From: Alex Kost <alezost@gmail.com>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: guix-devel@gnu.org
Subject: [PATCH] guix package: Export generation procedures.
Date: Sat, 04 Oct 2014 21:59:06 +0400 [thread overview]
Message-ID: <87wq8fk979.fsf_-_@gmail.com> (raw)
In-Reply-To: <87ppfs6gxk.fsf@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\= \=\?utf-8\?Q\?s\?\= message of "Fri, 22 Aug 2014 10:56:39 +0200")
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Ludovic Courtès (2014-08-22 12:56 +0400) wrote:
> Alex Kost <alezost@gmail.com> skribis:
>
>> Also I would like to add support for deleting generations (to
>> "guix.el"), so I think it would be good to export ‘delete-generation’
>> from "scripts/package.scm". WDYT?
>
> Yes, that makes sense, one could use it from the *Guix Generation List*
> buffer.
What about the attached patch? Some comments and questions:
- I added 'store' argument to the exported procedures, however it is
used only in one particular case: when we need to create an empty
profile (i.e. to call ‘link-to-empty-profile’). Is there a way to
avoid using 'store' argument there or is it fine to leave it like
this?
- I actually need only ‘delete-generations’ procedure for Emacs UI, but
I think other procedures are also worth to be exported or not?
- Perhaps there is a better place for those functions than
(guix scripts package)?
- (Not related to this patch, but still …) Currently with “roll-back”,
we can only switch to the previous generation. What about adding a
possibility to switch to any generation? So that we could use
something like this:
guix package --switch-generation=7
Also such functionality can be added to Emacs UI: for example pressing
"C" on a generation in *Guix Generation List* will make this
generation the current one.
So ‘roll-back’ procedure may become a special case of the
‘switch-generation’ one. WDYT?
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From c50d1674d3be699198afb649a2a9932ca44c89bc Mon Sep 17 00:00:00 2001
From: Alex Kost <alezost@gmail.com>
Date: Sat, 4 Oct 2014 20:45:35 +0400
Subject: [PATCH] guix package: Export generation procedures.
* guix/scripts/package.scm: Export 'roll-back', 'delete-generation',
'delete-generations'.
(link-to-empty-profile, roll-back): Add 'store' argument.
(delete-generations): New procedure.
(guix-package): Adjust accordingly.
[delete-generation]: Move to the top level. Add 'store' and 'profile'
arguments.
[display-and-delete]: Move to 'delete-generation'.
---
guix/scripts/package.scm | 75 +++++++++++++++++++++++++++---------------------
1 file changed, 43 insertions(+), 32 deletions(-)
diff --git a/guix/scripts/package.scm b/guix/scripts/package.scm
index 7cd9516..fc9c37b 100644
--- a/guix/scripts/package.scm
+++ b/guix/scripts/package.scm
@@ -2,6 +2,7 @@
;;; Copyright © 2012, 2013, 2014 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2013 Nikita Karetnikov <nikita@karetnikov.org>
;;; Copyright © 2013 Mark H Weaver <mhw@netris.org>
+;;; Copyright © 2014 Alex Kost <alezost@gmail.com>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -43,6 +44,9 @@
#:use-module (gnu packages guile)
#:use-module ((gnu packages bootstrap) #:select (%bootstrap-guile))
#:export (specification->package+output
+ roll-back
+ delete-generation
+ delete-generations
guix-package))
(define %store
@@ -80,12 +84,12 @@ return PROFILE unchanged. The goal is to treat '-p ~/.guix-profile' as if
%current-profile
profile))
-(define (link-to-empty-profile generation)
+(define (link-to-empty-profile store generation)
"Link GENERATION, a string, to the empty profile."
- (let* ((drv (run-with-store (%store)
+ (let* ((drv (run-with-store store
(profile-derivation (manifest '()))))
(prof (derivation->output-path drv "out")))
- (when (not (build-derivations (%store) (list drv)))
+ (when (not (build-derivations store (list drv)))
(leave (_ "failed to build the empty profile~%")))
(switch-symlinks generation prof)))
@@ -99,7 +103,7 @@ return PROFILE unchanged. The goal is to treat '-p ~/.guix-profile' as if
number previous-number)
(switch-symlinks profile previous-generation)))
-(define (roll-back profile)
+(define (roll-back store profile)
"Roll back to the previous generation of PROFILE."
(let* ((number (generation-number profile))
(previous-number (previous-generation-number profile number))
@@ -112,11 +116,39 @@ return PROFILE unchanged. The goal is to treat '-p ~/.guix-profile' as if
(_ "nothing to do: already at the empty profile~%")))
((or (zero? previous-number) ; going to emptiness
(not (file-exists? previous-generation)))
- (link-to-empty-profile previous-generation)
+ (link-to-empty-profile store previous-generation)
(switch-to-previous-generation profile))
(else
(switch-to-previous-generation profile))))) ; anything else
+(define (delete-generation store profile number)
+ "Delete generation with NUMBER from PROFILE."
+ (define (display-and-delete)
+ (let ((generation (generation-file-name profile number)))
+ (format #t (_ "deleting ~a~%") generation)
+ (delete-file generation)))
+
+ (let* ((current-number (generation-number profile))
+ (previous-number (previous-generation-number profile number))
+ (previous-generation (generation-file-name profile previous-number)))
+ (cond ((zero? number)) ; do not delete generation 0
+ ((and (= number current-number)
+ (not (file-exists? previous-generation)))
+ (link-to-empty-profile store previous-generation)
+ (switch-to-previous-generation profile)
+ (display-and-delete))
+ ((= number current-number)
+ (roll-back store profile)
+ (display-and-delete))
+ (else
+ (display-and-delete)))))
+
+(define (delete-generations store profile generations)
+ "Delete GENERATIONS from PROFILE.
