *current_branch = branch_get(NULL);
const char *pretty_ref = prettify_refname(ref->name);

type = sha1_object_info(ref->new_sha1, NULL);
if (type < 0)
die(_("object %s not found"), sha1_to_hex(ref->new_sha1));

if (!hashcmp(ref->old_sha1, ref->new_sha1)) {
if (verbosity > 0)
strbuf_addf(display, "= %-*s %-*s -> %s",
TRANSPORT_SUMMARY_WIDTH,
_("[up to date]"), REFCOL_WIDTH,
remote, pretty_ref);
return 0;
}

if (current_branch &&
!strcmp(ref->name, current_branch->name) &&
!(update_head_ok || is_bare_repository()) &&
!is_null_sha1(ref->old_sha1)) {
/*
* If this is the head, and it's not okay to update
* the head, and the old value of the head isn't empty...
*/
strbuf_addf(display,
_("! %-*s %-*s -> %s (can't fetch in current branch)"),
TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
REFCOL_WIDTH, remote, pretty_ref);
return 1;
}

if (!is_null_sha1(ref->old_sha1) &&
!prefixcmp(ref->name, "refs/tags/")) {
int r;
r = s_update_ref("updating tag", ref, 0);
strbuf_addf(display, "%c %-*s %-*s -> %s%s",
r ? '!' : '-',
TRANSPORT_SUMMARY_WIDTH, _("[tag update]"),
REFCOL_WIDTH, remote, pretty_ref,
r ? _(" (unable to update local ref)") : "");
return r;
}

current = lookup_commit_reference_gently(ref->old_sha1, 1);
updated = lookup_commit_reference_gently(ref->new_sha1, 1);
if (!current || !updated) {
const char *msg;
const char *what;
int r;
/*
* Nicely describe the new ref we're fetching.
* Base this on the remote's ref name, as it's
* more likely to follow a standard layout.
*/
const char *name = remote_ref ? remote_ref->name : "";
if (!prefixcmp(name, "refs/tags/")) {
msg = "storing tag";
what = _("[new tag]");
} else if (!prefixcmp(name, "refs/heads/")) {
msg = "storing head";
what = _("[new branch]");
} else {
msg = "storing ref";
what = _("[new ref]");
}

if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
(recurse_submodules != RECURSE_SUBMODULES_ON))
check_for_new_submodule_commits(ref->new_sha1);
r = s_update_ref(msg, ref, 0);
strbuf_addf(display, "%c %-*s %-*s -> %s%s",
r ? '!' : '*',
TRANSPORT_SUMMARY_WIDTH, what,
REFCOL_WIDTH, remote, pretty_ref,
r ? _(" (unable to update local ref)") : "");
return r;
}

if (in_merge_bases(current, &updated, 1)) {
char quickref[83];
int r;
strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
strcat(quickref, "..");
strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
(recurse_submodules != RECURSE_SUBMODULES_ON))
check_for_new_submodule_commits(ref->new_sha1);
r = s_update_ref("fast-forward", ref, 1);
strbuf_addf(display, "%c %-*s %-*s -> %s%s",
r ? '!' : ' ',
TRANSPORT_SUMMARY_WIDTH, quickref,
REFCOL_WIDTH, remote, pretty_ref,
r ? _(" (unable to update local ref)") : "");
return r;
} else if (force || ref->force) {
char quickref[84];
int r;
strcpy(quickref, find_unique_abbrev(current->object.sha1, DEFAULT_ABBREV));
strcat(quickref, "...");
strcat(quickref, find_unique_abbrev(ref->new_sha1, DEFAULT_ABBREV));
if ((recurse_submodules != RECURSE_SUBMODULES_OFF) &&
(recurse_submodules != RECURSE_SUBMODULES_ON))
check_for_new_submodule_commits(ref->new_sha1);
r = s_update_ref("forced-update", ref, 1);
strbuf_addf(display, "%c %-*s %-*s -> %s (%s)",
r ? '!' : '+',
TRANSPORT_SUMMARY_WIDTH, quickref,
REFCOL_WIDTH, remote, pretty_ref,
r ? _("unable to update local ref") : _("forced update"));
return r;
} else {
strbuf_addf(display, "! %-*s %-*s -> %s %s",
TRANSPORT_SUMMARY_WIDTH, _("[rejected]"),
REFCOL_WIDTH, remote, pretty_ref,
_("(non-fast-forward)"));
return 1;
}
}

