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Add a test for auto-GC

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This currently fails because we're using POSIX file locks. So when the
garbage collector opens and closes its own temproots file, it causes
the lock to be released and then deleted by another GC instance.
This commit is contained in:
Eelco Dolstra 2019-08-02 17:07:33 +02:00
parent 320126aeeb
commit ec415d7166
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GPG key ID: 8170B4726D7198DE
4 changed files with 72 additions and 3 deletions
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9
src/libstore/gc.cc
View file

@ -871,7 +871,12 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
void LocalStore::autoGC(bool sync)
{
auto getAvail = [this]() {
static auto fakeFreeSpaceFile = getEnv("_NIX_TEST_FREE_SPACE_FILE", "");
auto getAvail = [this]() -> uint64_t {
if (!fakeFreeSpaceFile.empty())
return std::stoll(readFile(fakeFreeSpaceFile));
struct statvfs st;
if (statvfs(realStoreDir.c_str(), &st))
throw SysError("getting filesystem info about '%s'", realStoreDir);
@ -892,7 +897,7 @@ void LocalStore::autoGC(bool sync)
auto now = std::chrono::steady_clock::now();
if (now < state->lastGCCheck + std::chrono::seconds(5)) return;
if (now < state->lastGCCheck + std::chrono::seconds(settings.minFreeCheckInterval)) return;
auto avail = getAvail();

3
src/libstore/globals.hh
View file

@ -342,6 +342,9 @@ public:
Setting<uint64_t> maxFree{this, std::numeric_limits<uint64_t>::max(), "max-free",
"Stop deleting garbage when free disk space is above the specified amount."};
Setting<uint64_t> minFreeCheckInterval{this, 5, "min-free-check-interval",
"Number of seconds between checking free disk space."};
Setting<Paths> pluginFiles{this, {}, "plugin-files",
"Plugins to dynamically load at nix initialization time."};
};

59
tests/gc-auto.sh Normal file
View file

@ -0,0 +1,59 @@
source common.sh
clearStore
garbage1=$(nix add-to-store --name garbage1 ./tarball.sh)
garbage2=$(nix add-to-store --name garbage2 ./tarball.sh)
garbage3=$(nix add-to-store --name garbage3 ./tarball.sh)
fake_free=$TEST_ROOT/fake-free
export _NIX_TEST_FREE_SPACE_FILE=$fake_free
echo 1100 > $fake_free
expr=$(cat <<EOF
with import ./config.nix; mkDerivation {
name = "gc-A";
buildCommand = ''
[[ \$(ls \$NIX_STORE/*-garbage? | wc -l) = 3 ]]
mkdir \$out
echo foo > \$out/bar
echo 1...
sleep 2
echo 100 > $fake_free
echo 2...
sleep 2
echo 3...
[[ \$(ls \$NIX_STORE/*-garbage? | wc -l) = 1 ]]
'';
}
EOF
)
nix build -o $TEST_ROOT/result-A -L "($expr)" \
--min-free 1000 --max-free 2000 --min-free-check-interval 1 &
pid=$!
expr2=$(cat <<EOF
with import ./config.nix; mkDerivation {
name = "gc-B";
buildCommand = ''
mkdir \$out
echo foo > \$out/bar
echo 1...
sleep 2
echo 100 > $fake_free
echo 2...
sleep 2
echo 3...
'';
}
EOF
)
nix build -o $TEST_ROOT/result-B -L "($expr2)" \
--min-free 1000 --max-free 2000 --min-free-check-interval 1
wait "$pid"
[[ foo = $(cat $TEST_ROOT/result-A/bar) ]]
[[ foo = $(cat $TEST_ROOT/result-B/bar) ]]

4
tests/local.mk
View file

@ -3,7 +3,9 @@ check:
nix_tests = \
init.sh hash.sh lang.sh add.sh simple.sh dependencies.sh \
gc.sh gc-concurrent.sh \
gc.sh \
gc-concurrent.sh \
gc-auto.sh \
referrers.sh user-envs.sh logging.sh nix-build.sh misc.sh fixed.sh \
gc-runtime.sh check-refs.sh filter-source.sh \
remote-store.sh export.sh export-graph.sh \