git/remote.c
Jeff King 50a6c8efa2 use st_add and st_mult for allocation size computation
If our size computation overflows size_t, we may allocate a
much smaller buffer than we expected and overflow it. It's
probably impossible to trigger an overflow in most of these
sites in practice, but it is easy enough convert their
additions and multiplications into overflow-checking
variants. This may be fixing real bugs, and it makes
auditing the code easier.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-02-22 14:51:09 -08:00

2376 lines
59 KiB
C

#include "cache.h"
#include "remote.h"
#include "refs.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "dir.h"
#include "tag.h"
#include "string-list.h"
#include "mergesort.h"
#include "argv-array.h"
enum map_direction { FROM_SRC, FROM_DST };
static struct refspec s_tag_refspec = {
0,
1,
0,
0,
"refs/tags/*",
"refs/tags/*"
};
const struct refspec *tag_refspec = &s_tag_refspec;
struct counted_string {
size_t len;
const char *s;
};
struct rewrite {
const char *base;
size_t baselen;
struct counted_string *instead_of;
int instead_of_nr;
int instead_of_alloc;
};
struct rewrites {
struct rewrite **rewrite;
int rewrite_alloc;
int rewrite_nr;
};
static struct remote **remotes;
static int remotes_alloc;
static int remotes_nr;
static struct hashmap remotes_hash;
static struct branch **branches;
static int branches_alloc;
static int branches_nr;
static struct branch *current_branch;
static const char *pushremote_name;
static struct rewrites rewrites;
static struct rewrites rewrites_push;
static int valid_remote(const struct remote *remote)
{
return (!!remote->url) || (!!remote->foreign_vcs);
}
static const char *alias_url(const char *url, struct rewrites *r)
{
int i, j;
struct counted_string *longest;
int longest_i;
longest = NULL;
longest_i = -1;
for (i = 0; i < r->rewrite_nr; i++) {
if (!r->rewrite[i])
continue;
for (j = 0; j < r->rewrite[i]->instead_of_nr; j++) {
if (starts_with(url, r->rewrite[i]->instead_of[j].s) &&
(!longest ||
longest->len < r->rewrite[i]->instead_of[j].len)) {
longest = &(r->rewrite[i]->instead_of[j]);
longest_i = i;
}
}
}
if (!longest)
return url;
return xstrfmt("%s%s", r->rewrite[longest_i]->base, url + longest->len);
}
static void add_push_refspec(struct remote *remote, const char *ref)
{
ALLOC_GROW(remote->push_refspec,
remote->push_refspec_nr + 1,
remote->push_refspec_alloc);
remote->push_refspec[remote->push_refspec_nr++] = ref;
}
static void add_fetch_refspec(struct remote *remote, const char *ref)
{
ALLOC_GROW(remote->fetch_refspec,
remote->fetch_refspec_nr + 1,
remote->fetch_refspec_alloc);
remote->fetch_refspec[remote->fetch_refspec_nr++] = ref;
}
static void add_url(struct remote *remote, const char *url)
{
ALLOC_GROW(remote->url, remote->url_nr + 1, remote->url_alloc);
remote->url[remote->url_nr++] = url;
}
static void add_pushurl(struct remote *remote, const char *pushurl)
{
ALLOC_GROW(remote->pushurl, remote->pushurl_nr + 1, remote->pushurl_alloc);
remote->pushurl[remote->pushurl_nr++] = pushurl;
}
static void add_pushurl_alias(struct remote *remote, const char *url)
{
const char *pushurl = alias_url(url, &rewrites_push);
if (pushurl != url)
add_pushurl(remote, pushurl);
}
static void add_url_alias(struct remote *remote, const char *url)
{
add_url(remote, alias_url(url, &rewrites));
add_pushurl_alias(remote, url);
}
struct remotes_hash_key {
const char *str;
int len;
};
static int remotes_hash_cmp(const struct remote *a, const struct remote *b, const struct remotes_hash_key *key)
{
if (key)
return strncmp(a->name, key->str, key->len) || a->name[key->len];
else
return strcmp(a->name, b->name);
}
static inline void init_remotes_hash(void)
{
if (!remotes_hash.cmpfn)
hashmap_init(&remotes_hash, (hashmap_cmp_fn)remotes_hash_cmp, 0);
}
static struct remote *make_remote(const char *name, int len)
{
struct remote *ret, *replaced;
struct remotes_hash_key lookup;
struct hashmap_entry lookup_entry;
if (!len)
len = strlen(name);
init_remotes_hash();
lookup.str = name;
lookup.len = len;
hashmap_entry_init(&lookup_entry, memhash(name, len));
if ((ret = hashmap_get(&remotes_hash, &lookup_entry, &lookup)) != NULL)
return ret;
ret = xcalloc(1, sizeof(struct remote));
ret->prune = -1; /* unspecified */
ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
remotes[remotes_nr++] = ret;
ret->name = xstrndup(name, len);
hashmap_entry_init(ret, lookup_entry.hash);
replaced = hashmap_put(&remotes_hash, ret);
assert(replaced == NULL); /* no previous entry overwritten */
return ret;
}
static void add_merge(struct branch *branch, const char *name)
{
ALLOC_GROW(branch->merge_name, branch->merge_nr + 1,
branch->merge_alloc);
branch->merge_name[branch->merge_nr++] = name;
}
static struct branch *make_branch(const char *name, int len)
{
struct branch *ret;
int i;
for (i = 0; i < branches_nr; i++) {
if (len ? (!strncmp(name, branches[i]->name, len) &&
!branches[i]->name[len]) :
!strcmp(name, branches[i]->name))
return branches[i];
}
ALLOC_GROW(branches, branches_nr + 1, branches_alloc);
ret = xcalloc(1, sizeof(struct branch));
branches[branches_nr++] = ret;
if (len)
ret->name = xstrndup(name, len);
else
ret->name = xstrdup(name);
ret->refname = xstrfmt("refs/heads/%s", ret->name);
return ret;
}
static struct rewrite *make_rewrite(struct rewrites *r, const char *base, int len)
{
struct rewrite *ret;
int i;
for (i = 0; i < r->rewrite_nr; i++) {
if (len
? (len == r->rewrite[i]->baselen &&
!strncmp(base, r->rewrite[i]->base, len))
: !strcmp(base, r->rewrite[i]->base))
return r->rewrite[i];
}
ALLOC_GROW(r->rewrite, r->rewrite_nr + 1, r->rewrite_alloc);
ret = xcalloc(1, sizeof(struct rewrite));
r->rewrite[r->rewrite_nr++] = ret;
if (len) {
ret->base = xstrndup(base, len);
ret->baselen = len;
}
else {
ret->base = xstrdup(base);
ret->baselen = strlen(base);
}
return ret;
}
static void add_instead_of(struct rewrite *rewrite, const char *instead_of)
{
ALLOC_GROW(rewrite->instead_of, rewrite->instead_of_nr + 1, rewrite->instead_of_alloc);
rewrite->instead_of[rewrite->instead_of_nr].s = instead_of;
rewrite->instead_of[rewrite->instead_of_nr].len = strlen(instead_of);
rewrite->instead_of_nr++;
}
static const char *skip_spaces(const char *s)
{
while (isspace(*s))
s++;
return s;
}
static void read_remotes_file(struct remote *remote)
{
struct strbuf buf = STRBUF_INIT;
FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
if (!f)
return;
remote->origin = REMOTE_REMOTES;
while (strbuf_getline(&buf, f, '\n') != EOF) {
const char *v;
strbuf_rtrim(&buf);
if (skip_prefix(buf.buf, "URL:", &v))
add_url_alias(remote, xstrdup(skip_spaces(v)));
else if (skip_prefix(buf.buf, "Push:", &v))
add_push_refspec(remote, xstrdup(skip_spaces(v)));
else if (skip_prefix(buf.buf, "Pull:", &v))
add_fetch_refspec(remote, xstrdup(skip_spaces(v)));
}
strbuf_release(&buf);
fclose(f);
}
static void read_branches_file(struct remote *remote)
{
char *frag;
struct strbuf buf = STRBUF_INIT;
FILE *f = fopen(git_path("branches/%s", remote->name), "r");
if (!f)
return;
strbuf_getline(&buf, f, '\n');
fclose(f);
strbuf_trim(&buf);
if (!buf.len) {
strbuf_release(&buf);
return;
}
remote->origin = REMOTE_BRANCHES;
/*
* The branches file would have URL and optionally
* #branch specified. The "master" (or specified) branch is
* fetched and stored in the local branch matching the
* remote name.
