From 80b4055eab16e5b96015f128367d980f9fee4a1f Mon Sep 17 00:00:00 2001
From: axel <axel@liljencrantz.se>
Date: Sat, 18 Mar 2006 11:04:59 +1000
Subject: [PATCH] Add support for the -n switch to skip execution of any
 commands

darcs-hash:20060318010459-ac50b-9d9e5c489e0e4df2159d8c1d0ff952d42e2a2a82.gz
---
 exec.c                      |  7 +++++--
 main.c                      | 21 +++++++++++++++++++--
 parser.c                    |  2 +-
 proc.c                      |  2 ++
 proc.h                      |  6 ++++++
 share/completions/fish.fish |  1 +
 6 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/exec.c b/exec.c
index 9dff5985a..e93731608 100644
--- a/exec.c
+++ b/exec.c
@@ -653,8 +653,6 @@ void exec( job_t *j )
 	pid_t pid;
 	int mypipe[2];
 	sigset_t chldset; 
-	sigemptyset( &chldset );
-	sigaddset( &chldset, SIGCHLD );
 	int skip_fork;
 	
 	io_data_t pipe_read, pipe_write;
@@ -667,6 +665,11 @@ void exec( job_t *j )
 	*/
 	int exec_error=0;
 
+	if( no_exec )
+		return;
+	
+	sigemptyset( &chldset );
+	sigaddset( &chldset, SIGCHLD );
 	
 	debug( 4, L"Exec job '%ls' with id %d", j->command, j->job_id );	
 	
diff --git a/main.c b/main.c
index 9e0b90bcd..85f92f344 100644
--- a/main.c
+++ b/main.c
@@ -138,6 +138,10 @@ int main( int argc, char **argv )
 					"login", no_argument, 0, 'l' 
 				}
 				,
+				{
+					"no-execute", no_argument, 0, 'n' 
+				}
+				,
 				{
 					"profile", required_argument, 0, 'p' 
 				}
@@ -160,14 +164,14 @@ int main( int argc, char **argv )
 		
 		int opt = getopt_long( argc,
 							   argv, 
-							   "hilvc:p:d:", 
+							   "hilnvc:p:d:", 
 							   long_options, 
 							   &opt_index );
 		
 #else	
 		int opt = getopt( argc,
 						  argv, 
-						  "hilvc:p:d:" );
+						  "hilnvc:p:d:" );
 #endif
 		if( opt == -1 )
 			break;
@@ -210,6 +214,10 @@ int main( int argc, char **argv )
 				is_login=1;
 				break;				
 				
+			case 'n':
+				no_exec=1;
+				break;				
+				
 			case 'p':
 				profile = optarg;
 				break;				
@@ -236,6 +244,15 @@ int main( int argc, char **argv )
 	is_interactive_session &= isatty(STDIN_FILENO);	
 	is_interactive_session |= force_interactive;
 
+	/*
+	  No-exec is prohibited when in interactive mode
+	*/
+	if( is_interactive_session && no_exec)
+	{
+		debug( 1, _(L"Can not use the no-execute mode when running an interactive session") );
+		no_exec = 0;
+	}
+	
 	common_init();
 	halloc_util_init();	
 
diff --git a/parser.c b/parser.c
index 9ab8b5ca1..b882c6e33 100644
--- a/parser.c
+++ b/parser.c
@@ -2521,7 +2521,7 @@ int parser_test( wchar_t * buff,
 	current_tokenizer = &tok;
 
 	for( tok_init( &tok, buff, 0 );
-		 tok_has_next( &tok ) && !err;
+		 tok_has_next( &tok );
 		 tok_next( &tok ) )
 	{
 		current_tokenizer_pos = tok_get_pos( &tok );
diff --git a/proc.c b/proc.c
index 431d8e2cf..799cf2e1b 100644
--- a/proc.c
+++ b/proc.c
@@ -90,6 +90,8 @@ int is_event=0;
 int proc_had_barrier;
 pid_t proc_last_bg_pid = 0;
 int job_control_mode = JOB_CONTROL_INTERACTIVE;
+int no_exec=0;
+
 
 /**
    The event variable used to send all process event
diff --git a/proc.h b/proc.h
index 98b365b0f..274966602 100644
--- a/proc.h
+++ b/proc.h
@@ -231,6 +231,12 @@ extern pid_t proc_last_bg_pid;
 */
 extern int job_control_mode;
 
+/**
+   If this flag is set, fish will never fork or run execve.
+*/
+extern int no_exec;
+
+
 /**
    Sets the status of the last process to exit
 */
diff --git a/share/completions/fish.fish b/share/completions/fish.fish
index 4e20d92aa..5b34ac380 100644
--- a/share/completions/fish.fish
+++ b/share/completions/fish.fish
@@ -1,6 +1,7 @@
 complete -c fish -s c -l "command" -d (N_ "Run fish with this command")
 complete -c fish -s h -l help -d (N_ "Display help and exit")
 complete -c fish -s v -l version -d (N_ "Display version and exit")
+complete -c fish -s n -l no-execute -d (N_ "Only parse input, do not execute")
 complete -c fish -s i -l interactive -d (N_ "Run in interactive mode")
 complete -c fish -s l -l login -d (N_ "Run in login mode")
 complete -c fish -s p -l profile -d (N_ "Output profiling information to specified file") -f