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Intercept and prevent command from running in bash – Magento

Is it possible to intercept all commands in bash and the prevent some of the from executing? Like with ‘trap’ command, only disallow to execute the command further.

I’m a web developer and currently working on a small project/script that would help a web developer in daily life by adding different aliases dynamically. For instance, as a web developer, on Ubuntu one usually hosts all projects in /var/www/ structure, thus it is possible to alias those folders in that (/var/www) folder. I want to improve my script a bit and add aliases to projects depending on which framework they’re built. If it’s Magento 2, then by running setup:upgrade it should run “bin/magento setup:upgrade”.
I’ve tried trap ‘something’ DEBUG, but it is not possible to prevent the previous command, as far as I know.
Thanks!

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2

Answers


  1. 0

    You can veto commands by abusing command_not_found_handle:

    # Save the PATH
realpath="$PATH"
# Set a PATH without commands (weirdly can't be empty)
PATH="/"

command_not_found_handle() (
  if [[ "$1" == *d* ]]
  then
    echo "Sorry, no commands with 'd' allowed" >&2
    return 1
  else
    PATH="$realpath" 
    unset command_not_found_handle
    "$@"
  fi
)

    With this in your .bashrc, you can run ls and chown but not find or chmod. Note that it does not affect functions or builtins.

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  2. 0

    Yes, it is possible. trap ... DEBUG is a good start and if you want to prevent some commands, you must associate it with shopt -s extdebug. Then, if you return from the trap with a non-zero status, the command will not be executed.

    $ trap 'if [[ "$BASH_COMMAND" == "echo "* ]]; then printf "[%s]n" ${BASH_COMMAND#echo}; false; fi' DEBUG
$ set -T              # Necessary for subshells and functions
$ shopt -s extdebug
$ echo foo bar
[foo]
[bar]
$ trap - DEBUG
$ echo foo bar
foo bar
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