static int iterate_ref_map(void *cb_data, unsigned char sha1[20])
{
struct ref **rm = cb_data;
struct ref *ref = *rm;

if (!ref)
return -1; /* end of the list */
*rm = ref->next;
hashcpy(sha1, ref->old_sha1);
return 0;
}

static int store_updated_refs(const char *raw_url, const char *remote_name,
struct ref *ref_map)
{
FILE *fp;
struct commit *commit;
int url_len, i, shown_url = 0, rc = 0;
struct strbuf note = STRBUF_INIT;
const char *what, *kind;
struct ref *rm;
char *url, *filename = dry_run ? "/dev/null" : git_path("FETCH_HEAD");
int want_merge;

fp = fopen(filename, "a");
if (!fp)
return error(_("cannot open %s: %s\n"), filename, strerror(errno));

if (raw_url)
url = transport_anonymize_url(raw_url);
else
url = xstrdup("foreign");

rm = ref_map;
if (check_everything_connected(iterate_ref_map, 0, &rm)) {
rc = error(_("%s did not send all necessary objects\n"), url);
goto abort;
}

/*
* The first pass writes objects to be merged and then the
* second pass writes the rest, in order to allow using
* FETCH_HEAD as a refname to refer to the ref to be merged.
*/
for (want_merge = 1; 0 <= want_merge; want_merge--) {
for (rm = ref_map; rm; rm = rm->next) {
struct ref *ref = NULL;

commit = lookup_commit_reference_gently(rm->old_sha1, 1);
if (!commit)
rm->merge = 0;

if (rm->merge != want_merge)
continue;

if (rm->peer_ref) {
ref = xcalloc(1, sizeof(*ref) + strlen(rm->peer_ref->name) + 1);
strcpy(ref->name, rm->peer_ref->name);
hashcpy(ref->old_sha1, rm->peer_ref->old_sha1);
hashcpy(ref->new_sha1, rm->old_sha1);
ref->force = rm->peer_ref->force;
}


if (!strcmp(rm->name, "HEAD")) {
kind = "";
what = "";
}
else if (!prefixcmp(rm->name, "refs/heads/")) {
kind = "branch";
what = rm->name + 11;
}
else if (!prefixcmp(rm->name, "refs/tags/")) {
kind = "tag";
what = rm->name + 10;
}
else if (!prefixcmp(rm->name, "refs/remotes/")) {
kind = "remote-tracking branch";
what = rm->name + 13;
}
else {
kind = "";
what = rm->name;
}

url_len = strlen(url);
for (i = url_len - 1; url[i] == '/' && 0 <= i; i--)
;
url_len = i + 1;
if (4 < i && !strncmp(".git", url + i - 3, 4))
url_len = i - 3;

strbuf_reset(&note);
if (*what) {
if (*kind)
strbuf_addf(&note, "%s ", kind);
strbuf_addf(&note, "'%s' of ", what);
}
fprintf(fp, "%s\t%s\t%s",
sha1_to_hex(rm->old_sha1),
rm->merge ? "" : "not-for-merge",
note.buf);
for (i = 0; i < url_len; ++i)
if ('\n' == url[i])
fputs("\\n", fp);
else
fputc(url[i], fp);
fputc('\n', fp);

