system, home: Factorize default '.bashrc'.

* gnu/system/shadow.scm (%default-bashrc): New variable.  Source
/etc/bashrc only if it exists.
(default-skeletons): Use it.
* gnu/home/services/shells.scm (guix-bashrc): Remove.
(add-bash-configuration): Refer to '%default-bashrc' instead.

gnu/home/services/shells.scm

@@ -19,6 +19,7 @@
 
 (define-module (gnu home services shells)
   #:use-module (gnu services configuration)
+  #:autoload   (gnu system shadow) (%default-bashrc)
   #:use-module (gnu home services utils)
   #:use-module (gnu home services)
   #:use-module (gnu packages shells)
@@ -370,43 +371,6 @@ Used for executing user's commands at the exit of login shell.  It
 won't be read in some cases (if the shell terminates by exec'ing
 another process for example)."))
 
-;; TODO: Use value from (gnu system shadow)
-(define guix-bashrc
-  "\
-# Bash initialization for interactive non-login shells and
-# for remote shells (info \"(bash) Bash Startup Files\").
-
-# Export 'SHELL' to child processes.  Programs such as 'screen'
-# honor it and otherwise use /bin/sh.
-export SHELL
-
-if [[ $- != *i* ]]
-then
-    # We are being invoked from a non-interactive shell.  If this
-    # is an SSH session (as in \"ssh host command\"), source
-    # /etc/profile so we get PATH and other essential variables.
-    [[ -n \"$SSH_CLIENT\" ]] && source /etc/profile
-
-    # Don't do anything else.
-    return
-fi
-
-# Source the system-wide file.
-if [[ -e /etc/bashrc ]]; then
-    source /etc/bashrc
-fi
-
-# Adjust the prompt depending on whether we're in 'guix environment'.
-if [ -n \"$GUIX_ENVIRONMENT\" ]
-then
-    PS1='\\u@\\h \\w [env]\\$ '
-else
-    PS1='\\u@\\h \\w\\$ '
-fi
-alias ls='ls -p --color=auto'
-alias ll='ls -l'
-alias grep='grep --color=auto'\n")
-
 (define (add-bash-configuration config)
   (define (filter-fields field)
     (filter-configuration-fields home-bash-configuration-fields
@@ -449,7 +413,8 @@ if [ -f ~/.bashrc ]; then source ~/.bashrc; fi
      ,@(list (file-if-not-empty
               'bashrc
               (if (home-bash-configuration-guix-defaults? config)
-                  (list (serialize-field 'aliases) guix-bashrc)
+                  (list (serialize-field 'aliases)
+                        (plain-file-content %default-bashrc))
                   (list (serialize-field 'aliases))))
              (file-if-not-empty 'bash-logout)))))
 

gnu/system/shadow.scm

@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013-2020, 2022 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 Alex Griffin <a@ajgrf.com>
 ;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
@@ -63,7 +63,8 @@
                user-group-id
                user-group-system?)
 
-  #:export (default-skeletons
+  #:export (%default-bashrc
+            default-skeletons
             skeleton-directory
             %base-groups
             %base-user-accounts
@@ -118,14 +119,8 @@
          (create-home-directory? #f)
          (system? #t))))
 
-(define (default-skeletons)
+(define %default-bashrc
-  "Return the default skeleton files for /etc/skel.  These files are copied by
+  (plain-file "bashrc" "\
-'useradd' in the home directory of newly created user accounts."
-
-  (let ((profile (plain-file "bash_profile" "\
-# Honor per-interactive-shell startup file
-if [ -f ~/.bashrc ]; then . ~/.bashrc; fi\n"))
-        (bashrc  (plain-file "bashrc" "\
 # Bash initialization for interactive non-login shells and
 # for remote shells (info \"(bash) Bash Startup Files\").
 
@@ -145,7 +140,7 @@ then
 fi
 
 # Source the system-wide file.
-source /etc/bashrc
+[ -f /etc/bashrc ] && source /etc/bashrc
 
 # Adjust the prompt depending on whether we're in 'guix environment'.
 if [ -n \"$GUIX_ENVIRONMENT\" ]
@@ -157,6 +152,15 @@ fi
 alias ls='ls -p --color=auto'
 alias ll='ls -l'
 alias grep='grep --color=auto'\n"))
+
+(define (default-skeletons)
+  "Return the default skeleton files for /etc/skel.  These files are copied by
+'useradd' in the home directory of newly created user accounts."
+
+  (let ((profile (plain-file "bash_profile" "\
+# Honor per-interactive-shell startup file
+if [ -f ~/.bashrc ]; then . ~/.bashrc; fi\n"))
+        (bashrc  %default-bashrc)
         (zprofile    (plain-file "zprofile" "\
 # Honor system-wide environment variables
 source /etc/profile\n"))