thodg/libgit2/src/branch.c

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• Hash : 4ba23be1
  Author :
  Date : 2012-10-06T12:20:13
  

  branch: deploy git_branch_is_head()

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• src/branch.c

• /*
   * Copyright (C) 2009-2012 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 "config.h"
  #include "refspec.h"
  
  #include "git2/branch.h"
  
  static int retrieve_branch_reference(
  	git_reference **branch_reference_out,
  	git_repository *repo,
  	const char *branch_name,
  	int is_remote)
  {
  	git_reference *branch;
  	int error = -1;
  	char *prefix;
  	git_buf ref_name = GIT_BUF_INIT;
  
  	*branch_reference_out = NULL;
  
  	prefix = is_remote ? GIT_REFS_REMOTES_DIR : GIT_REFS_HEADS_DIR;
  
  	if (git_buf_joinpath(&ref_name, prefix, branch_name) < 0)
  		goto cleanup;
  
  	if ((error = git_reference_lookup(&branch, repo, ref_name.ptr)) < 0) {
  		giterr_set(GITERR_REFERENCE,
  			"Cannot locate %s branch '%s'.", is_remote ? "remote-tracking" : "local", branch_name);
  		goto cleanup;
  	}
  
  	*branch_reference_out = branch;
  
  cleanup:
  	git_buf_free(&ref_name);
  	return error;
  }
  
  static int create_error_invalid(const char *msg)
  {
  	giterr_set(GITERR_INVALID, "Cannot create branch - %s", msg);
  	return -1;
  }
  
  static int not_a_local_branch(git_reference *ref)
  {
  	giterr_set(GITERR_INVALID, "Reference '%s' is not a local branch.", git_reference_name(ref));
  	return -1;
  }
  
  int git_branch_create(
  		git_reference **ref_out,
  		git_repository *repository,
  		const char *branch_name,
  		const git_object *target,
  		int force)
  {
  	git_object *commit = NULL;
  	git_reference *branch = NULL;
  	git_buf canonical_branch_name = GIT_BUF_INIT;
  	int error = -1;
  
  	assert(branch_name && target && ref_out);
  	assert(git_object_owner(target) == repository);
  
  	if (git_object_peel(&commit, (git_object *)target, GIT_OBJ_COMMIT) < 0)
  		return create_error_invalid("The given target does not resolve to a commit");
  
  	if (git_buf_joinpath(&canonical_branch_name, GIT_REFS_HEADS_DIR, branch_name) < 0)
  		goto cleanup;
  
  	if (git_reference_create_oid(&branch, repository,
  		git_buf_cstr(&canonical_branch_name), git_object_id(commit), force) < 0)
  		goto cleanup;
  
  	*ref_out = branch;
  	error = 0;
  
  cleanup:
  	git_object_free(commit);
  	git_buf_free(&canonical_branch_name);
  	return error;
  }
  
  int git_branch_delete(git_reference *branch)
  {
  	int is_head;
  
  	assert(branch);
  
  	if (!git_reference_is_branch(branch) &&
  		!git_reference_is_remote(branch)) {
  		giterr_set(GITERR_INVALID, "Reference '%s' is not a valid branch.", git_reference_name(branch));
  		return -1;
  	}
  
  	if ((is_head = git_branch_is_head(branch)) < 0)
  		return is_head;
  
  	if (is_head) {
  		giterr_set(GITERR_REFERENCE,
  				"Cannot delete branch '%s' as it is the current HEAD of the repository.", git_reference_name(branch));
  		return -1;
  	}
  
  	return git_reference_delete(branch);
  }
  
  typedef struct {
  	int (*branch_cb)(
  			const char *branch_name,
  			git_branch_t branch_type,
  			void *payload);
  	void *callback_payload;
  	unsigned int branch_type;
  } branch_foreach_filter;
  
  static int branch_foreach_cb(const char *branch_name, void *payload)
  {
  	branch_foreach_filter *filter = (branch_foreach_filter *)payload;
  
  	if (filter->branch_type & GIT_BRANCH_LOCAL &&
  		git__prefixcmp(branch_name, GIT_REFS_HEADS_DIR) == 0)
  		return filter->branch_cb(branch_name + strlen(GIT_REFS_HEADS_DIR), GIT_BRANCH_LOCAL, filter->callback_payload);
  
  	if (filter->branch_type & GIT_BRANCH_REMOTE &&
  		git__prefixcmp(branch_name, GIT_REFS_REMOTES_DIR) == 0)
  		return filter->branch_cb(branch_name + strlen(GIT_REFS_REMOTES_DIR), GIT_BRANCH_REMOTE, filter->callback_payload);
  
