/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "git2/errors.h"
#include "common.h"
#include "refspec.h"
#include "util.h"
#include "posix.h"
#include "refs.h"
#include "vector.h"
int git_refspec__parse(git_refspec *refspec, const char *input, bool is_fetch)
{
// Ported from https://github.com/git/git/blob/f06d47e7e0d9db709ee204ed13a8a7486149f494/remote.c#L518-636
size_t llen;
int is_glob = 0;
const char *lhs, *rhs;
int flags;
assert(refspec && input);
memset(refspec, 0x0, sizeof(git_refspec));
refspec->push = !is_fetch;
lhs = input;
if (*lhs == '+') {
refspec->force = 1;
lhs++;
}
rhs = strrchr(lhs, ':');
/*
* Before going on, special case ":" (or "+:") as a refspec
* for matching refs.
*/
if (!is_fetch && rhs == lhs && rhs[1] == '\0') {
refspec->matching = 1;
refspec->string = git__strdup(input);
GITERR_CHECK_ALLOC(refspec->string);
refspec->src = git__strdup("");
GITERR_CHECK_ALLOC(refspec->src);
refspec->dst = git__strdup("");
GITERR_CHECK_ALLOC(refspec->dst);
return 0;
}
if (rhs) {
size_t rlen = strlen(++rhs);
if (rlen || !is_fetch) {
is_glob = (1 <= rlen && strchr(rhs, '*'));
refspec->dst = git__strndup(rhs, rlen);
}
}
llen = (rhs ? (size_t)(rhs - lhs - 1) : strlen(lhs));
if (1 <= llen && memchr(lhs, '*', llen)) {
if ((rhs && !is_glob) || (!rhs && is_fetch))
goto invalid;
is_glob = 1;
} else if (rhs && is_glob)
goto invalid;
refspec->pattern = is_glob;
refspec->src = git__strndup(lhs, llen);
flags = GIT_REF_FORMAT_ALLOW_ONELEVEL | GIT_REF_FORMAT_REFSPEC_SHORTHAND
| (is_glob ? GIT_REF_FORMAT_REFSPEC_PATTERN : 0);
if (is_fetch) {
/*
* LHS
* - empty is allowed; it means HEAD.
* - otherwise it must be a valid looking ref.
*/
if (!*refspec->src)
; /* empty is ok */
else if (!git_reference__is_valid_name(refspec->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 (!refspec->dst)
; /* ok */
else if (!*refspec->dst)
; /* ok */
else if (!git_reference__is_valid_name(refspec->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 (!*refspec->src)
; /* empty is ok */
else if (is_glob) {
if (!git_reference__is_valid_name(refspec->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 (!refspec->dst) {
if (!git_reference__is_valid_name(refspec->src, flags))
goto invalid;
} else if (!*refspec->dst) {
goto invalid;
} else {
if (!git_reference__is_valid_name(refspec->dst, flags))
goto invalid;
}
/* if the RHS is empty, then it's a copy of the LHS */
if (!refspec->dst) {
refspec->dst = git__strdup(refspec->src);
GITERR_CHECK_ALLOC(refspec->dst);
}
}
refspec->string = git__strdup(input);
GITERR_CHECK_ALLOC(refspec->string);
return 0;
invalid:
giterr_set(
GITERR_INVALID,
"'%s' is not a valid refspec.", input);
git_refspec__free(refspec);
return -1;
}
void git_refspec__free(git_refspec *refspec)
{
if (refspec == NULL)
return;
git__free(refspec->src);
git__free(refspec->dst);
git__free(refspec->string);
memset(refspec, 0x0, sizeof(git_refspec));
}
const char *git_refspec_src(const git_refspec *refspec)
{
return refspec == NULL ? NULL : refspec->src;
}
const char *git_refspec_dst(const git_refspec *refspec)
{
return refspec == NULL ? NULL : refspec->dst;
}
const char *git_refspec_string(const git_refspec *refspec)
{
return refspec == NULL ? NULL : refspec->string;
}
int git_refspec_force(const git_refspec *refspec)
{
assert(refspec);
return refspec->force;
}
int git_refspec_src_matches(const git_refspec *refspec, const char *refname)
{
if (refspec == NULL || refspec->src == NULL)
return false;
return (p_fnmatch(refspec->src, refname, 0) == 0);
}
int git_refspec_dst_matches(const git_refspec *refspec, const char *refname)
{
if (refspec == NULL || refspec->dst == NULL)
return false;
return (p_fnmatch(refspec->dst, refname, 0) == 0);
}
static int refspec_transform(
git_buf *out, const char *from, const char *to, const char *name)
{
const char *from_star, *to_star;
const char *name_slash, *from_slash;
size_t replacement_len, star_offset;
git_buf_sanitize(out);
git_buf_clear(out);
/*
* There are two parts to each side of a refspec, the bit
* before the star and the bit after it. The star can be in
* the middle of the pattern, so we need to look at each bit
* individually.
