complete-run: implement --strace, make --valgrind log to test-specific file

testcases/complete-run.pl

@@ -51,6 +51,7 @@ sub Log { say $log "@_" }
 
 my $coverage_testing = 0;
 my $valgrind = 0;
+my $strace = 0;
 my $help = 0;
 # Number of tests to run in parallel. Important to know how many Xdummy
 # instances we need to start (unless @displays are given). Defaults to
@@ -62,6 +63,7 @@ my @childpids = ();
 my $result = GetOptions(
     "coverage-testing" => \$coverage_testing,
     "valgrind" => \$valgrind,
+    "strace" => \$strace,
     "display=s" => \@displays,
     "parallel=i" => \$parallel,
     "help|?" => \$help,
@@ -171,8 +173,9 @@ sub take_job {
             display => $display,
             configfile => $tmpfile,
             outdir => $outdir,
-            logpath => $logpath,
+            testname => $basename,
             valgrind => $valgrind,
+            strace => $strace,
             cv => $activate_cv
         );
 
@@ -239,7 +242,7 @@ sub take_job {
         my $output;
         open(my $spool, '>', \$output);
         my $parser = TAP::Parser->new({
-            exec => [ 'sh', '-c', qq|DISPLAY=$display LOGPATH="$logpath" OUTDIR="$outdir" VALGRIND=$valgrind /usr/bin/perl -Ilib $test| ],
+            exec => [ 'sh', '-c', qq|DISPLAY=$display TESTNAME="$basename" OUTDIR="$outdir" VALGRIND=$valgrind STRACE=$strace /usr/bin/perl -Ilib $test| ],
             spool => $spool,
             merge => 1,
         });
@@ -354,7 +357,12 @@ complete-run.pl will start (num_cores * 2) Xdummy instances.
 =item B<--valgrind>
 
 Runs i3 under valgrind to find memory problems. The output will be available in
-C<latest/valgrind.log>.
+C<latest/valgrind-for-$test.log>.
+
+=item B<--strace>
+
+Runs i3 under strace to trace system calls. The output will be available in
+C<latest/strace-for-$test.log>.
 
 =item B<--coverage-testing>
 

testcases/lib/SocketActivation.pm

@@ -75,16 +75,31 @@ sub activate_i3 {
         # the interactive signalhandler to make it crash immediately instead.
         my $i3cmd = abs_path("../i3") . " -V -d all --disable-signalhandler";
 
+        # For convenience:
+        my $outdir = $args{outdir};
+        my $test = $args{testname};
+
         if ($args{valgrind}) {
             $i3cmd =
-                qq|valgrind -v --log-file="$args{outdir}/valgrind.log" | .
+                qq|valgrind -v --log-file="$outdir/valgrind-for-$test.log" | .
                 qq|--leak-check=full --track-origins=yes --num-callers=20 | .
                 qq|--tool=memcheck -- $i3cmd|;
         }
 
-        # Append to $args{logpath} instead of overwriting because i3 might be
+        my $logfile = "$outdir/i3-log-for-$test";
+        # Append to $logfile instead of overwriting because i3 might be
         # run multiple times in one testcase.
-        my $cmd = "exec $i3cmd -c $args{configfile} >>$args{logpath} 2>&1";
+        my $cmd = "exec $i3cmd -c $args{configfile} >>$logfile 2>&1";
+
+        if ($args{strace}) {
+            my $out = "$outdir/strace-for-$test.log";
+
+            # We overwrite LISTEN_PID with the correct process ID to make
+            # socket activation work (LISTEN_PID has to match getpid(),
+            # otherwise the LISTEN_FDS will be treated as a left-over).
+            $cmd = qq|strace -fF -s2048 -v -o "$out" -- | .
+                     'sh -c "export LISTEN_PID=\$\$; ' . $cmd . '"';
+        }
 
         # We need to use the shell due to using output redirections.
         exec '/bin/sh', '-c', $cmd;

testcases/lib/i3test.pm

@@ -434,8 +434,9 @@ sub launch_with_config {
         display => $ENV{DISPLAY},
         configfile => $tmpfile,
         outdir => $ENV{OUTDIR},
-        logpath => $ENV{LOGPATH},
+        testname => $ENV{TESTNAME},
         valgrind => $ENV{VALGRIND},
+        strace => $ENV{STRACE},
         cv => $cv,
     );