Subversion Repositories planix.SVN

#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");
        exits("usage");
}

void
main(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");
        }
        exits(0);
}