[bug#50873] [PATCH 1/7] guix home: import: Make the user to specify a destination directory.

[Xinglu Chen <public@yoctocell.xyz>]

Copy the appropriate the relevant configuration files to the destination
directory, and call ‘local-file’ on them.

Without this, ‘guix home import’ will generate a service declaration like this

  (service
   home-bash-service-type
   (home-bash-configuration
    (bashrc
     (list (slurp-file-gexp
            (local-file "/home/yoctocell/.bashrc"))))))

but when running ‘guix home reconfigure’, the ~/.bashrc file would be moved, so
when running ‘guix home reconfigure’ for the second time, it would read the
~/.bashrc which is itself a symlink to a file the store.

* guix/scripts/home/import.scm (%destination-directory): New parameter.
(generate-bash-module+configuration): Adjust accordingly.
(modules+configurations): Copy the user’s configuration file to
‘%destination-directory’.
* guix/scripts/home.scm (process-command): Adjust accordingly; create
‘%destination-directory’ if it doesn’t exist.
---
 guix/scripts/home.scm        | 25 +++++++-----
 guix/scripts/home/import.scm | 75 +++++++++++++++++++++---------------
 2 files changed, 61 insertions(+), 39 deletions(-)

diff --git a/guix/scripts/home.scm b/guix/scripts/home.scm
index 55e7b436c1..520360e14a 100644
--- a/guix/scripts/home.scm
+++ b/guix/scripts/home.scm
@@ -40,6 +40,7 @@ (define-module (guix scripts home)
   #:autoload   (guix scripts pull) (channel-commit-hyperlink)
   #:use-module (guix scripts home import)
   #:use-module ((guix status) #:select (with-status-verbosity))
+  #:use-module ((guix build utils) #:select (mkdir-p))
   #:use-module (guix gexp)
   #:use-module (guix monads)
   #:use-module (srfi srfi-1)
@@ -260,15 +261,21 @@ (define-syntax-rule (with-store* store exp ...)
      (apply search args))
     ((import)
      (let* ((profiles (delete-duplicates
-                      (match (filter-map (match-lambda
-                                           (('profile . p) p)
-                                           (_              #f))
-                                         opts)
-                        (() (list %current-profile))
-                        (lst (reverse lst)))))
-           (manifest (concatenate-manifests
-                      (map profile-manifest profiles))))
-       (import-manifest manifest (current-output-port))))
+                       (match (filter-map (match-lambda
+                                            (('profile . p) p)
+                                            (_              #f))
+                                          opts)
+                         (() (list %current-profile))
+                         (lst (reverse lst)))))
+            (manifest (concatenate-manifests
+                       (map profile-manifest profiles)))
+            (destination (match args
+                           ((destination) destination)
+                           (_ (leave (G_ "wrong number of arguments~%"))))))
+       (unless (file-exists? destination)
+         (mkdir-p destination))
+       (parameterize ((%destination-directory destination))
+         (import-manifest manifest (current-output-port)))))
     ((describe)
      (match (generation-number %guix-home)
        (0
diff --git a/guix/scripts/home/import.scm b/guix/scripts/home/import.scm
index 611f580e85..a6ab68a32c 100644
--- a/guix/scripts/home/import.scm
+++ b/guix/scripts/home/import.scm
@@ -27,7 +27,8 @@ (define-module (guix scripts home import)
   #:use-module (ice-9 pretty-print)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-26)
-  #:export (import-manifest))
+  #:export (import-manifest
+            %destination-directory))
 
 ;;; Commentary:
 ;;;
@@ -36,27 +37,34 @@ (define-module (guix scripts home import)
 ;;;
 ;;; Code:
 
+(define %destination-directory
+  (make-parameter (string-append (getenv "HOME") "/src/guix-config")))
 
 (define (generate-bash-module+configuration)
-  (let ((rc (string-append (getenv "HOME") "/.bashrc"))
-        (profile (string-append (getenv "HOME") "/.bash_profile"))
-        (logout (string-append (getenv "HOME") "/.bash_logout")))
-    `((gnu home services bash)
-      (service home-bash-service-type
-                 (home-bash-configuration
-                  ,@(if (file-exists? rc)
-                        `((bashrc
-                           (list (local-file ,rc))))
-                        '())
-                  ,@(if (file-exists? profile)
-                        `((bash-profile
-                           (list (local-file ,profile))))
-                        '())
-                  ,@(if (file-exists? logout)
-                        `((bash-logout
-                           (list (local-file ,logout))))
-                        '()))))))
+  (define (destination-append path)
+    (string-append (%destination-directory) "/" path))
 
+  (let ((rc (destination-append ".bashrc"))
+        (profile (destination-append ".bash_profile"))
+        (logout (destination-append ".bash_logout")))
+    `((gnu home-services bash)
+      (service home-bash-service-type
+               (home-bash-configuration
+                ,@(if (file-exists? rc)
+                      `((bashrc
+                         (list (slurp-file-gexp
+                                (local-file ,rc)))))
+                      '())
+                ,@(if (file-exists? profile)
+                      `((bash-profile
+                         (list (slurp-file-gexp
+                                (local-file ,profile)))))
+                      '())
+                ,@(if (file-exists? logout)
+                      `((bash-logout
+                         (list (slurp-file-gexp
+                                (local-file ,logout)))))
+                      '()))))))
 
 (define %files-configurations-alist
   `((".bashrc" . ,generate-bash-module+configuration)
@@ -64,17 +72,24 @@ (define %files-configurations-alist
     (".bash_logout" . ,generate-bash-module+configuration)))
 
 (define (modules+configurations)
-  (let ((configurations (delete-duplicates
-                         (filter-map (match-lambda
-                                ((file . proc)
-                                 (if (file-exists?
-                                      (string-append (getenv "HOME") "/" file))
-                                     proc
-                                     #f)))
-                                     %files-configurations-alist)
-                         (lambda (x y)
-                           (equal? (procedure-name x) (procedure-name y))))))
-    (map (lambda (proc) (proc)) configurations)))
+  (define configurations
+    (delete-duplicates
+     (filter-map (match-lambda
+                   ((file . proc)
+                    (let ((absolute-path (string-append (getenv "HOME")
+                                                        "/" file)))
+                      (if (file-exists? absolute-path)
+                          (begin
+                            (copy-file absolute-path
+                                       (string-append
+                                        (%destination-directory) "/" file))
+                            proc)
+                          #f))))
+                 %files-configurations-alist)
+     (lambda (x y)
+       (equal? (procedure-name x) (procedure-name y)))))
+  
+    (map (lambda (proc) (proc)) configurations))
 
 ;; Based on `manifest->code' from (guix profiles)
 ;; MAYBE: Upstream it?
-- 
2.33.0