*/
frag = strchr(buf.buf, '#');
if (frag)
*(frag++) = '\0';
else
frag = "master";
add_url_alias(remote, strbuf_detach(&buf, NULL));
add_fetch_refspec(remote, xstrfmt("refs/heads/%s:refs/heads/%s",
frag, remote->name));
/*
* Cogito compatible push: push current HEAD to remote #branch
* (master if missing)
*/
add_push_refspec(remote, xstrfmt("HEAD:refs/heads/%s", frag));
remote->fetch_tags = 1; /* always auto-follow */
}
static int handle_config(const char *key, const char *value, void *cb)
{
const char *name;
const char *subkey;
struct remote *remote;
struct branch *branch;
if (starts_with(key, "branch.")) {
name = key + 7;
subkey = strrchr(name, '.');
if (!subkey)
return 0;
branch = make_branch(name, subkey - name);
if (!strcmp(subkey, ".remote")) {
return git_config_string(&branch->remote_name, key, value);
} else if (!strcmp(subkey, ".pushremote")) {
return git_config_string(&branch->pushremote_name, key, value);
} else if (!strcmp(subkey, ".merge")) {
if (!value)
return config_error_nonbool(key);
add_merge(branch, xstrdup(value));
}
return 0;
}
if (starts_with(key, "url.")) {
struct rewrite *rewrite;
name = key + 4;
subkey = strrchr(name, '.');
if (!subkey)
return 0;
if (!strcmp(subkey, ".insteadof")) {
rewrite = make_rewrite(&rewrites, name, subkey - name);
if (!value)
return config_error_nonbool(key);
add_instead_of(rewrite, xstrdup(value));
} else if (!strcmp(subkey, ".pushinsteadof")) {
rewrite = make_rewrite(&rewrites_push, name, subkey - name);
if (!value)
return config_error_nonbool(key);
add_instead_of(rewrite, xstrdup(value));
}
}
if (!starts_with(key, "remote."))
return 0;
name = key + 7;
/* Handle remote.* variables */
if (!strcmp(name, "pushdefault"))
return git_config_string(&pushremote_name, key, value);
/* Handle remote.<name>.* variables */
if (*name == '/') {
warning("Config remote shorthand cannot begin with '/': %s",
name);
return 0;
}
subkey = strrchr(name, '.');
if (!subkey)
return 0;
remote = make_remote(name, subkey - name);
remote->origin = REMOTE_CONFIG;
if (!strcmp(subkey, ".mirror"))
remote->mirror = git_config_bool(key, value);
else if (!strcmp(subkey, ".skipdefaultupdate"))
remote->skip_default_update = git_config_bool(key, value);
else if (!strcmp(subkey, ".skipfetchall"))
remote->skip_default_update = git_config_bool(key, value);
else if (!strcmp(subkey, ".prune"))
remote->prune = git_config_bool(key, value);
else if (!strcmp(subkey, ".url")) {
const char *v;
if (git_config_string(&v, key, value))
return -1;
add_url(remote, v);
} else if (!strcmp(subkey, ".pushurl")) {
const char *v;
if (git_config_string(&v, key, value))
return -1;
add_pushurl(remote, v);
} else if (!strcmp(subkey, ".push")) {
const char *v;
if (git_config_string(&v, key, value))
return -1;
add_push_refspec(remote, v);
} else if (!strcmp(subkey, ".fetch")) {
const char *v;
if (git_config_string(&v, key, value))
return -1;
add_fetch_refspec(remote, v);
} else if (!strcmp(subkey, ".receivepack")) {
const char *v;
if (git_config_string(&v, key, value))
return -1;
if (!remote->receivepack)
remote->receivepack = v;
else
error("more than one receivepack given, using the first");
} else if (!strcmp(subkey, ".uploadpack")) {
const char *v;
if (git_config_string(&v, key, value))
return -1;
if (!remote->uploadpack)
remote->uploadpack = v;
else
error("more than one uploadpack given, using the first");
} else if (!strcmp(subkey, ".tagopt")) {
if (!strcmp(value, "--no-tags"))
remote->fetch_tags = -1;
else if (!strcmp(value, "--tags"))
remote->fetch_tags = 2;
} else if (!strcmp(subkey, ".proxy")) {
return git_config_string((const char **)&remote->http_proxy,
key, value);
} else if (!strcmp(subkey, ".vcs")) {
return git_config_string(&remote->foreign_vcs, key, value);
}
return 0;
}
static void alias_all_urls(void)
{
int i, j;
for (i = 0; i < remotes_nr; i++) {
int add_pushurl_aliases;
if (!remotes[i])
continue;
for (j = 0; j < remotes[i]->pushurl_nr; j++) {
remotes[i]->pushurl[j] = alias_url(remotes[i]->pushurl[j], &rewrites);
}
add_pushurl_aliases = remotes[i]->pushurl_nr == 0;
for (j = 0; j < remotes[i]->url_nr; j++) {
if (add_pushurl_aliases)
add_pushurl_alias(remotes[i], remotes[i]->url[j]);
remotes[i]->url[j] = alias_url(remotes[i]->url[j], &rewrites);
}
}
}
static void read_config(void)
{
static int loaded;
struct object_id oid;
const char *head_ref;
int flag;
if (loaded)
return;
loaded = 1;
current_branch = NULL;
head_ref = resolve_ref_unsafe("HEAD", 0, oid.hash, &flag);
if (head_ref && (flag & REF_ISSYMREF) &&
skip_prefix(head_ref, "refs/heads/", &head_ref)) {
current_branch = make_branch(head_ref, 0);
}
git_config(handle_config, NULL);
alias_all_urls();
}
/*
* This function frees a refspec array.
* Warning: code paths should be checked to ensure that the src
* and dst pointers are always freeable pointers as well
* as the refspec pointer itself.
*/
static void free_refspecs(struct refspec *refspec, int nr_refspec)
{
int i;
if (!refspec)
return;
for (i = 0; i < nr_refspec; i++) {
free(refspec[i].src);
free(refspec[i].dst);
}
free(refspec);
}
static struct refspec *parse_refspec_internal(int nr_refspec, const char **refspec, int fetch, int verify)
{
int i;
struct refspec *rs = xcalloc(nr_refspec, sizeof(*rs));
for (i = 0; i < nr_refspec; i++) {
size_t llen;
int is_glob;
const char *lhs, *rhs;
int flags;
is_glob = 0;
lhs = refspec[i];
if (*lhs == '+') {
rs[i].force = 1;
lhs++;
}
rhs = strrchr(lhs, ':');
/*
* Before going on, special case ":" (or "+:") as a refspec
* for pushing matching refs.
*/
if (!fetch && rhs == lhs && rhs[1] == '\0') {
rs[i].matching = 1;
continue;
}
if (rhs) {
size_t rlen = strlen(++rhs);
is_glob = (1 <= rlen && strchr(rhs, '*'));
rs[i].dst = xstrndup(rhs, rlen);
}
llen = (rhs ? (rhs - lhs - 1) : strlen(lhs));
if (1 <= llen && memchr(lhs, '*', llen)) {
if ((rhs && !is_glob) || (!rhs && fetch))
goto invalid;
is_glob = 1;
} else if (rhs && is_glob) {
goto invalid;
}
rs[i].pattern = is_glob;
rs[i].src = xstrndup(lhs, llen);
flags = REFNAME_ALLOW_ONELEVEL | (is_glob ? REFNAME_REFSPEC_PATTERN : 0);
if (fetch) {
struct object_id unused;
/* LHS */
if (!*rs[i].src)
; /* empty is ok; it means "HEAD" */
else if (llen == GIT_SHA1_HEXSZ && !get_oid_hex(rs[i].src, &unused))
rs[i].exact_sha1 = 1; /* ok */
else if (!check_refname_format(rs[i].src, flags))
; /* valid looking ref is ok */
else
goto invalid;
/* RHS */
if (!rs[i].dst)
; /* missing is ok; it is the same as empty */
else if (!*rs[i].dst)
; /* empty is ok; it means "do not store" */
else if (!check_refname_format(rs[i].dst, flags))
; /* valid looking ref is ok */
else
goto invalid;
} else {
/*
* LHS
* - empty is allowed; it means delete.
