Fix passwordless sudo for vagrant when GNU sed is installed

tasks/sudoers.yml

@@ -1,10 +1,21 @@
 ---
+# If the user installs GNU sed through homebrew the path is different.
+- name: Register path to sed.
+  command: which sed
+  register: sed_which_result
+  changed_when: false
+  when: sed_path is undefined
+
+- name: Define sed_path variable.
+  set_fact:
+    sed_path: "{{ sed_which_result.stdout }}"
+  when: sed_path is undefined
+
 # Sudoers configuration (enables more convenient Vagrant usage).
 - name: Copy sudoers configuration into place.
-  copy:
-    src: files/etc/sudoers
+  template:
+    src: templates/sudoers.j2
     dest: /etc/sudoers
     mode: 0440
     validate: 'visudo -cf %s'
   become: yes
-  when: configure_sudoers

templates/sudoers.j2

@@ -47,7 +47,7 @@ root    ALL=(ALL) ALL
 # Vagrant sudoers config
 Cmnd_Alias VAGRANT_EXPORTS_ADD = /usr/bin/tee -a /etc/exports
 Cmnd_Alias VAGRANT_NFSD = /sbin/nfsd restart
-Cmnd_Alias VAGRANT_EXPORTS_REMOVE = /usr/bin/sed -E -e /*/ d -ibak /etc/exports
+Cmnd_Alias VAGRANT_EXPORTS_REMOVE = {{ sed_path }} -E -e /*/ d -ibak /etc/exports
 Cmnd_Alias VAGRANT_HOSTS_ADD = /bin/sh -c echo "*" >> /etc/hosts
-Cmnd_Alias VAGRANT_HOSTS_REMOVE = /usr/bin/sed -i -e /*/ d /etc/hosts
+Cmnd_Alias VAGRANT_HOSTS_REMOVE = {{ sed_path }} -i -e /*/ d /etc/hosts
 %admin ALL=(root) NOPASSWD: VAGRANT_EXPORTS_ADD, VAGRANT_NFSD, VAGRANT_EXPORTS_REMOVE, VAGRANT_HOSTS_ADD, VAGRANT_HOSTS_REMOVE