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/*-
* Copyright (c) 2008-2013 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_meta_turtle_init --
* Check the turtle file and create if necessary.
*/
int
__wt_meta_turtle_init(WT_SESSION_IMPL *session, int *existp)
{
WT_DECL_RET;
WT_ITEM *buf;
int exist;
const char *cfg[3], *metaconf;
buf = NULL;
metaconf = NULL;
*existp = 0;
/* Discard any turtle setup file left-over from previous runs. */
WT_RET(__wt_exist(session, WT_METADATA_TURTLE_SET, &exist));
if (exist)
WT_RET(__wt_remove(session, WT_METADATA_TURTLE_SET));
/* If there's already a turtle file, we're done. */
WT_RET(__wt_exist(session, WT_METADATA_TURTLE, &exist));
if (exist) {
*existp = 1;
return (0);
}
/* Create a turtle file with default values. */
WT_ERR(__wt_scr_alloc(session, 0, &buf));
WT_ERR(__wt_buf_fmt(session, buf,
"key_format=S,value_format=S,version=(major=%d,minor=%d)",
WT_BTREE_MAJOR_VERSION, WT_BTREE_MINOR_VERSION));
cfg[0] = WT_CONFIG_VALUE(session, file_meta);
cfg[1] = buf->data;
cfg[2] = NULL;
WT_ERR(__wt_config_collapse(session, cfg, &metaconf));
WT_ERR(__wt_meta_turtle_update(session, WT_METADATA_URI, metaconf));
err: __wt_free(session, metaconf);
__wt_scr_free(&buf);
return (ret);
}
/*
* __wt_meta_turtle_read --
* Read the turtle file.
*/
int
__wt_meta_turtle_read(
WT_SESSION_IMPL *session, const char *key, const char **valuep)
{
FILE *fp;
WT_DECL_ITEM(buf);
WT_DECL_RET;
int match;
const char *path;
*valuep = NULL;
fp = NULL;
path = NULL;
/* Open the turtle file. */
WT_RET(__wt_filename(session, WT_METADATA_TURTLE, &path));
WT_ERR_TEST((fp = fopen(path, "r")) == NULL, __wt_errno());
/* Search for the key. */
WT_ERR(__wt_scr_alloc(session, 512, &buf));
for (match = 0;;) {
WT_ERR(__wt_getline(session, buf, fp));
if (buf->size == 0)
WT_ERR(WT_NOTFOUND);
if (strcmp(key, buf->data) == 0)
match = 1;
/* Key matched: read the subsequent line for the value. */
WT_ERR(__wt_getline(session, buf, fp));
if (buf->size == 0)
WT_ERR(__wt_illegal_value(session, WT_METADATA_TURTLE));
if (match)
break;
}
/* Copy the value for the caller. */
WT_ERR(__wt_strdup(session, buf->data, valuep));
err: if (fp != NULL)
WT_TRET(fclose(fp) == 0 ? 0 : __wt_errno());
if (path != NULL)
__wt_free(session, path);
__wt_scr_free(&buf);
return (ret);
}
/*
* __wt_meta_turtle_update --
* Update the turtle file.
*/
int
__wt_meta_turtle_update(
WT_SESSION_IMPL *session, const char *key, const char *value)
{
FILE *fp;
WT_DECL_RET;
WT_ITEM *buf;
int vmajor, vminor, vpatch;
const char *path, *version;
buf = NULL;
fp = NULL;
version = wiredtiger_version(&vmajor, &vminor, &vpatch);
/*
* Create the turtle setup file: we currently re-write it from scratch
* every time.
*/
WT_ERR(__wt_filename(session, WT_METADATA_TURTLE_SET, &path));
WT_ERR_TEST((fp = fopen(path, "w")) == NULL, __wt_errno());
WT_ERR_TEST((fprintf(fp,
"%s\n%s\n%s\n" "major=%d,minor=%d,patch=%d\n%s\n%s\n",
WT_METADATA_VERSION_STR, version,
WT_METADATA_VERSION, vmajor, vminor, vpatch,
key, value) < 0), __wt_errno());
ret = fclose(fp);
fp = NULL;
WT_ERR_TEST(ret == EOF, __wt_errno());
WT_ERR(
__wt_rename(session, WT_METADATA_TURTLE_SET, WT_METADATA_TURTLE));
if (0) {
err: WT_TRET(__wt_remove(session, WT_METADATA_TURTLE_SET));
}
if (fp != NULL)
WT_TRET(fclose(fp) == 0 ? 0 : __wt_errno());
__wt_free(session, path);
__wt_scr_free(&buf);
return (ret);
}
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