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Don't set $preferLocalBuild and $requiredSystemFeatures in builders

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With C++ std::map, doing a comparison like ‘map["foo"] == ...’ has the
side-effect of adding a mapping from "foo" to the empty string if
"foo" doesn't exist in the map.  So we ended up setting some
environment variables by accident.
This commit is contained in:
Eelco Dolstra 2013-06-20 20:05:03 +02:00
parent 5558652709
commit 7ccd946407
2 changed files with 15 additions and 8 deletions
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21
src/libstore/build.cc
View file

@ -1263,6 +1263,13 @@ PathSet outputPaths(const DerivationOutputs & outputs)
} }
static string get(const StringPairs & map, const string & key)
{
StringPairs::const_iterator i = map.find(key);
return i == map.end() ? (string) "" : i->second;
}
static bool canBuildLocally(const string & platform) static bool canBuildLocally(const string & platform)
{ {
return platform == settings.thisSystem return platform == settings.thisSystem
@ -1273,9 +1280,9 @@ static bool canBuildLocally(const string & platform)
} }
bool willBuildLocally(Derivation & drv) bool willBuildLocally(const Derivation & drv)
{ {
return drv.env["preferLocalBuild"] == "1" && canBuildLocally(drv.platform); return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
} }
@ -1610,7 +1617,7 @@ HookReply DerivationGoal::tryBuildHook()
/* Tell the hook about system features (beyond the system type) /* Tell the hook about system features (beyond the system type)
required from the build machine. (The hook could parse the required from the build machine. (The hook could parse the
drv file itself, but this is easier.) */ drv file itself, but this is easier.) */
Strings features = tokenizeString<Strings>(drv.env["requiredSystemFeatures"]); Strings features = tokenizeString<Strings>(get(drv.env, "requiredSystemFeatures"));
foreach (Strings::iterator, i, features) checkStoreName(*i); /* !!! abuse */ foreach (Strings::iterator, i, features) checkStoreName(*i); /* !!! abuse */
/* Send the request to the hook. */ /* Send the request to the hook. */
@ -1768,7 +1775,7 @@ void DerivationGoal::startBuilder()
fixed-output derivations is by definition pure (since we fixed-output derivations is by definition pure (since we
already know the cryptographic hash of the output). */ already know the cryptographic hash of the output). */
if (fixedOutput) { if (fixedOutput) {
Strings varNames = tokenizeString<Strings>(drv.env["impureEnvVars"]); Strings varNames = tokenizeString<Strings>(get(drv.env, "impureEnvVars"));
foreach (Strings::iterator, i, varNames) env[*i] = getEnv(*i); foreach (Strings::iterator, i, varNames) env[*i] = getEnv(*i);
} }
@ -1779,7 +1786,7 @@ void DerivationGoal::startBuilder()
temporary build directory. The text files have the format used temporary build directory. The text files have the format used
by `nix-store --register-validity'. However, the deriver by `nix-store --register-validity'. However, the deriver
fields are left empty. */ fields are left empty. */
string s = drv.env["exportReferencesGraph"]; string s = get(drv.env, "exportReferencesGraph");
Strings ss = tokenizeString<Strings>(s); Strings ss = tokenizeString<Strings>(s);
if (ss.size() % 2 != 0) if (ss.size() % 2 != 0)
throw BuildError(format("odd number of tokens in `exportReferencesGraph': `%1%'") % s); throw BuildError(format("odd number of tokens in `exportReferencesGraph': `%1%'") % s);
@ -1865,7 +1872,7 @@ void DerivationGoal::startBuilder()
if (fixedOutput) useChroot = false; if (fixedOutput) useChroot = false;
/* Hack to allow derivations to disable chroot builds. */ /* Hack to allow derivations to disable chroot builds. */
if (drv.env["__noChroot"] == "1") useChroot = false; if (get(drv.env, "__noChroot") == "1") useChroot = false;
if (useChroot) { if (useChroot) {
#if CHROOT_ENABLED #if CHROOT_ENABLED
@ -2344,7 +2351,7 @@ void DerivationGoal::computeClosure()
refer to), check that all references are in that list. !!! refer to), check that all references are in that list. !!!
allowedReferences should really be per-output. */ allowedReferences should really be per-output. */
if (drv.env.find("allowedReferences") != drv.env.end()) { if (drv.env.find("allowedReferences") != drv.env.end()) {
PathSet allowed = parseReferenceSpecifiers(drv, drv.env["allowedReferences"]); PathSet allowed = parseReferenceSpecifiers(drv, get(drv.env, "allowedReferences"));
foreach (PathSet::iterator, i, references) foreach (PathSet::iterator, i, references)
if (allowed.find(*i) == allowed.end()) if (allowed.find(*i) == allowed.end())
throw BuildError(format("output is not allowed to refer to path `%1%'") % *i); throw BuildError(format("output is not allowed to refer to path `%1%'") % *i);

2
src/libstore/misc.hh
View file

@ -32,7 +32,7 @@ void queryMissing(StoreAPI & store, const PathSet & targets,
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown, PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
unsigned long long & downloadSize, unsigned long long & narSize); unsigned long long & downloadSize, unsigned long long & narSize);
bool willBuildLocally(Derivation & drv); bool willBuildLocally(const Derivation & drv);
} }