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-rw-r--r--nix/libstore/local-store.cc159
1 files changed, 37 insertions, 122 deletions
diff --git a/nix/libstore/local-store.cc b/nix/libstore/local-store.cc
index 8c479002ec..4219573a56 100644
--- a/nix/libstore/local-store.cc
+++ b/nix/libstore/local-store.cc
@@ -57,7 +57,6 @@ void checkStoreNotSymlink()
LocalStore::LocalStore(bool reserveSpace)
- : didSetSubstituterEnv(false)
{
schemaPath = settings.nixDBPath + "/schema";
@@ -183,21 +182,6 @@ LocalStore::LocalStore(bool reserveSpace)
LocalStore::~LocalStore()
{
try {
- if (runningSubstituter) {
- RunningSubstituter &i = *runningSubstituter;
- if (!i.disabled) {
- i.to.close();
- i.from.close();
- i.error.close();
- if (i.pid != -1)
- i.pid.wait(true);
- }
- }
- } catch (...) {
- ignoreException();
- }
-
- try {
if (fdTempRoots != -1) {
fdTempRoots.close();
unlink(fnTempRoots.c_str());
@@ -796,96 +780,31 @@ Path LocalStore::queryPathFromHashPart(const string & hashPart)
});
}
-
-void LocalStore::setSubstituterEnv()
-{
- if (didSetSubstituterEnv) return;
-
- /* Pass configuration options (including those overridden with
- --option) to substituters. */
- setenv("_NIX_OPTIONS", settings.pack().c_str(), 1);
-
- didSetSubstituterEnv = true;
-}
-
-
-void LocalStore::startSubstituter(RunningSubstituter & run)
-{
- if (run.disabled || run.pid != -1) return;
-
- debug(format("starting substituter program `%1% substitute'")
- % settings.guixProgram);
-
- Pipe toPipe, fromPipe, errorPipe;
-
- toPipe.create();
- fromPipe.create();
- errorPipe.create();
-
- setSubstituterEnv();
-
- run.pid = startProcess([&]() {
- if (dup2(toPipe.readSide, STDIN_FILENO) == -1)
- throw SysError("dupping stdin");
- if (dup2(fromPipe.writeSide, STDOUT_FILENO) == -1)
- throw SysError("dupping stdout");
- if (dup2(errorPipe.writeSide, STDERR_FILENO) == -1)
- throw SysError("dupping stderr");
- execl(settings.guixProgram.c_str(), "guix", "substitute", "--query", NULL);
- throw SysError(format("executing `%1%'") % settings.guixProgram);
- });
-
- run.to = toPipe.writeSide.borrow();
- run.from = run.fromBuf.fd = fromPipe.readSide.borrow();
- run.error = errorPipe.readSide.borrow();
-
- toPipe.readSide.close();
- fromPipe.writeSide.close();
- errorPipe.writeSide.close();
-
- /* The substituter may exit right away if it's disabled in any way
- (e.g. copy-from-other-stores.pl will exit if no other stores
- are configured). */
- try {
- getLineFromSubstituter(run);
- } catch (EndOfFile & e) {
- run.to.close();
- run.from.close();
- run.error.close();
- run.disabled = true;
- if (run.pid.wait(true) != 0) throw;
- }
-}
-
-
/* Read a line from the substituter's stdout, while also processing
its stderr. */
-string LocalStore::getLineFromSubstituter(RunningSubstituter & run)
+string LocalStore::getLineFromSubstituter(Agent & run)
{
string res, err;
- /* We might have stdout data left over from the last time. */
- if (run.fromBuf.hasData()) goto haveData;
-
while (1) {
checkInterrupt();
fd_set fds;
FD_ZERO(&fds);
- FD_SET(run.from, &fds);
- FD_SET(run.error, &fds);
+ FD_SET(run.fromAgent.readSide, &fds);
+ FD_SET(run.builderOut.readSide, &fds);
/* Wait for data to appear on the substituter's stdout or
stderr. */
- if (select(run.from > run.error ? run.from + 1 : run.error + 1, &fds, 0, 0, 0) == -1) {
+ if (select(std::max(run.fromAgent.readSide, run.builderOut.readSide) + 1, &fds, 0, 0, 0) == -1) {
if (errno == EINTR) continue;
throw SysError("waiting for input from the substituter");
}
/* Completely drain stderr before dealing with stdout. */
- if (FD_ISSET(run.error, &fds)) {
