60b7121d2c
We want to be able to write down `foo.drv^bar.drv^baz`:
`foo.drv^bar.drv` is the dynamic derivation (since it is itself a
derivation output, `bar.drv` from `foo.drv`).
To that end, we create `Single{Derivation,BuiltPath}` types, that are
very similar except instead of having multiple outputs (in a set or
map), they have a single one. This is for everything to the left of the
rightmost `^`.
`NixStringContextElem` has an analogous change, and now can reuse
`SingleDerivedPath` at the top level. In fact, if we ever get rid of
`DrvDeep`, `NixStringContextElem` could be replaced with
`SingleDerivedPath` entirely!
Important note: some JSON formats have changed.
We already can *produce* dynamic derivations, but we can't refer to them
directly. Today, we can merely express building or example at the top
imperatively over time by building `foo.drv^bar.drv`, and then with a
second nix invocation doing `<result-from-first>^baz`, but this is not
declarative. The ethos of Nix of being able to write down the full plan
everything you want to do, and then execute than plan with a single
command, and for that we need the new inductive form of these types.
Co-authored-by: Robert Hensing <roberth@users.noreply.github.com>
Co-authored-by: Valentin Gagarin <valentin.gagarin@tweag.io>
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
#include "command.hh"
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#include "common-args.hh"
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#include "shared.hh"
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#include "store-api.hh"
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#include "log-store.hh"
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#include "progress-bar.hh"
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using namespace nix;
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struct CmdLog : InstallableCommand
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{
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std::string description() override
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{
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return "show the build log of the specified packages or paths, if available";
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}
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std::string doc() override
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{
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return
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#include "log.md"
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;
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}
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Category category() override { return catSecondary; }
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void run(ref<Store> store, ref<Installable> installable) override
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{
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settings.readOnlyMode = true;
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auto subs = getDefaultSubstituters();
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subs.push_front(store);
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auto b = installable->toDerivedPath();
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// For compat with CLI today, TODO revisit
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auto oneUp = std::visit(overloaded {
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[&](const DerivedPath::Opaque & bo) {
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return make_ref<SingleDerivedPath>(bo);
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},
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[&](const DerivedPath::Built & bfd) {
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return bfd.drvPath;
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},
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}, b.path.raw());
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auto path = resolveDerivedPath(*store, *oneUp);
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RunPager pager;
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for (auto & sub : subs) {
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auto * logSubP = dynamic_cast<LogStore *>(&*sub);
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if (!logSubP) {
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printInfo("Skipped '%s' which does not support retrieving build logs", sub->getUri());
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continue;
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}
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auto & logSub = *logSubP;
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auto log = logSub.getBuildLog(path);
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if (!log) continue;
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stopProgressBar();
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printInfo("got build log for '%s' from '%s'", installable->what(), logSub.getUri());
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writeFull(STDOUT_FILENO, *log);
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return;
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}
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throw Error("build log of '%s' is not available", installable->what());
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}
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};
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static auto rCmdLog = registerCommand<CmdLog>("log");
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