What is the best way to execute a script when entering into a directory?
When I move into a new directory I would like bash to execute the projectSettings.bash script much like RVM does.
You can make cd a function (and pop and pushd), and make it detect if you enter that particular directory.
cd () { builtin cd "$@" && chpwd; }
pushd () { builtin pushd "$@" && chpwd; }
popd () { builtin popd "$@" && chpwd; }
unset_all_project_settings () {
# do whatever it takes to undo the effect of projectSettings.bash,
# e.g. unset variables, remove PATH elements, etc.
}
chpwd () {
case $PWD in
/some/directory|/some/other/directory) . ./projectSettings.bash;;
*) unset_all_project_settings;;
esac
}
Do not do this in directories that you haven't whitelisted, because it would make it very easy for someone to trick you into running arbitrary code — send you an archive, so you unzip it, change into the directory it created, and you've now run the attacker's code.
I don't recommend this approach, because it means the script will be executed even if you enter that directory for some reason that's unrelated to working on the project. I suggest having a specific function that changes to the project directory and sources the settings script.
myproj () {
cd /some/directory && . ./projectSettings.bash
}
Collected from the Internet
Please contact [email protected] to delete if infringement.
Comments