Consider exec'ing Argcfile

[CGamesPlay]

A small change which would be a bit more hygienic is to exec the Argcfile.sh when it's used.

Consider an Argcfile.sh like this one:

#!/usr/bin/env bash

main() {
    exec bash
}

eval "$(argc --argc-eval "$0" "$@")"

When we run this, it results in a process tree like this one:

$ ps uf
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
ubuntu      2034  0.1  0.0 247380 17112 pts/1    Ss   10:40   0:06 -fish
ubuntu     36428  0.0  0.0   3304     4 pts/1    Sl   11:53   0:00  \_ argc
ubuntu     36430  1.0  0.0   8664  5436 pts/1    S+   11:53   0:00      \_ bash

The feature request is for argc (PID 36428) to use exec when it runs the Argcfile.sh, instead of starting it as a child process. This is minor but would be slightly cleaner.

[sigoden]

@CGamesPlay
I don't understand what you said.

fish runs argc
argc locates Argcfile.sh and runsbash Argcfile.sh
bash does the rest

Which part needs improvement?

[CGamesPlay]

Instead of running bash Argcfile.sh as a subcommand, it should exec bash Argcfile.sh. This would replace the argc process with the bash process. The desired process tree would look like this:

$ ps uf
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
ubuntu      2034  0.1  0.0 247380 17112 pts/1    Ss   10:40   0:06 -fish
ubuntu     36430  1.0  0.0   8664  5436 pts/1    S+   11:53   0:00  \_ bash

[sigoden]

Three is no way to get rid of argc process in the ps tree.

Bash is invoked outside of the script, no exec exists.

[CGamesPlay]

Yes, bash is invoked by argc as a child process. The request is to exec the process instead of spawning it. Basically, switch to exec instead of status. By using exec, the argc process itself is replaced by bash. Then the Argcfile.sh can exec another bash, resulting in the desired ps tree.

[sigoden]

Does exec return exit statuscode?

[CGamesPlay]

No, it actually doesn't return at all. The argc process would be entirely replaced by the target command. However, because the process is replaced in-place, the parent of argc will continue waiting for the new process, and will receive the exit code from the new process once the new process finishes.

[CGamesPlay]

Fantastic! Thank you 🙂