* - when wildcarded, it must be a valid looking ref.
* - otherwise, it must be an extended SHA-1, but
* there is no existing way to validate this.
*/
if (!*rs[i].src)
; /* empty is ok */
else if (is_glob) {
if (check_refname_format(rs[i].src, flags))
goto invalid;
}
else
; /* anything goes, for now */
/*
* RHS
* - missing is allowed, but LHS then must be a
* valid looking ref.
* - empty is not allowed.
* - otherwise it must be a valid looking ref.
*/
if (!rs[i].dst) {
if (check_refname_format(rs[i].src, flags))
goto invalid;
} else if (!*rs[i].dst) {
goto invalid;
} else {
if (check_refname_format(rs[i].dst, flags))
goto invalid;
}
}
}
return rs;
invalid:
if (verify) {
/*
* nr_refspec must be greater than zero and i must be valid
* since it is only possible to reach this point from within
* the for loop above.
*/
free_refspecs(rs, i+1);
return NULL;
}
die("Invalid refspec '%s'", refspec[i]);
}
int valid_fetch_refspec(const char *fetch_refspec_str)
{
struct refspec *refspec;
refspec = parse_refspec_internal(1, &fetch_refspec_str, 1, 1);
free_refspecs(refspec, 1);
return !!refspec;
}
struct refspec *parse_fetch_refspec(int nr_refspec, const char **refspec)
{
return parse_refspec_internal(nr_refspec, refspec, 1, 0);
}
static struct refspec *parse_push_refspec(int nr_refspec, const char **refspec)
{
return parse_refspec_internal(nr_refspec, refspec, 0, 0);
}
void free_refspec(int nr_refspec, struct refspec *refspec)
{
int i;
for (i = 0; i < nr_refspec; i++) {
free(refspec[i].src);
free(refspec[i].dst);
}
free(refspec);
}
static int valid_remote_nick(const char *name)
{
if (!name[0] || is_dot_or_dotdot(name))
return 0;
return !strchr(name, '/'); /* no slash */
}
const char *remote_for_branch(struct branch *branch, int *explicit)
{
if (branch && branch->remote_name) {
if (explicit)
*explicit = 1;
return branch->remote_name;
}
if (explicit)
*explicit = 0;
return "origin";
}
const char *pushremote_for_branch(struct branch *branch, int *explicit)
{
if (branch && branch->pushremote_name) {
if (explicit)
*explicit = 1;
return branch->pushremote_name;
}
if (pushremote_name) {
if (explicit)
*explicit = 1;
return pushremote_name;
}
return remote_for_branch(branch, explicit);
}
static struct remote *remote_get_1(const char *name,
const char *(*get_default)(struct branch *, int *))
{
struct remote *ret;
int name_given = 0;
read_config();
if (name)
name_given = 1;
else
name = get_default(current_branch, &name_given);
ret = make_remote(name, 0);
if (valid_remote_nick(name)) {
if (!valid_remote(ret))
read_remotes_file(ret);
if (!valid_remote(ret))
read_branches_file(ret);
}
if (name_given && !valid_remote(ret))
add_url_alias(ret, name);
if (!valid_remote(ret))
return NULL;
ret->fetch = parse_fetch_refspec(ret->fetch_refspec_nr, ret->fetch_refspec);
ret->push = parse_push_refspec(ret->push_refspec_nr, ret->push_refspec);
return ret;
}
struct remote *remote_get(const char *name)
{
return remote_get_1(name, remote_for_branch);
}
struct remote *pushremote_get(const char *name)
{
return remote_get_1(name, pushremote_for_branch);
}
int remote_is_configured(const char *name)
{
struct remotes_hash_key lookup;
struct hashmap_entry lookup_entry;
read_config();
init_remotes_hash();
lookup.str = name;
lookup.len = strlen(name);
hashmap_entry_init(&lookup_entry, memhash(name, lookup.len));
return hashmap_get(&remotes_hash, &lookup_entry, &lookup) != NULL;
}
int for_each_remote(each_remote_fn fn, void *priv)
{
int i, result = 0;
read_config();
for (i = 0; i < remotes_nr && !result; i++) {
struct remote *r = remotes[i];
if (!r)
continue;
if (!r->fetch)
r->fetch = parse_fetch_refspec(r->fetch_refspec_nr,
r->fetch_refspec);
if (!r->push)
r->push = parse_push_refspec(r->push_refspec_nr,
r->push_refspec);
result = fn(r, priv);
}
return result;
}
static void handle_duplicate(struct ref *ref1, struct ref *ref2)
{
if (strcmp(ref1->name, ref2->name)) {
if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
ref2->fetch_head_status != FETCH_HEAD_IGNORE) {
die(_("Cannot fetch both %s and %s to %s"),
ref1->name, ref2->name, ref2->peer_ref->name);
} else if (ref1->fetch_head_status != FETCH_HEAD_IGNORE &&
ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
warning(_("%s usually tracks %s, not %s"),
ref2->peer_ref->name, ref2->name, ref1->name);
} else if (ref1->fetch_head_status == FETCH_HEAD_IGNORE &&
ref2->fetch_head_status == FETCH_HEAD_IGNORE) {
die(_("%s tracks both %s and %s"),
ref2->peer_ref->name, ref1->name, ref2->name);
} else {
/*
* This last possibility doesn't occur because
* FETCH_HEAD_IGNORE entries always appear at
* the end of the list.
*/
die(_("Internal error"));
}
}
free(ref2->peer_ref);
free(ref2);
}
struct ref *ref_remove_duplicates(struct ref *ref_map)
{
struct string_list refs = STRING_LIST_INIT_NODUP;
struct ref *retval = NULL;
struct ref **p = &retval;
while (ref_map) {
struct ref *ref = ref_map;
ref_map = ref_map->next;
ref->next = NULL;
if (!ref->peer_ref) {
*p = ref;
p = &ref->next;
} else {
struct string_list_item *item =
string_list_insert(&refs, ref->peer_ref->name);
if (item->util) {
/* Entry already existed */
handle_duplicate((struct ref *)item->util, ref);
} else {
*p = ref;
p = &ref->next;
item->util = ref;
}
}
}
string_list_clear(&refs, 0);
return retval;
}
int remote_has_url(struct remote *remote, const char *url)
{
int i;
for (i = 0; i < remote->url_nr; i++) {
if (!strcmp(remote->url[i], url))
return 1;
}
return 0;
}
static int match_name_with_pattern(const char *key, const char *name,
const char *value, char **result)
{
const char *kstar = strchr(key, '*');
size_t klen;
size_t ksuffixlen;
size_t namelen;
int ret;
if (!kstar)
die("Key '%s' of pattern had no '*'", key);
klen = kstar - key;
ksuffixlen = strlen(kstar + 1);
namelen = strlen(name);
ret = !strncmp(name, key, klen) && namelen >= klen + ksuffixlen &&
!memcmp(name + namelen - ksuffixlen, kstar + 1, ksuffixlen);
if (ret && value) {
struct strbuf sb = STRBUF_INIT;
const char *vstar = strchr(value, '*');
if (!vstar)
die("Value '%s' of pattern has no '*'", value);
strbuf_add(&sb, value, vstar - value);
strbuf_add(&sb, name + klen, namelen - klen - ksuffixlen);
strbuf_addstr(&sb, vstar + 1);
*result = strbuf_detach(&sb, NULL);
}
return ret;
}
static void query_refspecs_multiple(struct refspec *refs, int ref_count, struct refspec *query, struct string_list *results)
{
int i;
int find_src = !query->src;
if (find_src && !query->dst)
error("query_refspecs_multiple: need either src or dst");
for (i = 0; i < ref_count; i++) {
struct refspec *refspec = &refs[i];
const char *key = find_src ? refspec->dst : refspec->src;
const char *value = find_src ? refspec->src : refspec->dst;
const char *needle = find_src ? query->dst : query->src;
char **result = find_src ? &query->src : &query->dst;
if (!refspec->dst)
continue;
if (refspec->pattern) {
if (match_name_with_pattern(key, needle, value, result))
string_list_append_nodup(results, *result);
} else if (!strcmp(needle, key)) {
string_list_append(results, value);
}
}
}
int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
{
int i;
int find_src = !query->src;
const char *needle = find_src ? query->dst : query->src;
char **result = find_src ? &query->src : &query->dst;
if (find_src && !query->dst)