*/
from_star = strchr(from, '*');
to_star = strchr(to, '*');
assert(from_star && to_star);
/* star offset, both in 'from' and in 'name' */
star_offset = from_star - from;
/* the first half is copied over */
git_buf_put(out, to, to_star - to);
/* then we copy over the replacement, from the star's offset to the next slash in 'name' */
name_slash = strchr(name + star_offset, '/');
if (!name_slash)
name_slash = strrchr(name, '\0');
/* if there is no slash after the star in 'from', we want to copy everything over */
from_slash = strchr(from + star_offset, '/');
if (!from_slash)
name_slash = strrchr(name, '\0');
replacement_len = (name_slash - name) - star_offset;
git_buf_put(out, name + star_offset, replacement_len);
return git_buf_puts(out, to_star + 1);
}
int git_refspec_transform(git_buf *out, const git_refspec *spec, const char *name)
{
assert(out && spec && name);
git_buf_sanitize(out);
if (!git_refspec_src_matches(spec, name)) {
giterr_set(GITERR_INVALID, "ref '%s' doesn't match the source", name);
return -1;
}
if (!spec->pattern)
return git_buf_puts(out, spec->dst);
return refspec_transform(out, spec->src, spec->dst, name);
}
int git_refspec_rtransform(git_buf *out, const git_refspec *spec, const char *name)
{
assert(out && spec && name);
git_buf_sanitize(out);
if (!git_refspec_dst_matches(spec, name)) {
giterr_set(GITERR_INVALID, "ref '%s' doesn't match the destination", name);
return -1;
}
if (!spec->pattern)
return git_buf_puts(out, spec->src);
return refspec_transform(out, spec->dst, spec->src, name);
}
int git_refspec__serialize(git_buf *out, const git_refspec *refspec)
{
if (refspec->force)
git_buf_putc(out, '+');
git_buf_printf(out, "%s:%s",
refspec->src != NULL ? refspec->src : "",
refspec->dst != NULL ? refspec->dst : "");
return git_buf_oom(out) == false;
}
int git_refspec_is_wildcard(const git_refspec *spec)
{
assert(spec && spec->src);
return (spec->src[strlen(spec->src) - 1] == '*');
}
git_direction git_refspec_direction(const git_refspec *spec)
{
assert(spec);
return spec->push;
}
int git_refspec__dwim_one(git_vector *out, git_refspec *spec, git_vector *refs)
{
git_buf buf = GIT_BUF_INIT;
size_t j, pos;
git_remote_head key;
const char* formatters[] = {
GIT_REFS_DIR "%s",
GIT_REFS_TAGS_DIR "%s",
GIT_REFS_HEADS_DIR "%s",
NULL
};
git_refspec *cur = git__calloc(1, sizeof(git_refspec));
GITERR_CHECK_ALLOC(cur);
cur->force = spec->force;
cur->push = spec->push;
cur->pattern = spec->pattern;
cur->matching = spec->matching;
cur->string = git__strdup(spec->string);
/* shorthand on the lhs */
if (git__prefixcmp(spec->src, GIT_REFS_DIR)) {
for (j = 0; formatters[j]; j++) {
git_buf_clear(&buf);
git_buf_printf(&buf, formatters[j], spec->src);
GITERR_CHECK_ALLOC_BUF(&buf);
key.name = (char *) git_buf_cstr(&buf);
if (!git_vector_search(&pos, refs, &key)) {
/* we found something to match the shorthand, set src to that */
cur->src = git_buf_detach(&buf);
}
}
}
/* No shorthands found, copy over the name */
if (cur->src == NULL && spec->src != NULL) {
cur->src = git__strdup(spec->src);
GITERR_CHECK_ALLOC(cur->src);
}
if (spec->dst && git__prefixcmp(spec->dst, GIT_REFS_DIR)) {
/* if it starts with "remotes" then we just prepend "refs/" */
if (!git__prefixcmp(spec->dst, "remotes/")) {
git_buf_puts(&buf, GIT_REFS_DIR);
} else {
git_buf_puts(&buf, GIT_REFS_HEADS_DIR);
}
git_buf_puts(&buf, spec->dst);
GITERR_CHECK_ALLOC_BUF(&buf);
cur->dst = git_buf_detach(&buf);
}
git_buf_free(&buf);
if (cur->dst == NULL && spec->dst != NULL) {
cur->dst = git__strdup(spec->dst);
GITERR_CHECK_ALLOC(cur->dst);
}
return git_vector_insert(out, cur);
}