[bug#58624] [PATCH] guix gc: Add '--vacuum-store'.

[Efraim Flashner <efraim@flashner.co.il>]

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On Thu, Oct 20, 2022 at 08:51:04PM +0200, Liliana Marie Prikler wrote:
> Am Mittwoch, dem 19.10.2022 um 12:26 +0300 schrieb Efraim Flashner:
> > * guix/scripts/gc.scm (show-help, %options): Add '--vacuum-store'.
> > * guix/store/database.scm (vacuum-database): New procedure.
> > * doc/guix.texi (Invoking guix gc): Document the option.
> > ---
> >  doc/guix.texi           | 11 +++++++++++
> >  guix/scripts/gc.scm     | 11 +++++++++++
> >  guix/store/database.scm |  9 ++++++++-
> >  3 files changed, 30 insertions(+), 1 deletion(-)
> > 
> > diff --git a/doc/guix.texi b/doc/guix.texi
> > index 3bf2dee752..89fd04415a 100644
> > --- a/doc/guix.texi
> > +++ b/doc/guix.texi
> > @@ -4531,6 +4531,17 @@ Invoking guix gc
> >  this option is primarily useful when the daemon was running with
> >  @option{--disable-deduplication}.
> >  
> > +@item --vacuum-store
> > +@cindex vacuum the store database
> > +@comment Avoid words like 'repair,' 'compress,' and 'optimize.'
> > +Guix uses an sqlite database to keep track of the items in
> > (@pxref{The Store}).
> > +Overtime it is possible that the database may grow to a large size
> > and become
> > +fragmented.  As a result, one may wish to clear the freed space and
> > join the
> > +partially used pages in the database left behind from removed
> > packages or after
> > +running the garbage collector.  Running @command{sudo guix gc --
> > vacuum-store}
> > +will lock the database and @code{VACUUM} the store, defragmenting
> > the database
> > +and purging freed pages, unlocking the database when it finishes..
> You're using vacuum-store here...
> 
> >  @end table
> >  
> >  @node Invoking guix pull
> > diff --git a/guix/scripts/gc.scm b/guix/scripts/gc.scm
> > index 65cd4bdf8b..5e775c5cdb 100644
> > --- a/guix/scripts/gc.scm
> > +++ b/guix/scripts/gc.scm
> > @@ -1,5 +1,6 @@
> >  ;;; GNU Guix --- Functional package management for GNU
> >  ;;; Copyright © 2012-2013, 2015-2020, 2022 Ludovic Courtès
> > <ludo@gnu.org>
> > +;;; Copyright © 2022 Efraim Flashner <efraim@flashner.co.il>
> >  ;;;
> >  ;;; This file is part of GNU Guix.
> >  ;;;
> > @@ -27,6 +28,7 @@ (define-module (guix scripts gc)
> >                                  generation-number)
> >    #:autoload   (guix scripts package) (delete-generations)
> >    #:autoload   (gnu home) (home-generation-base)
> > +  #:autoload   (guix store database) (vacuum-database)
> >    #:use-module (ice-9 match)
> >    #:use-module (ice-9 regex)
> >    #:use-module (srfi srfi-1)
> > @@ -86,6 +88,10 @@ (define (show-help)
> >    (display (G_ "
> >        --clear-failures   remove PATHS from the set of cached
> > failures"))
> >    (newline)
> > +  (display (G_ "
> > +      --vacuum-database  repack the sqlite database tracking the
> > store
> > +                         using less space"))
> > +  (newline)
> >    (display (G_ "
> >    -h, --help             display this help and exit"))
> >    (display (G_ "
> > @@ -131,6 +137,11 @@ (define %options
> >                  (lambda args
> >                    (show-version-and-exit "guix gc")))
> >  
> > +        (option '("vacuum-database") #f #f
> > +                (lambda args
> > +                  (vacuum-database)
> > +                  (exit 0)))
> > +
> >          (option '(#\C "collect-garbage") #f #t
> >                  (lambda (opt name arg result)
> >                    (let ((result (alist-cons 'action 'collect-garbage
> > diff --git a/guix/store/database.scm b/guix/store/database.scm
> > index 8d08def833..e664015673 100644
> > --- a/guix/store/database.scm
> > +++ b/guix/store/database.scm
> > @@ -2,6 +2,7 @@
> >  ;;; Copyright © 2017, 2019 Caleb Ristvedt <caleb.ristvedt@cune.org>
> >  ;;; Copyright © 2018, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
> >  ;;; Copyright © 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
> > +;;; Copyright © 2022 Efraim Flashner <efraim@flashner.co.il>
> >  ;;;
> >  ;;; This file is part of GNU Guix.
> >  ;;;
> > @@ -45,7 +46,8 @@ (define-module (guix store database)
> >              sqlite-register
> >              register-items
> >              %epoch
> > -            reset-timestamps))
> > +            reset-timestamps
> > +            vacuum-database))
> >  
> >  ;;; Code for working with the store database directly.
> >  
> > @@ -438,3 +440,8 @@ (define* (register-items db items
> >                      (register db item)
> >                      (report))
> >                    items)))))
> > +
> > +(define (vacuum-database)
> > +  (let ((db (sqlite-open (store-database-file))))
> > +    (sqlite-exec db "VACUUM;")
> > +    (sqlite-close db)))
> ... but vacuum-database here.
> 
> Since the database is just a part of the store, I think making it
> "vacuum-database" everywhere ought to make it both more consistent and
> more correct.

Agreed. I even made sure it was --vacuum-database in the help menu from
'guix gc --help'. Truth is I wrote the code and then the next day I
wrote the documentation, so figures I would document it wrong ...

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Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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