return error("query_refspecs: need either src or dst");
for (i = 0; i < ref_count; i++) {
struct refspec *refspec = &refs[i];
const char *key = find_src ? refspec->dst : refspec->src;
const char *value = find_src ? refspec->src : refspec->dst;
if (!refspec->dst)
continue;
if (refspec->pattern) {
if (match_name_with_pattern(key, needle, value, result)) {
query->force = refspec->force;
return 0;
}
} else if (!strcmp(needle, key)) {
*result = xstrdup(value);
query->force = refspec->force;
return 0;
}
}
return -1;
}
char *apply_refspecs(struct refspec *refspecs, int nr_refspec,
const char *name)
{
struct refspec query;
memset(&query, 0, sizeof(struct refspec));
query.src = (char *)name;
if (query_refspecs(refspecs, nr_refspec, &query))
return NULL;
return query.dst;
}
int remote_find_tracking(struct remote *remote, struct refspec *refspec)
{
return query_refspecs(remote->fetch, remote->fetch_refspec_nr, refspec);
}
static struct ref *alloc_ref_with_prefix(const char *prefix, size_t prefixlen,
const char *name)
{
size_t len = strlen(name);
struct ref *ref = xcalloc(1, st_add4(sizeof(*ref), prefixlen, len, 1));
memcpy(ref->name, prefix, prefixlen);
memcpy(ref->name + prefixlen, name, len);
return ref;
}
struct ref *alloc_ref(const char *name)
{
return alloc_ref_with_prefix("", 0, name);
}
struct ref *copy_ref(const struct ref *ref)
{
struct ref *cpy;
size_t len;
if (!ref)
return NULL;
len = st_add3(sizeof(struct ref), strlen(ref->name), 1);
cpy = xmalloc(len);
memcpy(cpy, ref, len);
cpy->next = NULL;
cpy->symref = xstrdup_or_null(ref->symref);
cpy->remote_status = xstrdup_or_null(ref->remote_status);
cpy->peer_ref = copy_ref(ref->peer_ref);
return cpy;
}
struct ref *copy_ref_list(const struct ref *ref)
{
struct ref *ret = NULL;
struct ref **tail = &ret;
while (ref) {
*tail = copy_ref(ref);
ref = ref->next;
tail = &((*tail)->next);
}
return ret;
}
static void free_ref(struct ref *ref)
{
if (!ref)
return;
free_ref(ref->peer_ref);
free(ref->remote_status);
free(ref->symref);
free(ref);
}
void free_refs(struct ref *ref)
{
struct ref *next;
while (ref) {
next = ref->next;
free_ref(ref);
ref = next;
}
}
int ref_compare_name(const void *va, const void *vb)
{
const struct ref *a = va, *b = vb;
return strcmp(a->name, b->name);
}
static void *ref_list_get_next(const void *a)
{
return ((const struct ref *)a)->next;
}
static void ref_list_set_next(void *a, void *next)
{
((struct ref *)a)->next = next;
}
void sort_ref_list(struct ref **l, int (*cmp)(const void *, const void *))
{
*l = llist_mergesort(*l, ref_list_get_next, ref_list_set_next, cmp);
}
int count_refspec_match(const char *pattern,
struct ref *refs,
struct ref **matched_ref)
{
int patlen = strlen(pattern);
struct ref *matched_weak = NULL;
struct ref *matched = NULL;
int weak_match = 0;
int match = 0;
for (weak_match = match = 0; refs; refs = refs->next) {
char *name = refs->name;
int namelen = strlen(name);
if (!refname_match(pattern, name))
continue;
/* A match is "weak" if it is with refs outside
* heads or tags, and did not specify the pattern
* in full (e.g. "refs/remotes/origin/master") or at
* least from the toplevel (e.g. "remotes/origin/master");
* otherwise "git push $URL master" would result in
* ambiguity between remotes/origin/master and heads/master
* at the remote site.
*/
if (namelen != patlen &&
patlen != namelen - 5 &&
!starts_with(name, "refs/heads/") &&
!starts_with(name, "refs/tags/")) {
/* We want to catch the case where only weak
* matches are found and there are multiple
* matches, and where more than one strong
* matches are found, as ambiguous. One
* strong match with zero or more weak matches
* are acceptable as a unique match.
*/
matched_weak = refs;
weak_match++;
}
else {
matched = refs;
match++;
}
}
if (!matched) {
if (matched_ref)
*matched_ref = matched_weak;
return weak_match;
}
else {
if (matched_ref)
*matched_ref = matched;
return match;
}
}
static void tail_link_ref(struct ref *ref, struct ref ***tail)
{
**tail = ref;
while (ref->next)
ref = ref->next;
*tail = &ref->next;
}
static struct ref *alloc_delete_ref(void)
{
struct ref *ref = alloc_ref("(delete)");
oidclr(&ref->new_oid);
return ref;
}
static int try_explicit_object_name(const char *name,
struct ref **match)
{
struct object_id oid;
if (!*name) {
if (match)
*match = alloc_delete_ref();
return 0;
}
if (get_sha1(name, oid.hash))
return -1;
if (match) {
*match = alloc_ref(name);
oidcpy(&(*match)->new_oid, &oid);
}
return 0;
}
static struct ref *make_linked_ref(const char *name, struct ref ***tail)
{
struct ref *ret = alloc_ref(name);
tail_link_ref(ret, tail);
return ret;
}
static char *guess_ref(const char *name, struct ref *peer)
{
struct strbuf buf = STRBUF_INIT;
struct object_id oid;
const char *r = resolve_ref_unsafe(peer->name, RESOLVE_REF_READING,
oid.hash, NULL);
if (!r)
return NULL;
if (starts_with(r, "refs/heads/"))
strbuf_addstr(&buf, "refs/heads/");
else if (starts_with(r, "refs/tags/"))
strbuf_addstr(&buf, "refs/tags/");
else
return NULL;
strbuf_addstr(&buf, name);
return strbuf_detach(&buf, NULL);
}
static int match_explicit_lhs(struct ref *src,
struct refspec *rs,
struct ref **match,
int *allocated_match)
{
switch (count_refspec_match(rs->src, src, match)) {
case 1:
if (allocated_match)
*allocated_match = 0;
return 0;
case 0:
/* The source could be in the get_sha1() format
* not a reference name. :refs/other is a
* way to delete 'other' ref at the remote end.
*/
if (try_explicit_object_name(rs->src, match) < 0)
return error("src refspec %s does not match any.", rs->src);
if (allocated_match)
*allocated_match = 1;
return 0;
default:
return error("src refspec %s matches more than one.", rs->src);
}
}
static int match_explicit(struct ref *src, struct ref *dst,
struct ref ***dst_tail,
struct refspec *rs)
{
struct ref *matched_src, *matched_dst;
int allocated_src;
const char *dst_value = rs->dst;
char *dst_guess;
if (rs->pattern || rs->matching)
return 0;
matched_src = matched_dst = NULL;
if (match_explicit_lhs(src, rs, &matched_src, &allocated_src) < 0)
return -1;
if (!dst_value) {
struct object_id oid;
int flag;
dst_value = resolve_ref_unsafe(matched_src->name,
RESOLVE_REF_READING,
oid.hash, &flag);
if (!dst_value ||
((flag & REF_ISSYMREF) &&
!starts_with(dst_value, "refs/heads/")))
die("%s cannot be resolved to branch.",
matched_src->name);
}
switch (count_refspec_match(dst_value, dst, &matched_dst)) {
case 1:
break;
case 0:
if (starts_with(dst_value, "refs/"))
matched_dst = make_linked_ref(dst_value, dst_tail);
else if (is_null_oid(&matched_src->new_oid))
error("unable to delete '%s': remote ref does not exist",
dst_value);
else if ((dst_guess = guess_ref(dst_value, matched_src)))
matched_dst = make_linked_ref(dst_guess, dst_tail);
else
error("unable to push to unqualified destination: %s\n"
"The destination refspec neither matches an "
"existing ref on the remote nor\n"
"begins with refs/, and we are unable to "
"guess a prefix based on the source ref.",
dst_value);
break;
default:
matched_dst = NULL;
error("dst refspec %s matches more than one.",
dst_value);
break;
}
if (!matched_dst)
return -1;
if (matched_dst->peer_ref)
return error("dst ref %s receives from more than one src.",
matched_dst->name);
else {
matched_dst->peer_ref = allocated_src ?
