File: copy-sparse.py

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#!/usr/bin/env python

import argparse
import re
import sys


def main():
    argp = argparse.ArgumentParser()
    argp.add_argument("infile", type=argparse.FileType("rb"), help="Input vmcore file")
    argp.add_argument(
        "outfile", type=argparse.FileType("wb"), help="Output vmcore file"
    )
    args = argp.parse_args()

    inf = args.infile
    outf = args.outfile
    line_re = re.compile(r"^% RD: (\d+) (\d+)")

    # copy the first chunk that usually includes ELF headers
    # (not output by patched libfbsdvmcore since libelf reads this)
    outf.write(inf.read(1024))

    for l in sys.stdin:
        m = line_re.match(l)
        if m is None:
            continue
        offset, size = [int(x) for x in m.groups()]

        inf.seek(offset)
        outf.seek(offset)
        outf.write(inf.read(size))


if __name__ == "__main__":
    main()