thodg/libgit2/src/tag.c

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• Hash : 97769280
  Author :
  Date : 2011-11-30T11:27:15
  

  Use git_buf for path storage instead of stack-based buffers This converts virtually all of the places that allocate GIT_PATH_MAX buffers on the stack for manipulating paths to use git_buf objects instead. The patch is pretty careful not to touch the public API for libgit2, so there are a few places that still use GIT_PATH_MAX. This extends and changes some details of the git_buf implementation to add a couple of extra functions and to make error handling easier. This includes serious alterations to all the path.c functions, and several of the fileops.c ones, too. Also, there are a number of new functions that parallel existing ones except that use a git_buf instead of a stack-based buffer (such as git_config_find_global_r that exists alongsize git_config_find_global). This also modifies the win32 version of p_realpath to allocate whatever buffer size is needed to accommodate the realpath instead of hardcoding a GIT_PATH_MAX limit, but that change needs to be tested still.

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• src/tag.c

• /*
   * Copyright (C) 2009-2011 the libgit2 contributors
   *
   * 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 "common.h"
  #include "commit.h"
  #include "tag.h"
  #include "signature.h"
  #include "git2/object.h"
  #include "git2/repository.h"
  #include "git2/signature.h"
  
  void git_tag__free(git_tag *tag)
  {
  	git_signature_free(tag->tagger);
  	git__free(tag->message);
  	git__free(tag->tag_name);
  	git__free(tag);
  }
  
  const git_oid *git_tag_id(git_tag *c)
  {
  	return git_object_id((git_object *)c);
  }
  
  int git_tag_target(git_object **target, git_tag *t)
  {
  	assert(t);
  	return git_object_lookup(target, t->object.repo, &t->target, t->type);
  }
  
  const git_oid *git_tag_target_oid(git_tag *t)
  {
  	assert(t);
  	return &t->target;
  }
  
  git_otype git_tag_type(git_tag *t)
  {
  	assert(t);
  	return t->type;
  }
  
  const char *git_tag_name(git_tag *t)
  {
  	assert(t);
  	return t->tag_name;
  }
  
  const git_signature *git_tag_tagger(git_tag *t)
  {
  	return t->tagger;
  }
  
  const char *git_tag_message(git_tag *t)
  {
  	assert(t);
  	return t->message;
  }
  
  static int parse_tag_buffer(git_tag *tag, const char *buffer, const char *buffer_end)
  {
  	static const char *tag_types[] = {
  		NULL, "commit\n", "tree\n", "blob\n", "tag\n"
  	};
  
  	unsigned int i, text_len;
  	char *search;
  	int error;
  
  	if ((error = git_oid__parse(&tag->target, &buffer, buffer_end, "object ")) < 0)
  		return git__rethrow(error, "Failed to parse tag. Object field invalid");
  
  	if (buffer + 5 >= buffer_end)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
  
  	if (memcmp(buffer, "type ", 5) != 0)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Type field not found");
  	buffer += 5;
  
  	tag->type = GIT_OBJ_BAD;
  
  	for (i = 1; i < ARRAY_SIZE(tag_types); ++i) {
  		size_t type_length = strlen(tag_types[i]);
  
  		if (buffer + type_length >= buffer_end)
  			return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
  
  		if (memcmp(buffer, tag_types[i], type_length) == 0) {
  			tag->type = i;
  			buffer += type_length;
  			break;
  		}
  	}
  
  	if (tag->type == GIT_OBJ_BAD)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Invalid object type");
  
  	if (buffer + 4 >= buffer_end)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
  
  	if (memcmp(buffer, "tag ", 4) != 0)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Tag field not found");
  
  	buffer += 4;
  
  	search = memchr(buffer, '\n', buffer_end - buffer);
  	if (search == NULL)
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. Object too short");
  
  	text_len = search - buffer;
  
  	tag->tag_name = git__malloc(text_len + 1);
  	if (tag->tag_name == NULL)
  		return GIT_ENOMEM;
  
  	memcpy(tag->tag_name, buffer, text_len);
  	tag->tag_name[text_len] = '\0';
  
  	buffer = search + 1;
  
  	tag->tagger = NULL;
  	if (*buffer != '\n') {
  		tag->tagger = git__malloc(sizeof(git_signature));
  		if (tag->tagger == NULL)
  			return GIT_ENOMEM;
  
  		if ((error = git_signature__parse(tag->tagger, &buffer, buffer_end, "tagger ", '\n') != 0)) {
  			return git__rethrow(error, "Failed to parse tag");
  		}
  	}
  
  	if( *buffer != '\n' )
  		return git__throw(GIT_EOBJCORRUPTED, "Failed to parse tag. No new line before message");
  
  	text_len = buffer_end - ++buffer;
  
  	tag->message = git__malloc(text_len + 1);
  	if (tag->message == NULL)
  		return GIT_ENOMEM;
  
  	memcpy(tag->message, buffer, text_len);
  	tag->message[text_len] = '\0';
  
  	return GIT_SUCCESS;
  }
  
  static int retrieve_tag_reference(
  	git_reference **tag_reference_out,
  	git_buf *ref_name_out,
  	git_repository *repo,
  	const char *tag_name)
  {
  	git_reference *tag_ref;
  	int error;
  
