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* Acquire the locks on the output paths before trying to run the build

Browse source 
hook.  This fixes a problem with log files being partially or
  completely filled with 0's because another nix-store process
  truncates the log file.  It should also be more efficient.
This commit is contained in:
Eelco Dolstra 2009-03-18 14:48:42 +00:00
parent 1dcf208f56
commit c183ee5c79
4 changed files with 78 additions and 150 deletions
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208
src/libstore/build.cc
View file

@ -108,7 +108,6 @@ protected:
{
nrFailed = 0;
exitCode = ecBusy;
forceInputs = false;
}
virtual ~Goal()
@ -116,8 +115,6 @@ protected:
trace("goal destroyed");
}
bool forceInputs;
public:
virtual void work() = 0;
@ -152,11 +149,6 @@ public:
(important!), etc. */
virtual void cancel() = 0;
void setForceInputs(bool x)
{
forceInputs = x;
}
protected:
void amDone(ExitCode result);
};
@ -264,7 +256,7 @@ public:
MakeError(SubstError, Error)
MakeError(BuildError, Error)
MakeError(BuildError, Error) /* denoted a permanent build failure */
//////////////////////////////////////////////////////////////////////
@ -496,7 +488,7 @@ void UserLock::acquire()
}
}
throw BuildError(format("all build users are currently in use; "
throw Error(format("all build users are currently in use; "
"consider creating additional users and adding them to the `%1%' group")
% buildUsersGroup);
}
@ -689,7 +681,7 @@ private:
void buildDone();
/* Is the build hook willing to perform the build? */
typedef enum {rpAccept, rpDecline, rpPostpone, rpDone, rpRestart} HookReply;
typedef enum {rpAccept, rpDecline, rpPostpone} HookReply;
HookReply tryBuildHook();
/* Synchronously wait for a build hook to finish. */
@ -838,11 +830,9 @@ void DerivationGoal::haveDerivation()
/* If they are all valid, then we're done. */
if (invalidOutputs.size() == 0) {
if(!forceInputs) {
amDone(ecSuccess);
return;
}
}
/* If this is a fixed-output derivation, it is possible that some
other goal is already building the output paths. (The case
@ -883,55 +873,21 @@ void DerivationGoal::outputsSubstituted()
nrFailed = 0;
if (checkPathValidity(false).size() == 0) {
if (! forceInputs){
amDone(ecSuccess);
return;
}
}
/* Otherwise, at least one of the output paths could not be
produced using a substitute. So we have to build instead. */
/* The inputs must be built before we can build this goal. */
/* !!! but if possible, only install the paths that we need */
for (DerivationInputs::iterator i = drv.inputDrvs.begin();
i != drv.inputDrvs.end(); ++i){
GoalPtr newGoal = worker.makeDerivationGoal(i->first);
newGoal->setForceInputs(forceInputs);
addWaitee(newGoal);
}
foreach (DerivationInputs::iterator, i, drv.inputDrvs)
addWaitee(worker.makeDerivationGoal(i->first));
for (PathSet::iterator i = drv.inputSrcs.begin();
i != drv.inputSrcs.end(); ++i)
addWaitee(worker.makeSubstitutionGoal(*i));
/* Actually, I do some work twice just to be on the safe side */
string s = drv.env["exportBuildReferencesGraph"];
Strings ss = tokenizeString(s);
if (ss.size() % 2 !=0)
throw BuildError(format("odd number of tokens in `exportBuildReferencesGraph': `%1%'") % s);
for (Strings::iterator i = ss.begin(); i != ss.end(); ) {
string fileName = *i++;
Path storePath=*i++;
if (!isInStore(storePath))
throw BuildError(format("`exportBuildReferencesGraph' contains a non-store path `%1%'")
% storePath);
storePath = toStorePath(storePath);
if (!worker.store.isValidPath(storePath))
throw BuildError(format("`exportBuildReferencesGraph' contains an invalid path `%1%'")
% storePath);
/* Build-time closure should be in dependencies
* We really want just derivation, its closure
* and outputs. Looks like we should build it.
* */
GoalPtr newGoal = worker.makeDerivationGoal(storePath);
newGoal->setForceInputs(true);
addWaitee(newGoal);
}
state = &DerivationGoal::inputsRealised;
}
@ -943,18 +899,49 @@ void DerivationGoal::inputsRealised()
if (nrFailed != 0) {
printMsg(lvlError,
format("cannot build derivation `%1%': "
"%2% inputs could not be realised")
"%2% dependencies couldn't be built")
% drvPath % nrFailed);
amDone(ecFailed);
return;
}
/* Maybe we just wanted to force build of inputs */
if (checkPathValidity(false).size() == 0) {
amDone(ecSuccess);
return;
/* Gather information necessary for computing the closure and/or
running the build hook. */
/* The outputs are referenceable paths. */
foreach (DerivationOutputs::iterator, i, drv.outputs) {
debug(format("building path `%1%'") % i->second.path);
allPaths.insert(i->second.path);
}
/* Determine the full set of input paths. */
/* First, the input derivations. */
foreach (DerivationInputs::iterator, i, drv.inputDrvs) {
/* Add the relevant output closures of the input derivation
`*i' as input paths. Only add the closures of output paths
that are specified as inputs. */
assert(worker.store.isValidPath(i->first));
Derivation inDrv = derivationFromPath(i->first);
foreach (StringSet::iterator, j, i->second)
if (inDrv.outputs.find(*j) != inDrv.outputs.end())
computeFSClosure(inDrv.outputs[*j].path, inputPaths);
else
throw Error(
format("derivation `%1%' requires non-existent output `%2%' from input derivation `%3%'")
% drvPath % *j % i->first);
}
/* Second, the input sources. */
foreach (PathSet::iterator, i, drv.inputSrcs)
computeFSClosure(*i, inputPaths);
/* !!! if `*i' is a derivation, then add the closure of every
output in the dependency graph to `inputPaths'. */
debug(format("added input paths %1%") % showPaths(inputPaths));
allPaths.insert(inputPaths.begin(), inputPaths.end());
/* Okay, try to build. Note that here we don't wait for a build
slot to become available, since we don't need one if there is a
build hook. */
@ -967,6 +954,20 @@ void DerivationGoal::tryToBuild()
{
trace("trying to build");
/* Acquire locks on the output paths. After acquiring the locks,