strbuf_reset(&note);
if (ref) {
rc |= update_local_ref(ref, what, rm, &note);
free(ref);
} else
strbuf_addf(&note, "* %-*s %-*s -> FETCH_HEAD",
TRANSPORT_SUMMARY_WIDTH,
*kind ? kind : "branch",
REFCOL_WIDTH,
*what ? what : "HEAD");
if (note.len) {
if (verbosity >= 0 && !shown_url) {
fprintf(stderr, _("From %.*s\n"),
url_len, url);
shown_url = 1;
}
if (verbosity >= 0)
fprintf(stderr, " %s\n", note.buf);
}
}
}

if (rc & STORE_REF_ERROR_DF_CONFLICT)
error(_("some local refs could not be updated; try running\n"
" 'git remote prune %s' to remove any old, conflicting "
"branches"), remote_name);

 abort:
strbuf_release(&note);
free(url);
fclose(fp);
return rc;
}

/*
* We would want to bypass the object transfer altogether if
* everything we are going to fetch already exists and is connected
* locally.
*/
static int quickfetch(struct ref *ref_map)
{
struct ref *rm = ref_map;

/*
* If we are deepening a shallow clone we already have these
* objects reachable. Running rev-list here will return with
* a good (0) exit status and we'll bypass the fetch that we
* really need to perform. Claiming failure now will ensure
* we perform the network exchange to deepen our history.
*/
if (depth)
return -1;
return check_everything_connected(iterate_ref_map, 1, &rm);
}

static int fetch_refs(struct transport *transport, struct ref *ref_map)
{
int ret = quickfetch(ref_map);
if (ret)
ret = transport_fetch_refs(transport, ref_map);
if (!ret)
ret |= store_updated_refs(transport->url,
transport->remote->name,
ref_map);
transport_unlock_pack(transport);
return ret;
}

static int prune_refs(struct refspec *refs, int ref_count, struct ref *ref_map)
{
int result = 0;
struct ref *ref, *stale_refs = get_stale_heads(refs, ref_count, ref_map);
const char *dangling_msg = dry_run
? _(" (%s will become dangling)")
: _(" (%s has become dangling)");

for (ref = stale_refs; ref; ref = ref->next) {
if (!dry_run)
result |= delete_ref(ref->name, NULL, 0);
if (verbosity >= 0) {
fprintf(stderr, " x %-*s %-*s -> %s\n",
TRANSPORT_SUMMARY_WIDTH, _("[deleted]"),
REFCOL_WIDTH, _("(none)"), prettify_refname(ref->name));
warn_dangling_symref(stderr, dangling_msg, ref->name);
}
}
free_refs(stale_refs);
return result;
}

static int add_existing(const char *refname, const unsigned char *sha1,
int flag, void *cbdata)
{
struct string_list *list = (struct string_list *)cbdata;
struct string_list_item *item = string_list_insert(list, refname);
item->util = (void *)sha1;
return 0;
}

static int will_fetch(struct ref **head, const unsigned char *sha1)
{
struct ref *rm = *head;
while (rm) {
if (!hashcmp(rm->old_sha1, sha1))
return 1;
rm = rm->next;
}
return 0;
}

static void find_non_local_tags(struct transport *transport,
struct ref **head,
struct ref ***tail)
{
struct string_list existing_refs = STRING_LIST_INIT_NODUP;
struct string_list remote_refs = STRING_LIST_INIT_NODUP;
const struct ref *ref;
struct string_list_item *item = NULL;

for_each_ref(add_existing, &existing_refs);
for (ref = transport_get_remote_refs(transport); ref; ref = ref->next) {
if (prefixcmp(ref->name, "refs/tags/"))
continue;

/*
* The peeled ref always follows the matching base
* ref, so if we see a peeled ref that we don't want
* to fetch then we can mark the ref entry in the list
* as one to ignore by setting util to NULL.
*/
if (!suffixcmp(ref->name, "^{}")) {
if (item && !has_sha1_file(ref->old_sha1) &&
!will_fetch(head, ref->old_sha1) &&
!has_sha1_file(item->util) &&
!will_fetch(head, item->util))
item->util = NULL;
item = NULL;
continue;
}

