(bash script) Better/Nicest way to perform this if statement inside folders?-CodePudding

I have this directory structure, and i need to generate symlinks for /common/provider.tf in both /environments/prod and /environments/prod/module

/
├─ common
│  ├─ provider.tf
├─ environments/
│  ├─ prod/
│  │  ├─ module/

I managed to do it this way:

  if [ -e "../../../common/provider.tf" ]; then #i'm in /environments/prod/module
    ln -s ../../../common/provider.tf provider.tf
  else #i'm in the root folder "/"
    ln -s common/provider.tf $environment/provider.tf #$environment is /environments/prod
  fi

But i realize that my code sucks and i can't came with a better idea.

Any idea on how to do it better? note: there are lots of environments and lots of modules, i'm using that code recursively.

CodePudding user response：

Store the absolute path to the root directory, and construct the various link destination paths relative to this reference root directory.

#!/bin/sh

root_dir='/absolute/path/to/root/dir'
provider_tf="${root_dir}/common/provider.tf"
prod_dir="${root_dir}/environments/prod"
module_dir="${prod_dir}/module"

for dest_dir in "${prod_dir}" "${module_dir}"; do
  ln --symbolic --relative "${provider_tf}" "${dest_dir}/"
done

CodePudding user response：

The OS actually doesn't care at all what your symlink points to. You can do

ln -s /no/such/path brokenlink

and similarly you can

ln -s ../../../common/provider.tf /environments/prod/module/provider.tf

regardless of what your current directory is; the symlink will be resolved relative to the directory where you created it.