How to wrap a bash script so that it will correctly handle quotes and boolean operators - linux

Question

I am trying to create a wrapper command that will:
move to a different folder
change the current user
clear env variables
So far I created this /bin/app:
#!/bin/bash
cd /var/www/backend
if [[ $# == 0 ]];
then
exec chpst -u application env -i PATH="$PATH" /bin/bash
else
exec chpst -u application env -i PATH="$PATH" "$#"
fi
But I keep getting errors when running this commands:
app bin/console d:m:m
app bin/console d:m:m && sleep 10
app bin/console acme:bar "multi word data" "another multi word data"
First command just runs bin/console without parameters.
The second command shows error && command not found.
I also need support for cases like in third command.
What is the correct way to create a wrapper that works with more complex commands?
If this changes anything I need those to work inside docker eg.
docker-compose exec app app bin/console d:m:m
docker run acme/foo app bin/console d:m:m

Answer 1

This would work for you
#!/bin/bash
cd /var/www/backend || exit 1
# Pass argument 1 as shell script path and default to /bin/bash if none
shell_path="${1:-/bin/bash}"
shift
# Collect argument 2 and following arguments as shell script
shell_script="$*"
exec chpst -u application env -i PATH="$PATH" "$shell_path" -c "$shell_script"
Example usage:
app bin/console 'acme:bar "multi word data" "another multi word data"'
Another much cleaner option would be to pass the shell script as stdinput or a filename:
#!/bin/bash
cd /var/www/backend || exit 1
# Pass argument 1 as shell script path and default to /bin/bash if none
shell_path="${1:-/bin/bash}"
shift
# collect file name as argument 2. Use - for stdin if no file name
shell_file="${1:--}"
exec chpst -u application env -i PATH="$PATH" "$shell_path" <(
cat "$shell_file"
)
Example usage:
# here-string stdin
app bin/console <<<'acme:bar "multi word data" "another multi word data"'
Stored in a file console.script:
acme:bar "multi word data" "another multi word data"
Then:
app bin/console console.script