/*
* If item is non-NULL here, then we previously saw a
* ref not followed by a peeled reference, so we need
* to check if it is a lightweight tag that we want to
* fetch.
*/
if (item && !has_sha1_file(item->util) &&
!will_fetch(head, item->util))
item->util = NULL;

item = NULL;

/* skip duplicates and refs that we already have */
if (string_list_has_string(&remote_refs, ref->name) ||
string_list_has_string(&existing_refs, ref->name))
continue;

item = string_list_insert(&remote_refs, ref->name);
item->util = (void *)ref->old_sha1;
}
string_list_clear(&existing_refs, 0);

/*
* We may have a final lightweight tag that needs to be
* checked to see if it needs fetching.
*/
if (item && !has_sha1_file(item->util) &&
!will_fetch(head, item->util))
item->util = NULL;

/*
* For all the tags in the remote_refs string list,
* add them to the list of refs to be fetched
*/
for_each_string_list_item(item, &remote_refs) {
/* Unless we have already decided to ignore this item... */
if (item->util)
{
struct ref *rm = alloc_ref(item->string);
rm->peer_ref = alloc_ref(item->string);
hashcpy(rm->old_sha1, item->util);
**tail = rm;
*tail = &rm->next;
}
}

string_list_clear(&remote_refs, 0);
}

static void check_not_current_branch(struct ref *ref_map)
{
struct branch *current_branch = branch_get(NULL);

if (is_bare_repository() || !current_branch)
return;

for (; ref_map; ref_map = ref_map->next)
if (ref_map->peer_ref && !strcmp(current_branch->refname,
ref_map->peer_ref->name))
die(_("Refusing to fetch into current branch %s "
"of non-bare repository"), current_branch->refname);
}

static int truncate_fetch_head(void)
{
char *filename = git_path("FETCH_HEAD");
FILE *fp = fopen(filename, "w");

if (!fp)
return error(_("cannot open %s: %s\n"), filename, strerror(errno));
fclose(fp);
return 0;
}

static int do_fetch(struct transport *transport,
struct refspec *refs, int ref_count)
{
struct string_list existing_refs = STRING_LIST_INIT_NODUP;
struct string_list_item *peer_item = NULL;
struct ref *ref_map;
struct ref *rm;
int autotags = (transport->remote->fetch_tags == 1);

for_each_ref(add_existing, &existing_refs);

if (tags == TAGS_DEFAULT) {
if (transport->remote->fetch_tags == 2)
tags = TAGS_SET;
if (transport->remote->fetch_tags == -1)
tags = TAGS_UNSET;
}

if (!transport->get_refs_list || !transport->fetch)
die(_("Don't know how to fetch from %s"), transport->url);

/* if not appending, truncate FETCH_HEAD */
if (!append && !dry_run) {
int errcode = truncate_fetch_head();
if (errcode)
return errcode;
}

ref_map = get_ref_map(transport, refs, ref_count, tags, &autotags);
if (!update_head_ok)
check_not_current_branch(ref_map);

for (rm = ref_map; rm; rm = rm->next) {
if (rm->peer_ref) {
peer_item = string_list_lookup(&existing_refs,
rm->peer_ref->name);
if (peer_item)
hashcpy(rm->peer_ref->old_sha1,
peer_item->util);
}
}

if (tags == TAGS_DEFAULT && autotags)
transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, "1");
if (fetch_refs(transport, ref_map)) {
free_refs(ref_map);
return 1;
}
if (prune) {
/* If --tags was specified, pretend the user gave us the canonical tags refspec */
if (tags == TAGS_SET) {
const char *tags_str = "refs/tags/*:refs/tags/*";
struct refspec *tags_refspec, *refspec;

