From 7ee74cc1d31c4d3e7bc8d8d65222fca96cc3a7ab Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Thu, 16 May 2019 09:35:42 +0200
Subject: check-kernel.conf and reboot_check_hook() new

---
 .gitignore           |  1 +
 Makefile             |  3 ++-
 check-kernel.conf.in |  8 ++++++++
 check-kernel.in      | 12 ++++++++++++
 4 files changed, 23 insertions(+), 1 deletion(-)
 create mode 100644 check-kernel.conf.in

diff --git a/.gitignore b/.gitignore
index 31f83a4..769d934 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 check-kernel
+check-kernel.conf
 man.commons
 *.common
 *.1
diff --git a/Makefile b/Makefile
index 151cf87..5fb707e 100644
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ MANDIR	 = /usr/share/man
 
 VERSION  = 0.5
 
-all: man.commons check-kernel check-kernel.1
+all: man.commons check-kernel check-kernel.conf check-kernel.1
 
 %: %.in
 	sed " \
@@ -47,6 +47,7 @@ all: man.commons check-kernel check-kernel.1
 
 install: all
 	install -D -m0755 check-kernel $(DESTDIR)$(BINDIR)/check-kernel
+	install -D -m0644 check-kernel.conf $(DESTDIR)$(ETCDIR)/check-kernel.conf
 	install -D -m0644 check-kernel.1 $(DESTDIR)$(MANDIR)/man1/check-kernel.1
 
 clean:
diff --git a/check-kernel.conf.in b/check-kernel.conf.in
new file mode 100644
index 0000000..dc40a52
--- /dev/null
+++ b/check-kernel.conf.in
@@ -0,0 +1,8 @@
+# Configuration for check-kernel
+# Should be located at #ETCDIR#/check-kernel.conf
+
+# a hook which should check if a reboot is safe and wait or return
+# non-zero if it is not
+reboot_check_hook() {
+  true
+}
diff --git a/check-kernel.in b/check-kernel.in
index c138152..d9c3717 100644
--- a/check-kernel.in
+++ b/check-kernel.in
@@ -46,6 +46,13 @@ while true; do
   shift
 done
 
+if [ -f '#ETCDIR#/check-kernel.conf' ]; then
+  if ! . '#ETCDIR#/check-kernel.conf'; then
+    >&2 printf 'Sourcing "#ETCDIR#/check-kernel.conf" failed.\n'
+    exit 1
+  fi
+fi
+
 unset installed
 if which pacman >/dev/null 2>&1; then
   # arch linux
@@ -133,6 +140,11 @@ else
     "${installed}" \
     "${running}"
   if ${reboot}; then
+    if declare -F reboot_check_hook >/dev/null \
+      && ! reboot_check_hook; then
+      >&2 printf 'reboot_check_hook() failed.\n'
+      exit 1
+    fi
     >&2 printf 'Press enter to reboot ...'
     read s
     if [ -z "${s}" ]; then
-- 
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