it might turn out that somebody else has performed the build
already, and we're done. If not, we can proceed. */
switch (prepareBuild()) {
case prDone:
amDone(ecSuccess);
return;
case prRestart:
worker.waitForAnyGoal(shared_from_this());
return;
case prProceed:
break;
}
try {
/* Is the build hook willing to accept this job? */
@ -980,38 +981,19 @@ void DerivationGoal::tryToBuild()
case rpPostpone:
/* Not now; wait until at least one child finishes. */
worker.waitForChildTermination(shared_from_this());
outputLocks.unlock();
return;
case rpDecline:
/* We should do it ourselves. */
break;
case rpDone:
/* Somebody else did it. */
amDone(ecSuccess);
return;
case rpRestart:
/* Somebody else is building this output path.
Restart from haveDerivation(). */
state = &DerivationGoal::haveDerivation;
worker.waitForAnyGoal(shared_from_this());
return;
}
usingBuildHook = false;
/* Make sure that we are allowed to start a build. */
if (!worker.canBuildMore()) {
worker.waitForBuildSlot(shared_from_this());
return;
}
/* Acquire locks and such. If we then see that the build has
been done by somebody else, we're done. */
usingBuildHook = false;
PrepareBuildReply preply = prepareBuild();
if (preply == prDone) {
amDone(ecSuccess);
return;
} else if (preply == prRestart) {
state = &DerivationGoal::haveDerivation;
worker.waitForAnyGoal(shared_from_this());
outputLocks.unlock();
return;
}
@ -1022,14 +1004,13 @@ void DerivationGoal::tryToBuild()
printMsg(lvlError, e.msg());
outputLocks.unlock();
buildUser.release();
if (printBuildTrace) {
if (printBuildTrace)
if (usingBuildHook)
printMsg(lvlError, format("@ hook-failed %1% %2% %3% %4%")
% drvPath % drv.outputs["out"].path % 0 % e.msg());
else
printMsg(lvlError, format("@ build-failed %1% %2% %3% %4%")
% drvPath % drv.outputs["out"].path % 0 % e.msg());
}
amDone(ecFailed);
return;
}
@ -1069,8 +1050,7 @@ void DerivationGoal::buildDone()
malicious user from leaving behind a process that keeps files
open and modifies them after they have been chown'ed to
root. */
if (buildUser.enabled())
buildUser.kill();
if (buildUser.enabled()) buildUser.kill();
try {
@ -1140,7 +1120,7 @@ void DerivationGoal::buildDone()
% drvPath % drv.outputs["out"].path % status % e.msg());
else
printMsg(lvlError, format("@ build-failed %1% %2% %3% %4%")
% drvPath % drv.outputs["out"].path % status % e.msg());
% drvPath % drv.outputs["out"].path % 1 % e.msg());
}
amDone(ecFailed);
return;
@ -1296,16 +1276,6 @@ DerivationGoal::HookReply DerivationGoal::tryBuildHook()
else if (reply == "accept") {
/* Acquire locks and such. If we then see that the output
paths are now valid, we're done. */
PrepareBuildReply preply = prepareBuild();
if (preply == prDone || preply == prRestart) {
/* Tell the hook to exit. */
writeLine(toHook.writeSide, "cancel");
terminateBuildHook();
return preply == prDone ? rpDone : rpRestart;
}
printMsg(lvlInfo, format("running hook to build path(s) %1%")
% showPaths(outputPaths(drv.outputs)));
@ -1390,8 +1360,7 @@ DerivationGoal::PrepareBuildReply DerivationGoal::prepareBuild()
has locked the output since we checked in haveDerivation().
(It can't happen between here and the lockPaths() call below
because we're not allowing multi-threading.) */
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
foreach (DerivationOutputs::iterator, i, drv.outputs)
if (pathIsLockedByMe(i->second.path)) {
debug(format("restarting derivation `%1%' because `%2%' is locked by another goal")
% drvPath % i->second.path);
@ -1425,66 +1394,23 @@ DerivationGoal::PrepareBuildReply DerivationGoal::prepareBuild()
if (validPaths.size() > 0) {
/* !!! fix this; try to delete valid paths */
throw BuildError(
throw Error(
format("derivation `%1%' is blocked by its output paths")
% drvPath);
}
/* If any of the outputs already exist but are not registered,
delete them. */
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
{
foreach (DerivationOutputs::iterator, i, drv.outputs) {
Path path = i->second.path;
if (worker.store.isValidPath(path))
throw BuildError(format("obstructed build: path `%1%' exists") % path);
throw Error(format("obstructed build: path `%1%' exists") % path);
if (pathExists(path)) {
debug(format("removing unregistered path `%1%'") % path);
deletePathWrapped(path);
}
}
/* Gather information necessary for computing the closure and/or
running the build hook. */
/* The outputs are referenceable paths. */
for (DerivationOutputs::iterator i = drv.outputs.begin();
i != drv.outputs.end(); ++i)
{
debug(format("building path `%1%'") % i->second.path);
allPaths.insert(i->second.path);
}
/* Determine the full set of input paths. */
/* First, the input derivations. */
for (DerivationInputs::iterator i = drv.inputDrvs.begin();
i != drv.inputDrvs.end(); ++i)
{
/* Add the relevant output closures of the input derivation
`*i' as input paths. Only add the closures of output paths
that are specified as inputs. */
assert(worker.store.isValidPath(i->first));
Derivation inDrv = derivationFromPath(i->first);
for (StringSet::iterator j = i->second.begin();
j != i->second.end(); ++j)
if (inDrv.outputs.find(*j) != inDrv.outputs.end())
computeFSClosure(inDrv.outputs[*j].path, inputPaths);
else
throw BuildError(
format("derivation `%1%' requires non-existent output `%2%' from input derivation `%3%'")
% drvPath % *j % i->first);
}
/* Second, the input sources. */
for (PathSet::iterator i = drv.inputSrcs.begin();
i != drv.inputSrcs.end(); ++i)
computeFSClosure(*i, inputPaths);
debug(format("added input paths %1%") % showPaths(inputPaths));
allPaths.insert(inputPaths.begin(), inputPaths.end());
return prProceed;
}
@ -1508,7 +1434,7 @@ void DerivationGoal::startBuilder()
&& !(drv.platform == "i686-linux" && thisSystem == "x86_64-linux")
#endif
)
throw BuildError(
throw Error(
format("a `%1%' is required to build `%3%', but I am a `%2%'")
% drv.platform % thisSystem % drvPath);

