diff options
Diffstat (limited to 'guix/scripts/time-machine.scm')
| -rw-r--r-- | guix/scripts/time-machine.scm | 91 |
1 files changed, 44 insertions, 47 deletions
diff --git a/guix/scripts/time-machine.scm b/guix/scripts/time-machine.scm index f31fae7435..2c30fe7cfd 100644 --- a/guix/scripts/time-machine.scm +++ b/guix/scripts/time-machine.scm @@ -46,12 +46,6 @@ #:use-module (srfi srfi-71) #:export (guix-time-machine)) -;;; The required inferiors mechanism relied on by 'guix time-machine' was -;;; firmed up in v1.0.0; it is the oldest, safest commit that can be travelled -;;; to. -(define %oldest-possible-commit - "6298c3ffd9654d3231a6f25390b056483e8f407c") ;v1.0.0 - ;;; ;;; Command-line options. @@ -146,6 +140,31 @@ Execute COMMAND ARGS... in an older version of Guix.\n")) ;;; +;;; Avoiding traveling too far back. +;;; + +;;; The required inferiors mechanism relied on by 'guix time-machine' was +;;; firmed up in v1.0.0; it is the oldest, safest commit that can be travelled +;;; to. +(define %oldest-possible-commit + "6298c3ffd9654d3231a6f25390b056483e8f407c") ;v1.0.0 + +(define %reference-channels + (list (channel (inherit %default-guix-channel) + (commit %oldest-possible-commit)))) + +(define (validate-guix-channel channel start commit relation) + "Raise an error if CHANNEL is the 'guix' channel and the RELATION of COMMIT +to %OLDEST-POSSIBLE-COMMIT is not that of an ancestor." + (unless (or (not (guix-channel? channel)) + (memq relation '(ancestor self))) + (raise (formatted-message + (G_ "cannot travel past commit `~a' from May 1st, 2019") + (string-take %oldest-possible-commit 12))))) + + + +;;; ;;; Entry point. ;;; @@ -160,44 +179,22 @@ Execute COMMAND ARGS... in an older version of Guix.\n")) (ref (assoc-ref opts 'ref)) (substitutes? (assoc-ref opts 'substitutes?)) (authenticate? (assoc-ref opts 'authenticate-channels?))) - - (define (validate-guix-channel channels) - "Finds the Guix channel among CHANNELS, and validates that REF as -captured from the closure, a git reference specification such as a commit hash -or tag associated to the channel, is valid and new enough to satisfy the 'guix -time-machine' requirements. If the captured REF variable is #f, the reference -validate is the one of the Guix channel found in CHANNELS. A -`formatted-message' condition is raised otherwise." - (let* ((guix-channel (find guix-channel? channels)) - (guix-channel-commit (channel-commit guix-channel)) - (guix-channel-branch (channel-branch guix-channel)) - (guix-channel-ref (if guix-channel-commit - `(tag-or-commit . ,guix-channel-commit) - `(branch . ,guix-channel-branch))) - (reference (or ref guix-channel-ref)) - (checkout commit relation (update-cached-checkout - (channel-url guix-channel) - #:ref reference - #:starting-commit - %oldest-possible-commit))) - (unless (memq relation '(ancestor self)) - (raise (formatted-message - (G_ "cannot travel past commit `~a' from May 1st, 2019") - (string-take %oldest-possible-commit 12)))))) - - (when command-line - (let* ((directory - (with-store store - (with-status-verbosity (assoc-ref opts 'verbosity) - (with-build-handler (build-notifier #:use-substitutes? - substitutes? - #:verbosity - (assoc-ref opts 'verbosity) - #:dry-run? #f) - (set-build-options-from-command-line store opts) - (cached-channel-instance store channels - #:authenticate? authenticate? - #:validate-channels - validate-guix-channel))))) - (executable (string-append directory "/bin/guix"))) - (apply execl (cons* executable executable command-line)))))))) + (if command-line + (let* ((directory + (with-store store + (with-status-verbosity (assoc-ref opts 'verbosity) + (with-build-handler (build-notifier #:use-substitutes? + substitutes? + #:verbosity + (assoc-ref opts 'verbosity) + #:dry-run? #f) + (set-build-options-from-command-line store opts) + (cached-channel-instance store channels + #:authenticate? authenticate? + #:reference-channels + %reference-channels + #:validate-channels + validate-guix-channel))))) + (executable (string-append directory "/bin/guix"))) + (apply execl (cons* executable executable command-line))) + (warning (G_ "no command specified; nothing to do~%"))))))) |