dedup

deduplicating backup program
git clone git://git.2f30.org/dedup
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dup-check.c (2750B)

      1 #include <sys/types.h>
      2 #include <sys/stat.h>
      3 
      4 #include <err.h>
      5 #include <fcntl.h>
      6 #include <limits.h>
      7 #include <stdio.h>
      8 #include <stdlib.h>
      9 #include <unistd.h>
     10 
     11 #include <sodium.h>
     12 
     13 #include "arg.h"
     14 #include "block.h"
     15 #include "config.h"
     16 #include "key.h"
     17 #include "lock.h"
     18 #include "misc.h"
     19 #include "snap.h"
     20 #include "state.h"
     21 
     22 struct param param;
     23 int verbose;
     24 char *argv0;
     25 
     26 static void
     27 loadstate(char *repo)
     28 {
     29 	char path[PATH_MAX];
     30 	int fd;
     31 
     32 	if (snprintf(path, sizeof(path), "%s/state", repo) >= sizeof(path))
     33 		errx(1, "snprintf: %s: path too long", path);
     34 	fd = open(path, O_RDONLY);
     35 	if (fd < 0)
     36 		err(1, "open: %s", path);
     37 	if (readstate(fd, &param) < 0)
     38 		printerr("readstate: %s", path);
     39 	if (close(fd) < 0)
     40 		err(1, "close: %s", path);
     41 }
     42 
     43 static void
     44 loadkey(char *keyfile)
     45 {
     46 	int fd;
     47 
     48 	if (keyfile == NULL)
     49 		return;
     50 
     51 	fd = open(keyfile, O_RDONLY);
     52 	if (fd < 0)
     53 		err(1, "open: %s", keyfile);
     54 	if (readkey(fd, param.key, sizeof(param.key)) < 0)
     55 		printerr("readkey: %s", keyfile);
     56 	param.keyloaded = 1;
     57 	if (close(fd) < 0)
     58 		err(1, "close: %s", keyfile);
     59 }
     60 
     61 static void
     62 check(struct sctx *sctx, struct bctx *bctx)
     63 {
     64 	unsigned char md[MDSIZE];
     65 	int n;
     66 
     67 	if (sodium_init() < 0)
     68 		errx(1, "sodium_init: failed");
     69 
     70 	while ((n = sget(sctx, md)) == MDSIZE) {
     71 		char mdstr[MDSIZE * 2 + 1];
     72 		int r;
     73 
     74 		if ((r = bcheck(bctx, md)) < 0) {
     75 			printerr("bcheck");
     76 		} else if (r > 0) {
     77 			sodium_bin2hex(mdstr, sizeof(mdstr), md, MDSIZE);
     78 			puts(mdstr);
     79 		}
     80 	}
     81 	if (n < 0)
     82 		printerr("sget");
     83 }
     84 
     85 static void
     86 usage(void)
     87 {
     88 	fprintf(stderr, "usage: %s [-v] [-k keyfile] [-r repo] name\n", argv0);
     89 	exit(1);
     90 }
     91 
     92 int
     93 main(int argc, char *argv[])
     94 {
     95 	char spath[PATH_MAX];
     96 	char bpath[PATH_MAX];
     97 	struct sctx *sctx;
     98 	struct bctx *bctx;
     99 	char *keyfile = NULL;
    100 	char *repo = ".";
    101 	int lfd;
    102 
    103 	ARGBEGIN {
    104 	case 'k':
    105 		keyfile = EARGF(usage());
    106 		break;
    107 	case 'r':
    108 		repo = EARGF(usage());
    109 		break;
    110 	case 'v':
    111 		verbose++;
    112 		break;
    113 	default:
    114 		usage();
    115 	} ARGEND
    116 
    117 	if (argc != 1)
    118 		usage();
    119 
    120 	if (snprintf(spath, sizeof(spath), "%s/archive/%s",
    121 	             repo, argv[0]) >= sizeof(spath))
    122 		errx(1, "snprintf: %s: path too long", spath);
    123 	if (snprintf(bpath, sizeof(bpath), "%s/storage",
    124 	             repo) >= sizeof(bpath))
    125 		errx(1, "snprintf: %s: path too long", bpath);
    126 
    127 	if ((lfd = lockrepo(repo)) < 0)
    128 		errx(1, "failed to lock repository");
    129 
    130 	loadkey(keyfile);
    131 	loadstate(repo);
    132 
    133 	if (sopen(spath, S_READ, 0600, &sctx) < 0)
    134 		printerr("sopen: %s", spath);
    135 	if (bopen(bpath, B_READ, 0600, &bctx) < 0)
    136 		printerr("bopen: %s", bpath);
    137 
    138 	check(sctx, bctx);
    139 
    140 	if (bclose(bctx) < 0)
    141 		printerr("bclose: %s", bpath);
    142 	if (sclose(sctx) < 0)
    143 		printerr("sclose: %s", spath);
    144 
    145 	if (unlockrepo(lfd) < 0)
    146 		errx(1, "failed to unlock repository");
    147 	
    148 	return 0;
    149 }