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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/**
* SECTION: e-db3-utils
* @short_description: Utilities for Berkeley DB databases
*
* Utilities for coping with Berkeley DB file format changes.
**/
#include "config.h"
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#ifndef O_BINARY
#define O_BINARY 0
#endif
#include <glib/gstdio.h>
#include "db.h"
#include "e-db3-utils.h"
static gchar *
get_check_filename (const gchar *filename)
{
return g_strdup_printf ("%s-upgrading", filename);
}
static gchar *
get_copy_filename (const gchar *filename)
{
return g_strdup_printf ("%s-copy", filename);
}
static gint
cp_file (const gchar *src,
const gchar *dest)
{
gint i;
gint o;
gchar buffer[1024];
gint length;
gint place;
i = g_open (src, O_RDONLY | O_BINARY, 0);
if (i == -1)
return -1;
o = g_open (
dest, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
S_IREAD | S_IWRITE);
if (o == -1) {
close (i);
return -1;
}
while (1) {
length = read (i, &buffer, sizeof (buffer));
if (length == 0)
break;
if (length == -1) {
if (errno == EINTR)
continue;
else {
close (i);
close (o);
g_unlink (dest);
return -1;
}
}
place = 0;
while (length != 0) {
gint count;
count = write (o, buffer + place, length);
if (count == -1) {
if (errno == EINTR)
continue;
else {
close (i);
close (o);
g_unlink (dest);
return -1;
}
}
length -= count;
place += count;
}
}
i = close (i);
if (close (o) == -1)
i = -1;
return (i == -1) ? -1 : 0;
}
static gint
touch_file (const gchar *file)
{
gint fd;
fd = g_open (
file, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
S_IREAD | S_IWRITE);
if (fd == -1)
return -1;
return close (fd);
}
static gint
resume_upgrade (const gchar *filename,
const gchar *copy_filename,
const gchar *check_filename)
{
DB *db;
gint ret_val;
ret_val = db_create (&db, NULL, 0);
if (ret_val == 0)
ret_val = cp_file (copy_filename, filename);
if (ret_val == 0)
ret_val = db->upgrade (db, filename, 0);
if (ret_val == 0)
ret_val = g_unlink (check_filename);
if (ret_val == 0)
ret_val = g_unlink (copy_filename);
db->close (db, 0);
return ret_val;
}
/**
* e_db3_utils_maybe_recover:
* @filename: path to a Berkeley DB file
*
* Tries to recover from a failed file format upgrade.
*
* Returns: 0 if successful, -1 on failure
**/
gint
e_db3_utils_maybe_recover (const gchar *filename)
{
gint ret_val = 0;
gchar *copy_filename;
gchar *check_filename;
copy_filename = get_copy_filename (filename);
check_filename = get_check_filename (filename);
if (g_file_test (check_filename, G_FILE_TEST_EXISTS)) {
ret_val = resume_upgrade (filename, copy_filename, check_filename);
} else if (g_file_test (copy_filename, G_FILE_TEST_EXISTS)) {
g_unlink (copy_filename);
}
g_free (copy_filename);
g_free (check_filename);
return ret_val;
}
/**
* e_db3_utils_upgrade_format:
* @filename: path to a Berkeley DB file
*
* Upgrades the file format of a Berkeley DB file from a previous version.
*
* Returns: 0 if successful, -1 on failure
**/
gint
e_db3_utils_upgrade_format (const gchar *filename)
{
gchar *copy_filename;
gchar *check_filename;
DB *db;
gint ret_val;
ret_val = db_create (&db, NULL, 0);
if (ret_val != 0)
return ret_val;
copy_filename = get_copy_filename (filename);
check_filename = get_check_filename (filename);
ret_val = cp_file (filename, copy_filename);
if (ret_val == 0)
ret_val = touch_file (check_filename);
if (ret_val == 0)
ret_val = db->upgrade (db, filename, 0);
if (ret_val == 0)
ret_val = g_unlink (check_filename);
if (ret_val == 0)
ret_val = g_unlink (copy_filename);
db->close (db, 0);
g_free (check_filename);
g_free (copy_filename);
return ret_val;
}
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