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Allow writing to the private index file mapping.
We now modify the in-memory copy of the index file in "diff-cache", so we need to add PROT_WRITE.
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@ -198,7 +198,7 @@ int read_cache(void)
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size = st.st_size;
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errno = EINVAL;
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if (size >= sizeof(struct cache_header) + 20)
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map = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
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map = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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}
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close(fd);
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if (-1 == (int)(long)map)
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