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#include "stdinc.h"
#include "dat.h"
#include "fns.h"
uchar buf[65536];
void
usage(void)
{
fprint(2, "usage: fossil/epoch fs [new-low-epoch]\n");
threadexitsall("usage");
}
void
threadmain(int argc, char **argv)
{
int fd;
Header h;
Super s;
ARGBEGIN{
default:
usage();
}ARGEND
if(argc == 0 || argc > 2)
usage();
if((fd = open(argv[0], argc==2 ? ORDWR : OREAD)) < 0)
sysfatal("open %s: %r", argv[0]);
if(pread(fd, buf, HeaderSize, HeaderOffset) != HeaderSize)
sysfatal("reading header: %r");
if(!headerUnpack(&h, buf))
sysfatal("unpacking header: %r");
if(pread(fd, buf, h.blockSize, (vlong)h.super*h.blockSize) != h.blockSize)
sysfatal("reading super block: %r");
if(!superUnpack(&s, buf))
sysfatal("unpacking super block: %r");
print("epoch %d\n", s.epochLow);
if(argc == 2){
s.epochLow = strtoul(argv[1], 0, 0);
superPack(&s, buf);
if(pwrite(fd, buf, h.blockSize, (vlong)h.super*h.blockSize) != h.blockSize)
sysfatal("writing super block: %r");
}
threadexitsall(0);
}
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