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Allow substitutes for builds that have preferLocalBuild set

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Not substituting builds with "preferLocalBuild = true" was a bad idea,
because it didn't take the cost of dependencies into account. For
instance, if we can't substitute a fetchgit call, then we have to
download/build git and all its dependencies.

Partially reverts 5558652709 and adds a
new derivation attribute "allowSubstitutes" to specify whether a
derivation may be substituted.
This commit is contained in:
Eelco Dolstra 2015-06-04 16:04:41 +02:00
parent b190f771e7
commit b64988bb35
3 changed files with 18 additions and 10 deletions
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22
src/libstore/build.cc
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@ -999,7 +999,7 @@ void DerivationGoal::haveDerivation()
/* We are first going to try to create the invalid output paths
through substitutes. If that doesn't work, we'll build
them. */
if (settings.useSubstitutes && !willBuildLocally(drv))
if (settings.useSubstitutes && substitutesAllowed(drv))
foreach (PathSet::iterator, i, invalidOutputs)
addWaitee(worker.makeSubstitutionGoal(*i, buildMode == bmRepair));
@ -1196,13 +1196,6 @@ 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)
{
return platform == settings.thisSystem
@ -1213,12 +1206,25 @@ static bool canBuildLocally(const string & platform)
}
static string get(const StringPairs & map, const string & key, const string & def = "")
{
StringPairs::const_iterator i = map.find(key);
return i == map.end() ? def : i->second;
}
bool willBuildLocally(const Derivation & drv)
{
return get(drv.env, "preferLocalBuild") == "1" && canBuildLocally(drv.platform);
}
bool substitutesAllowed(const Derivation & drv)
{
return get(drv.env, "allowSubstitutes", "1") == "1";
}
void DerivationGoal::tryToBuild()
{
trace("trying to build");