+GENERATIONS is a list of generation numbers."
+ (for-each (cut delete-generation store profile <>)
+ generations))
+
(define* (matching-generations str #:optional (profile %current-profile)
#:key (duration-relation <=))
"Return the list of available generations matching a pattern in STR. See
@@ -680,32 +712,10 @@ more information.~%"))
(define current-generation-number
(generation-number profile))
- (define (display-and-delete number)
- (let ((generation (generation-file-name profile number)))
- (unless (zero? number)
- (format #t (_ "deleting ~a~%") generation)
- (delete-file generation))))
-
- (define (delete-generation number)
- (let* ((previous-number (previous-generation-number profile number))
- (previous-generation
- (generation-file-name profile previous-number)))
- (cond ((zero? number)) ; do not delete generation 0
- ((and (= number current-generation-number)
- (not (file-exists? previous-generation)))
- (link-to-empty-profile previous-generation)
- (switch-to-previous-generation profile)
- (display-and-delete number))
- ((= number current-generation-number)
- (roll-back profile)
- (display-and-delete number))
- (else
- (display-and-delete number)))))
-
;; First roll back if asked to.
(cond ((and (assoc-ref opts 'roll-back?) (not dry-run?))
(begin
- (roll-back profile)
+ (roll-back (%store) profile)
(process-actions (alist-delete 'roll-back? opts))))
((and (assoc-ref opts 'delete-generations)
(not dry-run?))
@@ -716,9 +726,10 @@ more information.~%"))
(leave (_ "profile '~a' does not exist~%")
profile))
((string-null? pattern)
- (for-each display-and-delete
- (delete current-generation-number
- (profile-generations profile))))
+ (delete-generations
+ (%store) profile
+ (delete current-generation-number
+ (profile-generations profile))))
;; Do not delete the zeroth generation.
((equal? 0 (string->number pattern))
(exit 0))
@@ -731,7 +742,7 @@ more information.~%"))
(lambda (numbers)
(if (null-list? numbers)
(exit 1)
- (for-each delete-generation numbers))))
+ (delete-generations (%store) profile numbers))))
(else
(leave (_ "invalid syntax: ~a~%")
pattern)))
--
2.1.2
next prev parent reply other threads:[~2014-10-04 17:59 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-25 17:58 Emacs interface for Guix Alex Kost
2014-07-25 20:36 ` Ludovic Courtès
2014-07-26 17:44 ` Alex Kost
2014-07-28 10:15 ` Alex Kost
2014-08-11 20:54 ` Ludovic Courtès
2014-08-12 10:19 ` [PATCH] " Alex Kost
2014-08-12 14:19 ` Ludovic Courtès
2014-08-12 16:20 ` Alex Kost
2014-08-12 19:50 ` Ludovic Courtès
2014-08-13 6:57 ` Alex Kost
2014-08-13 16:03 ` Ludovic Courtès
2014-08-13 20:58 ` Alex Kost
2014-08-15 5:51 ` Alex Kost
2014-08-16 9:27 ` Ludovic Courtès
2014-08-16 10:52 ` [PATCH] manifest-transaction Alex Kost
2014-08-20 12:10 ` [PATCH] profiles: Report about upgrades Alex Kost
2014-08-23 11:58 ` Ludovic Courtès
2014-08-30 19:56 ` Ludovic Courtès
2014-08-31 6:04 ` Alex Kost
2014-08-31 19:57 ` Ludovic Courtès
2014-08-31 22:54 ` Jason Self
2014-09-01 7:13 ` Alex Kost
2014-09-02 19:45 ` Ludovic Courtès
[not found] ` <87egvrke1z.fsf@gmail.com>
2014-09-04 19:37 ` Ludovic Courtès
2014-08-16 12:24 ` [PATCH] Emacs interface for Guix Ludovic Courtès
2014-08-16 13:07 ` Alex Kost
2014-08-19 21:00 ` Ludovic Courtès
2014-08-20 10:54 ` Alex Kost
2014-08-22 8:56 ` Ludovic Courtès
2014-08-22 12:44 ` Alex Kost
2014-08-27 8:34 ` Ludovic Courtès
2014-10-04 17:59 ` Alex Kost [this message]
2014-10-04 20:23 ` [PATCH] guix package: Export generation procedures Ludovic Courtès
2014-10-05 8:54 ` [PATCH] emacs: Add support for deleting generations Alex Kost
2014-10-05 13:14 ` Ludovic Courtès
2014-10-05 18:23 ` Alex Kost
2014-10-05 19:20 ` Ludovic Courtès
2014-10-05 20:04 ` Alex Kost
2014-10-06 7:36 ` Ludovic Courtès
2014-10-06 14:14 ` [PATCH] guix package: Add '--switch-generation' option Alex Kost
2014-10-06 19:27 ` Ludovic Courtès
2014-10-07 10:04 ` Alex Kost
2014-10-07 16:00 ` Ludovic Courtès
2014-10-07 21:32 ` Alex Kost
2014-10-08 9:44 ` Ludovic Courtès
2014-10-05 14:44 ` [PATCH] guix package: Export generation procedures Andreas Enge
2014-10-05 19:21 ` Ludovic Courtès
2014-07-26 20:58 ` Emacs interface for Guix Ludovic Courtès
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