system: Factorize bashrc default configuration.

This factorizes out the remaining bashrc bits from /etc/skel/.bashrc to a the
template used for both /etc/bashrc on Guix System and ~/.bashrc for
home-bash-service-type.

Rationale: The use of /etc/skel introduce state: the file is only copied
originally when the user account is created, and never (automatically)
refreshed again.

* gnu/system.scm (operating-system-etc-service):
<profile>: Guard against souring /etc/bashrc in non-interactive, SSH case.
<bashrc>: Use %default-bashrc, having migrated the remaining definitions to...
* gnu/system/shadow.scm (%default-bashrc): ... here.  Factorize aliases to...
* gnu/services.scm (%default-bash-aliases): ... here.
(%default-bashrc-d-aliases): New variable.
(%default-etc-bashrc-d-files): Include it in the default configuration.
* gnu/services/base.scm (%base-services): Register etc-bashrc-d-service-type.
* gnu/home/services/shells.scm (add-bash-configuration): Do not set PS1, now
part of %default-bashrc.
(home-bash-configuration) [guix-defaults?]: Update doc.
[aliases]: Set %default-bash-aliases as the default value.  Update doc.
* doc/guix.texi (Shells Home Services): Update documentation.
(Service Reference): Update example.

Change-Id: I340c614983a78fd20a9c4a9705e7fc542ae9b513

1 files changed, 7 insertions, 7 deletions

diff --git a/gnu/home/services/shells.scm b/gnu/home/services/shells.scm
index bab5730c3d6..969a3eb8dcf 100644
--- a/gnu/home/services/shells.scm
+++ b/gnu/home/services/shells.scm
@@ -20,6 +20,7 @@
 
 (define-module (gnu home services shells)
   #:use-module (gnu services configuration)
+  #:use-module ((gnu services) #:select (%default-bash-aliases))
   #:autoload   (gnu system shadow) (%default-bashrc %default-zprofile)
   #:use-module (gnu home services utils)
   #:use-module (gnu home services)
@@ -333,9 +334,12 @@ another process for example)."))
    (package bash)
    "The Bash package to use.")
   (guix-defaults?
+   ;; TODO: Set to #f when the target system is determined to be Guix System.
    (boolean #t)
-   "Add sane defaults like reading @file{/etc/bashrc} and coloring the output of
-@command{ls} to the top of the @file{.bashrc} file.")
+   "Add sane defaults like setting @env{PS1}, @env{SHELL}, and ensuring
+@file{/etc/profile} is sourced for non-interactive SSH shells.  If you use
+Guix System, is it safe to set this to @code{#f}, as in this case this is
+already taken care of by the globally installed @file{/etc/bashrc}.")
   (environment-variables
    (alist '())
    "Association list of environment variables to set for the Bash session.  The
@@ -344,7 +348,7 @@ here (@pxref{Essential Home Services}).  The contents of this field will be
 added after the contents of the @code{bash-profile} field."
    (serializer serialize-posix-env-vars))
   (aliases
-   (alist '())
+   (alist %default-bash-aliases)
    "Association list of aliases to set for the Bash session.  The aliases will be
 defined after the contents of the @code{bashrc} field has been put in the
 @file{.bashrc} file.  The alias will automatically be quoted, so something line
@@ -423,10 +427,6 @@ if [ -f ~/.bashrc ]; then source ~/.bashrc; fi
               'bashrc
               (if (home-bash-configuration-guix-defaults? config)
                   (list (plain-file-content %default-bashrc) "\n"
-                        ;; The host distro might provide a bad 'PS1'
-                        ;; default--e.g., not taking $GUIX_ENVIRONMENT into
-                        ;; account.  Provide a good default here when asked.
-                        "PS1='\\u@\\h \\w${GUIX_ENVIRONMENT:+ [env]}\\$ '\n"
                         (serialize-field 'aliases))
                   (list (serialize-field 'aliases))))
              (file-if-not-empty 'bash-logout)))))