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-rw-r--r--guix/discovery.scm6
-rw-r--r--guix/ui.scm39
-rw-r--r--tests/guix-build.sh12
3 files changed, 50 insertions, 7 deletions
diff --git a/guix/discovery.scm b/guix/discovery.scm
index 86f20ec344..468b6c59de 100644
--- a/guix/discovery.scm
+++ b/guix/discovery.scm
@@ -106,14 +106,14 @@ name and the exception key and arguments."
(string-length directory))
(filter-map (lambda (file)
- (let* ((file (substring file prefix-len))
- (module (file-name->module-name file)))
+ (let* ((relative (string-drop file prefix-len))
+ (module (file-name->module-name relative)))
(catch #t
(lambda ()
(resolve-interface module))
(lambda args
;; Report the error, but keep going.
- (warn module args)
+ (warn file module args)
#f))))
(scheme-files (if sub-directory
(string-append directory "/" sub-directory)
diff --git a/guix/ui.scm b/guix/ui.scm
index 76f6fc8eed..1812b01272 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -311,6 +311,36 @@ arguments."
(display-hint (format #f (G_ "Did you forget @code{(use-modules ~a)}?")
(module-name module))))))))
+(define (check-module-matches-file module file)
+ "Check whether FILE starts with 'define-module MODULE' and print a hint if
+it doesn't."
+ ;; This is a common mistake when people start writing their own package
+ ;; definitions and try loading them with 'guix build -L …', so help them
+ ;; diagnose the problem.
+ (define (hint)
+ (display-hint (format #f (G_ "File @file{~a} should probably start with:
+
+@example\n(define-module ~a)\n@end example")
+ file module)))
+
+ (catch 'system-error
+ (lambda ()
+ (let* ((sexp (call-with-input-file file read))
+ (loc (and (pair? sexp)
+ (source-properties->location (source-properties sexp)))))
+ (match sexp
+ (('define-module (names ...) _ ...)
+ (unless (equal? module names)
+ (warning loc
+ (G_ "module name ~a does not match file name '~a'~%")
+ names (module->source-file-name module))
+ (hint)))
+ ((? eof-object?)
+ (warning (G_ "~a: file is empty~%") file))
+ (else
+ (hint)))))
+ (const #f)))
+
(define* (report-load-error file args #:optional frame)
"Report the failure to load FILE, a user-provided Scheme file.
ARGS is the list of arguments received by the 'throw' handler."
@@ -352,13 +382,13 @@ ARGS is the list of arguments received by the 'throw' handler."
;; above and need to be printed with 'print-exception'.
(print-exception (current-error-port) frame key args))))))
-(define (warn-about-load-error file args) ;FIXME: factorize with ↑
+(define (warn-about-load-error file module args) ;FIXME: factorize with ↑
"Report the failure to load FILE, a user-provided Scheme file, without
exiting. ARGS is the list of arguments received by the 'throw' handler."
(match args
(('system-error . rest)
(let ((err (system-error-errno args)))
- (warning (G_ "failed to load '~a': ~a~%") file (strerror err))))
+ (warning (G_ "failed to load '~a': ~a~%") module (strerror err))))
(('syntax-error proc message properties form . rest)
(let ((loc (source-properties->location properties)))
(warning loc (G_ "~a~%") message)))
@@ -370,8 +400,9 @@ exiting. ARGS is the list of arguments received by the 'throw' handler."
(warning (G_ "failed to load '~a': exception thrown: ~s~%")
file obj)))
((error args ...)
- (warning (G_ "failed to load '~a':~%") file)
- (apply display-error #f (current-error-port) args))))
+ (warning (G_ "failed to load '~a':~%") module)
+ (apply display-error #f (current-error-port) args)
+ (check-module-matches-file module file))))
(define (call-with-unbound-variable-handling thunk)
(define tag
diff --git a/tests/guix-build.sh b/tests/guix-build.sh
index 63a9fe68da..d16b92d189 100644
--- a/tests/guix-build.sh
+++ b/tests/guix-build.sh
@@ -164,6 +164,17 @@ grep "unbound" "$module_dir/err" # actual error
grep "forget.*(gnu packages base)" "$module_dir/err" # hint
rm -f "$module_dir"/*
+# Wrong 'define-module' clause reported by 'warn-about-load-error'.
+cat > "$module_dir/foo.scm" <<EOF
+(define-module (something foo)
+ #:use-module (guix)
+ #:use-module (gnu))
+EOF
+guix build guile-bootstrap -n 2> "$module_dir/err"
+grep "does not match file name" "$module_dir/err"
+
+rm "$module_dir"/*
+
# Should all return valid log files.
drv="`guix build -d -e '(@@ (gnu packages bootstrap) %bootstrap-guile)'`"
out="`guix build -e '(@@ (gnu packages bootstrap) %bootstrap-guile)'`"
@@ -265,6 +276,7 @@ cat > "$module_dir/gexp.scm"<<EOF
EOF
guix build --file="$module_dir/gexp.scm" -d
guix build --file="$module_dir/gexp.scm" -d | grep 'gexp\.drv'
+rm "$module_dir"/*.scm
# Using 'GUIX_BUILD_OPTIONS'.
GUIX_BUILD_OPTIONS="--dry-run --no-grafts"