diff options
| -rw-r--r-- | guix/scripts/build.scm | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/guix/scripts/build.scm b/guix/scripts/build.scm index f238e9b876..476e556618 100644 --- a/guix/scripts/build.scm +++ b/guix/scripts/build.scm @@ -38,6 +38,7 @@ #:use-module (guix monads) #:use-module (guix gexp) #:use-module (guix profiles) + #:use-module (guix diagnostics) #:autoload (guix http-client) (http-fetch http-get-error?) #:use-module (ice-9 format) #:use-module (ice-9 match) @@ -46,6 +47,7 @@ #:use-module (srfi srfi-11) #:use-module (srfi srfi-26) #:use-module (srfi srfi-34) + #:use-module (srfi srfi-35) #:use-module (srfi srfi-37) #:use-module (gnu packages) #:autoload (guix download) (download-to-store) @@ -830,7 +832,28 @@ must be one of 'package', 'all', or 'transitive'~%") build---packages, gexps, derivations, and so on." (define (validate-type x) (unless (or (derivation? x) (file-like? x) (gexp? x) (procedure? x)) - (leave (G_ "~s: not something we can build~%") x))) + (raise (make-compound-condition + (formatted-message (G_ "~s: not something we can build~%") x) + (condition + (&fix-hint + (hint + (if (unspecified? x) + (G_ "If you build from a file, make sure the last Scheme +expression returns a package value. @code{define-public} defines a variable, +but returns @code{#<unspecified>}. To fix this, add a Scheme expression at +the end of the file that consists only of the package's variable name you +defined, as in this example: + +@example +(define-public my-package + (package + ...)) + +my-package +@end example") + (G_ "If you build from a file, make sure the last +Scheme expression returns a package, gexp, derivation or a list of such +values."))))))))) (define (ensure-list x) (let ((lst (match x |