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build: add exit code for hash and check mismatches 

Makes it easier to identify the failure reason in other tooling, eg.
differentiate between a non-deterministic --check vs a failed build.

	$ nix-build '<nix/fetchurl.nix>' --argstr url http://example.org --argstr sha256 0000000000000000000000000000000000000000000000000000
	hash mismatch in fixed-output derivation '/nix/store/nzi9ck45rwlxzcwr25is7qlf3hs5xl83-example.org':
	  wanted: sha256:0000000000000000000000000000000000000000000000000000
	  got:    sha256:08y4734bm2zahw75b16bcmcg587vvyvh0n11gwiyir70divwp1rm
	$ echo $?
	102

	$ nix-build -E 'with import <nixpkgs> {}; runCommand "foo" {} "date +%s > $out"' --check
	warning: rewriting hashes in '/nix/store/g3k47g0399fvjmbm0p0mnad74k4w8vkz-foo'; cross fingers
	error: derivation '/nix/store/mggc8dz13ackb49qca6m23zq4fpq132q-foo.drv' may not be deterministic: output '/nix/store/g3k47g0399fvjmbm0p0mnad74k4w8vkz-foo' differs
	$ echo $?
	104
This commit is contained in:
Daiderd Jordan 2019-07-02 00:12:12 +02:00
parent 5c8f477283
commit 97baf32fbc
No known key found for this signature in database
GPG Key ID: D02435D05B810C96
2 changed files with 15 additions and 4 deletions
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16
src/libstore/build.cc
View File

@ -266,6 +266,12 @@ public:
/* Set if at least one derivation had a timeout. */
bool timedOut;
/* Set if at least one derivation fails with a hash mismatch. */
bool hashMismatch;
/* Set if at least one derivation is not deterministic in check mode. */
bool checkMismatch;
LocalStore & store;
std::unique_ptr<HookInstance> hook;
@ -3213,6 +3219,7 @@ void DerivationGoal::registerOutputs()
/* Throw an error after registering the path as
valid. */
worker.hashMismatch = true;
delayedException = std::make_exception_ptr(
BuildError("hash mismatch in fixed-output derivation '%s':\n wanted: %s\n got: %s",
dest, h.to_string(), h2.to_string()));
@ -3255,6 +3262,7 @@ void DerivationGoal::registerOutputs()
if (!worker.store.isValidPath(path)) continue;
auto info = *worker.store.queryPathInfo(path);
if (hash.first != info.narHash) {
worker.checkMismatch = true;
if (settings.runDiffHook || settings.keepFailed) {
Path dst = worker.store.toRealPath(path + checkSuffix);
deletePath(dst);
@ -3266,10 +3274,10 @@ void DerivationGoal::registerOutputs()
buildUser ? buildUser->getGID() : getgid(),
path, dst, drvPath, tmpDir);
throw Error(format("derivation '%1%' may not be deterministic: output '%2%' differs from '%3%'")
throw NotDeterministic(format("derivation '%1%' may not be deterministic: output '%2%' differs from '%3%'")
% drvPath % path % dst);
} else
throw Error(format("derivation '%1%' may not be deterministic: output '%2%' differs")
throw NotDeterministic(format("derivation '%1%' may not be deterministic: output '%2%' differs")
% drvPath % path);
}
@ -4101,6 +4109,8 @@ Worker::Worker(LocalStore & store)
lastWokenUp = steady_time_point::min();
permanentFailure = false;
timedOut = false;
hashMismatch = false;
checkMismatch = false;
}
@ -4461,7 +4471,7 @@ void Worker::waitForInput()
unsigned int Worker::exitStatus()
{
return timedOut ? 101 : (permanentFailure ? 100 : 1);
return checkMismatch ? 104 : (hashMismatch ? 102 : (timedOut ? 101 : (permanentFailure ? 100 : 1)));
}

3
src/libstore/download.cc
View File

@ -855,10 +855,11 @@ CachedDownloadResult Downloader::downloadCached(
}
if (expectedStorePath != "" && storePath != expectedStorePath) {
unsigned int statusCode = 102;
Hash gotHash = request.unpack
? hashPath(request.expectedHash.type, store->toRealPath(storePath)).first
: hashFile(request.expectedHash.type, store->toRealPath(storePath));
throw nix::Error("hash mismatch in file downloaded from '%s':\n wanted: %s\n got: %s",
throw nix::Error(statusCode, "hash mismatch in file downloaded from '%s':\n wanted: %s\n got: %s",
url, request.expectedHash.to_string(), gotHash.to_string());
}