matched_src :
copy_ref(matched_src);
matched_dst->force = rs->force;
}
return 0;
}
static int match_explicit_refs(struct ref *src, struct ref *dst,
struct ref ***dst_tail, struct refspec *rs,
int rs_nr)
{
int i, errs;
for (i = errs = 0; i < rs_nr; i++)
errs += match_explicit(src, dst, dst_tail, &rs[i]);
return errs;
}
static char *get_ref_match(const struct refspec *rs, int rs_nr, const struct ref *ref,
int send_mirror, int direction, const struct refspec **ret_pat)
{
const struct refspec *pat;
char *name;
int i;
int matching_refs = -1;
for (i = 0; i < rs_nr; i++) {
if (rs[i].matching &&
(matching_refs == -1 || rs[i].force)) {
matching_refs = i;
continue;
}
if (rs[i].pattern) {
const char *dst_side = rs[i].dst ? rs[i].dst : rs[i].src;
int match;
if (direction == FROM_SRC)
match = match_name_with_pattern(rs[i].src, ref->name, dst_side, &name);
else
match = match_name_with_pattern(dst_side, ref->name, rs[i].src, &name);
if (match) {
matching_refs = i;
break;
}
}
}
if (matching_refs == -1)
return NULL;
pat = rs + matching_refs;
if (pat->matching) {
/*
* "matching refs"; traditionally we pushed everything
* including refs outside refs/heads/ hierarchy, but
* that does not make much sense these days.
*/
if (!send_mirror && !starts_with(ref->name, "refs/heads/"))
return NULL;
name = xstrdup(ref->name);
}
if (ret_pat)
*ret_pat = pat;
return name;
}
static struct ref **tail_ref(struct ref **head)
{
struct ref **tail = head;
while (*tail)
tail = &((*tail)->next);
return tail;
}
struct tips {
struct commit **tip;
int nr, alloc;
};
static void add_to_tips(struct tips *tips, const struct object_id *oid)
{
struct commit *commit;
if (is_null_oid(oid))
return;
commit = lookup_commit_reference_gently(oid->hash, 1);
if (!commit || (commit->object.flags & TMP_MARK))
return;
commit->object.flags |= TMP_MARK;
ALLOC_GROW(tips->tip, tips->nr + 1, tips->alloc);
tips->tip[tips->nr++] = commit;
}
static void add_missing_tags(struct ref *src, struct ref **dst, struct ref ***dst_tail)
{
struct string_list dst_tag = STRING_LIST_INIT_NODUP;
struct string_list src_tag = STRING_LIST_INIT_NODUP;
struct string_list_item *item;
struct ref *ref;
struct tips sent_tips;
/*
* Collect everything we know they would have at the end of
* this push, and collect all tags they have.
*/
memset(&sent_tips, 0, sizeof(sent_tips));
for (ref = *dst; ref; ref = ref->next) {
if (ref->peer_ref &&
!is_null_oid(&ref->peer_ref->new_oid))
add_to_tips(&sent_tips, &ref->peer_ref->new_oid);
else
add_to_tips(&sent_tips, &ref->old_oid);
if (starts_with(ref->name, "refs/tags/"))
string_list_append(&dst_tag, ref->name);
}
clear_commit_marks_many(sent_tips.nr, sent_tips.tip, TMP_MARK);
string_list_sort(&dst_tag);
/* Collect tags they do not have. */
for (ref = src; ref; ref = ref->next) {
if (!starts_with(ref->name, "refs/tags/"))
continue; /* not a tag */
if (string_list_has_string(&dst_tag, ref->name))
continue; /* they already have it */
if (sha1_object_info(ref->new_oid.hash, NULL) != OBJ_TAG)
continue; /* be conservative */
item = string_list_append(&src_tag, ref->name);
item->util = ref;
}
string_list_clear(&dst_tag, 0);
/*
* At this point, src_tag lists tags that are missing from
* dst, and sent_tips lists the tips we are pushing or those
* that we know they already have. An element in the src_tag
* that is an ancestor of any of the sent_tips needs to be
* sent to the other side.
*/
if (sent_tips.nr) {
for_each_string_list_item(item, &src_tag) {
struct ref *ref = item->util;
struct ref *dst_ref;
struct commit *commit;
if (is_null_oid(&ref->new_oid))
continue;
commit = lookup_commit_reference_gently(ref->new_oid.hash, 1);
if (!commit)
/* not pushing a commit, which is not an error */
continue;
/*
* Is this tag, which they do not have, reachable from
* any of the commits we are sending?
*/
if (!in_merge_bases_many(commit, sent_tips.nr, sent_tips.tip))
continue;
/* Add it in */
dst_ref = make_linked_ref(ref->name, dst_tail);
oidcpy(&dst_ref->new_oid, &ref->new_oid);
dst_ref->peer_ref = copy_ref(ref);
}
}
string_list_clear(&src_tag, 0);
free(sent_tips.tip);
}
struct ref *find_ref_by_name(const struct ref *list, const char *name)
{
for ( ; list; list = list->next)
if (!strcmp(list->name, name))
return (struct ref *)list;
return NULL;
}
static void prepare_ref_index(struct string_list *ref_index, struct ref *ref)
{
for ( ; ref; ref = ref->next)
string_list_append_nodup(ref_index, ref->name)->util = ref;
string_list_sort(ref_index);
}
/*
* Given only the set of local refs, sanity-check the set of push
* refspecs. We can't catch all errors that match_push_refs would,
* but we can catch some errors early before even talking to the
* remote side.
*/
int check_push_refs(struct ref *src, int nr_refspec, const char **refspec_names)
{
struct refspec *refspec = parse_push_refspec(nr_refspec, refspec_names);
int ret = 0;
int i;
for (i = 0; i < nr_refspec; i++) {
struct refspec *rs = refspec + i;
if (rs->pattern || rs->matching)
continue;
ret |= match_explicit_lhs(src, rs, NULL, NULL);
}
free_refspec(nr_refspec, refspec);
return ret;
}
/*
* Given the set of refs the local repository has, the set of refs the
* remote repository has, and the refspec used for push, determine
* what remote refs we will update and with what value by setting
* peer_ref (which object is being pushed) and force (if the push is
* forced) in elements of "dst". The function may add new elements to
* dst (e.g. pushing to a new branch, done in match_explicit_refs).
*/
int match_push_refs(struct ref *src, struct ref **dst,
int nr_refspec, const char **refspec, int flags)
{
struct refspec *rs;
int send_all = flags & MATCH_REFS_ALL;
int send_mirror = flags & MATCH_REFS_MIRROR;
int send_prune = flags & MATCH_REFS_PRUNE;
int errs;
static const char *default_refspec[] = { ":", NULL };
struct ref *ref, **dst_tail = tail_ref(dst);
struct string_list dst_ref_index = STRING_LIST_INIT_NODUP;
if (!nr_refspec) {
nr_refspec = 1;
refspec = default_refspec;
}
rs = parse_push_refspec(nr_refspec, (const char **) refspec);
errs = match_explicit_refs(src, *dst, &dst_tail, rs, nr_refspec);
/* pick the remainder */
for (ref = src; ref; ref = ref->next) {
struct string_list_item *dst_item;
struct ref *dst_peer;
const struct refspec *pat = NULL;
char *dst_name;
dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
if (!dst_name)
continue;
if (!dst_ref_index.nr)
prepare_ref_index(&dst_ref_index, *dst);
dst_item = string_list_lookup(&dst_ref_index, dst_name);
dst_peer = dst_item ? dst_item->util : NULL;
if (dst_peer) {
if (dst_peer->peer_ref)
/* We're already sending something to this ref. */
goto free_name;
} else {
if (pat->matching && !(send_all || send_mirror))
/*
* Remote doesn't have it, and we have no
* explicit pattern, and we don't have
* --all or --mirror.
