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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
#include "config.h"
#include "e-db3-utils.h"
#include <db.h>
#include <errno.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <libgnome/gnome-defs.h>
#include <libgnome/gnome-util.h>
#if DB_VERSION_MAJOR != 3 || \
DB_VERSION_MINOR != 1 || \
DB_VERSION_PATCH != 17
#error Including wrong DB3. Need libdb 3.1.17.
#endif
static char *
get_check_filename (const char *filename)
{
return g_strdup_printf ("%s-upgrading", filename);
}
static char *
get_copy_filename (const char *filename)
{
return g_strdup_printf ("%s-copy", filename);
}
static int
cp_file (const char *src, const char *dest)
{
int i;
int o;
char buffer[1024];
int length;
int place;
i = open (src, O_RDONLY);
if (i == -1)
return -1;
o = creat (dest, 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);
unlink (dest);
return -1;
}
}
place = 0;
while (length != 0) {
int count;
count = write (o, buffer + place, length);
if (count == -1) {
if (errno == EINTR)
continue;
else {
close (i);
close (o);
unlink (dest);
return -1;
}
}
length -= count;
place += count;
}
}
if (close (i))
return -1;
if (close (o))
return -1;
return 0;
}
static int
touch_file (const char *file)
{
int o;
o = creat (file, S_IREAD | S_IWRITE);
if (o == -1)
return -1;
if (close (o) == -1)
return -1;
return 0;
}
static int
resume_upgrade (const char *filename, const char *copy_filename, const char *check_filename)
{
DB *db;
int 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 = unlink (check_filename);
if (ret_val == 0)
ret_val = unlink (copy_filename);
db->close (db, 0);
return ret_val;
}
int
e_db3_utils_maybe_recover (const char *filename)
{
int ret_val = 0;
char *copy_filename;
char *check_filename;
copy_filename = get_copy_filename (filename);
check_filename = get_check_filename (filename);
if (g_file_exists (check_filename)) {
ret_val = resume_upgrade(filename, copy_filename, check_filename);
} else if (g_file_exists (copy_filename)) {
unlink (copy_filename);
}
g_free (copy_filename);
g_free (check_filename);
return ret_val;
}
int
e_db3_utils_upgrade_format (const char *filename)
{
char *copy_filename;
char *check_filename;
DB *db;
int 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 = unlink (check_filename);
if (ret_val == 0)
ret_val = unlink (copy_filename);
db->close (db, 0);
g_free (check_filename);
g_free (copy_filename);
return ret_val;
}
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