installer: Use named prompt to abort or break installer steps.

* gnu/installer/steps.scm (run-installer-steps): Set up
'installer-step prompt.
* gnu/installer/newt/ethernet.scm (run-ethernet-page)
* gnu/installer/newt/final.scm (run-config-display-page,
run-install-failed-page)
* gnu/installer/newt/keymap.scm (run-layout-page, run-variant-page)
* gnu/installer/newt/locale.scm (run-language-page,
run-territory-page, run-codeset-page, run-modifier-page,
run-locale-page)
* gnu/installer/newt/network.scm (run-technology-page,
wait-service-online)
* gnu/installer/newt/page.scm (run-listbox-selection-page,
run-checkbox-tree-page)
* gnu/installer/newt/partition.scm (button-exit-action)
* gnu/installer/newt/services.scm (run-desktop-environments-cbt-page,
run-networking-cbt-page, run-other-services-cbt-page,
run-network-management-page)
* gnu/installer/newt/timezone.scm (run-timezone-page)
* gnu/installer/newt/user.scm (run-user-page)
* gnu/installer/newt/welcome.scm (run-menu-page)
* gnu/installer/newt/wifi.scm (run-wifi-page): Use the 'installer-step
prompt to abort.

Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>

1 files changed, 4 insertions, 12 deletions

diff --git a/gnu/installer/newt/network.scm b/gnu/installer/newt/network.scm
index fb221483c3..0477a489be 100644
--- a/gnu/installer/newt/network.scm
+++ b/gnu/installer/newt/network.scm
@@ -65,12 +65,8 @@ Internet and return the selected technology. For now, only technologies with
             (G_ "Exit")
             (G_ "The install process requires Internet access but no \
 network devices were found. Do you want to continue anyway?"))
-       ((1) (raise
-             (condition
-              (&installer-step-break))))
-       ((2) (raise
-             (condition
-              (&installer-step-abort))))))
+       ((1) (abort-to-prompt 'installer-step 'break))
+       ((2) (abort-to-prompt 'installer-step 'abort))))
     ((technology)
      ;; Since there's only one technology available, skip the selection
      ;; screen.
@@ -86,9 +82,7 @@ network devices were found. Do you want to continue anyway?"))
       #:button-text (G_ "Exit")
       #:button-callback-procedure
       (lambda _
-        (raise
-         (condition
-          (&installer-step-abort))))))))
+        (abort-to-prompt 'installer-step 'abort))))))
 
 (define (find-technology-by-type technologies type)
   "Find and return a technology with the given TYPE in TECHNOLOGIES list."
@@ -156,9 +150,7 @@ FULL-VALUE tentatives, spaced by 1 second."
        (G_ "The selected network does not provide access to the \
 Internet and the Guix substitute server, please try again.")
        (G_ "Connection error"))
-      (raise
-       (condition
-        (&installer-step-abort))))))
+      (abort-to-prompt 'installer-step 'abort))))
 
 (define (run-network-page)
   "Run a page to allow the user to configure connman so that it can access the