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/*-
* Copyright (c) 2014-2015 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "util.h"
static int copy(const char *, const char *);
static int usage(void);
#define CBUF_LEN (128 * 1024) /* Copy buffer and size. */
static char *cbuf;
/*
* append_target --
* Build a list of comma-separated targets.
*/
static int
append_target(WT_SESSION *session, const char *target, char **bufp)
{
static int first = 1;
static size_t len = 0, remain = 0;
static char *buf = NULL;
/* 20 bytes of slop */
if (remain < strlen(target) + 20) {
len += strlen(target) + 512;
remain += strlen(target) + 512;
if ((buf = realloc(buf, len)) == NULL)
return (util_err(session, errno, NULL));
*bufp = buf;
}
if (first) {
first = 0;
strcpy(buf, "target=(");
} else
buf[strlen(buf) - 1] = ','; /* overwrite previous ")" */
strcat(buf, "\"");
strcat(buf, target);
strcat(buf, "\")");
remain -= strlen(target) + 1;
return (0);
}
int
util_backup(WT_SESSION *session, int argc, char *argv[])
{
WT_CURSOR *cursor;
WT_DECL_RET;
int ch;
char *config;
const char *directory, *name;
config = NULL;
while ((ch = __wt_getopt(progname, argc, argv, "t:")) != EOF)
switch (ch) {
case 't':
if (append_target(session, __wt_optarg, &config))
return (1);
break;
case '?':
default:
return (usage());
}
argc -= __wt_optind;
argv += __wt_optind;
if (argc != 1) {
(void)usage();
goto err;
}
directory = *argv;
if ((ret = session->open_cursor(
session, "backup:", NULL, config, &cursor)) != 0) {
fprintf(stderr, "%s: cursor open(backup:) failed: %s\n",
progname, session->strerror(session, ret));
goto err;
}
/* Copy the files. */
while (
(ret = cursor->next(cursor)) == 0 &&
(ret = cursor->get_key(cursor, &name)) == 0)
if ((ret = copy(name, directory)) != 0)
goto err;
if (ret == WT_NOTFOUND)
ret = 0;
if (ret != 0) {
fprintf(stderr, "%s: cursor next(backup:) failed: %s\n",
progname, session->strerror(session, ret));
goto err;
}
err: if (config != NULL)
free(config);
if (cbuf != NULL)
free(cbuf);
return (ret);
}
static int
copy(const char *name, const char *directory)
{
WT_DECL_RET;
ssize_t n;
int ifd, ofd;
ret = 1;
ifd = ofd = -1;
if (verbose &&
printf("Backing up %s/%s to %s\n", home, name, directory) < 0) {
fprintf(stderr, "%s: %s\n", progname, strerror(errno));
return (1);
}
/* Allocate a large copy buffer (use it to build pathnames as well. */
if (cbuf == NULL && (cbuf = malloc(CBUF_LEN)) == NULL)
goto memerr;
/* Open the read file. */
if (snprintf(cbuf, CBUF_LEN, "%s/%s", home, name) >= CBUF_LEN)
goto memerr;
if ((ifd = open(cbuf, O_BINARY | O_RDONLY, 0)) < 0)
goto readerr;
/* Open the write file. */
if (snprintf(cbuf, CBUF_LEN, "%s/%s", directory, name) >= CBUF_LEN)
goto memerr;
if ((ofd = open(
cbuf, O_BINARY | O_CREAT | O_WRONLY | O_TRUNC, 0666)) < 0)
goto writerr;
/* Copy the file. */
while ((n = read(ifd, cbuf, CBUF_LEN)) > 0)
if (write(ofd, cbuf, (size_t)n) != n)
goto writerr;
if (n != 0)
goto readerr;
/*
* Close file descriptors (forcing a flush on the write side), and
* check for any errors.
*/
ret = close(ifd);
ifd = -1;
if (ret != 0)
goto readerr;
/*
* We need to know this file was successfully written, it's a backup.
*/
#ifdef _WIN32
if (FlushFileBuffers((HANDLE)_get_osfhandle(ofd)) == 0) {
DWORD err = GetLastError();
ret = err;
goto writerr;
}
#else
if (fsync(ofd))
goto writerr;
#endif
ret = close(ofd);
ofd = -1;
if (ret != 0)
goto writerr;
/* Success. */
ret = 0;
if (0) {
readerr: fprintf(stderr,
"%s: %s/%s: %s\n", progname, home, name, strerror(errno));
}
if (0) {
writerr: fprintf(stderr, "%s: %s/%s: %s\n",
progname, directory, name, strerror(errno));
}
if (0) {
memerr: fprintf(stderr, "%s: %s\n", progname, strerror(errno));
}
if (ifd >= 0)
(void)close(ifd);
if (ofd >= 0)
(void)close(ofd);
return (ret);
}
static int
usage(void)
{
(void)fprintf(stderr,
"usage: %s %s "
"backup [-t uri] directory\n",
progname, usage_prefix);
return (1);
}
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