  	return 0;
  }
  
  int git_branch_foreach(
  		git_repository *repo,
  		unsigned int list_flags,
  		int (*branch_cb)(
  			const char *branch_name,
  			git_branch_t branch_type,
  			void *payload),
  		void *payload
  )
  {
  	branch_foreach_filter filter;
  
  	filter.branch_cb = branch_cb;
  	filter.branch_type = list_flags;
  	filter.callback_payload = payload;
  
  	return git_reference_foreach(repo, GIT_REF_LISTALL, &branch_foreach_cb, (void *)&filter);
  }
  
  int git_branch_move(
  	git_reference *branch,
  	const char *new_branch_name,
  	int force)
  {
  	git_buf new_reference_name = GIT_BUF_INIT;
  	int error;
  
  	assert(branch && new_branch_name);
  
  	if (!git_reference_is_branch(branch))
  		return not_a_local_branch(branch);
  
  	if ((error = git_buf_joinpath(&new_reference_name, GIT_REFS_HEADS_DIR, new_branch_name)) < 0)
  		goto cleanup;
  
  	error = git_reference_rename(branch, git_buf_cstr(&new_reference_name), force);
  
  cleanup:
  	git_buf_free(&new_reference_name);
  
  	return error;
  }
  
  int git_branch_lookup(
  		git_reference **ref_out,
  		git_repository *repo,
  		const char *branch_name,
  		git_branch_t branch_type)
  {
  	assert(ref_out && repo && branch_name);
  
  	return retrieve_branch_reference(ref_out, repo, branch_name, branch_type == GIT_BRANCH_REMOTE);
  }
  
  static int retrieve_tracking_configuration(
  	const char **out, git_reference *branch, const char *format)
  {
  	git_config *config;
  	git_buf buf = GIT_BUF_INIT;
  	int error;
  
  	if (git_repository_config__weakptr(&config, git_reference_owner(branch)) < 0)
  		return -1;
  
  	if (git_buf_printf(&buf, format,
  		git_reference_name(branch) + strlen(GIT_REFS_HEADS_DIR)) < 0)
  			return -1;
  
  	error = git_config_get_string(out, config, git_buf_cstr(&buf));
  	git_buf_free(&buf);
  	return error;
  }
  
  int git_branch_tracking(
  		git_reference **tracking_out,
  		git_reference *branch)
  {
  	const char *remote_name, *merge_name;
  	git_buf buf = GIT_BUF_INIT;
  	int error = -1;
  	git_remote *remote = NULL;
  	const git_refspec *refspec;
  
  	assert(tracking_out && branch);
  
  	if (!git_reference_is_branch(branch))
  		return not_a_local_branch(branch);
  
  	if ((error = retrieve_tracking_configuration(&remote_name, branch, "branch.%s.remote")) < 0)
  		goto cleanup;
  
  	if ((error = retrieve_tracking_configuration(&merge_name, branch, "branch.%s.merge")) < 0)
  		goto cleanup;
  
  	if (strcmp(".", remote_name) != 0) {
  		if ((error = git_remote_load(&remote, git_reference_owner(branch), remote_name)) < 0)
  			goto cleanup;
  
  		refspec = git_remote_fetchspec(remote);
  		if (refspec == NULL
  			|| refspec->src == NULL
  			|| refspec->dst == NULL) {
  				error = GIT_ENOTFOUND;
  				goto cleanup;
  		}
  
  		if (git_refspec_transform_r(&buf, refspec, merge_name) < 0)
  			goto cleanup;
  	} else
  		if (git_buf_sets(&buf, merge_name) < 0)
  			goto cleanup;
  
  	error = git_reference_lookup(
  		tracking_out,
  		git_reference_owner(branch),
  		git_buf_cstr(&buf));
  
  cleanup:
  	git_remote_free(remote);
  	git_buf_free(&buf);
  	return error;
  }
  
  int git_branch_is_head(
  		git_reference *branch)
  {
  	git_reference *head;
  	bool is_same = false;
  
  	assert(branch);
  
  	if (!git_reference_is_branch(branch))
  		return false;
  
  	if (git_repository_head(&head, git_reference_owner(branch)) < 0)
  		return -1;
  
  	is_same = strcmp(
  		git_reference_name(branch),
  		git_reference_name(head)) == 0;
  
  	git_reference_free(head);
  
  	return is_same;
  }
  

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