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backupfs-hist.c
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backupfs-hist.c
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/* $Id: backupfs-hist.c,v 1.8 2005/04/21 04:46:01 cvsremote Exp $
backupfs-hist.c: main for backupfs-hist
Copyright (c) 2005, Yoichi Hariguchi
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
o Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
o Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following
disclaimer in the documentation and/or other materials provided
with the distribution.
o Neither the name of the Yoichi Hariguchi nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "backupfs.h"
#include "error.h"
#define DATE "/yyyy/mm/dd"
typedef enum {
INODE_NOPATH = 0,
INODE_CHANGE = 1,
INODE_SAME = 2,
INODE_NEW = 3,
} pathInfo;
enum {
NYEARS = 2,
};
static int Nyears = NYEARS;
static void
usage (void)
{
fprintf(stderr, "%s\n" "Compiled: %s\n"
"Usage: %s [-n nyears] <backup-root-dir> <file>\n",
VERSION, CompilationDate, PROGNAME);
exit(1);
}
/* Returns 1 if `path' exists, otherwise returns 0.
However, it is regarded as `not exist' if `inode' is non-NULL
and `path' has the same inode number as `*inode'.
*/
pathInfo
doesPathExist (char* path, ino_t* inode)
{
struct stat stbuf;
assert(path);
if (!stat(path, &stbuf)) {
if (!inode) return INODE_NEW; /* inode is NULL, don't check */
if (*inode == 0) { /* no inode info. Initialize it */
*inode = stbuf.st_ino;
return INODE_NEW;
}
if (*inode == stbuf.st_ino) {
return INODE_SAME; /* files are the same */
} else {
*inode = stbuf.st_ino; /* update inode info */
return INODE_CHANGE;
}
}
if (errno == EACCES) {
printf("%s: permission denied\n", path);
exit(1);
}
return INODE_NOPATH;
}
/* Decrement date info in `*ptm', update the date string in `dst',
and check if the .../yyyy/mm directory (which is a part of `dst')
exists. If it does not exist, decrementDate() goes beyound and
tries to find an old .../yyyy/mm directory until Nyears back.
Returns 1 if it exists, otherwise returns 0.
This function is recursive.
*/
int
decrementDate (char* dst, char* date, struct tm* ptm)
{
char* dend; /* end of date string */
int mchange = 0; /* 1 if month changed */
int ychange = 0; /* 1 if year changed */
pathInfo rs; /* return status from doesPathExist() */
assert(dst);
assert(date);
assert(ptm);
if (ptm->tm_mday == 1) {
mchange = 1; /* month changed */
ptm->tm_mday = 31; /* reset mday. Ok to ignore short months */
if (ptm->tm_mon <= 0) { /* year changed */
ychange = 1;
--ptm->tm_year;
ptm->tm_mon = 11; /* reset month */
} else {
--ptm->tm_mon;
}
} else {
--ptm->tm_mday;
}
if (ychange) {
dend = date + 4; /* end ptr of .../yyyy */
assert(*dend == '/');
for (; ptm->tm_yday - ptm->tm_year <= Nyears; --ptm->tm_year) {
sprintf(date, "%04d", ptm->tm_year + 1900);
rs = doesPathExist(dst, NULL);
*dend = '/'; /* sprintf() terminates string */
if (rs) return 1;
}
return 0; /* no old .../yyyy directories */
}
if (mchange) {
dend = date + 7; /* end ptr of .../yyyy/mm */
assert(*dend == '/');
for (; ptm->tm_mon >= 0; --ptm->tm_mon) {
sprintf(date, "%04d/%02d", ptm->tm_year + 1900, ptm->tm_mon + 1);
rs = doesPathExist(dst, NULL);
*dend = '/'; /* sprintf() terminates string */
if (rs) return 1;
}
ptm->tm_mday = 1; /* reset date to 01/01/yyyy */
ptm->tm_mon = 0;
return decrementDate(dst, date, ptm);
} else {
return 1; /* no year/month change */
}
errExit(("should not happen"));
return 0;
}
/* Print backup history of `dst'
*/
void
prHistory (char* dst, char* date, struct tm* ptm)
{
ino_t inode;
pathInfo rs; /* return status */
int len = 0;
char* prev;
char* pd; /* date ptr for `prev' */
assert(dst);
assert(date);
assert(ptm);
prev = malloc(strlen(dst));
if (!prev) {
errSysExit(("malloc(strlen(dst))"));
}
pd = prev + (date - dst);
strcpy(prev, dst);
inode = 0;
for (;;) {
sprintf(date, "%04d/%02d/%02d",
ptm->tm_year + 1900, ptm->tm_mon + 1, ptm->tm_mday);
if (len == 0) {
len = strlen(date);
}
*(date + len) = '/'; /* sprintf() tereminates string */
rs = doesPathExist(dst, &inode);
if (rs == INODE_CHANGE) {
printf("%s\n", prev);
}
if (rs != INODE_NOPATH) {
sprintf(pd, "%04d/%02d/%02d",
ptm->tm_year + 1900, ptm->tm_mon + 1, ptm->tm_mday);
*(pd + len) = '/'; /* sprintf() tereminates string */
}
if (!decrementDate(dst, date, ptm)) break;
}
if (inode) {
printf("%s\n", prev);
}
}
int
main (int argc, char* argv[])
{
char* dst; /* destination path */
char* src; /* source path */
char* date; /* ptr to date string */
int len;
time_t t;
struct tm tm;
if (argc <= 2) {
usage();
}
if (argv[1][0] == '-' && argv[1][1] == 'n') {
if (argc <= 4) {
usage();
}
Nyears = strtol(argv[2], NULL, 10);
argv += 2;
}
dst = argv[1];
src = argv[2];
if (*src != '/') goto errorExit; /* src must be full path */
if (*dst != '/') goto errorExit; /* dest must be full path */
len = strlen(src) - 1;
if (src[len] == '/') { /* strip tail '/' */
src[len] = '\0';
}
len = strlen(dst) - 1;
if (dst[len] == '/') {
dst[len] = '\0';
}
len = strlen(dst) + strlen(DATE) + strlen(src);
dst = malloc(len + 1);
if (!dst) {
errSysExit(("malloc(%d)", len));
}
strcpy(dst, argv[1]);
strcat(dst, DATE);
strcat(dst, src);
date = dst + strlen(argv[1]) + 1;
t = time(NULL);
if (!localtime_r(&t, &tm)) {
errSysExit(("localtime_r()"));
}
tm.tm_yday = tm.tm_year; /* save this year info for prHistory */
prHistory(dst, date, &tm);
free(dst);
exit(0);
errorExit:
fprintf(stderr,
"File, Source and Destination directories must be full path\n");
exit(1);
return 0; /* to make gcc happy */
}