From d5e9abb0395a21e79d4f77181597103d4daf138c Mon Sep 17 00:00:00 2001
From: Alex Kost <alezost@gmail.com>
Date: Wed, 8 Oct 2014 00:32:28 +0400
Subject: [PATCH 1/3] profiles: Add condition types for profile and generation.

* guix/profiles.scm (&profile-error, &generation-error): New condition types.
* guix/ui.scm (call-with-error-handling): Handle these types.
* guix/scripts/package.scm (roll-back, guix-package): Raise '&profile-error'
  where needed.
---
 guix/profiles.scm        | 24 +++++++++++++++++++++++-
 guix/scripts/package.scm | 15 +++++++--------
 guix/ui.scm              |  7 +++++++
 3 files changed, 37 insertions(+), 9 deletions(-)

diff --git a/guix/profiles.scm b/guix/profiles.scm
index 18733a6..0e19d7a 100644
--- a/guix/profiles.scm
+++ b/guix/profiles.scm
@@ -35,7 +35,16 @@
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-19)
   #:use-module (srfi srfi-26)
-  #:export (manifest make-manifest
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
+  #:export (&profile-error
+            profile-error?
+            profile-error-profile
+            &generation-error
+            generation-error?
+            generation-error-generation
+
+            manifest make-manifest
             manifest?
             manifest-entries
 
@@ -84,6 +93,19 @@
 
 
 ;;;
+;;; Condition types.
+;;;
+
+(define-condition-type &profile-error &error
+  profile-error?
+  (profile profile-error-profile))
+
+(define-condition-type &generation-error &error
+  generation-error?
+  (generation generation-error-generation))
+
+
+;;;
 ;;; Manifests.
 ;;;
 
diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index fc9c37b..7e2143c 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -38,6 +38,8 @@
   #:use-module (srfi srfi-11)
   #:use-module (srfi srfi-19)
   #:use-module (srfi srfi-26)
+  #:use-module (srfi srfi-34)
+  #:use-module (srfi srfi-35)
   #:use-module (srfi srfi-37)
   #:use-module (gnu packages)
   #:use-module (gnu packages base)
@@ -109,8 +111,7 @@ return PROFILE unchanged.  The goal is to treat '-p ~/.guix-profile' as if
          (previous-number     (previous-generation-number profile number))
          (previous-generation (generation-file-name profile previous-number)))
     (cond ((not (file-exists? profile))                 ; invalid profile
-           (leave (_ "profile '~a' does not exist~%")
-                  profile))
+           (raise (condition (&profile-error (profile profile)))))
           ((zero? number)                               ; empty profile
            (format (current-error-port)
                    (_ "nothing to do: already at the empty profile~%")))
@@ -723,8 +724,7 @@ more information.~%"))
             (match-lambda
              (('delete-generations . pattern)
               (cond ((not (file-exists? profile)) ; XXX: race condition
-                     (leave (_ "profile '~a' does not exist~%")
-                            profile))
+                     (raise (condition (&profile-error (profile profile)))))
                     ((string-null? pattern)
                      (delete-generations
                       (%store) profile
@@ -833,8 +833,7 @@ more information.~%"))
              (newline)))
 
          (cond ((not (file-exists? profile)) ; XXX: race condition
-                (leave (_ "profile '~a' does not exist~%")
-                       profile))
+                (raise (condition (&profile-error (profile profile)))))
                ((string-null? pattern)
                 (for-each list-generation (profile-generations profile)))
                ((matching-generations pattern profile)
@@ -915,8 +914,8 @@ more information.~%"))
         (_ #f))))
 
   (let ((opts (parse-options)))
-    (or (process-query opts)
-        (with-error-handling
+    (with-error-handling
+      (or (process-query opts)
           (parameterize ((%store (open-connection)))
             (set-build-options-from-command-line (%store) opts)
 
diff --git a/guix/ui.scm b/guix/ui.scm
index 04345d4..9c0a5d2 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -23,6 +23,7 @@
   #:use-module (guix store)
   #:use-module (guix config)
   #:use-module (guix packages)
+  #:use-module (guix profiles)
   #:use-module (guix build-system)
   #:use-module (guix derivations)
   #:use-module ((guix build utils) #:select (mkdir-p))
@@ -229,6 +230,12 @@ interpreted."
                       (location->string loc)
                       (package-full-name package)
                       (build-system-name system))))
+            ((profile-error? c)
+             (leave (_ "profile '~a' does not exist~%")
+                    (profile-error-profile c)))
+            ((generation-error? c)
+             (leave (_ "generation '~a' does not exist~%")
+                    (generation-error-generation c)))
             ((nix-connection-error? c)
              (leave (_ "failed to connect to `~a': ~a~%")
                     (nix-connection-error-file c)
-- 
2.1.2