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Merge pull request #4543 from obsidiansystems/indexed-store-path-outputs

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Low level `<drvPath>^<outputName>` installable syntax to match existing `<highLevelInstallable>^<outputNames>` syntax
This commit is contained in:
Eelco Dolstra 2022-12-13 17:22:29 +01:00 committed by GitHub
commit e2a4e7aecd
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6 changed files with 137 additions and 38 deletions
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11
doc/manual/src/release-notes/rl-next.md
View file

@ -14,3 +14,14 @@
'<nixpkgs>' -A hello
# NIX_PATH=nixpkgs=flake:nixpkgs nix-build '<nixpkgs>' -A hello
```
* Allow explicitly selecting outputs in a store derivation installable, just like we can do with other sorts of installables.
For example,
```shell-session
$ nix-build /nix/store/gzaflydcr6sb3567hap9q6srzx8ggdgg-glibc-2.33-78.drv^dev`
```
now works just as
```shell-session
$ nix-build glibc^dev`
```
does already.

77
src/libcmd/installables.cc
View file

@ -399,44 +399,56 @@ static StorePath getDeriver(
struct InstallableStorePath : Installable
{
ref<Store> store;
StorePath storePath;
DerivedPath req;
InstallableStorePath(ref<Store> store, StorePath && storePath)
: store(store), storePath(std::move(storePath)) { }
: store(store),
req(storePath.isDerivation()
? (DerivedPath) DerivedPath::Built {
.drvPath = std::move(storePath),
.outputs = {},
}
: (DerivedPath) DerivedPath::Opaque {
.path = std::move(storePath),
})
{ }
std::string what() const override { return store->printStorePath(storePath); }
InstallableStorePath(ref<Store> store, DerivedPath && req)
: store(store), req(std::move(req))
{ }
std::string what() const override
{
return req.to_string(*store);
}
DerivedPaths toDerivedPaths() override
{
if (storePath.isDerivation()) {
auto drv = store->readDerivation(storePath);
return {
DerivedPath::Built {
.drvPath = storePath,
.outputs = drv.outputNames(),
}
};
} else {
return {
DerivedPath::Opaque {
.path = storePath,
}
};
}
return { req };
}
StorePathSet toDrvPaths(ref<Store> store) override
{
if (storePath.isDerivation()) {
return {storePath};
} else {
return {getDeriver(store, *this, storePath)};
}
return std::visit(overloaded {
[&](const DerivedPath::Built & bfd) -> StorePathSet {
return { bfd.drvPath };
},
[&](const DerivedPath::Opaque & bo) -> StorePathSet {
return { getDeriver(store, *this, bo.path) };
},
}, req.raw());
}
std::optional<StorePath> getStorePath() override
{
return storePath;
return std::visit(overloaded {
[&](const DerivedPath::Built & bfd) {
return bfd.drvPath;
},
[&](const DerivedPath::Opaque & bo) {
return bo.path;
},
}, req.raw());
}
};
@ -803,7 +815,22 @@ std::vector<std::shared_ptr<Installable>> SourceExprCommand::parseInstallables(
for (auto & s : ss) {
std::exception_ptr ex;
if (s.find('/') != std::string::npos) {
auto found = s.rfind('^');
if (found != std::string::npos) {
try {
result.push_back(std::make_shared<InstallableStorePath>(
store,
DerivedPath::Built::parse(*store, s.substr(0, found), s.substr(found + 1))));
continue;
} catch (BadStorePath &) {
} catch (...) {
if (!ex)
ex = std::current_exception();
}
}
found = s.find('/');
if (found != std::string::npos) {
try {
result.push_back(std::make_shared<InstallableStorePath>(store, store->followLinksToStorePath(s)));
continue;

15
src/libstore/derived-path.cc
View file

@ -78,15 +78,16 @@ DerivedPath::Opaque DerivedPath::Opaque::parse(const Store & store, std::string_
return {store.parseStorePath(s)};
}
DerivedPath::Built DerivedPath::Built::parse(const Store & store, std::string_view s)
DerivedPath::Built DerivedPath::Built::parse(const Store & store, std::string_view drvS, std::string_view outputsS)
{
size_t n = s.find("!");
assert(n != s.npos);
auto drvPath = store.parseStorePath(s.substr(0, n));
auto outputsS = s.substr(n + 1);
auto drvPath = store.parseStorePath(drvS);
std::set<std::string> outputs;
if (outputsS != "*")
if (outputsS != "*") {
outputs = tokenizeString<std::set<std::string>>(outputsS, ",");
if (outputs.empty())
throw Error(
"Explicit list of wanted outputs '%s' must not be empty. Consider using '*' as a wildcard meaning all outputs if no output in particular is wanted.", outputsS);
}
return {drvPath, outputs};
}
@ -95,7 +96,7 @@ DerivedPath DerivedPath::parse(const Store & store, std::string_view s)
