mirror of
https://github.com/NixOS/nix.git
synced 2025-11-22 02:09:36 +01:00
d21e3f88ec
SHA-256 is Git's next hash algorithm. The world is still basically stuck on SHA-1 with git, but shouldn't be. We can at least do our part to get ready. On the C++ implementation side, only a little bit of generalization was needed, and that was fairly straight-forward. The tests (unit and system) were actually bigger, and care was taken to make sure they were all cover both algorithms equally.
35 lines
1.2 KiB
Bash
Executable file
35 lines
1.2 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -eu -o pipefail
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TEST_ROOT=$(realpath "${TMPDIR:-/tmp}/nix-test")/git-hashing/check-data
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export TEST_ROOT
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mkdir -p "$TEST_ROOT"
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for hash in sha1 sha256; do
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repo="$TEST_ROOT/scratch-$hash"
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git init "$repo" --object-format="$hash"
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git -C "$repo" config user.email "you@example.com"
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git -C "$repo" config user.name "Your Name"
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# `-w` to write for tree test
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freshlyAddedHash=$(git -C "$repo" hash-object -w -t blob --stdin < "./hello-world.bin")
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encodingHash=$("${hash}sum" -b < "./hello-world-blob.bin" | sed 's/ .*//')
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# If the hashes match, then `hello-world-blob.bin` must be the encoding
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# of `hello-world.bin`.
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[[ "$encodingHash" == "$freshlyAddedHash" ]]
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# Create empty directory object for tree test
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echo -n | git -C "$repo" hash-object -w -t tree --stdin
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# Relies on both child hashes already existing in the git store
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tree=tree-${hash}
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freshlyAddedHash=$(git -C "$repo" mktree < "${tree}.txt")
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encodingHash=$("${hash}sum" -b < "${tree}.bin" | sed 's/ .*//')
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# If the hashes match, then `tree.bin` must be the encoding of the
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# directory denoted by `tree.txt` interpreted as git directory listing.
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[[ "$encodingHash" == "$freshlyAddedHash" ]]
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done
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