thodg/libgit2/src/clone.c

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• Hash : 659cf202
  Author :
  Date : 2015-01-07T12:23:05
  

  Remove the signature from ref-modifying functions The signature for the reflog is not something which changes dynamically. Almost all uses will be NULL, since we want for the repository's default identity to be used, making it noise. In order to allow for changing the identity, we instead provide git_repository_set_ident() and git_repository_ident() which allow a user to override the choice of signature.

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• src/clone.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 <assert.h>
  
  #include "git2/clone.h"
  #include "git2/remote.h"
  #include "git2/revparse.h"
  #include "git2/branch.h"
  #include "git2/config.h"
  #include "git2/checkout.h"
  #include "git2/commit.h"
  #include "git2/tree.h"
  
  #include "common.h"
  #include "remote.h"
  #include "fileops.h"
  #include "refs.h"
  #include "path.h"
  #include "repository.h"
  #include "odb.h"
  
  static int clone_local_into(git_repository *repo, git_remote *remote, const git_checkout_options *co_opts, const char *branch, int link);
  
  static int create_branch(
  	git_reference **branch,
  	git_repository *repo,
  	const git_oid *target,
  	const char *name,
  	const char *log_message)
  {
  	git_commit *head_obj = NULL;
  	git_reference *branch_ref = NULL;
  	git_buf refname = GIT_BUF_INIT;
  	int error;
  
  	/* Find the target commit */
  	if ((error = git_commit_lookup(&head_obj, repo, target)) < 0)
  		return error;
  
  	/* Create the new branch */
  	if ((error = git_buf_printf(&refname, GIT_REFS_HEADS_DIR "%s", name)) < 0)
  		return error;
  
  	error = git_reference_create(&branch_ref, repo, git_buf_cstr(&refname), target, 0, log_message);
  	git_buf_free(&refname);
  	git_commit_free(head_obj);
  
  	if (!error)
  		*branch = branch_ref;
  	else
  		git_reference_free(branch_ref);
  
  	return error;
  }
  
  static int setup_tracking_config(
  	git_repository *repo,
  	const char *branch_name,
  	const char *remote_name,
  	const char *merge_target)
  {
  	git_config *cfg;
  	git_buf remote_key = GIT_BUF_INIT, merge_key = GIT_BUF_INIT;
  	int error = -1;
  
  	if (git_repository_config__weakptr(&cfg, repo) < 0)
  		return -1;
  
  	if (git_buf_printf(&remote_key, "branch.%s.remote", branch_name) < 0)
  		goto cleanup;
  
  	if (git_buf_printf(&merge_key, "branch.%s.merge", branch_name) < 0)
  		goto cleanup;
  
  	if (git_config_set_string(cfg, git_buf_cstr(&remote_key), remote_name) < 0)
  		goto cleanup;
  
  	if (git_config_set_string(cfg, git_buf_cstr(&merge_key), merge_target) < 0)
  		goto cleanup;
  
  	error = 0;
  
  cleanup:
  	git_buf_free(&remote_key);
  	git_buf_free(&merge_key);
  	return error;
  }
  
  static int create_tracking_branch(
  	git_reference **branch,
  	git_repository *repo,
  	const git_oid *target,
  	const char *branch_name,
  	const char *log_message)
  {
  	int error;
  
  	if ((error = create_branch(branch, repo, target, branch_name, log_message)) < 0)
  		return error;
  
  	return setup_tracking_config(
  		repo,
  		branch_name,
  		GIT_REMOTE_ORIGIN,
  		git_reference_name(*branch));
  }
  
  static int update_head_to_new_branch(
  	git_repository *repo,
  	const git_oid *target,
  	const char *name,
  	const char *reflog_message)
  {
  	git_reference *tracking_branch = NULL;
  	int error;
  
  	if (!git__prefixcmp(name, GIT_REFS_HEADS_DIR))
  		name += strlen(GIT_REFS_HEADS_DIR);
  
  	error = create_tracking_branch(&tracking_branch, repo, target, name,
  			reflog_message);
  
  	if (!error)
  		error = git_repository_set_head(
  			repo, git_reference_name(tracking_branch));
  
  	git_reference_free(tracking_branch);
  
  	/* if it already existed, then the user's refspec created it for us, ignore it' */
  	if (error == GIT_EEXISTS)
  		error = 0;
  
  	return error;
  }
  
  static int update_head_to_remote(
  		git_repository *repo,
  		git_remote *remote,
  		const char *reflog_message)
  {
  	int error = 0;
  	size_t refs_len;
  	git_refspec *refspec;
  	const git_remote_head *remote_head, **refs;
  	const git_oid *remote_head_id;
  	git_buf remote_master_name = GIT_BUF_INIT;
  	git_buf branch = GIT_BUF_INIT;
  
  	if ((error = git_remote_ls(&refs, &refs_len, remote)) < 0)
  		return error;
  