*/
goto free_name;
/* Create a new one and link it */
dst_peer = make_linked_ref(dst_name, &dst_tail);
oidcpy(&dst_peer->new_oid, &ref->new_oid);
string_list_insert(&dst_ref_index,
dst_peer->name)->util = dst_peer;
}
dst_peer->peer_ref = copy_ref(ref);
dst_peer->force = pat->force;
free_name:
free(dst_name);
}
string_list_clear(&dst_ref_index, 0);
if (flags & MATCH_REFS_FOLLOW_TAGS)
add_missing_tags(src, dst, &dst_tail);
if (send_prune) {
struct string_list src_ref_index = STRING_LIST_INIT_NODUP;
/* check for missing refs on the remote */
for (ref = *dst; ref; ref = ref->next) {
char *src_name;
if (ref->peer_ref)
/* We're already sending something to this ref. */
continue;
src_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_DST, NULL);
if (src_name) {
if (!src_ref_index.nr)
prepare_ref_index(&src_ref_index, src);
if (!string_list_has_string(&src_ref_index,
src_name))
ref->peer_ref = alloc_delete_ref();
free(src_name);
}
}
string_list_clear(&src_ref_index, 0);
}
if (errs)
return -1;
return 0;
}
void set_ref_status_for_push(struct ref *remote_refs, int send_mirror,
int force_update)
{
struct ref *ref;
for (ref = remote_refs; ref; ref = ref->next) {
int force_ref_update = ref->force || force_update;
int reject_reason = 0;
if (ref->peer_ref)
oidcpy(&ref->new_oid, &ref->peer_ref->new_oid);
else if (!send_mirror)
continue;
ref->deletion = is_null_oid(&ref->new_oid);
if (!ref->deletion &&
!oidcmp(&ref->old_oid, &ref->new_oid)) {
ref->status = REF_STATUS_UPTODATE;
continue;
}
/*
* Bypass the usual "must fast-forward" check but
* replace it with a weaker "the old value must be
* this value we observed". If the remote ref has
* moved and is now different from what we expect,
* reject any push.
*
* It also is an error if the user told us to check
* with the remote-tracking branch to find the value
* to expect, but we did not have such a tracking
* branch.
*/
if (ref->expect_old_sha1) {
if (ref->expect_old_no_trackback ||
oidcmp(&ref->old_oid, &ref->old_oid_expect))
reject_reason = REF_STATUS_REJECT_STALE;
}
/*
* The usual "must fast-forward" rules.
*
* Decide whether an individual refspec A:B can be
* pushed. The push will succeed if any of the
* following are true:
*
* (1) the remote reference B does not exist
*
* (2) the remote reference B is being removed (i.e.,
* pushing :B where no source is specified)
*
* (3) the destination is not under refs/tags/, and
* if the old and new value is a commit, the new
* is a descendant of the old.
*
* (4) it is forced using the +A:B notation, or by
* passing the --force argument
*/
else if (!ref->deletion && !is_null_oid(&ref->old_oid)) {
if (starts_with(ref->name, "refs/tags/"))
reject_reason = REF_STATUS_REJECT_ALREADY_EXISTS;
else if (!has_object_file(&ref->old_oid))
reject_reason = REF_STATUS_REJECT_FETCH_FIRST;
else if (!lookup_commit_reference_gently(ref->old_oid.hash, 1) ||
!lookup_commit_reference_gently(ref->new_oid.hash, 1))
reject_reason = REF_STATUS_REJECT_NEEDS_FORCE;
else if (!ref_newer(&ref->new_oid, &ref->old_oid))
reject_reason = REF_STATUS_REJECT_NONFASTFORWARD;
}
/*
* "--force" will defeat any rejection implemented
* by the rules above.
*/
if (!force_ref_update)
ref->status = reject_reason;
else if (reject_reason)
ref->forced_update = 1;
}
}
static void set_merge(struct branch *ret)
{
struct remote *remote;
char *ref;
struct object_id oid;
int i;
if (!ret)
return; /* no branch */
if (ret->merge)
return; /* already run */
if (!ret->remote_name || !ret->merge_nr) {
/*
* no merge config; let's make sure we don't confuse callers
* with a non-zero merge_nr but a NULL merge
*/
ret->merge_nr = 0;
return;
}
remote = remote_get(ret->remote_name);
ret->merge = xcalloc(ret->merge_nr, sizeof(*ret->merge));
for (i = 0; i < ret->merge_nr; i++) {
ret->merge[i] = xcalloc(1, sizeof(**ret->merge));
ret->merge[i]->src = xstrdup(ret->merge_name[i]);
if (!remote_find_tracking(remote, ret->merge[i]) ||
strcmp(ret->remote_name, "."))
continue;
if (dwim_ref(ret->merge_name[i], strlen(ret->merge_name[i]),
oid.hash, &ref) == 1)
ret->merge[i]->dst = ref;
else
ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
}
}
struct branch *branch_get(const char *name)
{
struct branch *ret;
read_config();
if (!name || !*name || !strcmp(name, "HEAD"))
ret = current_branch;
else
ret = make_branch(name, 0);
set_merge(ret);
return ret;
}
int branch_has_merge_config(struct branch *branch)
{
return branch && !!branch->merge;
}
int branch_merge_matches(struct branch *branch,
int i,
const char *refname)
{
if (!branch || i < 0 || i >= branch->merge_nr)
return 0;
return refname_match(branch->merge[i]->src, refname);
}
__attribute((format (printf,2,3)))
static const char *error_buf(struct strbuf *err, const char *fmt, ...)
{
if (err) {
va_list ap;
va_start(ap, fmt);
strbuf_vaddf(err, fmt, ap);
va_end(ap);
}
return NULL;
}
const char *branch_get_upstream(struct branch *branch, struct strbuf *err)
{
if (!branch)
return error_buf(err, _("HEAD does not point to a branch"));
if (!branch->merge || !branch->merge[0]) {
/*
* no merge config; is it because the user didn't define any,
* or because it is not a real branch, and get_branch
* auto-vivified it?
*/
if (!ref_exists(branch->refname))
return error_buf(err, _("no such branch: '%s'"),
branch->name);
return error_buf(err,
_("no upstream configured for branch '%s'"),
branch->name);
}
if (!branch->merge[0]->dst)
return error_buf(err,
_("upstream branch '%s' not stored as a remote-tracking branch"),
branch->merge[0]->src);
return branch->merge[0]->dst;
}
static const char *tracking_for_push_dest(struct remote *remote,
const char *refname,
struct strbuf *err)
{
char *ret;
ret = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
if (!ret)
return error_buf(err,
_("push destination '%s' on remote '%s' has no local tracking branch"),
refname, remote->name);
return ret;
}
static const char *branch_get_push_1(struct branch *branch, struct strbuf *err)
{
struct remote *remote;
if (!branch)
return error_buf(err, _("HEAD does not point to a branch"));
remote = remote_get(pushremote_for_branch(branch, NULL));
if (!remote)
return error_buf(err,
_("branch '%s' has no remote for pushing"),
branch->name);
if (remote->push_refspec_nr) {
char *dst;
const char *ret;
dst = apply_refspecs(remote->push, remote->push_refspec_nr,
branch->refname);
if (!dst)
return error_buf(err,
_("push refspecs for '%s' do not include '%s'"),
remote->name, branch->name);
ret = tracking_for_push_dest(remote, dst, err);
free(dst);
return ret;
}
if (remote->mirror)
return tracking_for_push_dest(remote, branch->refname, err);
switch (push_default) {
case PUSH_DEFAULT_NOTHING:
return error_buf(err, _("push has no destination (push.default is 'nothing')"));
case PUSH_DEFAULT_MATCHING:
case PUSH_DEFAULT_CURRENT:
return tracking_for_push_dest(remote, branch->refname, err);
case PUSH_DEFAULT_UPSTREAM:
return branch_get_upstream(branch, err);
case PUSH_DEFAULT_UNSPECIFIED:
case PUSH_DEFAULT_SIMPLE:
{
const char *up, *cur;
up = branch_get_upstream(branch, err);
if (!up)
return NULL;
cur = tracking_for_push_dest(remote, branch->refname, err);
if (!cur)
return NULL;
if (strcmp(cur, up))
return error_buf(err,
_("cannot resolve 'simple' push to a single destination"));
return cur;
}
}
die("BUG: unhandled push situation");
}
const char *branch_get_push(struct branch *branch, struct strbuf *err)
{
if (!branch->push_tracking_ref)
branch->push_tracking_ref = branch_get_push_1(branch, err);
return branch->push_tracking_ref;
}
static int ignore_symref_update(const char *refname)
{
struct object_id oid;
int flag;
if (!resolve_ref_unsafe(refname, 0, oid.hash, &flag))
return 0; /* non-existing refs are OK */
return (flag & REF_ISSYMREF);
}
/*
* Create and return a list of (struct ref) consisting of copies of
* each remote_ref that matches refspec. refspec must be a pattern.