/* Copy the refspec and add the tags to it */
refspec = xcalloc(ref_count + 1, sizeof(struct refspec));
tags_refspec = parse_fetch_refspec(1, &tags_str);
memcpy(refspec, refs, ref_count * sizeof(struct refspec));
memcpy(&refspec[ref_count], tags_refspec, sizeof(struct refspec));
ref_count++;

prune_refs(refspec, ref_count, ref_map);

ref_count--;
/* The rest of the strings belong to fetch_one */
free_refspec(1, tags_refspec);
free(refspec);
} else if (ref_count) {
prune_refs(refs, ref_count, ref_map);
} else {
prune_refs(transport->remote->fetch, transport->remote->fetch_refspec_nr, ref_map);
}
}
free_refs(ref_map);

/* if neither --no-tags nor --tags was specified, do automated tag
* following ... */
if (tags == TAGS_DEFAULT && autotags) {
struct ref **tail = &ref_map;
ref_map = NULL;
find_non_local_tags(transport, &ref_map, &tail);
if (ref_map) {
transport_set_option(transport, TRANS_OPT_FOLLOWTAGS, NULL);
transport_set_option(transport, TRANS_OPT_DEPTH, "0");
fetch_refs(transport, ref_map);
}
free_refs(ref_map);
}

return 0;
}

static void set_option(const char *name, const char *value)
{
int r = transport_set_option(transport, name, value);
if (r < 0)
die(_("Option \"%s\" value \"%s\" is not valid for %s"),
name, value, transport->url);
if (r > 0)
warning(_("Option \"%s\" is ignored for %s\n"),
name, transport->url);
}

static int get_one_remote_for_fetch(struct remote *remote, void *priv)
{
struct string_list *list = priv;
if (!remote->skip_default_update)
string_list_append(list, remote->name);
return 0;
}

struct remote_group_data {
const char *name;
struct string_list *list;
};

static int get_remote_group(const char *key, const char *value, void *priv)
{
struct remote_group_data *g = priv;

if (!prefixcmp(key, "remotes.") &&
!strcmp(key + 8, g->name)) {
/* split list by white space */
int space = strcspn(value, " \t\n");
while (*value) {
if (space > 1) {
string_list_append(g->list,
xstrndup(value, space));
}
value += space + (value[space] != '\0');
space = strcspn(value, " \t\n");
}
}

return 0;
}

static int add_remote_or_group(const char *name, struct string_list *list)
{
int prev_nr = list->nr;
struct remote_group_data g;
g.name = name; g.list = list;

git_config(get_remote_group, &g);
if (list->nr == prev_nr) {
struct remote *remote;
if (!remote_is_configured(name))
return 0;
remote = remote_get(name);
string_list_append(list, remote->name);
}
return 1;
}

static void add_options_to_argv(int *argc, const char **argv)
{
if (dry_run)
argv[(*argc)++] = "--dry-run";
if (prune)
argv[(*argc)++] = "--prune";
if (update_head_ok)
argv[(*argc)++] = "--update-head-ok";
if (force)
argv[(*argc)++] = "--force";
if (keep)
argv[(*argc)++] = "--keep";
if (recurse_submodules == RECURSE_SUBMODULES_ON)
argv[(*argc)++] = "--recurse-submodules";
else if (recurse_submodules == RECURSE_SUBMODULES_ON_DEMAND)
argv[(*argc)++] = "--recurse-submodules=on-demand";
if (verbosity >= 2)
argv[(*argc)++] = "-v";
if (verbosity >= 1)
argv[(*argc)++] = "-v";
else if (verbosity < 0)
argv[(*argc)++] = "-q";

}

static int fetch_multiple(struct string_list *list)
{
int i, result = 0;
const char *argv[12] = { "fetch", "--append" };
int argc = 2;

add_options_to_argv(&argc, argv);

if (!append && !dry_run) {
int errcode = truncate_fetch_head();
if (errcode)
return errcode;
}

for (i = 0; i < list->nr; i++) {
const char *name = list->items[i].string;
argv[argc] = name;
argv[argc + 1] = NULL;
if (verbosity >= 0)
printf(_("Fetching %s\n"), name);
if (run_command_v_opt(argv, RUN_GIT_CMD)) {
error(_("Could not fetch %s"), name);
result = 1;
}
}

