From 658c46ea8ef6d7022cb8c8e06565ebce12842d0b Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Wed, 8 Oct 2014 23:08:16 +0300
Subject: [PATCH] Rewrite ExternalTask to use Msp::Process

---
 source/externaltask.cpp | 98 ++++++++++++++++++-----------------------
 source/externaltask.h   |  5 ++-
 2 files changed, 45 insertions(+), 58 deletions(-)

diff --git a/source/externaltask.cpp b/source/externaltask.cpp
index 643831e..3cc8eca 100644
--- a/source/externaltask.cpp
+++ b/source/externaltask.cpp
@@ -11,15 +11,18 @@
 using namespace std;
 using namespace Msp;
 
-ExternalTask::ExternalTask(const vector<string> &a, const FS::Path &wd):
+ExternalTask::ExternalTask(const Arguments &a, const FS::Path &wd):
 	argv(a),
 	work_dir(wd),
-	pid(-1),
+	process(0),
 	exit_code(-1),
 	stdout_dest(PASSTHROUGH),
 	stderr_dest(PASSTHROUGH),
 	capture_pipe(0)
-{ }
+{
+	if(argv.empty())
+		throw invalid_argument("ExternalTask::ExternalTask");
+}
 
 ExternalTask::~ExternalTask()
 {
@@ -47,49 +50,39 @@ string ExternalTask::get_command() const
 
 void ExternalTask::start()
 {
-	if(stdout_dest==CAPTURE || stderr_dest==CAPTURE)
-		capture_pipe = new IO::Pipe;
+	IO::File *devnull = 0;
 
 	prepare();
 
-	if((pid = fork()))
+	process = new Process;
+
+	if(stdout_dest==IGNORE || stderr_dest==IGNORE)
 	{
-		if(pid==-1)
-			exit_code = 1026;
-		else
-			exit_code = 0;
+		devnull = new IO::File("/dev/null", IO::M_WRITE);
+		if(stdout_dest==IGNORE)
+			process->redirect_cout(*devnull);
+		if(stderr_dest==IGNORE)
+			process->redirect_cerr(*devnull);
 	}
-	else
+
+	if(stdout_dest==CAPTURE || stderr_dest==CAPTURE)
 	{
-		vector<const char *> cargv(argv.size()+1);
-		for(unsigned i=0; i<argv.size(); ++i)
-			cargv[i] = argv[i].c_str();
-		cargv.back() = 0;
+		capture_pipe = new IO::Pipe;
+		if(stdout_dest==CAPTURE)
+			process->redirect_cout(*capture_pipe);
+		if(stderr_dest==CAPTURE)
+			process->redirect_cerr(*capture_pipe);
+	}
 
-		if(stdout_dest==IGNORE || stderr_dest==IGNORE)
-		{
-			IO::File devnull("/dev/null", IO::M_WRITE);
-			if(stdout_dest==IGNORE)
-				IO::cout.redirect(devnull);
-			if(stderr_dest==IGNORE)
-				IO::cerr.redirect(devnull);
-		}
+	if(!work_dir.empty())
+		process->set_working_directory(work_dir);
 
-		if(capture_pipe)
-		{
-			if(stdout_dest==CAPTURE)
-				IO::cout.redirect(*capture_pipe);
-			if(stderr_dest==CAPTURE)
-				IO::cerr.redirect(*capture_pipe);
-			delete capture_pipe;
-		}
+	Process::Arguments args(argv.begin()+1, argv.end());
+	process->execute(argv.front(), args);
+	if(capture_pipe)
+		capture_pipe->set_mode(IO::M_READ);
 
-		if(!work_dir.empty())
-			FS::chdir(work_dir);
-		execvp(cargv.front(), const_cast<char *const *>(&cargv.front()));
-		IO::print("Couldn't execute %s\n", argv.front());
-		exit(1);
-	}
+	delete devnull;
 }
 
 Task::Status ExternalTask::check()
@@ -104,34 +97,27 @@ Task::Status ExternalTask::wait()
 
 Task::Status ExternalTask::do_wait(bool block)
 {
-	if(pid>0)
+	if(process)
 	{
-		int status;
-		if(waitpid(pid, &status, (block ? 0 : WNOHANG))==pid)
+		if(process->wait(block))
 		{
-			if(WIFEXITED(status))
-				exit_code = WEXITSTATUS(status);
-			else if(WIFSIGNALED(status))
-				exit_code = 256+WTERMSIG(status);
-			else
-				exit_code = 1025;
-			pid = 0;
+			exit_code = process->get_exit_code();
+			delete process;
+			process = 0;
 		}
 
 		// Do this after waiting to avoid a race condition
-		if(capture_pipe)
+		while(capture_pipe && IO::poll(*capture_pipe, IO::P_INPUT, Time::zero))
 		{
-			while(IO::poll(*capture_pipe, IO::P_INPUT, Time::zero))
-			{
-				char buf[1024];
-				unsigned len = capture_pipe->read(buf, sizeof(buf));
+			char buf[1024];
+			unsigned len = capture_pipe->read(buf, sizeof(buf));
+			if(len)
 				output.append(buf, len);
-				if(len<sizeof(buf))
-					break;
-			}
+			else
+				break;
 		}
 
-		if(pid>0)
+		if(process)
 			return RUNNING;
 		else
 			signal_finished.emit(!exit_code);
diff --git a/source/externaltask.h b/source/externaltask.h
index cb8464b..992df5c 100644
--- a/source/externaltask.h
+++ b/source/externaltask.h
@@ -3,6 +3,7 @@
 
 #include <string>
 #include <vector>
+#include <msp/core/process.h>
 #include <msp/fs/path.h>
 #include <msp/io/pipe.h>
 #include "task.h"
@@ -22,12 +23,12 @@ public:
 		IGNORE        //< Redirect the stream to oblivion
 	};
 
-	typedef std::vector<std::string> Arguments;
+	typedef Msp::Process::Arguments Arguments;
 
 private:
 	Arguments argv;
 	Msp::FS::Path work_dir;
-	int pid;
+	Msp::Process *process;
 	int exit_code;
 	Destination stdout_dest;
 	Destination stderr_dest;
-- 
2.43.0