  	/* We cloned an empty repository or one with an unborn HEAD */
  	if (refs_len == 0 || strcmp(refs[0]->name, GIT_HEAD_FILE))
  		return setup_tracking_config(
  			repo, "master", GIT_REMOTE_ORIGIN, GIT_REFS_HEADS_MASTER_FILE);
  
  	/* We know we have HEAD, let's see where it points */
  	remote_head = refs[0];
  	assert(remote_head);
  
  	remote_head_id = &remote_head->oid;
  
  	error = git_remote_default_branch(&branch, remote);
  	if (error == GIT_ENOTFOUND) {
  		error = git_repository_set_head_detached(
  			repo, remote_head_id);
  		goto cleanup;
  	}
  
  	refspec = git_remote__matching_refspec(remote, git_buf_cstr(&branch));
  
  	if (refspec == NULL) {
  		giterr_set(GITERR_NET, "the remote's default branch does not fit the refspec configuration");
  		error = GIT_EINVALIDSPEC;
  		goto cleanup;
  	}
  
  	/* Determine the remote tracking reference name from the local master */
  	if ((error = git_refspec_transform(
  		&remote_master_name,
  		refspec,
  		git_buf_cstr(&branch))) < 0)
  		goto cleanup;
  
  	error = update_head_to_new_branch(
  		repo,
  		remote_head_id,
  		git_buf_cstr(&branch),
  		reflog_message);
  
  cleanup:
  	git_buf_free(&remote_master_name);
  	git_buf_free(&branch);
  
  	return error;
  }
  
  static int update_head_to_branch(
  		git_repository *repo,
  		const char *remote_name,
  		const char *branch,
  		const char *reflog_message)
  {
  	int retcode;
  	git_buf remote_branch_name = GIT_BUF_INIT;
  	git_reference* remote_ref = NULL;
  
  	assert(remote_name && branch);
  
  	if ((retcode = git_buf_printf(&remote_branch_name, GIT_REFS_REMOTES_DIR "%s/%s",
  		remote_name, branch)) < 0 )
  		goto cleanup;
  
  	if ((retcode = git_reference_lookup(&remote_ref, repo, git_buf_cstr(&remote_branch_name))) < 0)
  		goto cleanup;
  
  	retcode = update_head_to_new_branch(repo, git_reference_target(remote_ref), branch,
  			reflog_message);
  
  cleanup:
  	git_reference_free(remote_ref);
  	git_buf_free(&remote_branch_name);
  	return retcode;
  }
  
  static int default_repository_create(git_repository **out, const char *path, int bare, void *payload)
  {
  	GIT_UNUSED(payload);
  
  	return git_repository_init(out, path, bare);
  }
  
  static int default_remote_create(
  		git_remote **out,
  		git_repository *repo,
  		const char *name,
  		const char *url,
  		void *payload)
  {
  	int error;
  	git_remote_callbacks *callbacks = payload;
  
  	if ((error = git_remote_create(out, repo, name, url)) < 0)
  		return error;
  
  	return git_remote_set_callbacks(*out, callbacks);
  }
  
  /*
   * submodules?
   */
  
  static int create_and_configure_origin(
  		git_remote **out,
  		git_repository *repo,
  		const char *url,
  		const git_clone_options *options)
  {
  	int error;
  	git_remote *origin = NULL;
  	char buf[GIT_PATH_MAX];
  	git_remote_create_cb remote_create = options->remote_cb;
  	void *payload = options->remote_cb_payload;
  
  	/* If the path exists and is a dir, the url should be the absolute path */
  	if (git_path_root(url) < 0 && git_path_exists(url) && git_path_isdir(url)) {
  		if (p_realpath(url, buf) == NULL)
  			return -1;
  
  		url = buf;
  	}
  
  	if (!remote_create) {
  		remote_create = default_remote_create;
  		payload = (void *)&options->remote_callbacks;
  	}
  
  	if ((error = remote_create(&origin, repo, "origin", url, payload)) < 0)
  		goto on_error;
  
  	if ((error = git_remote_save(origin)) < 0)
  		goto on_error;
  
