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#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"
enum map_direction { FROM_SRC, FROM_DST };
static struct refspec s_tag_refspec = {
0,
1,
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 branch **branches;
static int branches_alloc;
static int branches_nr;
static struct branch *current_branch;
static const char *default_remote_name;
static int explicit_default_remote_name;
static struct rewrites rewrites;
static struct rewrites rewrites_push;
#define BUF_SIZE (2048)
static char buffer[BUF_SIZE];
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;
char *ret;
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 (!prefixcmp(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;
ret = xmalloc(r->rewrite[longest_i]->baselen +
(strlen(url) - longest->len) + 1);
strcpy(ret, r->rewrite[longest_i]->base);
strcpy(ret + r->rewrite[longest_i]->baselen, url + longest->len);
return ret;
}
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);
}
static struct remote *make_remote(const char *name, int len)
{
struct remote *ret;
int i;
for (i = 0; i < remotes_nr; i++) {
if (len ? (!strncmp(name, remotes[i]->name, len) &&
!remotes[i]->name[len]) :
!strcmp(name, remotes[i]->name))
return remotes[i];
}
ret = xcalloc(1, sizeof(struct remote));
ALLOC_GROW(remotes, remotes_nr + 1, remotes_alloc);
remotes[remotes_nr++] = ret;
if (len)
ret->name = xstrndup(name, len);
else
ret->name = xstrdup(name);
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;
char *refname;
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);
refname = xmalloc(strlen(name) + strlen("refs/heads/") + 1);
strcpy(refname, "refs/heads/");
strcpy(refname + strlen("refs/heads/"), ret->name);
ret->refname = refname;
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 void read_remotes_file(struct remote *remote)
{
FILE *f = fopen(git_path("remotes/%s", remote->name), "r");
if (!f)
return;
remote->origin = REMOTE_REMOTES;
while (fgets(buffer, BUF_SIZE, f)) {
int value_list;
char *s, *p;
if (!prefixcmp(buffer, "URL:")) {
value_list = 0;
s = buffer + 4;
} else if (!prefixcmp(buffer, "Push:")) {
value_list = 1;
s = buffer + 5;
} else if (!prefixcmp(buffer, "Pull:")) {
value_list = 2;
s = buffer + 5;
} else
continue;
while (isspace(*s))
s++;
if (!*s)
continue;
p = s + strlen(s);
while (isspace(p[-1]))
*--p = 0;
switch (value_list) {
case 0:
add_url_alias(remote, xstrdup(s));
break;
case 1:
add_push_refspec(remote, xstrdup(s));
break;
case 2:
add_fetch_refspec(remote, xstrdup(s));
break;
}
}
fclose(f);
}
static void read_branches_file(struct remote *remote)
{
const char *slash = strchr(remote->name, '/');
char *frag;
struct strbuf branch = STRBUF_INIT;
int n = slash ? slash - remote->name : 1000;
FILE *f = fopen(git_path("branches/%.*s", n, remote->name), "r");
char *s, *p;
int len;
if (!f)
return;
s = fgets(buffer, BUF_SIZE, f);
fclose(f);
if (!s)
return;
while (isspace(*s))
s++;
if (!*s)
return;
remote->origin = REMOTE_BRANCHES;
p = s + strlen(s);
while (isspace(p[-1]))
*--p = 0;
len = p - s;
if (slash)
len += strlen(slash);
p = xmalloc(len + 1);
strcpy(p, s);
if (slash)
strcat(p, slash);
/*
* With "slash", e.g. "git fetch jgarzik/netdev-2.6" when
* reading from $GIT_DIR/branches/jgarzik fetches "HEAD" from
* the partial URL obtained from the branches file plus
* "/netdev-2.6" and does not store it in any tracking ref.
* #branch specifier in the file is ignored.
*
* Otherwise, the branches file would have URL and optionally
* #branch specified. The "master" (or specified) branch is
* fetched and stored in the local branch of the same name.
*/
frag = strchr(p, '#');
if (frag) {
*(frag++) = '\0';
strbuf_addf(&branch, "refs/heads/%s", frag);
} else
strbuf_addstr(&branch, "refs/heads/master");
if (!slash) {
strbuf_addf(&branch, ":refs/heads/%s", remote->name);
} else {
strbuf_reset(&branch);
strbuf_addstr(&branch, "HEAD:");
}
add_url_alias(remote, p);
add_fetch_refspec(remote, strbuf_detach(&branch, NULL));
/*
* Cogito compatible push: push current HEAD to remote #branch
* (master if missing)
*/
strbuf_init(&branch, 0);
strbuf_addstr(&branch, "HEAD");
if (frag)
strbuf_addf(&branch, ":refs/heads/%s", frag);
else
strbuf_addstr(&branch, ":refs/heads/master");
add_push_refspec(remote, strbuf_detach(&branch, NULL));
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 (!prefixcmp(key, "branch.")) {
name = key + 7;
subkey = strrchr(name, '.');
if (!subkey)
return 0;
branch = make_branch(name, subkey - name);
if (!strcmp(subkey, ".remote")) {
if (!value)
return config_error_nonbool(key);
branch->remote_name = xstrdup(value);
if (branch == current_branch) {
default_remote_name = branch->remote_name;
explicit_default_remote_name = 1;
}
} else if (!strcmp(subkey, ".merge")) {
if (!value)
return config_error_nonbool(key);
add_merge(branch, xstrdup(value));
}
return 0;
}
if (!prefixcmp(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 (prefixcmp(key, "remote."))
