thodg/libgit2/src/checkout.c

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• Hash : 1d68fcd0
  Author :
  Date : 2012-07-16T16:16:11
  

  Checkout: handle symlinks. Includes unfinished win32 implementation.

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• src/checkout.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 <assert.h>
  
  #include "git2/checkout.h"
  #include "git2/repository.h"
  #include "git2/refs.h"
  #include "git2/tree.h"
  #include "git2/commit.h"
  #include "git2/blob.h"
  
  #include "common.h"
  #include "refs.h"
  #include "buffer.h"
  #include "repository.h"
  #include "filter.h"
  #include "blob.h"
  
  GIT_BEGIN_DECL
  
  
  typedef struct tree_walk_data
  {
  	git_indexer_stats *stats;
  	git_repository *repo;
  	git_odb *odb;
  } tree_walk_data;
  
  
  static int blob_contents_to_link(git_repository *repo, git_buf *fnbuf,
  											const git_oid *id)
  {
  	int retcode = GIT_ERROR;
  	git_blob *blob;
  
  	/* Get the link target */
  	if (!(retcode = git_blob_lookup(&blob, repo, id))) {
  		git_buf linktarget = GIT_BUF_INIT;
  		if (!(retcode = git_blob__getbuf(&linktarget, blob))) {
  			/* Create the link */
  			retcode = p_symlink(git_buf_cstr(&linktarget),
  									  git_buf_cstr(fnbuf));
  		}
  		git_buf_free(&linktarget);
  		git_blob_free(blob);
  	}
  
  	return retcode;
  }
  
  
  static int blob_contents_to_file(git_repository *repo, git_buf *fnbuf,
  											const git_oid *id, int mode)
  {
  	int retcode = GIT_ERROR;
  
  	git_buf filteredcontents = GIT_BUF_INIT;
  	if (!git_filter_blob_contents(&filteredcontents, repo, id, git_buf_cstr(fnbuf))) {
  		int fd = git_futils_creat_withpath(git_buf_cstr(fnbuf),
  													  GIT_DIR_MODE, mode);
  		if (fd >= 0) {
  			if (!p_write(fd, git_buf_cstr(&filteredcontents),
  							 git_buf_len(&filteredcontents)))
  				retcode = 0;
  			else
  				retcode = GIT_ERROR;
  			p_close(fd);
  		}
  	}
  	git_buf_free(&filteredcontents);
  
  	return retcode;
  }
  
  static int checkout_walker(const char *path, git_tree_entry *entry, void *payload)
  {
  	int retcode = 0;
  	tree_walk_data *data = (tree_walk_data*)payload;
  	int attr = git_tree_entry_attributes(entry);
  
  	/* TODO: handle submodules  */
  
  	switch(git_tree_entry_type(entry))
  	{
  	case GIT_OBJ_TREE:
  		/* Nothing to do; the blob handling creates necessary directories. */
  		break;
  
  	case GIT_OBJ_BLOB:
  		{
  			git_buf fnbuf = GIT_BUF_INIT;
  			git_buf_join_n(&fnbuf, '/', 3,
  								git_repository_workdir(data->repo),
  								path,
  								git_tree_entry_name(entry));
  			if (S_ISLNK(attr)) {
  				retcode = blob_contents_to_link(data->repo, &fnbuf,
  														  git_tree_entry_id(entry));
  			} else {
  				retcode = blob_contents_to_file(data->repo, &fnbuf,
  														  git_tree_entry_id(entry), attr);
  			}
  			git_buf_free(&fnbuf);
  		}
  		break;
  
  	default:
  		retcode = -1;
  		break;
  	}
  
  	data->stats->processed++;
  	return retcode;
  }
  
  
  int git_checkout_force(git_repository *repo, git_indexer_stats *stats)
  {
  	int retcode = GIT_ERROR;
  	git_indexer_stats dummy_stats;
  	git_tree *tree;
  	tree_walk_data payload;
  
  	assert(repo);
  	if (!stats) stats = &dummy_stats;
  
  	if (git_repository_is_bare(repo)) {
  		giterr_set(GITERR_INVALID, "Checkout is not allowed for bare repositories");
  		return GIT_ERROR;
  	}
  
  	stats->total = stats->processed = 0;
  	payload.stats = stats;
  	payload.repo = repo;
  	if (git_repository_odb(&payload.odb, repo) < 0) return GIT_ERROR;
  
  	/* TODO: stats->total is never calculated. */
  
  	if (!git_repository_head_tree(&tree, repo)) {
  		/* Checkout the files */
  		if (!git_tree_walk(tree, checkout_walker, GIT_TREEWALK_POST, &payload)) {
  			retcode = 0;
  		}
  		git_tree_free(tree);
  	}
  
  	git_odb_free(payload.odb);
  	return retcode;
  }
  
  
  GIT_END_DECL
  

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