size_t n = s.find("!");
return n == s.npos
? (DerivedPath) DerivedPath::Opaque::parse(store, s)
: (DerivedPath) DerivedPath::Built::parse(store, s);
: (DerivedPath) DerivedPath::Built::parse(store, s.substr(0, n), s.substr(n + 1));
}
RealisedPath::Set BuiltPath::toRealisedPaths(Store & store) const

2
src/libstore/derived-path.hh
View file

@ -47,7 +47,7 @@ struct DerivedPathBuilt {
std::set<std::string> outputs;
std::string to_string(const Store & store) const;
static DerivedPathBuilt parse(const Store & store, std::string_view);
static DerivedPathBuilt parse(const Store & store, std::string_view, std::string_view);
nlohmann::json toJSON(ref<Store> store) const;
bool operator < (const DerivedPathBuilt & b) const

16
src/nix/nix.md
View file

@ -164,6 +164,13 @@ operate are determined as follows:
…
```
and likewise, using a store path to a "drv" file to specify the derivation:
```console
# nix build '/nix/store/gzaflydcr6sb3567hap9q6srzx8ggdgg-glibc-2.33-78.drv^dev,static'
…
```
* You can also specify that *all* outputs should be used using the
syntax *installable*`^*`. For example, the following shows the size
of all outputs of the `glibc` package in the binary cache:
@ -177,6 +184,12 @@ operate are determined as follows:
/nix/store/q6580lr01jpcsqs4r5arlh4ki2c1m9rv-glibc-2.33-123-dev 44200560
```
and likewise, using a store path to a "drv" file to specify the derivation:
```console
# nix path-info -S '/nix/store/gzaflydcr6sb3567hap9q6srzx8ggdgg-glibc-2.33-78.drv^*'
…
```
* If you didn't specify the desired outputs, but the derivation has an
attribute `meta.outputsToInstall`, Nix will use those outputs. For
example, since the package `nixpkgs#libxml2` has this attribute:
@ -189,6 +202,9 @@ operate are determined as follows:
a command like `nix shell nixpkgs#libxml2` will provide only those
two outputs by default.
Note that a store derivation (given by `.drv` file store path) doesn't have
any attributes like `meta`, and thus this case doesn't apply to it.
* Otherwise, Nix will use all outputs of the derivation.
# Nix stores

54
tests/build.sh
View file

@ -8,13 +8,15 @@ set -o pipefail
nix build -f multiple-outputs.nix --json a b --no-link | jq --exit-status '
(.[0] |
(.drvPath | match(".*multiple-outputs-a.drv")) and
(.outputs | keys | length == 2) and
(.outputs.first | match(".*multiple-outputs-a-first")) and
(.outputs.second | match(".*multiple-outputs-a-second")))
(.outputs |
(keys | length == 2) and
(.first | match(".*multiple-outputs-a-first")) and
(.second | match(".*multiple-outputs-a-second"))))
and (.[1] |
(.drvPath | match(".*multiple-outputs-b.drv")) and
(.outputs | keys | length == 1) and
(.outputs.out | match(".*multiple-outputs-b")))
(.outputs |
(keys | length == 1) and
(.out | match(".*multiple-outputs-b"))))
'
# Test output selection using the '^' syntax.
@ -56,6 +58,48 @@ nix build -f multiple-outputs.nix --json 'e^*' --no-link | jq --exit-status '
(.outputs | keys == ["a", "b", "c"]))
'
# Test building from raw store path to drv not expression.
drv=$(nix eval -f multiple-outputs.nix --raw a.drvPath)
if nix build "$drv^not-an-output" --no-link --json; then
fail "'not-an-output' should fail to build"
fi
if nix build "$drv^" --no-link --json; then
fail "'empty outputs list' should fail to build"
fi
if nix build "$drv^*nope" --no-link --json; then
fail "'* must be entire string' should fail to build"
fi
nix build "$drv^first" --no-link --json | jq --exit-status '
(.[0] |
(.drvPath | match(".*multiple-outputs-a.drv")) and
(.outputs |
(keys | length == 1) and
(.first | match(".*multiple-outputs-a-first")) and
(has("second") | not)))
'
nix build "$drv^first,second" --no-link --json | jq --exit-status '
(.[0] |
(.drvPath | match(".*multiple-outputs-a.drv")) and
(.outputs |
(keys | length == 2) and
(.first | match(".*multiple-outputs-a-first")) and
(.second | match(".*multiple-outputs-a-second"))))
'
nix build "$drv^*" --no-link --json | jq --exit-status '
(.[0] |
(.drvPath | match(".*multiple-outputs-a.drv")) and
(.outputs |
(keys | length == 2) and
(.first | match(".*multiple-outputs-a-first")) and
(.second | match(".*multiple-outputs-a-second"))))
'
# Make sure that `--impure` works (regression test for https://github.com/NixOS/nix/issues/6488)
nix build --impure -f multiple-outputs.nix --json e --no-link | jq --exit-status '
(.[0] |