major restructure of the training code

1 files changed, 71 insertions, 0 deletions

diff --git a/training/utils/libcall.pl b/training/utils/libcall.pl
new file mode 100644
index 00000000..c7d0f128
--- /dev/null
+++ b/training/utils/libcall.pl
@@ -0,0 +1,71 @@
+use IPC::Open3;
+use Symbol qw(gensym);
+
+$DUMMY_STDERR = gensym();
+$DUMMY_STDIN = gensym();
+
+# Run the command and ignore failures
+sub unchecked_call {
+    system("@_")
+}
+
+# Run the command and return its output, if any ignoring failures
+sub unchecked_output {
+    return `@_`
+}
+
+# WARNING: Do not use this for commands that will return large amounts
+# of stdout or stderr -- they might block indefinitely
+sub check_output {
+    print STDERR "Executing and gathering output: @_\n";
+
+    my $pid = open3($DUMMY_STDIN, \*PH, $DUMMY_STDERR, @_);
+    my $proc_output = "";
+    while( <PH> ) {
+	$proc_output .= $_;
+    }
+    waitpid($pid, 0);
+    # TODO: Grab signal that the process died from
+    my $child_exit_status = $? >> 8;
+    if($child_exit_status == 0) {
+	return $proc_output;
+    } else {
+	print STDERR "ERROR: Execution of @_ failed.\n";
+	exit(1);
+    }
+}
+
+# Based on Moses' safesystem sub
+sub check_call {
+    print STDERR "Executing: @_\n";
+    system(@_);
+    my $exitcode = $? >> 8;
+    if($exitcode == 0) {
+	return 0;
+    } elsif ($? == -1) {
+	print STDERR "ERROR: Failed to execute: @_\n  $!\n";
+	exit(1);
+
+    } elsif ($? & 127) {
+      printf STDERR "ERROR: Execution of: @_\n  died with signal %d, %s coredump\n",
+      ($? & 127),  ($? & 128) ? 'with' : 'without';
+      exit(1);
+
+    } else {
+	print STDERR "Failed with exit code: $exitcode\n" if $exitcode;
+	exit($exitcode);
+    }
+}
+
+sub check_bash_call {
+    my @args = ( "bash", "-auxeo", "pipefail", "-c", "@_");
+    check_call(@args);
+}
+
+sub check_bash_output {
+    my @args = ( "bash", "-auxeo", "pipefail", "-c", "@_");
+    return check_output(@args);
+}
+
+# perl module weirdness...
+return 1;