diff options
Diffstat (limited to 'guix/ui.scm')
| -rw-r--r-- | guix/ui.scm | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/guix/ui.scm b/guix/ui.scm index 9c27dd8b3a..2b75504573 100644 --- a/guix/ui.scm +++ b/guix/ui.scm @@ -22,17 +22,20 @@ #:use-module (guix store) #:use-module (guix config) #:use-module (guix packages) + #:use-module (guix derivations) #:use-module ((guix licenses) #:select (license? license-name)) #:use-module (srfi srfi-1) #:use-module (srfi srfi-11) #:use-module (srfi srfi-26) #:use-module (srfi srfi-34) #:use-module (ice-9 match) + #:use-module (ice-9 format) #:export (_ N_ leave show-version-and-exit show-bug-report-information + show-what-to-build call-with-error-handling with-error-handling location->string @@ -112,6 +115,32 @@ General help using GNU software: <http://www.gnu.org/gethelp/>")) (nix-protocol-error-message c)))) (thunk))) +(define* (show-what-to-build store drv #:optional dry-run?) + "Show what will or would (depending on DRY-RUN?) be built in realizing the +derivations listed in DRV." + (let* ((req (append-map (lambda (drv-path) + (let ((d (call-with-input-file drv-path + read-derivation))) + (derivation-prerequisites-to-build + store d))) + drv)) + (req* (delete-duplicates + (append (remove (compose (cute valid-path? store <>) + derivation-path->output-path) + drv) + (map derivation-input-path req))))) + (if dry-run? + (format (current-error-port) + (N_ "~:[the following derivation would be built:~%~{ ~a~%~}~;~]" + "~:[the following derivations would be built:~%~{ ~a~%~}~;~]" + (length req*)) + (null? req*) req*) + (format (current-error-port) + (N_ "~:[the following derivation will be built:~%~{ ~a~%~}~;~]" + "~:[the following derivations will be built:~%~{ ~a~%~}~;~]" + (length req*)) + (null? req*) req*)))) + (define-syntax with-error-handling (syntax-rules () "Run BODY within a user-friendly error condition handler." |