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