1 6f4d00ee 2013-09-23 0intro #include "stdinc.h"
 2 6f4d00ee 2013-09-23 0intro #include "dat.h"
 3 6f4d00ee 2013-09-23 0intro #include "fns.h"
 4 6f4d00ee 2013-09-23 0intro 
 5 6f4d00ee 2013-09-23 0intro uchar buf[65536];
 6 6f4d00ee 2013-09-23 0intro 
 7 6f4d00ee 2013-09-23 0intro void
 8 6f4d00ee 2013-09-23 0intro usage(void)
 9 6f4d00ee 2013-09-23 0intro {
10 6f4d00ee 2013-09-23 0intro 	fprint(2, "usage: fossil/epoch fs [new-low-epoch]\n");
11 4b576658 2013-09-23 0intro 	threadexitsall("usage");
12 6f4d00ee 2013-09-23 0intro }
13 6f4d00ee 2013-09-23 0intro 
14 6f4d00ee 2013-09-23 0intro void
15 4b576658 2013-09-23 0intro threadmain(int argc, char **argv)
16 6f4d00ee 2013-09-23 0intro {
17 6f4d00ee 2013-09-23 0intro 	int fd;
18 6f4d00ee 2013-09-23 0intro 	Header h;
19 6f4d00ee 2013-09-23 0intro 	Super s;
20 6f4d00ee 2013-09-23 0intro 
21 6f4d00ee 2013-09-23 0intro 	ARGBEGIN{
22 6f4d00ee 2013-09-23 0intro 	default:
23 6f4d00ee 2013-09-23 0intro 		usage();
24 6f4d00ee 2013-09-23 0intro 	}ARGEND
25 6f4d00ee 2013-09-23 0intro 
26 6f4d00ee 2013-09-23 0intro 	if(argc == 0 || argc > 2)
27 6f4d00ee 2013-09-23 0intro 		usage();
28 6f4d00ee 2013-09-23 0intro 
29 6f4d00ee 2013-09-23 0intro 	if((fd = open(argv[0], argc==2 ? ORDWR : OREAD)) < 0)
30 6f4d00ee 2013-09-23 0intro 		sysfatal("open %s: %r", argv[0]);
31 6f4d00ee 2013-09-23 0intro 
32 6f4d00ee 2013-09-23 0intro 	if(pread(fd, buf, HeaderSize, HeaderOffset) != HeaderSize)
33 6f4d00ee 2013-09-23 0intro 		sysfatal("reading header: %r");
34 6f4d00ee 2013-09-23 0intro 	if(!headerUnpack(&h, buf))
35 6f4d00ee 2013-09-23 0intro 		sysfatal("unpacking header: %r");
36 6f4d00ee 2013-09-23 0intro 
37 6f4d00ee 2013-09-23 0intro 	if(pread(fd, buf, h.blockSize, (vlong)h.super*h.blockSize) != h.blockSize)
38 6f4d00ee 2013-09-23 0intro 		sysfatal("reading super block: %r");
39 6f4d00ee 2013-09-23 0intro 
40 6f4d00ee 2013-09-23 0intro 	if(!superUnpack(&s, buf))
41 6f4d00ee 2013-09-23 0intro 		sysfatal("unpacking super block: %r");
42 6f4d00ee 2013-09-23 0intro 
43 6f4d00ee 2013-09-23 0intro 	print("epoch %d\n", s.epochLow);
44 6f4d00ee 2013-09-23 0intro 	if(argc == 2){
45 6f4d00ee 2013-09-23 0intro 		s.epochLow = strtoul(argv[1], 0, 0);
46 6f4d00ee 2013-09-23 0intro 		superPack(&s, buf);
47 6f4d00ee 2013-09-23 0intro 		if(pwrite(fd, buf, h.blockSize, (vlong)h.super*h.blockSize) != h.blockSize)
48 6f4d00ee 2013-09-23 0intro 			sysfatal("writing super block: %r");
49 6f4d00ee 2013-09-23 0intro 	}
50 4b576658 2013-09-23 0intro 	threadexitsall(0);
51 6f4d00ee 2013-09-23 0intro }