Allow setting system-wide prompt

README.rst

            # By default this script does nothing.
            exit 0
 
+Prompt
+~~~~~~
+
+Setting prompt is implemented by creating ``/etc/profile.d/prompt.sh``. Every
+user can have different prompt.
+
+.. code-block:: yaml
+
+    linux:
+      system:
+        prompt:
+          root: \\n\\[\\033[0;37m\\]\\D{%y/%m/%d %H:%M:%S} $(hostname -f)\\[\\e[0m\\]\\n\\[\\e[1;31m\\][\\u@\\h:\\w]\\[\\e[0m\\]
+          default: \\n\\D{%y/%m/%d %H:%M:%S} $(hostname -f)\\n[\\u@\\h:\\w]
+
+On Debian systems to set prompt system-wide it's necessary to remove setting
+PS1 in ``/etc/bash.bashrc`` and ``~/.bashrc`` (which comes from
+``/etc/skel/.bashrc``). This formula will do this automatically, but will not
+touch existing user's ``~/.bashrc`` files.
 
 Linux network
 -------------

linux/files/prompt.sh

+{%- from "linux/map.jinja" import system with context %}
+
+# Don't set special prompt when not using Bash or ZSH
+[ -n "$BASH_VERSION" -o -n "$ZSH_VERSION" ] || return 0
+
+# Don't set prompt on non-interactive shell
+[[ $- == *i* ]] || return 0
+
+{%- for user, prompt in system.prompt.iteritems() %}
+{% if user != default %}
+if [ "$USERNAME" == "{{ user }}" ]; then
+  export PS1="{{ prompt }} "
+  return 0
+fi
+{% endif %}
+{%- endfor %}
+
+{% if system.prompt.default is defined %}
+export PS1="{{ system.prompt.default }} "
+{%- endif %}

linux/system/init.sls

 {%- if system.limit|length > 0 %}
 - linux.system.limit
 {%- endif %}
+{%- if system.prompt is defined %}
+- linux.system.prompt
+{%- endif %}

linux/system/prompt.sls

+{%- from "linux/map.jinja" import system with context %}
+{%- if system.enabled %}
+
+/etc/profile.d/prompt.sh:
+  file.managed:
+    - source: salt://linux/files/prompt.sh
+    - template: jinja
+
+/etc/bash.bashrc:
+  file.replace:
+    - pattern: ".*PS1=.*"
+    - repl: "# Prompt is set by /etc/profile.d/prompt.sh"
+
+/etc/skel/.bashrc:
+  file.replace:
+    - pattern: ".*PS1=.*"
+    - repl: "# Prompt is set by /etc/profile.d/prompt.sh"
+
+{%- endif %}