return 0;
name = key + 7;
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, ".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)
{
unsigned char sha1[20];
const char *head_ref;
int flag;
if (default_remote_name) /* did this already */
return;
default_remote_name = xstrdup("origin");
current_branch = NULL;
head_ref = resolve_ref_unsafe("HEAD", sha1, 0, &flag);
if (head_ref && (flag & REF_ISSYMREF) &&
!prefixcmp(head_ref, "refs/heads/")) {
current_branch =
make_branch(head_ref + strlen("refs/heads/"), 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(sizeof(*rs), nr_refspec);
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 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) {
/*
* LHS
* - empty is allowed; it means HEAD.
* - otherwise it must be a valid looking ref.
*/
if (!*rs[i].src)
; /* empty is ok */
else if (check_refname_format(rs[i].src, flags))
goto invalid;
/*
* RHS
* - missing is ok, and is same as empty.
* - empty is ok; it means not to store.
* - otherwise it must be a valid looking ref.
*/
if (!rs[i].dst)
; /* ok */
else if (!*rs[i].dst)
; /* ok */
else if (check_refname_format(rs[i].dst, flags))
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 */
}
struct remote *remote_get(const char *name)
{
struct remote *ret;
int name_given = 0;
read_config();
if (name)
name_given = 1;
else {
name = default_remote_name;
name_given = explicit_default_remote_name;
}
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;
}
int remote_is_configured(const char *name)
{
int i;
read_config();
for (i = 0; i < remotes_nr; i++)
if (!strcmp(name, remotes[i]->name))
return 1;
return 0;
}
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;
}
void ref_remove_duplicates(struct ref *ref_map)
{
struct string_list refs = STRING_LIST_INIT_NODUP;
struct string_list_item *item = NULL;
struct ref *prev = NULL, *next = NULL;
for (; ref_map; prev = ref_map, ref_map = next) {
next = ref_map->next;
if (!ref_map->peer_ref)
continue;
item = string_list_lookup(&refs, ref_map->peer_ref->name);
if (item) {
if (strcmp(((struct ref *)item->util)->name,
ref_map->name))
die("%s tracks both %s and %s",
ref_map->peer_ref->name,
((struct ref *)item->util)->name,
ref_map->name);
prev->next = ref_map->next;
free(ref_map->peer_ref);
free(ref_map);
ref_map = prev; /* skip this; we freed it */
continue;
}
item = string_list_insert(&refs, ref_map->peer_ref->name);
item->util = ref_map;
}
string_list_clear(&refs, 0);
}
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) {
const char *vstar = strchr(value, '*');
size_t vlen;
size_t vsuffixlen;
if (!vstar)
die("Value '%s' of pattern has no '*'", value);
vlen = vstar - value;
vsuffixlen = strlen(vstar + 1);
*result = xmalloc(vlen + vsuffixlen +
strlen(name) -
klen - ksuffixlen + 1);
strncpy(*result, value, vlen);
strncpy(*result + vlen,
name + klen, namelen - klen - ksuffixlen);
strcpy(*result + vlen + namelen - klen - ksuffixlen,
vstar + 1);
}
return ret;
}
static int query_refspecs(struct refspec *refs, int ref_count, struct refspec *query)
{
int i;
int find_src = !query->src;
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;
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)) {
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, sizeof(struct 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 = strlen(ref->name);
cpy = xmalloc(sizeof(struct ref) + len + 1);
memcpy(cpy, ref, sizeof(struct ref) + len + 1);
cpy->next = NULL;
cpy->symref = ref->symref ? xstrdup(ref->symref) : NULL;
cpy->remote_status = ref->remote_status ? xstrdup(ref->remote_status) : NULL;
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);
}
static 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, ref_rev_parse_rules))
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 &&
prefixcmp(name, "refs/heads/") &&
prefixcmp(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) {
*matched_ref = matched_weak;
return weak_match;
}
else {
*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)");
hashclr(ref->new_sha1);
return ref;
}
static struct ref *try_explicit_object_name(const char *name)
{
unsigned char sha1[20];
struct ref *ref;
if (!*name)
return alloc_delete_ref();
if (get_sha1(name, sha1))
return NULL;
ref = alloc_ref(name);
hashcpy(ref->new_sha1, sha1);
return ref;
}
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;
unsigned char sha1[20];
const char *r = resolve_ref_unsafe(peer->name, sha1, 1, NULL);
if (!r)
return NULL;
if (!prefixcmp(r, "refs/heads/"))
strbuf_addstr(&buf, "refs/heads/");
else if (!prefixcmp(r, "refs/tags/"))
strbuf_addstr(&buf, "refs/tags/");
else
return NULL;
strbuf_addstr(&buf, name);
return strbuf_detach(&buf, NULL);
}
static int match_explicit(struct ref *src, struct ref *dst,
struct ref ***dst_tail,
struct refspec *rs)
{
struct ref *matched_src, *matched_dst;
int copy_src;
const char *dst_value = rs->dst;
char *dst_guess;
if (rs->pattern || rs->matching)
return 0;
matched_src = matched_dst = NULL;
switch (count_refspec_match(rs->src, src, &matched_src)) {
case 1:
copy_src = 1;
break;
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.
