18 lines
697 B
Bash
18 lines
697 B
Bash
# Shell library for working with "chunk" files (commit-graph, midx, etc).
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# corrupt_chunk_file <fn> <chunk> <offset> <bytes>
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#
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# Corrupt a chunk-based file (like a commit-graph) by overwriting the bytes
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# found in the chunk specified by the 4-byte <chunk> identifier. If <offset> is
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# "clear", replace the chunk entirely. Otherwise, overwrite data <offset> bytes
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# into the chunk.
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#
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# The <bytes> are interpreted as pairs of hex digits (so "000000FE" would be
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# big-endian 254).
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corrupt_chunk_file () {
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fn=$1; shift
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perl "$TEST_DIRECTORY"/lib-chunk/corrupt-chunk-file.pl \
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"$@" <"$fn" >"$fn.tmp" &&
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# some vintages of macOS 'mv' fails to overwrite a read-only file.
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mv -f "$fn.tmp" "$fn"
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}
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