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/*
* 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 "git2/config.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_checkout_opts *opts;
git_repository *repo;
git_odb *odb;
bool no_symlinks;
} tree_walk_data;
static int blob_contents_to_link(tree_walk_data *data, git_buf *fnbuf,
const git_oid *id)
{
int retcode = GIT_ERROR;
git_blob *blob;
/* Get the link target */
if (!(retcode = git_blob_lookup(&blob, data->repo, id))) {
git_buf linktarget = GIT_BUF_INIT;
if (!(retcode = git_blob__getbuf(&linktarget, blob))) {
/* Create the link */
const char *new = git_buf_cstr(&linktarget),
*old = git_buf_cstr(fnbuf);
retcode = data->no_symlinks
? git_futils_fake_symlink(new, old)
: p_symlink(new, old);
}
git_buf_free(&linktarget);
git_blob_free(blob);
}
return retcode;
}
static int blob_contents_to_file(git_repository *repo, git_buf *fnbuf,
const git_tree_entry *entry, tree_walk_data *data)
{
int retcode = GIT_ERROR;
int fd = -1;
git_buf contents = GIT_BUF_INIT;
const git_oid *id = git_tree_entry_id(entry);
int file_mode = data->opts->file_mode;
/* Deal with pre-existing files */
if (git_path_exists(git_buf_cstr(fnbuf)) &&
data->opts->existing_file_action == GIT_CHECKOUT_SKIP_EXISTING)
return 0;
/* Allow disabling of filters */
if (data->opts->disable_filters) {
git_blob *blob;
if (!(retcode = git_blob_lookup(&blob, repo, id))) {
retcode = git_blob__getbuf(&contents, blob);
git_blob_free(blob);
}
} else {
retcode = git_filter_blob_contents(&contents, repo, id, git_buf_cstr(fnbuf));
}
if (retcode < 0) goto bctf_cleanup;
/* Allow overriding of file mode */
if (!file_mode)
file_mode = git_tree_entry_filemode(entry);
if ((retcode = git_futils_mkpath2file(git_buf_cstr(fnbuf), data->opts->dir_mode)) < 0)
goto bctf_cleanup;
fd = p_open(git_buf_cstr(fnbuf), data->opts->file_open_flags, file_mode);
if (fd < 0) goto bctf_cleanup;
if (!p_write(fd, git_buf_cstr(&contents), git_buf_len(&contents)))
retcode = 0;
else
retcode = GIT_ERROR;
p_close(fd);
bctf_cleanup:
git_buf_free(&contents);
return retcode;
}
static int checkout_walker(const char *path, const git_tree_entry *entry, void *payload)
{
int retcode = 0;
tree_walk_data *data = (tree_walk_data*)payload;
int attr = git_tree_entry_filemode(entry);
git_buf fnbuf = GIT_BUF_INIT;
git_buf_join_n(&fnbuf, '/', 3,
git_repository_workdir(data->repo),
path,
git_tree_entry_name(entry));
switch(git_tree_entry_type(entry))
{
case GIT_OBJ_TREE:
/* Nothing to do; the blob handling creates necessary directories. */
break;
case GIT_OBJ_COMMIT:
/* Submodule */
git_futils_mkpath2file(git_buf_cstr(&fnbuf), data->opts->dir_mode);
retcode = p_mkdir(git_buf_cstr(&fnbuf), data->opts->dir_mode);
break;
case GIT_OBJ_BLOB:
if (S_ISLNK(attr)) {
retcode = blob_contents_to_link(data, &fnbuf,
git_tree_entry_id(entry));
} else {
retcode = blob_contents_to_file(data->repo, &fnbuf, entry, data);
}
break;
default:
retcode = -1;
break;
}
git_buf_free(&fnbuf);
data->stats->processed++;
return retcode;
}
int git_checkout_head(git_repository *repo, git_checkout_opts *opts, git_indexer_stats *stats)
{
int retcode = GIT_ERROR;
git_indexer_stats dummy_stats;
git_checkout_opts default_opts = {0};
git_tree *tree;
tree_walk_data payload;
git_config *cfg;
assert(repo);
if (!opts) opts = &default_opts;
if (!stats) stats = &dummy_stats;
/* Default options */
if (!opts->existing_file_action)
opts->existing_file_action = GIT_CHECKOUT_OVERWRITE_EXISTING;
/* opts->disable_filters is false by default */
if (!opts->dir_mode) opts->dir_mode = GIT_DIR_MODE;
if (!opts->file_open_flags)
opts->file_open_flags = O_CREAT | O_TRUNC | O_WRONLY;
if (git_repository_is_bare(repo)) {
giterr_set(GITERR_INVALID, "Checkout is not allowed for bare repositories");
return GIT_ERROR;
}
memset(&payload, 0, sizeof(payload));
/* Determine if symlinks should be handled */
if (!git_repository_config__weakptr(&cfg, repo)) {
int temp = true;
if (!git_config_get_bool(&temp, cfg, "core.symlinks")) {
payload.no_symlinks = !temp;
}
}
stats->total = stats->processed = 0;
payload.stats = stats;
payload.opts = opts;
payload.repo = repo;
if (git_repository_odb(&payload.odb, repo) < 0) return GIT_ERROR;
if (!git_repository_head_tree(&tree, repo)) {
git_index *idx;
if (!(retcode = git_repository_index(&idx, repo))) {
if (!(retcode = git_index_read_tree(idx, tree, stats))) {
git_index_write(idx);
retcode = git_tree_walk(tree, checkout_walker, GIT_TREEWALK_POST, &payload);
}
git_index_free(idx);
}
git_tree_free(tree);
}
git_odb_free(payload.odb);
return retcode;
}
int git_checkout_reference(git_reference *ref,
git_checkout_opts *opts,
git_indexer_stats *stats)
{
git_repository *repo= git_reference_owner(ref);
git_reference *head = NULL;
int retcode = GIT_ERROR;
if ((retcode = git_reference_create_symbolic(&head, repo, GIT_HEAD_FILE,
git_reference_name(ref), true)) < 0)
return retcode;
retcode = git_checkout_head(git_reference_owner(ref), opts, stats);
git_reference_free(head);
return retcode;
}
GIT_END_DECL
|