4
tests/dependencies.sh
View file

@ -1,5 +1,7 @@
source common.sh
clearStore
drvPath=$($nixinstantiate dependencies.nix)
echo "derivation is $drvPath"
@ -13,7 +15,7 @@ if test -n "$dot"; then
$dot < $TEST_ROOT/graph
fi
outPath=$($nixstore -rvv "$drvPath")
outPath=$($nixstore -rvv "$drvPath") || fail "build failed"
# Test Graphviz graph generation.
$nixstore -q --graph "$outPath" > $TEST_ROOT/graph

6
tests/gc-concurrent.sh
View file

@ -1,6 +1,6 @@
source common.sh
$NIX_BIN_DIR/nix-collect-garbage -vvvvv
$NIX_BIN_DIR/nix-collect-garbage
drvPath1=$($nixinstantiate gc-concurrent.nix -A test1)
outPath1=$($nixstore -q $drvPath1)
@ -28,7 +28,7 @@ pid2=$!
# Run the garbage collector while the build is running.
sleep 4
$NIX_BIN_DIR/nix-collect-garbage -vvvvv
$NIX_BIN_DIR/nix-collect-garbage
# Wait for build #1/#2 to finish.
echo waiting for pid $pid1 to finish...
@ -53,6 +53,6 @@ rm -f "$NIX_STATE_DIR"/gcroots/foo*
! test -e $outPath3.lock
# If we run the collector now, it should delete outPath1/2.
$NIX_BIN_DIR/nix-collect-garbage -vvvvv
$NIX_BIN_DIR/nix-collect-garbage
! test -e $outPath1
! test -e $outPath2

2
tests/parallel.sh
View file

@ -2,7 +2,7 @@ source common.sh
clearStore
outPath=$($nixbuild -vv -j10000 parallel.nix)
outPath=$($nixbuild -j10000 parallel.nix)
echo "output path is $outPath"