  	*out = origin;
  	return 0;
  
  on_error:
  	git_remote_free(origin);
  	return error;
  }
  
  static bool should_checkout(
  	git_repository *repo,
  	bool is_bare,
  	const git_checkout_options *opts)
  {
  	if (is_bare)
  		return false;
  
  	if (!opts)
  		return false;
  
  	if (opts->checkout_strategy == GIT_CHECKOUT_NONE)
  		return false;
  
  	return !git_repository_head_unborn(repo);
  }
  
  static int checkout_branch(git_repository *repo, git_remote *remote, const git_checkout_options *co_opts, const char *branch, const char *reflog_message)
  {
  	int error;
  
  	if (branch)
  		error = update_head_to_branch(repo, git_remote_name(remote), branch,
  				reflog_message);
  	/* Point HEAD to the same ref as the remote's head */
  	else
  		error = update_head_to_remote(repo, remote, reflog_message);
  
  	if (!error && should_checkout(repo, git_repository_is_bare(repo), co_opts))
  		error = git_checkout_head(repo, co_opts);
  
  	return error;
  }
  
  static int clone_into(git_repository *repo, git_remote *_remote, const git_checkout_options *co_opts, const char *branch)
  {
  	int error;
  	git_buf reflog_message = GIT_BUF_INIT;
  	git_remote *remote;
  	const git_remote_callbacks *callbacks;
  
  	assert(repo && _remote);
  
  	if (!git_repository_is_empty(repo)) {
  		giterr_set(GITERR_INVALID, "the repository is not empty");
  		return -1;
  	}
  
  	if ((error = git_remote_dup(&remote, _remote)) < 0)
  		return error;
  
  	callbacks = git_remote_get_callbacks(_remote);
  	if (!giterr__check_version(callbacks, 1, "git_remote_callbacks") &&
  	    (error = git_remote_set_callbacks(remote, callbacks)) < 0)
  		goto cleanup;
  
  	if ((error = git_remote_add_fetch(remote, "refs/tags/*:refs/tags/*")) < 0)
  		goto cleanup;
  
  	git_remote_set_update_fetchhead(remote, 0);
  	git_buf_printf(&reflog_message, "clone: from %s", git_remote_url(remote));
  
  	if ((error = git_remote_fetch(remote, NULL, git_buf_cstr(&reflog_message))) != 0)
  		goto cleanup;
  
  	error = checkout_branch(repo, remote, co_opts, branch, git_buf_cstr(&reflog_message));
  
  cleanup:
  	git_remote_free(remote);
  	git_buf_free(&reflog_message);
  
  	return error;
  }
  
  int git_clone__should_clone_local(const char *url_or_path, git_clone_local_t local)
  {
  	git_buf fromurl = GIT_BUF_INIT;
  	const char *path = url_or_path;
  	bool is_url, is_local;
  
  	if (local == GIT_CLONE_NO_LOCAL)
  		return 0;
  
  	if ((is_url = git_path_is_local_file_url(url_or_path)) != 0) {
  		if (git_path_fromurl(&fromurl, url_or_path) < 0) {
  			is_local = -1;
  			goto done;
  		}
  
  		path = fromurl.ptr;
  	}
  
  	is_local = (!is_url || local != GIT_CLONE_LOCAL_AUTO) &&
  		git_path_isdir(path);
  
  done:
  	git_buf_free(&fromurl);
  	return is_local;
  }
  
  int git_clone(
  	git_repository **out,
  	const char *url,
  	const char *local_path,
  	const git_clone_options *_options)
  {
  	int error = 0;
  	git_repository *repo = NULL;
  	git_remote *origin;
  	git_clone_options options = GIT_CLONE_OPTIONS_INIT;
  	uint32_t rmdir_flags = GIT_RMDIR_REMOVE_FILES;
  	git_repository_create_cb repository_cb;
  
  	assert(out && url && local_path);
  
  	if (_options)
  		memcpy(&options, _options, sizeof(git_clone_options));
  
  	GITERR_CHECK_VERSION(&options, GIT_CLONE_OPTIONS_VERSION, "git_clone_options");
  
  	/* Only clone to a new directory or an empty directory */
  	if (git_path_exists(local_path) && !git_path_is_empty_dir(local_path)) {
  		giterr_set(GITERR_INVALID,
  			"'%s' exists and is not an empty directory", local_path);
  		return GIT_EEXISTS;
  	}
  