* Fill in the copies' peer_ref to describe the local tracking refs to
* which they map. Omit any references that would map to an existing
* local symbolic ref.
*/
static struct ref *get_expanded_map(const struct ref *remote_refs,
const struct refspec *refspec)
{
const struct ref *ref;
struct ref *ret = NULL;
struct ref **tail = &ret;
for (ref = remote_refs; ref; ref = ref->next) {
char *expn_name = NULL;
if (strchr(ref->name, '^'))
continue; /* a dereference item */
if (match_name_with_pattern(refspec->src, ref->name,
refspec->dst, &expn_name) &&
!ignore_symref_update(expn_name)) {
struct ref *cpy = copy_ref(ref);
cpy->peer_ref = alloc_ref(expn_name);
if (refspec->force)
cpy->peer_ref->force = 1;
*tail = cpy;
tail = &cpy->next;
}
free(expn_name);
}
return ret;
}
static const struct ref *find_ref_by_name_abbrev(const struct ref *refs, const char *name)
{
const struct ref *ref;
for (ref = refs; ref; ref = ref->next) {
if (refname_match(name, ref->name))
return ref;
}
return NULL;
}
struct ref *get_remote_ref(const struct ref *remote_refs, const char *name)
{
const struct ref *ref = find_ref_by_name_abbrev(remote_refs, name);
if (!ref)
return NULL;
return copy_ref(ref);
}
static struct ref *get_local_ref(const char *name)
{
if (!name || name[0] == '\0')
return NULL;
if (starts_with(name, "refs/"))
return alloc_ref(name);
if (starts_with(name, "heads/") ||
starts_with(name, "tags/") ||
starts_with(name, "remotes/"))
return alloc_ref_with_prefix("refs/", 5, name);
return alloc_ref_with_prefix("refs/heads/", 11, name);
}
int get_fetch_map(const struct ref *remote_refs,
const struct refspec *refspec,
struct ref ***tail,
int missing_ok)
{
struct ref *ref_map, **rmp;
if (refspec->pattern) {
ref_map = get_expanded_map(remote_refs, refspec);
} else {
const char *name = refspec->src[0] ? refspec->src : "HEAD";
if (refspec->exact_sha1) {
ref_map = alloc_ref(name);
get_oid_hex(name, &ref_map->old_oid);
} else {
ref_map = get_remote_ref(remote_refs, name);
}
if (!missing_ok && !ref_map)
die("Couldn't find remote ref %s", name);
if (ref_map) {
ref_map->peer_ref = get_local_ref(refspec->dst);
if (ref_map->peer_ref && refspec->force)
ref_map->peer_ref->force = 1;
}
}
for (rmp = &ref_map; *rmp; ) {
if ((*rmp)->peer_ref) {
if (!starts_with((*rmp)->peer_ref->name, "refs/") ||
check_refname_format((*rmp)->peer_ref->name, 0)) {
struct ref *ignore = *rmp;
error("* Ignoring funny ref '%s' locally",
(*rmp)->peer_ref->name);
*rmp = (*rmp)->next;
free(ignore->peer_ref);
free(ignore);
continue;
}
}
rmp = &((*rmp)->next);
}
if (ref_map)
tail_link_ref(ref_map, tail);
return 0;
}
int resolve_remote_symref(struct ref *ref, struct ref *list)
{
if (!ref->symref)
return 0;
for (; list; list = list->next)
if (!strcmp(ref->symref, list->name)) {
oidcpy(&ref->old_oid, &list->old_oid);
return 0;
}
return 1;
}
static void unmark_and_free(struct commit_list *list, unsigned int mark)
{
while (list) {
struct commit *commit = pop_commit(&list);
commit->object.flags &= ~mark;
}
}
int ref_newer(const struct object_id *new_oid, const struct object_id *old_oid)
{
struct object *o;
struct commit *old, *new;
struct commit_list *list, *used;
int found = 0;
/*
* Both new and old must be commit-ish and new is descendant of
* old. Otherwise we require --force.
*/
o = deref_tag(parse_object(old_oid->hash), NULL, 0);
if (!o || o->type != OBJ_COMMIT)
return 0;
old = (struct commit *) o;
o = deref_tag(parse_object(new_oid->hash), NULL, 0);
if (!o || o->type != OBJ_COMMIT)
return 0;
new = (struct commit *) o;
if (parse_commit(new) < 0)
return 0;
used = list = NULL;
commit_list_insert(new, &list);
while (list) {
new = pop_most_recent_commit(&list, TMP_MARK);
commit_list_insert(new, &used);
if (new == old) {
found = 1;
break;
}
}
unmark_and_free(list, TMP_MARK);
unmark_and_free(used, TMP_MARK);
return found;
}
/*
* Compare a branch with its upstream, and save their differences (number
* of commits) in *num_ours and *num_theirs. The name of the upstream branch
* (or NULL if no upstream is defined) is returned via *upstream_name, if it
* is not itself NULL.
*
* Returns -1 if num_ours and num_theirs could not be filled in (e.g., no
* upstream defined, or ref does not exist), 0 otherwise.
*/
int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs,
const char **upstream_name)
{
struct object_id oid;
struct commit *ours, *theirs;
struct rev_info revs;
const char *base;
struct argv_array argv = ARGV_ARRAY_INIT;
/* Cannot stat unless we are marked to build on top of somebody else. */
base = branch_get_upstream(branch, NULL);
if (upstream_name)
*upstream_name = base;
if (!base)
return -1;
/* Cannot stat if what we used to build on no longer exists */
if (read_ref(base, oid.hash))
return -1;
theirs = lookup_commit_reference(oid.hash);
if (!theirs)
return -1;
if (read_ref(branch->refname, oid.hash))
return -1;
ours = lookup_commit_reference(oid.hash);
if (!ours)
return -1;
/* are we the same? */
if (theirs == ours) {
*num_theirs = *num_ours = 0;
return 0;
}
/* Run "rev-list --left-right ours...theirs" internally... */
argv_array_push(&argv, ""); /* ignored */
argv_array_push(&argv, "--left-right");
argv_array_pushf(&argv, "%s...%s",
oid_to_hex(&ours->object.oid),
oid_to_hex(&theirs->object.oid));
argv_array_push(&argv, "--");
init_revisions(&revs, NULL);
setup_revisions(argv.argc, argv.argv, &revs, NULL);
if (prepare_revision_walk(&revs))
die("revision walk setup failed");
/* ... and count the commits on each side. */
*num_ours = 0;
*num_theirs = 0;
while (1) {
struct commit *c = get_revision(&revs);
if (!c)
break;
if (c->object.flags & SYMMETRIC_LEFT)
(*num_ours)++;
else
(*num_theirs)++;
}
/* clear object flags smudged by the above traversal */
clear_commit_marks(ours, ALL_REV_FLAGS);
clear_commit_marks(theirs, ALL_REV_FLAGS);
argv_array_clear(&argv);
return 0;
}
/*
* Return true when there is anything to report, otherwise false.