*/
matched_src = try_explicit_object_name(rs->src);
if (!matched_src)
return error("src refspec %s does not match any.", rs->src);
copy_src = 0;
break;
default:
return error("src refspec %s matches more than one.", rs->src);
}
if (!dst_value) {
unsigned char sha1[20];
int flag;
dst_value = resolve_ref_unsafe(matched_src->name, sha1, 1, &flag);
if (!dst_value ||
((flag & REF_ISSYMREF) &&
prefixcmp(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 (!memcmp(dst_value, "refs/", 5))
matched_dst = make_linked_ref(dst_value, dst_tail);
else if (is_null_sha1(matched_src->new_sha1))
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 = copy_src ? copy_ref(matched_src) : 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 && prefixcmp(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;
}
/*
* 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);
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 ref *dst_peer;
const struct refspec *pat = NULL;
char *dst_name;
if (ref->peer_ref)
continue;
dst_name = get_ref_match(rs, nr_refspec, ref, send_mirror, FROM_SRC, &pat);
if (!dst_name)
continue;
dst_peer = find_ref_by_name(*dst, dst_name);
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 nor --mirror.
*/
goto free_name;
/* Create a new one and link it */
dst_peer = make_linked_ref(dst_name, &dst_tail);
hashcpy(dst_peer->new_sha1, ref->new_sha1);
}
dst_peer->peer_ref = copy_ref(ref);
dst_peer->force = pat->force;
free_name:
free(dst_name);
}
if (send_prune) {
/* 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 (!find_ref_by_name(src, src_name))
ref->peer_ref = alloc_delete_ref();
free(src_name);
}
}
}
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) {
if (ref->peer_ref)
hashcpy(ref->new_sha1, ref->peer_ref->new_sha1);
else if (!send_mirror)
continue;
ref->deletion = is_null_sha1(ref->new_sha1);
if (!ref->deletion &&
!hashcmp(ref->old_sha1, ref->new_sha1)) {
ref->status = REF_STATUS_UPTODATE;
continue;
}
/* This part determines what can overwrite what.
* The rules are:
*
* (0) you can always use --force or +A:B notation to
* selectively force individual ref pairs.
*
* (1) if the old thing does not exist, it is OK.
*
* (2) if you do not have the old thing, you are not allowed
* to overwrite it; you would not know what you are losing
* otherwise.
*
* (3) if both new and old are commit-ish, and new is a
* descendant of old, it is OK.
*
* (4) regardless of all of the above, removing :B is
* always allowed.
*/
ref->nonfastforward =
!ref->deletion &&
!is_null_sha1(ref->old_sha1) &&
(!has_sha1_file(ref->old_sha1)
|| !ref_newer(ref->new_sha1, ref->old_sha1));
if (ref->nonfastforward && !ref->force && !force_update) {
ref->status = REF_STATUS_REJECT_NONFASTFORWARD;
continue;
}
}
}
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);
if (ret && ret->remote_name) {
ret->remote = remote_get(ret->remote_name);
if (ret->merge_nr) {
int i;
ret->merge = xcalloc(sizeof(*ret->merge),
ret->merge_nr);
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(ret->remote, ret->merge[i])
&& !strcmp(ret->remote_name, "."))
