fetchClosure: Docs and error message improvements
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
This commit is contained in:
Robert Hensing
Robert Hensing
parent
50de11d662
commit
40052c7613
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@ -2,7 +2,7 @@
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- [`nix-channel`](../command-ref/nix-channel.md) now supports a `--list-generations` subcommand
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- The function [`builtins.fetchClosure`](../language/builtins.md#builtins-fetchClosure) can now fetch input-addressed paths in [pure mode](../command-ref/conf-file.md#conf-pure-eval).
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* The function [`builtins.fetchClosure`](../language/builtins.md#builtins-fetchClosure) can now fetch input-addressed paths in [pure evaluation mode](../command-ref/conf-file.md#conf-pure-eval), as those are not impure.
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- Nix now allows unprivileged/[`allowed-users`](../command-ref/conf-file.md#conf-allowed-users) to sign paths.
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Previously, only [`trusted-users`](../command-ref/conf-file.md#conf-trusted-users) users could sign paths.
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@ -8,11 +8,11 @@ namespace nix {
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/**
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* Handler for the content addressed case.
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*
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* @param state The evaluator state and store to write to.
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* @param fromStore The store containing the path to rewrite.
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* @param fromPath The source path to be rewritten.
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* @param toPathMaybe The path to write the rewritten path to. If empty, the error shows the actual path.
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* @param v The return `Value`
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* @param state Evaluator state and store to write to.
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* @param fromStore Store containing the path to rewrite.
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* @param fromPath Source path to be rewritten.
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* @param toPathMaybe Path to write the rewritten path to. If empty, the error shows the actual path.
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* @param v Return `Value`
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*/
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static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Store & fromStore, const StorePath & fromPath, const std::optional<StorePath> & toPathMaybe, Value &v) {
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@ -31,8 +31,8 @@ static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Stor
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if (!toPathMaybe)
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throw Error({
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.msg = hintfmt(
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"rewriting '%s' to content-addressed form yielded '%s'; "
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"please set this in the 'toPath' attribute passed to 'fetchClosure'",
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"rewriting '%s' to content-addressed form yielded '%s'\n"
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"Use this value for the 'toPath' attribute passed to 'fetchClosure'",
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state.store->printStorePath(fromPath),
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state.store->printStorePath(rewrittenPath)),
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.errPos = state.positions[pos]
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@ -49,7 +49,9 @@ static void runFetchClosureWithRewrite(EvalState & state, const PosIdx pos, Stor
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// We don't perform the rewriting when outPath already exists, as an optimisation.
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// However, we can quickly detect a mistake if the toPath is input addressed.
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throw Error({
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.msg = hintfmt("The 'toPath' value '%s' is input addressed, so it can't possibly be the result of rewriting. You may set 'toPath' to an empty string to figure out the correct path.",
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.msg = hintfmt(
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"The 'toPath' value '%s' is input-addressed, so it can't possibly be the result of rewriting to a content-addressed path.\n\n"
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"Set 'toPath' to an empty string to make Nix report the correct content-addressed path.",
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state.store->printStorePath(toPath)),
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.errPos = state.positions[pos]
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});
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@ -70,7 +72,9 @@ static void runFetchClosureWithContentAddressedPath(EvalState & state, const Pos
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if (!info->isContentAddressed(*state.store)) {
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throw Error({
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.msg = hintfmt("The 'fromPath' value '%s' is input addressed, but input addressing was not requested. If you do intend to return an input addressed store path, add 'inputAddressed = true;' to the 'fetchClosure' arguments. Note that content addressing does not require users to configure a trusted binary cache public key on their systems, and is therefore preferred.",
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.msg = hintfmt(
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"The 'fromPath' value '%s' is input-addressed, but 'inputAddressed' is set to 'false' (default).\n\n"
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"If you do intend to fetch an input-addressed store path, add 'inputAddressed = true;' to the 'fetchClosure' arguments. Note that content addressing does not require users to configure a trusted binary cache public key on their systems, and is therefore preferred.",
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state.store->printStorePath(fromPath)),
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.errPos = state.positions[pos]
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});
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@ -91,7 +95,9 @@ static void runFetchClosureWithInputAddressedPath(EvalState & state, const PosId
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if (info->isContentAddressed(*state.store)) {
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throw Error({
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.msg = hintfmt("The 'fetchClosure' result, '%s' is not input addressed, despite 'inputAddressed' being set to true. It is preferable to return a content addressed path, so remove the 'inputAddressed' attribute to ensure content addressing is used in the future",
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.msg = hintfmt(
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"The store object referred to by 'fromPath' at '%s' is not input-addressed, but 'inputAddressed' is set to 'true'.\n\n"
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"Remove the 'inputAddressed' attribute (it defaults to 'false') to expect 'fromPath' to be content-addressed",
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state.store->printStorePath(fromPath)),
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.errPos = state.positions[pos]
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});
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@ -202,11 +208,13 @@ static RegisterPrimOp primop_fetchClosure({
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.name = "__fetchClosure",
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.args = {"args"},
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.doc = R"(
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Fetch a Nix store closure from a binary cache.
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Fetch a store path [closure](@docroot@/glossary.md#gloss-closure) from a binary cache.
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This function can be used in three ways:
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- Fetch any store path and rewrite it to a fully content-addressed store path. Example:
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- Fetch any store path and rewrite it to a fully content-addressed store path.
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Example:
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```nix
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builtins.fetchClosure {
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@ -218,6 +226,8 @@ static RegisterPrimOp primop_fetchClosure({
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- Fetch a content-addressed store path.
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Example:
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```nix
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builtins.fetchClosure {
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fromStore = "https://cache.nixos.org";
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@ -227,6 +237,8 @@ static RegisterPrimOp primop_fetchClosure({
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- Fetch an [input-addressed store path](@docroot@/glossary.md#gloss-input-addressed-store-object) as is. This depends on user configuration, which is less preferable.
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Example:
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```nix
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builtins.fetchClosure {
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fromStore = "https://cache.nixos.org";
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@ -244,7 +256,7 @@ static RegisterPrimOp primop_fetchClosure({
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By rewriting the store paths, you can add the contents to any store without requiring that you or perhaps your users configure any extra trust.
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To find out the correct value for `toPath` given a `fromPath`,
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you can use [`nix store make-content-addressed`](@docroot@/command-ref/new-cli/nix3-store-make-content-addressed.md):
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use [`nix store make-content-addressed`](@docroot@/command-ref/new-cli/nix3-store-make-content-addressed.md):
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```console
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# nix store make-content-addressed --from https://cache.nixos.org /nix/store/r2jd6ygnmirm2g803mksqqjm4y39yi6i-git-2.33.1
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@ -52,7 +52,7 @@ if [[ "$NIX_REMOTE" != "daemon" ]]; then
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fromStore = \"file://$cacheDir\";
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fromPath = $nonCaPath;
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}
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" | grepQuiet -E "The .fromPath. value .* is input addressed, but input addressing was not requested. If you do intend to return an input addressed store path, add .inputAddressed = true;. to the .fetchClosure. arguments."
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" | grepQuiet -E "The .fromPath. value .* is input-addressed, but .inputAddressed. is set to .false."
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[ -e $nonCaPath ]
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