  	*tag_reference_out = NULL;
  
  	error = git_buf_joinpath(ref_name_out, GIT_REFS_TAGS_DIR, tag_name);
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to retrieve tag reference");
  
  	error = git_reference_lookup(&tag_ref, repo, ref_name_out->ptr);
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to retrieve tag reference");
  
  	*tag_reference_out = tag_ref;
  
  	return GIT_SUCCESS;
  }
  
  static int write_tag_annotation(
  		git_oid *oid,
  		git_repository *repo,
  		const char *tag_name,
  		const git_object *target,
  		const git_signature *tagger,
  		const char *message)
  {
  	int error = GIT_SUCCESS;
  	git_buf tag = GIT_BUF_INIT;
  	git_odb *odb;
  
  	git_oid__writebuf(&tag, "object ", git_object_id(target));
  	git_buf_printf(&tag, "type %s\n", git_object_type2string(git_object_type(target)));
  	git_buf_printf(&tag, "tag %s\n", tag_name);
  	git_signature__writebuf(&tag, "tagger ", tagger);
  	git_buf_putc(&tag, '\n');
  	git_buf_puts(&tag, message);
  
  	error = git_buf_lasterror(&tag);
  	if (error < GIT_SUCCESS) {
  		git_buf_free(&tag);
  		return git__rethrow(error, "Not enough memory to build the tag data");
  	}
  
  	error = git_repository_odb__weakptr(&odb, repo);
  	if (error < GIT_SUCCESS) {
  		git_buf_free(&tag);
  		return error;
  	}
  
  	error = git_odb_write(oid, odb, tag.ptr, tag.size, GIT_OBJ_TAG);
  	git_buf_free(&tag);
  
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to create tag annotation");
  
  	return error;
  }
  
  static int git_tag_create__internal(
  		git_oid *oid,
  		git_repository *repo,
  		const char *tag_name,
  		const git_object *target,
  		const git_signature *tagger,
  		const char *message,
  		int allow_ref_overwrite,
  		int create_tag_annotation)
  {
  	git_reference *new_ref = NULL;
  	git_buf ref_name = GIT_BUF_INIT;
  
  	int error, should_update_ref = 0;
  	const char *errmsg = "Failed to create tag";
  
  	assert(repo && tag_name && target);
  	assert(!create_tag_annotation || (tagger && message));
  
  	if (git_object_owner(target) != repo)
  		return git__throw(GIT_EINVALIDARGS,
  			"The given target does not belong to this repository");
  
  	error = retrieve_tag_reference(&new_ref, &ref_name, repo, tag_name);
  	if (error < GIT_SUCCESS && error != GIT_ENOTFOUND)
  		goto cleanup;
  
  	/** Ensure the tag name doesn't conflict with an already existing
  	 *	reference unless overwriting has explictly been requested **/
  	if (new_ref != NULL) {
  		if (!allow_ref_overwrite) {
  			git_oid_cpy(oid, git_reference_oid(new_ref));
  			error = GIT_EEXISTS;
  			errmsg = "Tag already exists";
  			goto cleanup;
  		} else {
  			should_update_ref = 1;
  		}
  	}
  
  	if (create_tag_annotation) {
  		if ((error = write_tag_annotation(oid, repo, tag_name, target, tagger, message)) < GIT_SUCCESS)
  			goto cleanup;
  	} else
  		git_oid_cpy(oid, git_object_id(target));
  
  	if (!should_update_ref)
  		error = git_reference_create_oid(&new_ref, repo, ref_name.ptr, oid, 0);
  	else
  		error = git_reference_set_oid(new_ref, oid);
  
  cleanup:
  	git_reference_free(new_ref);
  	git_buf_free(&ref_name);
  
  	if (error < GIT_SUCCESS)
  		git__rethrow(error, "%s", errmsg);
  
  	return error;
  }
  
  int git_tag_create(
  		git_oid *oid,
  		git_repository *repo,
  		const char *tag_name,
  		const git_object *target,
  		const git_signature *tagger,
  		const char *message,
  		int allow_ref_overwrite)
  {
  	return git_tag_create__internal(oid, repo, tag_name, target, tagger, message, allow_ref_overwrite, 1);
  }
  
  int git_tag_create_lightweight(
  		git_oid *oid,
  		git_repository *repo,
  		const char *tag_name,
  		const git_object *target,
  		int allow_ref_overwrite)
  {
  	return git_tag_create__internal(oid, repo, tag_name, target, NULL, NULL, allow_ref_overwrite, 0);
  }
  
  int git_tag_create_frombuffer(git_oid *oid, git_repository *repo, const char *buffer, int allow_ref_overwrite)
  {
  	git_tag tag;
  	int error, should_update_ref = 0;
  	const char *errmsg = "Failed to create tag";
  	git_odb *odb;
  	git_odb_stream *stream;
  	git_odb_object *target_obj;
  
  	git_reference *new_ref = NULL;
  	git_buf ref_name = GIT_BUF_INIT;
  
  	assert(oid && buffer);
  
  	memset(&tag, 0, sizeof(tag));
  
  	error = git_repository_odb__weakptr(&odb, repo);
  	if (error < GIT_SUCCESS)
  		return error;
  
