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getEnv(): Return std::optional

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This allows distinguishing between an empty value and no value.
This commit is contained in:
Eelco Dolstra 2019-11-22 16:06:44 +01:00
parent fd900c45b5
commit ba87b08f85
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GPG key ID: 8170B4726D7198DE
17 changed files with 60 additions and 63 deletions
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4
src/libstore/build.cc
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@ -2503,7 +2503,7 @@ void DerivationGoal::initEnv()
already know the cryptographic hash of the output). */
if (fixedOutput) {
for (auto & i : parsedDrv->getStringsAttr("impureEnvVars").value_or(Strings()))
env[i] = getEnv(i);
env[i] = getEnv(i).value_or("");
}
/* Currently structured log messages piggyback on stderr, but we
@ -3075,7 +3075,7 @@ void DerivationGoal::runChild()
/* The tmpDir in scope points at the temporary build directory for our derivation. Some packages try different mechanisms
to find temporary directories, so we want to open up a broader place for them to dump their files, if needed. */
Path globalTmpDir = canonPath(getEnv("TMPDIR", "/tmp"), true);
Path globalTmpDir = canonPath(getEnv("TMPDIR").value_or("/tmp"), true);
/* They don't like trailing slashes on subpath directives */
if (globalTmpDir.back() == '/') globalTmpDir.pop_back();