guix gc: Add '--delete-generations'.

* guix/scripts/gc.scm (show-help, %options): Add
'--delete-generations'.  Change '--delete' shorthand to '-D'.
(delete-old-generations): New procedure.
(guix-gc)[delete-generations]: New procedure.
Call it when ACTION is 'collect-garbage' and OPTS contains
'delete-generations.
* doc/guix.texi (Invoking guix gc): Document it.
This commit is contained in:
Ludovic Courtès 2019-04-06 23:14:19 +02:00
parent c872b952c5
commit 96b8c2e6e2
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2 changed files with 59 additions and 3 deletions

View file

@ -3438,8 +3438,22 @@ as @code{500MiB}, as described above.
When @var{free} or more is already available in @file{/gnu/store}, do
nothing and exit immediately.
@item --delete-generations[=@var{duration}]
@itemx -d [@var{duration}]
Before starting the garbage collection process, delete all the generations
older than @var{duration}, for all the user profiles; when run as root, this
applies to all the profiles @emph{of all the users}.
For example, this command deletes all the generations of all your profiles
that are older than 2 months (except generations that are current), and then
proceeds to free space until at least 10 GiB are available:
@example
guix gc -d 2m -F 10G
@end example
@item --delete
@itemx -d
@itemx -D
Attempt to delete all the store files and directories specified as
arguments. This fails if some of the files are not in the store, or if
they are still live.

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@ -22,6 +22,8 @@ (define-module (guix scripts gc)
#:use-module (guix store)
#:use-module (guix store roots)
#:autoload (guix build syscalls) (free-disk-space)
#:autoload (guix profiles) (generation-profile)
#:autoload (guix scripts package) (delete-generations)
#:use-module (ice-9 match)
#:use-module (ice-9 regex)
#:use-module (srfi srfi-1)
@ -48,7 +50,10 @@ (define (show-help)
(display (G_ "
-F, --free-space=FREE attempt to reach FREE available space in the store"))
(display (G_ "
-d, --delete attempt to delete PATHS"))
-d, --delete-generations[=PATTERN]
delete profile generations matching PATTERN"))
(display (G_ "
-D, --delete attempt to delete PATHS"))
(display (G_ "
--list-roots list the user's garbage collector roots"))
(display (G_ "
@ -98,6 +103,16 @@ (define argument->verify-options
lst)
'()))))
(define (delete-old-generations store profile pattern)
"Remove the generations of PROFILE that match PATTERN, a duration pattern.
Do nothing if none matches."
(let* ((current (generation-number profile))
(numbers (matching-generations pattern profile
#:duration-relation >)))
;; Make sure we don't inadvertently remove the current generation.
(delete-generations store profile (delv current numbers))))
(define %options
;; Specification of the command-line options.
(list (option '(#\h "help") #f #f
@ -123,10 +138,25 @@ (define %options
(option '(#\F "free-space") #t #f
(lambda (opt name arg result)
(alist-cons 'free-space (size->number arg) result)))
(option '(#\d "delete") #f #f
(option '(#\D "delete") #f #f ;used to be '-d' (lower case)
(lambda (opt name arg result)
(alist-cons 'action 'delete
(alist-delete 'action result))))
(option '(#\d "delete-generations") #f #t
(lambda (opt name arg result)
(if (and arg (store-path? arg))
(begin
(warning (G_ "'-d' as an alias for '--delete' \
is deprecated; use '-D'~%"))
`((action . delete)
(argument . ,arg)
(alist-delete 'action result)))
(begin
(when (and arg (not (string->duration arg)))
(leave (G_ "~s does not denote a duration~%")
arg))
(alist-cons 'delete-generations (or arg "")
result)))))
(option '("optimize") #f #f
(lambda (opt name arg result)
(alist-cons 'action 'optimize
@ -212,6 +242,14 @@ (define (ensure-free-space store space)
(info (G_ "freeing ~h MiBs~%") (/ to-free 1024. 1024.))
(collect-garbage store to-free)))))
(define (delete-generations store pattern)
;; Delete the generations matching PATTERN of all the user's profiles.
(let ((profiles (delete-duplicates
(filter-map generation-profile (gc-roots)))))
(for-each (lambda (profile)
(delete-old-generations store profile pattern))
profiles)))
(define (list-roots)
;; List all the user-owned GC roots.
(let ((roots (filter (if (zero? (getuid)) (const #t) user-owned?)
@ -245,6 +283,10 @@ (define (list-relatives relatives)
(assert-no-extra-arguments)
(let ((min-freed (assoc-ref opts 'min-freed))
(free-space (assoc-ref opts 'free-space)))
(match (assoc-ref opts 'delete-generations)
(#f #t)
((? string? pattern)
(delete-generations store pattern)))
(cond
(free-space
(ensure-free-space store free-space))