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nix repl: add :log

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Add a :log command that shows logs for a derivation.

Closes https://github.com/NixOS/nix/issues/3504

Co-authored-by: Taeer Bar-Yam <taeer@bar-yam.me>
This commit is contained in:
Alexander Bantyev 2021-11-26 18:03:07 +03:00
parent 0a2fa2d684
commit 33926ed1e7
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GPG key ID: E081FF12ADCB4AD5
6 changed files with 54 additions and 4 deletions
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26
src/nix/repl.cc
View file

@ -430,7 +430,8 @@ bool NixRepl::processLine(string line)
<< " :s <expr> Build dependencies of derivation, then start nix-shell\n"
<< " :t <expr> Describe result of evaluation\n"
<< " :u <expr> Build derivation, then start nix-shell\n"
<< " :doc <expr> Show documentation of a builtin function\n";
<< " :doc <expr> Show documentation of a builtin function\n"
<< " :log <expr> Show logs for a derivation\n";
}
else if (command == ":a" || command == ":add") {
@ -500,7 +501,7 @@ bool NixRepl::processLine(string line)
runNix("nix-shell", {state->store->printStorePath(drvPath)});
}
else if (command == ":b" || command == ":i" || command == ":s") {
else if (command == ":b" || command == ":i" || command == ":s" || command == ":log") {
Value v;
evalString(arg, v);
StorePath drvPath = getDerivationPath(v);
@ -514,6 +515,27 @@ bool NixRepl::processLine(string line)
logger->cout(" %s -> %s", outputName, state->store->printStorePath(outputPath));
} else if (command == ":i") {
runNix("nix-env", {"-i", drvPathRaw});
} else if (command == ":log") {
settings.readOnlyMode = true;
Finally roModeReset([&]() {
settings.readOnlyMode = false;
});
auto subs = getDefaultSubstituters();
subs.push_front(state->store);
bool foundLog = false;
RunPager pager;
for (auto & sub : subs) {
auto log = sub->getBuildLog(drvPath);
if (log) {
printInfo("got build log for '%s' from '%s'", drvPathRaw, sub->getUri());
logger->writeToStdout(*log);
foundLog = true;
break;
}
}
if (!foundLog) throw Error("build log of '%s' is not available", drvPathRaw);
} else {
runNix("nix-shell", {drvPathRaw});
}

7
src/nix/repl.md
View file

@ -35,14 +35,17 @@ R""(
nix-repl> emacs.drvPath
"/nix/store/lp0sjrhgg03y2n0l10n70rg0k7hhyz0l-emacs-27.1.drv"
nix-repl> drv = runCommand "hello" { buildInputs = [ hello ]; } "hello > $out"
nix-repl> drv = runCommand "hello" { buildInputs = [ hello ]; } "hello; hello > $out"
nix-repl> :b x
nix-repl> :b drv
this derivation produced the following outputs:
out -> /nix/store/0njwbgwmkwls0w5dv9mpc1pq5fj39q0l-hello
nix-repl> builtins.readFile drv
"Hello, world!\n"
nix-repl> :log drv
Hello, world!
```
# Description