linux-boot: Add #:on-error for initrd error handling.

Suggested by Danny Milosavljevic <dannym@scratchpost.org>
in <https://bugs.gnu.org/29922>.

* gnu/build/linux-boot.scm (boot-system): Add #:on-error parameter and
pass it to 'call-with-error-handling'.
* gnu/system/linux-initrd.scm (raw-initrd): Add #:on-error and pass it.
(base-initrd): Likewise.

2 files changed, 23 insertions, 10 deletions

diff --git a/gnu/build/linux-boot.scm b/gnu/build/linux-boot.scm
index 4dd740174e..997107a67a 100644
--- a/gnu/build/linux-boot.scm
+++ b/gnu/build/linux-boot.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -430,7 +430,8 @@ bailing out.~%root contents: ~s~%" (scandir "/"))
                       qemu-guest-networking?
                       volatile-root?
                       pre-mount
-                      (mounts '()))
+                      (mounts '())
+                      (on-error 'debug))
   "This procedure is meant to be called from an initrd.  Boot a system by
 first loading LINUX-MODULES (a list of module names) from
 LINUX-MODULE-DIRECTORY, then setting up QEMU guest networking if
@@ -444,7 +445,10 @@ if any.
 MOUNTS must be a list of <file-system> objects.
 
 When VOLATILE-ROOT? is true, the root file system is writable but any changes
-to it are lost."
+to it are lost.
+
+ON-ERROR is passed to 'call-with-error-handling'; it determines what happens
+upon error."
   (define (root-mount-point? fs)
     (string=? (file-system-mount-point fs) "/"))
 
@@ -517,6 +521,7 @@ to it are lost."
            (begin
              (display "no boot file passed via '--load'\n")
              (display "entering a warm and cozy REPL\n")
-             (start-repl)))))))
+             (start-repl)))))
+   #:on-error on-error))
 
 ;;; linux-initrd.scm ends here
diff --git a/gnu/system/linux-initrd.scm b/gnu/system/linux-initrd.scm
index b592defa45..0f7f4721dd 100644
--- a/gnu/system/linux-initrd.scm
+++ b/gnu/system/linux-initrd.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2013, 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2013, 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 Mark H Weaver <mhw@netris.org>
 ;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
@@ -155,7 +155,8 @@ MODULES and taken from LINUX."
                       (mapped-devices '())
                       (helper-packages '())
                       qemu-networking?
-                      volatile-root?)
+                      volatile-root?
+                      (on-error 'debug))
   "Return a monadic derivation that builds a raw initrd, with kernel
 modules taken from LINUX.  FILE-SYSTEMS is a list of file-systems to be
 mounted by the initrd, possibly in addition to the root file system specified
@@ -167,8 +168,12 @@ e2fsck/static or other packages needed by the initrd to check root partition.
 
 When QEMU-NETWORKING? is true, set up networking with the standard QEMU
 parameters.
+
 When VOLATILE-ROOT? is true, the root file system is writable but any changes
-to it are lost."
+to it are lost.
+
+ON-ERROR is passed to 'call-with-error-handling'; it determines what happens
+upon error."
   (define device-mapping-commands
     ;; List of gexps to open the mapped devices.
     (map (lambda (md)
@@ -216,7 +221,8 @@ to it are lost."
                       #:linux-modules '#$linux-modules
                       #:linux-module-directory '#$kodir
                       #:qemu-guest-networking? #$qemu-networking?
-                      #:volatile-root? '#$volatile-root?)))
+                      #:volatile-root? '#$volatile-root?
+                      #:on-error '#$on-error)))
    #:name "raw-initrd"))
 
 (define* (file-system-packages file-systems #:key (volatile-root? #f))
@@ -243,7 +249,8 @@ FILE-SYSTEMS."
                       qemu-networking?
                       volatile-root?
                       (virtio? #t)
-                      (extra-modules '()))
+                      (extra-modules '())
+                      (on-error 'debug))
   "Return a monadic derivation that builds a generic initrd, with kernel
 modules taken from LINUX.  FILE-SYSTEMS is a list of file-systems to be
 mounted by the initrd, possibly in addition to the root file system specified
@@ -318,6 +325,7 @@ loaded at boot time in the order in which they appear."
               #:mapped-devices mapped-devices
               #:helper-packages helper-packages
               #:qemu-networking? qemu-networking?
-              #:volatile-root? volatile-root?))
+              #:volatile-root? volatile-root?
+              #:on-error on-error))
 
 ;;; linux-initrd.scm ends here