*/
int format_tracking_info(struct branch *branch, struct strbuf *sb)
{
int ours, theirs;
const char *full_base;
char *base;
int upstream_is_gone = 0;
if (stat_tracking_info(branch, &ours, &theirs, &full_base) < 0) {
if (!full_base)
return 0;
upstream_is_gone = 1;
}
base = shorten_unambiguous_ref(full_base, 0);
if (upstream_is_gone) {
strbuf_addf(sb,
_("Your branch is based on '%s', but the upstream is gone.\n"),
base);
if (advice_status_hints)
strbuf_addf(sb,
_(" (use \"git branch --unset-upstream\" to fixup)\n"));
} else if (!ours && !theirs) {
strbuf_addf(sb,
_("Your branch is up-to-date with '%s'.\n"),
base);
} else if (!theirs) {
strbuf_addf(sb,
Q_("Your branch is ahead of '%s' by %d commit.\n",
"Your branch is ahead of '%s' by %d commits.\n",
ours),
base, ours);
if (advice_status_hints)
strbuf_addf(sb,
_(" (use \"git push\" to publish your local commits)\n"));
} else if (!ours) {
strbuf_addf(sb,
Q_("Your branch is behind '%s' by %d commit, "
"and can be fast-forwarded.\n",
"Your branch is behind '%s' by %d commits, "
"and can be fast-forwarded.\n",
theirs),
base, theirs);
if (advice_status_hints)
strbuf_addf(sb,
_(" (use \"git pull\" to update your local branch)\n"));
} else {
strbuf_addf(sb,
Q_("Your branch and '%s' have diverged,\n"
"and have %d and %d different commit each, "
"respectively.\n",
"Your branch and '%s' have diverged,\n"
"and have %d and %d different commits each, "
"respectively.\n",
theirs),
base, ours, theirs);
if (advice_status_hints)
strbuf_addf(sb,
_(" (use \"git pull\" to merge the remote branch into yours)\n"));
}
free(base);
return 1;
}
static int one_local_ref(const char *refname, const struct object_id *oid,
int flag, void *cb_data)
{
struct ref ***local_tail = cb_data;
struct ref *ref;
/* we already know it starts with refs/ to get here */
if (check_refname_format(refname + 5, 0))
return 0;
ref = alloc_ref(refname);
oidcpy(&ref->new_oid, oid);
**local_tail = ref;
*local_tail = &ref->next;
return 0;
}
struct ref *get_local_heads(void)
{
struct ref *local_refs = NULL, **local_tail = &local_refs;
for_each_ref(one_local_ref, &local_tail);
return local_refs;
}
struct ref *guess_remote_head(const struct ref *head,
const struct ref *refs,
int all)
{
const struct ref *r;
struct ref *list = NULL;
struct ref **tail = &list;
if (!head)
return NULL;
/*
* Some transports support directly peeking at
* where HEAD points; if that is the case, then
* we don't have to guess.
*/
if (head->symref)
return copy_ref(find_ref_by_name(refs, head->symref));
/* If refs/heads/master could be right, it is. */
if (!all) {
r = find_ref_by_name(refs, "refs/heads/master");
if (r && !oidcmp(&r->old_oid, &head->old_oid))
return copy_ref(r);
}
/* Look for another ref that points there */
for (r = refs; r; r = r->next) {
if (r != head &&
starts_with(r->name, "refs/heads/") &&
!oidcmp(&r->old_oid, &head->old_oid)) {
*tail = copy_ref(r);
tail = &((*tail)->next);
if (!all)
break;
}
}
return list;
}
struct stale_heads_info {
struct string_list *ref_names;
struct ref **stale_refs_tail;
struct refspec *refs;
int ref_count;
};
static int get_stale_heads_cb(const char *refname, const struct object_id *oid,
int flags, void *cb_data)
{
struct stale_heads_info *info = cb_data;
struct string_list matches = STRING_LIST_INIT_DUP;
struct refspec query;
int i, stale = 1;
memset(&query, 0, sizeof(struct refspec));
query.dst = (char *)refname;
query_refspecs_multiple(info->refs, info->ref_count, &query, &matches);
if (matches.nr == 0)
goto clean_exit; /* No matches */
/*
* If we did find a suitable refspec and it's not a symref and
* it's not in the list of refs that currently exist in that
* remote, we consider it to be stale. In order to deal with
* overlapping refspecs, we need to go over all of the
* matching refs.
*/
if (flags & REF_ISSYMREF)
goto clean_exit;
for (i = 0; stale && i < matches.nr; i++)
if (string_list_has_string(info->ref_names, matches.items[i].string))
stale = 0;
if (stale) {
struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
oidcpy(&ref->new_oid, oid);
}
clean_exit:
string_list_clear(&matches, 0);
return 0;
}
struct ref *get_stale_heads(struct refspec *refs, int ref_count, struct ref *fetch_map)
{
struct ref *ref, *stale_refs = NULL;
struct string_list ref_names = STRING_LIST_INIT_NODUP;
struct stale_heads_info info;
info.ref_names = &ref_names;
info.stale_refs_tail = &stale_refs;
info.refs = refs;
info.ref_count = ref_count;
for (ref = fetch_map; ref; ref = ref->next)
string_list_append(&ref_names, ref->name);
string_list_sort(&ref_names);
for_each_ref(get_stale_heads_cb, &info);
string_list_clear(&ref_names, 0);
return stale_refs;
}
/*
* Compare-and-swap
*/
static void clear_cas_option(struct push_cas_option *cas)
{
int i;
for (i = 0; i < cas->nr; i++)
free(cas->entry[i].refname);
free(cas->entry);
memset(cas, 0, sizeof(*cas));
}
static struct push_cas *add_cas_entry(struct push_cas_option *cas,
const char *refname,
size_t refnamelen)
{
struct push_cas *entry;
ALLOC_GROW(cas->entry, cas->nr + 1, cas->alloc);
entry = &cas->entry[cas->nr++];
memset(entry, 0, sizeof(*entry));
entry->refname = xmemdupz(refname, refnamelen);
return entry;
}
int parse_push_cas_option(struct push_cas_option *cas, const char *arg, int unset)
{
const char *colon;
struct push_cas *entry;
if (unset) {
/* "--no-<option>" */
clear_cas_option(cas);
return 0;
}
if (!arg) {
/* just "--<option>" */
cas->use_tracking_for_rest = 1;
return 0;
}
/* "--<option>=refname" or "--<option>=refname:value" */
colon = strchrnul(arg, ':');
entry = add_cas_entry(cas, arg, colon - arg);
if (!*colon)
entry->use_tracking = 1;
else if (get_sha1(colon + 1, entry->expect))
return error("cannot parse expected object name '%s'", colon + 1);
return 0;
}
int parseopt_push_cas_option(const struct option *opt, const char *arg, int unset)
{
return parse_push_cas_option(opt->value, arg, unset);
}
int is_empty_cas(const struct push_cas_option *cas)
{
return !cas->use_tracking_for_rest && !cas->nr;
}
/*
* Look at remote.fetch refspec and see if we have a remote
* tracking branch for the refname there. Fill its current
* value in sha1[].
* If we cannot do so, return negative to signal an error.
*/
static int remote_tracking(struct remote *remote, const char *refname,
struct object_id *oid)
{
char *dst;
dst = apply_refspecs(remote->fetch, remote->fetch_refspec_nr, refname);
if (!dst)
return -1; /* no tracking ref for refname at remote */
if (read_ref(dst, oid->hash))
return -1; /* we know what the tracking ref is but we cannot read it */
return 0;
}
static void apply_cas(struct push_cas_option *cas,
struct remote *remote,
struct ref *ref)
{
int i;
/* Find an explicit --<option>=<name>[:<value>] entry */
for (i = 0; i < cas->nr; i++) {
struct push_cas *entry = &cas->entry[i];
if (!refname_match(entry->refname, ref->name))
continue;
ref->expect_old_sha1 = 1;
if (!entry->use_tracking)
hashcpy(ref->old_oid_expect.hash, cas->entry[i].expect);
else if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
ref->expect_old_no_trackback = 1;
return;
}
/* Are we using "--<option>" to cover all? */
if (!cas->use_tracking_for_rest)
return;
ref->expect_old_sha1 = 1;
if (remote_tracking(remote, ref->name, &ref->old_oid_expect))
ref->expect_old_no_trackback = 1;
}
void apply_push_cas(struct push_cas_option *cas,
struct remote *remote,
struct ref *remote_refs)
{
struct ref *ref;
for (ref = remote_refs; ref; ref = ref->next)
apply_cas(cas, remote, ref);
}