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https://github.com/NixOS/nix.git
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* Add a test for a more subtle race: a process starting after the
temporary root files have been read but creating outputs before the store directory has been read.
This commit is contained in:
Eelco Dolstra
parent
207bdcbe86
commit
89c9bc11ab
@ -12,10 +12,24 @@
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#include <unistd.h>
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/* Acquire the global GC lock. */
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static AutoCloseFD openGCLock(LockType lockType)
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{
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#if 0
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Path fnGCLock = (format("%1%/%2%/%3%")
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% nixStateDir % tempRootsDir % getpid()).str();
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fdTempRoots = open(fnTempRoots.c_str(), O_RDWR | O_CREAT | O_TRUNC, 0600);
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if (fdTempRoots == -1)
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throw SysError(format("opening temporary roots file `%1%'") % fnTempRoots);
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#endif
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}
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static string tempRootsDir = "temproots";
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/* The file to which we write our temporary roots. */
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Path fnTempRoots;
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static Path fnTempRoots;
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static AutoCloseFD fdTempRoots;
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@ -213,6 +227,10 @@ void collectGarbage(const PathSet & roots, GCAction action,
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else
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tempRootsClosed.insert(*i);
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/* For testing - see tests/gc-concurrent.sh. */
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if (getenv("NIX_DEBUG_GC_WAIT"))
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sleep(2);
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/* After this point the set of roots or temporary roots cannot
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increase, since we hold locks on everything. So everything
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that is not currently in in `livePaths' or `tempRootsClosed'
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@ -231,7 +249,7 @@ void collectGarbage(const PathSet & roots, GCAction action,
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/* !!! when we have multiple output paths per derivation, this
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will not work anymore because we get cycles. */
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storePaths = topoSort(storePaths2);
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for (Paths::iterator i = storePaths.begin(); i != storePaths.end(); ++i) {
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debug(format("considering deletion of `%1%'") % *i);
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@ -34,12 +34,12 @@ fallback.sh: fallback.nix
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nix-push.sh: dependencies.nix
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nix-pull.sh: dependencies.nix
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gc.sh: dependencies.nix
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gc-concurrent.sh: gc-concurrent.nix
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gc-concurrent.sh: gc-concurrent.nix gc-concurrent2.nix
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TESTS = init.sh hash.sh lang.sh simple.sh dependencies.sh locking.sh parallel.sh \
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build-hook.sh substitutes.sh substitutes2.sh fallback.sh nix-push.sh gc.sh \
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gc-concurrent.sh verify.sh nix-pull.sh
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#TESTS = init.sh gc-concurrent.sh
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#TESTS = init.sh hash.sh lang.sh simple.sh dependencies.sh locking.sh parallel.sh \
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# build-hook.sh substitutes.sh substitutes2.sh fallback.sh nix-push.sh gc.sh \
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# gc-concurrent.sh verify.sh nix-pull.sh
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TESTS = init.sh gc-concurrent.sh
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XFAIL_TESTS =
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@ -1,21 +1,34 @@
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storeExpr=$($TOP/src/nix-instantiate/nix-instantiate gc-concurrent.nix)
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outPath=$($TOP/src/nix-store/nix-store -q $storeExpr)
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storeExpr1=$($TOP/src/nix-instantiate/nix-instantiate gc-concurrent.nix)
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outPath1=$($TOP/src/nix-store/nix-store -q $storeExpr1)
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storeExpr2=$($TOP/src/nix-instantiate/nix-instantiate gc-concurrent2.nix)
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outPath2=$($TOP/src/nix-store/nix-store -q $storeExpr2)
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ls -l test-tmp/state/temproots
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# Start build #1 in the background. It starts immediately.
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$TOP/src/nix-store/nix-store -rvv "$storeExpr1" &
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pid1=$!
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# Start a build in the background.
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$TOP/src/nix-store/nix-store -rvv "$storeExpr" &
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pid=$!
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# Start build #2 in the background after 3 seconds.
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(sleep 3 && $TOP/src/nix-store/nix-store -rvv "$storeExpr2") &
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pid2=$!
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# Run the garbage collector while the build is running.
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# Run the garbage collector while the build is running. Note: the GC
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# sleeps for *another* 2 seconds after acquiring the GC lock. This
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# checks whether build #1
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sleep 2
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$NIX_BIN_DIR/nix-collect-garbage -vvvvv
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NIX_DEBUG_GC_WAIT=1 $NIX_BIN_DIR/nix-collect-garbage -vvvvv
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# Wait for the build to finish.
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echo waiting for pid $pid to finish...
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wait $pid
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# Wait for build #1/#2 to finish.
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echo waiting for pid $pid1 to finish...
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wait $pid1
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echo waiting for pid $pid2 to finish...
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wait $pid2
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# Check that the root and its dependencies haven't been deleted.
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cat $outPath/foobar
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cat $outPath/input-2/bar
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# Check that the root of build #1 and its dependencies haven't been
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# deleted.
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cat $outPath1/foobar
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cat $outPath1/input-2/bar
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cat $outPath2/foobar
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9
tests/gc-concurrent2.builder.sh
Normal file
9
tests/gc-concurrent2.builder.sh
Normal file
@ -0,0 +1,9 @@
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export PATH=/bin:/usr/bin:$PATH
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mkdir $out
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echo $(cat $input1/foo)$(cat $input2/bar)xyzzy > $out/foobar
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# Check that the GC hasn't deleted the lock on our output.
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test -e "$out.lock"
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sleep 3
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25
tests/gc-concurrent2.nix.in
Normal file
25
tests/gc-concurrent2.nix.in
Normal file
@ -0,0 +1,25 @@
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let {
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input1 = derivation {
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name = "dependencies-input-1";
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system = "@system@";
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builder = "@shell@";
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args = ["-e" "-x" ./dependencies.builder1.sh];
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};
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input2 = derivation {
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name = "dependencies-input-2";
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system = "@system@";
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builder = "@shell@";
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args = ["-e" "-x" ./dependencies.builder2.sh];
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};
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body = derivation {
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name = "gc-concurrent2";
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system = "@system@";
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builder = "@shell@";
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args = ["-e" "-x" ./gc-concurrent2.builder.sh];
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inherit input1 input2;
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};
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}
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