thodg/libgit2/src/libgit2/refspec.c

• Show log

  Commit

• Hash : ef4ab298
  Author :
  Date : 2021-11-14T08:47:40
  

  refactor: `src` is now `src/libgit2`
  

Download

• src/libgit2/refspec.c

• /*
   * 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);
  }
  

Download