return result;
}

static int fetch_one(struct remote *remote, int argc, const char **argv)
{
int i;
static const char **refs = NULL;
struct refspec *refspec;
int ref_nr = 0;
int exit_code;

if (!remote)
die(_("No remote repository specified. Please, specify either a URL or a\n"
"remote name from which new revisions should be fetched."));

transport = transport_get(remote, NULL);
transport_set_verbosity(transport, verbosity, progress);
if (upload_pack)
set_option(TRANS_OPT_UPLOADPACK, upload_pack);
if (keep)
set_option(TRANS_OPT_KEEP, "yes");
if (depth)
set_option(TRANS_OPT_DEPTH, depth);

if (argc > 0) {
int j = 0;
refs = xcalloc(argc + 1, sizeof(const char *));
for (i = 0; i < argc; i++) {
if (!strcmp(argv[i], "tag")) {
char *ref;
i++;
if (i >= argc)
die(_("You need to specify a tag name."));
ref = xmalloc(strlen(argv[i]) * 2 + 22);
strcpy(ref, "refs/tags/");
strcat(ref, argv[i]);
strcat(ref, ":refs/tags/");
strcat(ref, argv[i]);
refs[j++] = ref;
} else
refs[j++] = argv[i];
}
refs[j] = NULL;
ref_nr = j;
}

sigchain_push_common(unlock_pack_on_signal);
atexit(unlock_pack);
refspec = parse_fetch_refspec(ref_nr, refs);
exit_code = do_fetch(transport, refspec, ref_nr);
free_refspec(ref_nr, refspec);
transport_disconnect(transport);
transport = NULL;
return exit_code;
}

int cmd_fetch(int argc, const char **argv, const char *prefix)
{
int i;
struct string_list list = STRING_LIST_INIT_NODUP;
struct remote *remote;
int result = 0;

packet_trace_identity("fetch");

/* Record the command line for the reflog */
strbuf_addstr(&default_rla, "fetch");
for (i = 1; i < argc; i++)
strbuf_addf(&default_rla, " %s", argv[i]);

argc = parse_options(argc, argv, prefix,
builtin_fetch_options, builtin_fetch_usage, 0);

if (recurse_submodules != RECURSE_SUBMODULES_OFF) {
if (recurse_submodules_default) {
int arg = parse_fetch_recurse_submodules_arg("--recurse-submodules-default", recurse_submodules_default);
set_config_fetch_recurse_submodules(arg);
}
gitmodules_config();
git_config(submodule_config, NULL);
}

if (all) {
if (argc == 1)
die(_("fetch --all does not take a repository argument"));
else if (argc > 1)
die(_("fetch --all does not make sense with refspecs"));
(void) for_each_remote(get_one_remote_for_fetch, &list);
result = fetch_multiple(&list);
} else if (argc == 0) {
/* No arguments -- use default remote */
remote = remote_get(NULL);
result = fetch_one(remote, argc, argv);
} else if (multiple) {
/* All arguments are assumed to be remotes or groups */
for (i = 0; i < argc; i++)
if (!add_remote_or_group(argv[i], &list))
die(_("No such remote or remote group: %s"), argv[i]);
result = fetch_multiple(&list);
} else {
/* Single remote or group */
(void) add_remote_or_group(argv[0], &list);
if (list.nr > 1) {
/* More than one remote */
if (argc > 1)
die(_("Fetching a group and specifying refspecs does not make sense"));
result = fetch_multiple(&list);
} else {
/* Zero or one remotes */
remote = remote_get(argv[0]);
result = fetch_one(remote, argc-1, argv+1);
}
}

if (!result && (recurse_submodules != RECURSE_SUBMODULES_OFF)) {
const char *options[10];
int num_options = 0;
add_options_to_argv(&num_options, options);
result = fetch_populated_submodules(num_options, options,
submodule_prefix,
recurse_submodules,
verbosity < 0);
}

/* All names were strdup()ed or strndup()ed */
list.strdup_strings = 1;
string_list_clear(&list, 0);

return result;
}
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