  	/* Only remove the root directory on failure if we create it */
  	if (git_path_exists(local_path))
  		rmdir_flags |= GIT_RMDIR_SKIP_ROOT;
  
  	if (options.repository_cb)
  		repository_cb = options.repository_cb;
  	else
  		repository_cb = default_repository_create;
  
  	if ((error = repository_cb(&repo, local_path, options.bare, options.repository_cb_payload)) < 0)
  		return error;
  
  	if (!(error = create_and_configure_origin(&origin, repo, url, &options))) {
  		int clone_local = git_clone__should_clone_local(url, options.local);
  		int link = options.local != GIT_CLONE_LOCAL_NO_LINKS;
  
  		if (clone_local == 1)
  			error = clone_local_into(
  				repo, origin, &options.checkout_opts,
  				options.checkout_branch, link);
  		else if (clone_local == 0)
  			error = clone_into(
  				repo, origin, &options.checkout_opts,
  				options.checkout_branch);
  		else
  			error = -1;
  
  		git_remote_free(origin);
  	}
  
  	if (error != 0) {
  		git_error_state last_error = {0};
  		giterr_capture(&last_error, error);
  
  		git_repository_free(repo);
  		repo = NULL;
  
  		(void)git_futils_rmdir_r(local_path, NULL, rmdir_flags);
  
  		giterr_restore(&last_error);
  	}
  
  	*out = repo;
  	return error;
  }
  
  int git_clone_init_options(git_clone_options *opts, unsigned int version)
  {
  	GIT_INIT_STRUCTURE_FROM_TEMPLATE(
  		opts, version, git_clone_options, GIT_CLONE_OPTIONS_INIT);
  	return 0;
  }
  
  static const char *repository_base(git_repository *repo)
  {
  	if (git_repository_is_bare(repo))
  		return git_repository_path(repo);
  
  	return git_repository_workdir(repo);
  }
  
  static bool can_link(const char *src, const char *dst, int link)
  {
  #ifdef GIT_WIN32
  	GIT_UNUSED(src);
  	GIT_UNUSED(dst);
  	GIT_UNUSED(link);
  	return false;
  #else
  
  	struct stat st_src, st_dst;
  
  	if (!link)
  		return false;
  
  	if (p_stat(src, &st_src) < 0)
  		return false;
  
  	if (p_stat(dst, &st_dst) < 0)
  		return false;
  
  	return st_src.st_dev == st_dst.st_dev;
  #endif
  }
  
  static int clone_local_into(git_repository *repo, git_remote *remote, const git_checkout_options *co_opts, const char *branch, int link)
  {
  	int error, flags;
  	git_repository *src;
  	git_buf src_odb = GIT_BUF_INIT, dst_odb = GIT_BUF_INIT, src_path = GIT_BUF_INIT;
  	git_buf reflog_message = GIT_BUF_INIT;
  
  	assert(repo && remote);
  
  	if (!git_repository_is_empty(repo)) {
  		giterr_set(GITERR_INVALID, "the repository is not empty");
  		return -1;
  	}
  
  	/*
  	 * Let's figure out what path we should use for the source
  	 * repo, if it's not rooted, the path should be relative to
  	 * the repository's worktree/gitdir.
  	 */
  	if ((error = git_path_from_url_or_path(&src_path, git_remote_url(remote))) < 0)
  		return error;
  
  	/* Copy .git/objects/ from the source to the target */
  	if ((error = git_repository_open(&src, git_buf_cstr(&src_path))) < 0) {
  		git_buf_free(&src_path);
  		return error;
  	}
  
  	git_buf_joinpath(&src_odb, git_repository_path(src), GIT_OBJECTS_DIR);
  	git_buf_joinpath(&dst_odb, git_repository_path(repo), GIT_OBJECTS_DIR);
  	if (git_buf_oom(&src_odb) || git_buf_oom(&dst_odb)) {
  		error = -1;
  		goto cleanup;
  	}
  
  	flags = 0;
  	if (can_link(git_repository_path(src), git_repository_path(repo), link))
  		flags |= GIT_CPDIR_LINK_FILES;
  
  	if ((error = git_futils_cp_r(git_buf_cstr(&src_odb), git_buf_cstr(&dst_odb),
  				     flags, GIT_OBJECT_DIR_MODE)) < 0)
  		goto cleanup;
  
  	git_buf_printf(&reflog_message, "clone: from %s", git_remote_url(remote));
  
  	if ((error = git_remote_fetch(remote, NULL, git_buf_cstr(&reflog_message))) != 0)
  		goto cleanup;
  
  	error = checkout_branch(repo, remote, co_opts, branch, git_buf_cstr(&reflog_message));
  
  cleanup:
  	git_buf_free(&reflog_message);
  	git_buf_free(&src_path);
  	git_buf_free(&src_odb);
  	git_buf_free(&dst_odb);
  	git_repository_free(src);
  	return error;
  }
  

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