upstream/mercurial-mirror Files · contrib/fuzz/bdiff.cc

copies: follow copies across merge base without source file (issue6163)...

copies: follow copies across merge base without source file (issue6163) As in the previous patch, consider these two histories: @ 4 'rename x to y' | o 3 'add x again' | o 2 'remove x' | | o 1 'modify x' |/ o 0 'add x' @ 4 'rename x to y' | o 3 'add x again' | | o 2 'modify x' | | | o 1 'add x' |/ o 0 'base' We trace copies from the 'modify x' commit to commit 4 by going via the merge base (commit 0). When tracing file 'y' (_tracefile()) in the first case, we immediately find the rename from 'x'. We check to see if 'x' exists in the merge base, which it does, so we consider it a valid copy. In the second case, 'x' does not exist in the merge base, so it's not considered a valid copy. As a workaround, this patch makes it so we also attempt the check in mergecopies's base commit (commit 1 in the second case). That feels pretty ugly to me, but I don't have any better ideas. Note that we actually also check not only that the filename matches, but also that the file's nodeid matches. I don't know why we do that, but it was like that already before I rewrote mergecopies(). That means that the rebase will still fail in cases like this (again, it already failed before my rewrite): @ 4 'rename x to y' | o 3 'add x again with content X2' | o 2 'remove x' | | o 1 'modify x to content X2' |/ o 1 'modify x to content X1' | o 0 'add x with content X0' Differential Revision: https://phab.mercurial-scm.org/D6604

Augie Fackler - - Load All Authors

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      /*

       * bdiff.cc - fuzzer harness for bdiff.c

       *

       * Copyright 2018, Google Inc.

       *

       * This software may be used and distributed according to the terms of

       * the GNU General Public License, incorporated herein by reference.

       */

      #include <memory>

      #include <stdlib.h>

      #include "fuzzutil.h"

      extern "C" {

      #include "bdiff.h"

      int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)

      {

      	auto maybe_inputs = SplitInputs(Data, Size);

      	if (!maybe_inputs) {

      		return 0;

      	}

      	auto inputs = std::move(maybe_inputs.value());

      	struct bdiff_line *a, *b;

      	int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a);

      	int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b);

      	struct bdiff_hunk l;

      	bdiff_diff(a, an, b, bn, &l);

      	free(a);

      	free(b);

      	bdiff_freehunks(l.next);

      	return 0; // Non-zero return values are reserved for future use.

      }

      #ifdef HG_FUZZER_INCLUDE_MAIN

      int main(int argc, char **argv)

      {

      	const char data[] = "asdf";

      	return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);

      }

      #endif

      } // extern "C"

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				/*
				* bdiff.cc - fuzzer harness for bdiff.c
				*
				* Copyright 2018, Google Inc.
				*
				* This software may be used and distributed according to the terms of
				* the GNU General Public License, incorporated herein by reference.
				*/
				#include <memory>
				#include <stdlib.h>

				#include "fuzzutil.h"

				extern "C" {
				#include "bdiff.h"

				int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
				{
				auto maybe_inputs = SplitInputs(Data, Size);
				if (!maybe_inputs) {
				return 0;
				}
				auto inputs = std::move(maybe_inputs.value());

				struct bdiff_line a, b;
				int an = bdiff_splitlines(inputs.left.get(), inputs.left_size, &a);
				int bn = bdiff_splitlines(inputs.right.get(), inputs.right_size, &b);
				struct bdiff_hunk l;
				bdiff_diff(a, an, b, bn, &l);
				free(a);
				free(b);
				bdiff_freehunks(l.next);
				return 0; // Non-zero return values are reserved for future use.
				}

				#ifdef HG_FUZZER_INCLUDE_MAIN
				int main(int argc, char **argv)
				{
				const char data[] = "asdf";
				return LLVMFuzzerTestOneInput((const uint8_t *)data, 4);
				}
				#endif

				} // extern "C"