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refactor(tvix): getEnv(): Return std::optional

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This allows distinguishing between an empty value and no value.

Patch ported from upstream at
ba87b08f85

Change-Id: I061cc8e16b1a7a0341adfc3b0edca1c0c51d5c97
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1884
Tested-by: BuildkiteCI
Reviewed-by: kanepyork <rikingcoding@gmail.com>
This commit is contained in:
Eelco Dolstra 2019-11-22 16:06:44 +01:00 • committed by glittershark
parent c5f3b12f04
commit 785cb3a754
17 changed files with 66 additions and 66 deletions
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3
third_party/nix/src/libstore/gc.cc vendored
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@ -906,7 +906,8 @@ void LocalStore::collectGarbage(const GCOptions& options, GCResults& results) {
}
void LocalStore::autoGC(bool sync) {
static auto fakeFreeSpaceFile = getEnv("_NIX_TEST_FREE_SPACE_FILE", "");
static auto fakeFreeSpaceFile =
getEnv("_NIX_TEST_FREE_SPACE_FILE").value_or("");
auto getAvail = [this]() -> uint64_t {
if (!fakeFreeSpaceFile.empty()) {