+ if (FD_ISSET(run.builderOut.readSide, &fds)) {
char buf[4096];
- ssize_t n = read(run.error, (unsigned char *) buf, sizeof(buf));
+ ssize_t n = read(run.builderOut.readSide, (unsigned char *) buf, sizeof(buf));
if (n == -1) {
if (errno == EINTR) continue;
throw SysError("reading from substituter's stderr");
@@ -903,23 +822,20 @@ string LocalStore::getLineFromSubstituter(RunningSubstituter & run)
}
/* Read from stdout until we get a newline or the buffer is empty. */
- else if (run.fromBuf.hasData() || FD_ISSET(run.from, &fds)) {
- haveData:
- do {
- unsigned char c;
- run.fromBuf(&c, 1);
- if (c == '\n') {
- if (!err.empty()) printMsg(lvlError, "substitute: " + err);
- return res;
- }
- res += c;
- } while (run.fromBuf.hasData());
+ else if (FD_ISSET(run.fromAgent.readSide, &fds)) {
+ unsigned char c;
+ readFull(run.fromAgent.readSide, (unsigned char *) &c, 1);
+ if (c == '\n') {
+ if (!err.empty()) printMsg(lvlError, "substitute: " + err);
+ return res;
+ }
+ res += c;
}
}
}
-template<class T> T LocalStore::getIntLineFromSubstituter(RunningSubstituter & run)
+template<class T> T LocalStore::getIntLineFromSubstituter(Agent & run)
{
string s = getLineFromSubstituter(run);
T res;
@@ -935,27 +851,26 @@ PathSet LocalStore::querySubstitutablePaths(const PathSet & paths)
if (!settings.useSubstitutes || paths.empty()) return res;
if (!runningSubstituter) {
- std::unique_ptr<RunningSubstituter>fresh(new RunningSubstituter);
+ const Strings args = { "substitute", "--query" };
+ const std::map<string, string> env = { { "_NIX_OPTIONS", settings.pack() } };
+ std::unique_ptr<Agent> fresh(new Agent(settings.guixProgram, args, env));
runningSubstituter.swap(fresh);
}
- RunningSubstituter & run = *runningSubstituter;
- startSubstituter(run);
-
- if (!run.disabled) {
- string s = "have ";
- foreach (PathSet::const_iterator, j, paths)
- if (res.find(*j) == res.end()) { s += *j; s += " "; }
- writeLine(run.to, s);
- while (true) {
- /* FIXME: we only read stderr when an error occurs, so
- substituters should only write (short) messages to
- stderr when they fail. I.e. they shouldn't write debug
- output. */
- Path path = getLineFromSubstituter(run);
- if (path == "") break;
- res.insert(path);
- }
+ Agent & run = *runningSubstituter;
+
+ string s = "have ";
+ foreach (PathSet::const_iterator, j, paths)
+ if (res.find(*j) == res.end()) { s += *j; s += " "; }
+ writeLine(run.toAgent.writeSide, s);
+ while (true) {
+ /* FIXME: we only read stderr when an error occurs, so
+ substituters should only write (short) messages to
+ stderr when they fail. I.e. they shouldn't write debug
+ output. */
+ Path path = getLineFromSubstituter(run);
+ if (path == "") break;
+ res.insert(path);
}
return res;
@@ -967,18 +882,18 @@ void LocalStore::querySubstitutablePathInfos(PathSet & paths, SubstitutablePathI
if (!settings.useSubstitutes) return;
if (!runningSubstituter) {
- std::unique_ptr<RunningSubstituter>fresh(new RunningSubstituter);
+ const Strings args = { "substitute", "--query" };
+ const std::map<string, string> env = { { "_NIX_OPTIONS", settings.pack() } };
+ std::unique_ptr<Agent> fresh(new Agent(settings.guixProgram, args, env));
runningSubstituter.swap(fresh);
}
- RunningSubstituter & run = *runningSubstituter;
- startSubstituter(run);
- if (run.disabled) return;
+ Agent & run = *runningSubstituter;
string s = "info ";
foreach (PathSet::const_iterator, i, paths)
if (infos.find(*i) == infos.end()) { s += *i; s += " "; }
- writeLine(run.to, s);
+ writeLine(run.toAgent.writeSide, s);
while (true) {
Path path = getLineFromSubstituter(run);
generated by cgit v1.2.3 (git 2.45.0) at 2024-11-22 10:58:27 +0000