My command execution put to the background

help
1

Context : I'm developing tests for a java program.

I have a shell script that links java code and interpret it.

In another folder, I wanted to execute this script with the Command struct, and with the currrent_dir function.

When I try my code, the shell script seems to work well, however at a moment of the execution, the execution is automatically put to the background but I don't know why.

I don't want the execution to be put to the background, would someone know how to stop this automatic behaviour ?

Here the part of my code causing the background mode activated for the Command execution :

let output = Command::new("/usr/bin/bash")
                         .current_dir("/home/admin/Desktop/work/dev")
                         .args(["-ic", ProgExeAlias])
                         .output()
                         .expect("ERROR on executing the bash alias for\
                                 executing the program.");

It seems to be related to the bash interractive mode (the -i option).

Thanks.

2

By "background mode", do you mean that it doesn't show stdout or allow you to input test on stdin?

I think it becomes more complicated to both collect output and display it, using spawn() (instead of output()) and manually reading from the stdio handle.

1 Like
3

Instead of giving the normal ouput I got a "Stopped" and then no more informations :

image
image596×632 30.8 KB

So as the above image testifies :
I did a fg 2 and I had the second test begin run.
fg 2 again and this time the third and last test was being run.
fg 2 again, and then I got the final result.

I noticed that I could wait as long as I wanted between each fg command, it's like if the processus had been on pause once it had been "Stopped" and that by doing the foreground command I resumed it.

So the main problem with all that is that I have to each time "resume" the following test by doing a fg.

However I found a solution to the problem : rather than calling an alias (ProgExeAlias) which execute a shell script, I've created a new shell script that does what the alias does, and now I merely directly call this shell script, and that works.

Nonetheless, I don't think that the solution I found is the "real" one to the original problem.

4

When you call .status(), you're setting up the command to be executed with no stdin. But bash's -i required stdin to prompt the user.

You can either remove -i or use .stdin(Stdio::piped()) and write to the pipe (refer to the second example of Stdio in std::process - Rust for details).

5

I'm not using .status() nor stdin ; your proposal doesn't work.

6

Sorry, I meant output() instead of status(). See Command in std::process - Rust

7

Ok. Since I do not need to write to stdin, your proposal still doesn't work.