diff options
Diffstat (limited to 'src/libgit2/refspec.c')
| -rw-r--r-- | src/libgit2/refspec.c | 420 |
1 files changed, 420 insertions, 0 deletions
diff --git a/src/libgit2/refspec.c b/src/libgit2/refspec.c new file mode 100644 index 000000000..f0a0c2bfb --- /dev/null +++ b/src/libgit2/refspec.c @@ -0,0 +1,420 @@ +/* + * 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 "refspec.h" + +#include "buf.h" +#include "refs.h" +#include "util.h" +#include "vector.h" +#include "wildmatch.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 valid = 0; + unsigned int flags; + + GIT_ASSERT_ARG(refspec); + GIT_ASSERT_ARG(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); + GIT_ERROR_CHECK_ALLOC(refspec->string); + refspec->src = git__strdup(""); + GIT_ERROR_CHECK_ALLOC(refspec->src); + refspec->dst = git__strdup(""); + GIT_ERROR_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_REFERENCE_FORMAT_ALLOW_ONELEVEL | + GIT_REFERENCE_FORMAT_REFSPEC_SHORTHAND | + (is_glob ? GIT_REFERENCE_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__name_is_valid(&valid, refspec->src, flags) < 0) + goto on_error; + else if (!valid) + 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__name_is_valid(&valid, refspec->dst, flags) < 0) + goto on_error; + else if (!valid) + 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__name_is_valid(&valid, refspec->src, flags) < 0) + goto on_error; + else if (!valid) + 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__name_is_valid(&valid, refspec->src, flags) < 0) + goto on_error; + else if (!valid) + goto invalid; + } else if (!*refspec->dst) { + goto invalid; + } else { + if (git_reference__name_is_valid(&valid, refspec->dst, flags) < 0) + goto on_error; + else if (!valid) + goto invalid; + } + + /* if the RHS is empty, then it's a copy of the LHS */ + if (!refspec->dst) { + refspec->dst = git__strdup(refspec->src); + GIT_ERROR_CHECK_ALLOC(refspec->dst); + } + } + + refspec->string = git__strdup(input); + GIT_ERROR_CHECK_ALLOC(refspec->string); + + return 0; + +invalid: + git_error_set(GIT_ERROR_INVALID, + "'%s' is not a valid refspec.", input); + git_refspec__dispose(refspec); + return GIT_EINVALIDSPEC; + +on_error: + git_refspec__dispose(refspec); + return -1; +} + +void git_refspec__dispose(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)); +} + +int git_refspec_parse(git_refspec **out_refspec, const char *input, int is_fetch) +{ + git_refspec *refspec; + GIT_ASSERT_ARG(out_refspec); + GIT_ASSERT_ARG(input); + + *out_refspec = NULL; + + refspec = git__malloc(sizeof(git_refspec)); + GIT_ERROR_CHECK_ALLOC(refspec); + + if (git_refspec__parse(refspec, input, !!is_fetch) != 0) { + git__free(refspec); + return -1; + } + + *out_refspec = refspec; + return 0; +} + +void git_refspec_free(git_refspec *refspec) +{ + git_refspec__dispose(refspec); + git__free(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) +{ + GIT_ASSERT_ARG(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 (wildmatch(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 (wildmatch(refspec->dst, refname, 0) == 0); +} + +static int refspec_transform( + git_str *out, const char *from, const char *to, const char *name) +{ + const char *from_star, *to_star; + size_t replacement_len, star_offset; + + git_str_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, '*'); + + GIT_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_str_put(out, to, to_star - to); + + /* + * Copy over the name, but exclude the trailing part in "from" starting + * after the glob + */ + replacement_len = strlen(name + star_offset) - strlen(from_star + 1); + git_str_put(out, name + star_offset, replacement_len); + + return git_str_puts(out, to_star + 1); +} + +int git_refspec_transform(git_buf *out, const git_refspec *spec, const char *name) +{ + GIT_BUF_WRAP_PRIVATE(out, git_refspec__transform, spec, name); +} + +int git_refspec__transform(git_str *out, const git_refspec *spec, const char *name) +{ + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(spec); + GIT_ASSERT_ARG(name); + + if (!git_refspec_src_matches(spec, name)) { + git_error_set(GIT_ERROR_INVALID, "ref '%s' doesn't match the source", name); + return -1; + } + + if (!spec->pattern) + return git_str_puts(out, spec->dst ? 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) +{ + GIT_BUF_WRAP_PRIVATE(out, git_refspec__rtransform, spec, name); +} + +int git_refspec__rtransform(git_str *out, const git_refspec *spec, const char *name) +{ + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(spec); + GIT_ASSERT_ARG(name); + + if (!git_refspec_dst_matches(spec, name)) { + git_error_set(GIT_ERROR_INVALID, "ref '%s' doesn't match the destination", name); + return -1; + } + + if (!spec->pattern) + return git_str_puts(out, spec->src); + + return refspec_transform(out, spec->dst, spec->src, name); +} + +int git_refspec__serialize(git_str *out, const git_refspec *refspec) +{ + if (refspec->force) + git_str_putc(out, '+'); + + git_str_printf(out, "%s:%s", + refspec->src != NULL ? refspec->src : "", + refspec->dst != NULL ? refspec->dst : ""); + + return git_str_oom(out) == false; +} + +int git_refspec_is_wildcard(const git_refspec *spec) +{ + GIT_ASSERT_ARG(spec); + GIT_ASSERT_ARG(spec->src); + + return (spec->src[strlen(spec->src) - 1] == '*'); +} + +git_direction git_refspec_direction(const git_refspec *spec) +{ + GIT_ASSERT_ARG(spec); + + return spec->push; +} + +int git_refspec__dwim_one(git_vector *out, git_refspec *spec, git_vector *refs) +{ + git_str buf = GIT_STR_INIT; + size_t j, pos; + git_remote_head key; + git_refspec *cur; + + const char *formatters[] = { + GIT_REFS_DIR "%s", + GIT_REFS_TAGS_DIR "%s", + GIT_REFS_HEADS_DIR "%s", + NULL + }; + + GIT_ASSERT_ARG(out); + GIT_ASSERT_ARG(spec); + GIT_ASSERT_ARG(refs); + + cur = git__calloc(1, sizeof(git_refspec)); + GIT_ERROR_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_str_clear(&buf); + git_str_printf(&buf, formatters[j], spec->src); + GIT_ERROR_CHECK_ALLOC_STR(&buf); + + key.name = (char *) git_str_cstr(&buf); + if (!git_vector_search(&pos, refs, &key)) { + /* we found something to match the shorthand, set src to that */ + cur->src = git_str_detach(&buf); + } + } + } + + /* No shorthands found, copy over the name */ + if (cur->src == NULL && spec->src != NULL) { + cur->src = git__strdup(spec->src); + GIT_ERROR_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_str_puts(&buf, GIT_REFS_DIR); + } else { + git_str_puts(&buf, GIT_REFS_HEADS_DIR); + } + + git_str_puts(&buf, spec->dst); + GIT_ERROR_CHECK_ALLOC_STR(&buf); + + cur->dst = git_str_detach(&buf); + } + + git_str_dispose(&buf); + + if (cur->dst == NULL && spec->dst != NULL) { + cur->dst = git__strdup(spec->dst); + GIT_ERROR_CHECK_ALLOC(cur->dst); + } + + return git_vector_insert(out, cur); +} |