ret->merge[i]->dst = xstrdup(ret->merge_name[i]);
}
}
}
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, ref_fetch_rules);
}
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;
char *expn_name;
for (ref = remote_refs; ref; ref = ref->next) {
if (strchr(ref->name, '^'))
continue; /* a dereference item */
if (match_name_with_pattern(refspec->src, ref->name,
refspec->dst, &expn_name)) {
struct ref *cpy = copy_ref(ref);
cpy->peer_ref = alloc_ref(expn_name);
free(expn_name);
if (refspec->force)
cpy->peer_ref->force = 1;
*tail = cpy;
tail = &cpy->next;
}
}
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, ref_fetch_rules))
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 (!prefixcmp(name, "refs/"))
return alloc_ref(name);
if (!prefixcmp(name, "heads/") ||
!prefixcmp(name, "tags/") ||
!prefixcmp(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";
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 (check_refname_format((*rmp)->peer_ref->name + 5,
REFNAME_ALLOW_ONELEVEL)) {
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)) {
hashcpy(ref->old_sha1, list->old_sha1);
return 0;
}
return 1;
}
static void unmark_and_free(struct commit_list *list, unsigned int mark)
{
while (list) {
struct commit_list *temp = list;
temp->item->object.flags &= ~mark;
list = temp->next;
free(temp);
}
}
int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha1)
{
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_sha1), NULL, 0);
if (!o || o->type != OBJ_COMMIT)
return 0;
old = (struct commit *) o;
o = deref_tag(parse_object(new_sha1), 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;
}
/*
* Return true if there is anything to report, otherwise false.
*/
int stat_tracking_info(struct branch *branch, int *num_ours, int *num_theirs)
{
unsigned char sha1[20];
struct commit *ours, *theirs;
char symmetric[84];
struct rev_info revs;
const char *rev_argv[10], *base;
int rev_argc;
/*
* Nothing to report unless we are marked to build on top of
* somebody else.
*/
if (!branch ||
!branch->merge || !branch->merge[0] || !branch->merge[0]->dst)
return 0;
/*
* If what we used to build on no longer exists, there is
* nothing to report.
*/
base = branch->merge[0]->dst;
if (read_ref(base, sha1))
return 0;
theirs = lookup_commit_reference(sha1);
if (!theirs)
return 0;
if (read_ref(branch->refname, sha1))
return 0;
ours = lookup_commit_reference(sha1);
if (!ours)
return 0;
/* are we the same? */
if (theirs == ours)
return 0;
/* Run "rev-list --left-right ours...theirs" internally... */
rev_argc = 0;
rev_argv[rev_argc++] = NULL;
rev_argv[rev_argc++] = "--left-right";
rev_argv[rev_argc++] = symmetric;
rev_argv[rev_argc++] = "--";
rev_argv[rev_argc] = NULL;
strcpy(symmetric, sha1_to_hex(ours->object.sha1));
strcpy(symmetric + 40, "...");
strcpy(symmetric + 43, sha1_to_hex(theirs->object.sha1));
init_revisions(&revs, NULL);
setup_revisions(rev_argc, rev_argv, &revs, NULL);
prepare_revision_walk(&revs);
/* ... 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);
return 1;
}
/*
* Return true when there is anything to report, otherwise false.
*/
int format_tracking_info(struct branch *branch, struct strbuf *sb)
{
int num_ours, num_theirs;
const char *base;
if (!stat_tracking_info(branch, &num_ours, &num_theirs))
return 0;
base = branch->merge[0]->dst;
base = shorten_unambiguous_ref(base, 0);
if (!num_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",
num_ours),
base, num_ours);
else if (!num_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",
num_theirs),
base, num_theirs);
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",
num_theirs),
base, num_ours, num_theirs);
return 1;
}
static int one_local_ref(const char *refname, const unsigned char *sha1, int flag, void *cb_data)
{
struct ref ***local_tail = cb_data;
struct ref *ref;
int len;
/* we already know it starts with refs/ to get here */
if (check_refname_format(refname + 5, 0))
return 0;
len = strlen(refname) + 1;
ref = xcalloc(1, sizeof(*ref) + len);
hashcpy(ref->new_sha1, sha1);
memcpy(ref->name, refname, len);
**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 && !hashcmp(r->old_sha1, head->old_sha1))
return copy_ref(r);
}
/* Look for another ref that points there */
for (r = refs; r; r = r->next) {
if (r != head &&
!prefixcmp(r->name, "refs/heads/") &&
!hashcmp(r->old_sha1, head->old_sha1)) {
*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 unsigned char *sha1, int flags, void *cb_data)
{
struct stale_heads_info *info = cb_data;
struct refspec query;
memset(&query, 0, sizeof(struct refspec));
query.dst = (char *)refname;
if (query_refspecs(info->refs, info->ref_count, &query))
return 0; /* 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.
*/
if (!((flags & REF_ISSYMREF) ||
string_list_has_string(info->ref_names, query.src))) {
struct ref *ref = make_linked_ref(refname, &info->stale_refs_tail);
hashcpy(ref->new_sha1, sha1);
}
free(query.src);
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);
sort_string_list(&ref_names);
for_each_ref(get_stale_heads_cb, &info);
string_list_clear(&ref_names, 0);
return stale_refs;
}
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