  	/* validate the buffer */
  	if ((error = parse_tag_buffer(&tag, buffer, buffer + strlen(buffer))) < GIT_SUCCESS)
  		goto cleanup;
  
  	/* validate the target */
  	if ((error = git_odb_read(&target_obj, odb, &tag.target)) < GIT_SUCCESS)
  		goto cleanup;
  
  	if (tag.type != target_obj->raw.type) {
  		error = GIT_EINVALIDTYPE;
  		errmsg = "The type for the given target is invalid";
  		goto cleanup;
  	}
  
  	git_odb_object_free(target_obj);
  
  	error = retrieve_tag_reference(&new_ref, &ref_name, repo, tag.tag_name);
  	if (error < GIT_SUCCESS && error != GIT_ENOTFOUND)
  		goto cleanup;
  
  	/** Ensure the tag name doesn't conflict with an already existing
  	 *	reference unless overwriting has explictly been requested **/
  	if (new_ref != NULL) {
  		if (!allow_ref_overwrite) {
  			git_oid_cpy(oid, git_reference_oid(new_ref));
  			error = GIT_EEXISTS;
  			errmsg = "Tag already exists";
  			goto cleanup;
  		} else {
  			should_update_ref = 1;
  		}
  	}
  
  	/* write the buffer */
  	if ((error = git_odb_open_wstream(&stream, odb, strlen(buffer), GIT_OBJ_TAG)) < GIT_SUCCESS)
  		goto cleanup;
  
  	stream->write(stream, buffer, strlen(buffer));
  
  	error = stream->finalize_write(oid, stream);
  	stream->free(stream);
  
  	if (error < GIT_SUCCESS)
  		goto cleanup;
  
  	if (!should_update_ref)
  		error = git_reference_create_oid(&new_ref, repo, ref_name.ptr, oid, 0);
  	else
  		error = git_reference_set_oid(new_ref, oid);
  
  cleanup:
  	git_reference_free(new_ref);
  	git_signature_free(tag.tagger);
  	git__free(tag.tag_name);
  	git__free(tag.message);
  	git_buf_free(&ref_name);
  
  	if (error < GIT_SUCCESS)
  		git__rethrow(error, "%s", errmsg);
  
  	return error;
  }
  
  int git_tag_delete(git_repository *repo, const char *tag_name)
  {
  	int error;
  	git_reference *tag_ref;
  	git_buf ref_name = GIT_BUF_INIT;
  
  	error = retrieve_tag_reference(&tag_ref, &ref_name, repo, tag_name);
  
  	git_buf_free(&ref_name);
  
  	if (error < GIT_SUCCESS)
  		return git__rethrow(error, "Failed to delete tag");
  
  	return git_reference_delete(tag_ref);
  }
  
  int git_tag__parse(git_tag *tag, git_odb_object *obj)
  {
  	assert(tag);
  	return parse_tag_buffer(tag, obj->raw.data, (char *)obj->raw.data + obj->raw.len);
  }
  
  typedef struct {
   git_vector *taglist;
   const char *pattern;
  } tag_filter_data;
  
  #define GIT_REFS_TAGS_DIR_LEN strlen(GIT_REFS_TAGS_DIR)
  
  static int tag_list_cb(const char *tag_name, void *payload)
  {
  	tag_filter_data *filter;
  
  	if (git__prefixcmp(tag_name, GIT_REFS_TAGS_DIR) != 0)
  		return GIT_SUCCESS;
  
  	filter = (tag_filter_data *)payload;
  	if (!*filter->pattern || p_fnmatch(filter->pattern, tag_name + GIT_REFS_TAGS_DIR_LEN, 0) == GIT_SUCCESS)
  		return git_vector_insert(filter->taglist, git__strdup(tag_name));
  
  	return GIT_SUCCESS;
  }
  
  int git_tag_list_match(git_strarray *tag_names, const char *pattern, git_repository *repo)
  {
  	int error;
  	tag_filter_data filter;
  	git_vector taglist;
  
  	assert(tag_names && repo && pattern);
  
  	if (git_vector_init(&taglist, 8, NULL) < GIT_SUCCESS)
  		return GIT_ENOMEM;
  
  	filter.taglist = &taglist;
  	filter.pattern = pattern;
  
  	error = git_reference_foreach(repo, GIT_REF_OID|GIT_REF_PACKED, &tag_list_cb, (void *)&filter);
  	if (error < GIT_SUCCESS) {
  		git_vector_free(&taglist);
  		return git__rethrow(error, "Failed to list tags");
  	}
  
  	tag_names->strings = (char **)taglist.contents;
  	tag_names->count = taglist.length;
  	return GIT_SUCCESS;
  }
  
  int git_tag_list(git_strarray *tag_names, git_repository *repo)
  {
  	return git_tag_list_match(tag_names, "", repo);
  }
  

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