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nix hash convert: added
This deviated from the proposal! See comments on the issue. https://github.com/NixOS/nix/issues/8876
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2 changed files with 81 additions and 1 deletions
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@ -132,12 +132,75 @@ struct CmdToBase : Command
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}
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};
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/**
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* `nix hash convert`
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*/
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struct CmdHashConvert : Command
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{
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std::optional<HashFormat> from;
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HashFormat to;
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std::optional<HashType> type;
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std::vector<std::string> hashStrings;
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CmdHashConvert(): to(HashFormat::SRI) {
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addFlag({
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.longName = "from",
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// TODO: List format choices. Maybe introduce a constant?
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.description = "The format of the input hash.",
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.labels = {"hash format"},
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.handler = {[this](std::string str) {
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from = parseHashFormat(str);
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}},
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});
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addFlag({
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.longName = "to",
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// TODO: List format choices. Maybe introduce a constant?
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.description = "The format of the output hash.",
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.labels = {"hash format"},
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.handler = {[this](std::string str) {
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to = parseHashFormat(str);
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}},
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});
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addFlag({
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.longName = "type",
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.description = "Specify the type if it can't be auto-detected.",
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.labels = {"hash type"},
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.handler = {[this](std::string str) {
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type = parseHashType(str);
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}},
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});
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expectArgs({
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.label = "hashes",
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.handler = {&hashStrings},
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});
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}
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std::string description() override
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{
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return "convert between different hash formats, e.g. base16 and sri.";
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}
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Category category() override { return catUtility; }
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void run() override {
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for (const auto& s: hashStrings) {
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Hash h = Hash::parseAny(s, type);
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if (from && h.to_string(*from, from == HashFormat::SRI) != s) {
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auto from_as_string = printHashFormat(*from);
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throw BadHash("input hash '%s' does not have the expected format '--from %s'", s, from_as_string);
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}
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logger->cout(h.to_string(to, to == HashFormat::SRI));
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}
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}
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};
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struct CmdHash : NixMultiCommand
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{
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CmdHash()
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: NixMultiCommand(
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"hash",
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{
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{"convert", []() { return make_ref<CmdHashConvert>();}},
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{"file", []() { return make_ref<CmdHashBase>(FileIngestionMethod::Flat);; }},
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{"path", []() { return make_ref<CmdHashBase>(FileIngestionMethod::Recursive); }},
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{"to-base16", []() { return make_ref<CmdToBase>(HashFormat::Base16); }},
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@ -81,24 +81,41 @@ rm $TEST_ROOT/hash-path/hello
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ln -s x $TEST_ROOT/hash-path/hello
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try2 md5 "f78b733a68f5edbdf9413899339eaa4a"
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# Conversion.
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# Conversion with `nix hash` `nix-hash` and `nix hash convert`
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try3() {
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# $1 = hash type
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# $2 = expected hash in base16
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# $3 = expected hash in base32
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# $4 = expected hash in base64
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h64=$(nix hash convert --type "$1" --to base64 "$2")
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[ "$h64" = "$4" ]
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h64=$(nix-hash --type "$1" --to-base64 "$2")
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[ "$h64" = "$4" ]
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# Deprecated experiment
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h64=$(nix hash to-base64 --type "$1" "$2")
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[ "$h64" = "$4" ]
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sri=$(nix hash convert --type "$1" --to sri "$2")
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[ "$sri" = "$1-$4" ]
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sri=$(nix-hash --type "$1" --to-sri "$2")
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[ "$sri" = "$1-$4" ]
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sri=$(nix hash to-sri --type "$1" "$2")
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[ "$sri" = "$1-$4" ]
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h32=$(nix hash convert --type "$1" --to base32 "$2")
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[ "$h32" = "$3" ]
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h32=$(nix-hash --type "$1" --to-base32 "$2")
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[ "$h32" = "$3" ]
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h32=$(nix hash to-base32 --type "$1" "$2")
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[ "$h32" = "$3" ]
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h16=$(nix-hash --type "$1" --to-base16 "$h32")
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[ "$h16" = "$2" ]
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h16=$(nix hash convert --type "$1" --to base16 "$h64")
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[ "$h16" = "$2" ]
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h16=$(nix hash to-base16 --type "$1" "$h64")
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[ "$h16" = "$2" ]
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h16=$(nix hash convert --to base16 "$sri")
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[ "$h16" = "$2" ]
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h16=$(nix hash to-base16 "$sri")
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[ "$h16" = "$2" ]
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}
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