From 2f1b285214845b232d0fb8af41e6fe0d2468bb3d Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Mon, 28 Mar 2022 21:13:49 +0200
Subject: new option: -f|--force

---
 makekernel.8.in | 14 ++++++++++----
 makekernel.in   | 21 +++++++++++++++++++--
 2 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/makekernel.8.in b/makekernel.8.in
index e8de042..d11a07d 100644
--- a/makekernel.8.in
+++ b/makekernel.8.in
@@ -5,7 +5,7 @@ makekernel \- small script to compile linux kernel
 .TP
 \fBmakekernel [\-s|\-\-showVersion]\fP
 .TP
-\fBmakekernel [\-c|\-\-compileVersion \fIversion\fB] [\-a|\-\-allowDownload]\fP
+\fBmakekernel [\-a|\-\-allowDownload] [\-c|\-\-compileVersion \fIversion\fB] [\-f|\-\-force] [\-n|\-\-noAction]\fP
 .SH DESCRIPTION
 \fBmakekernel\fP downloads and compiles the linux kernel, preferably downloading a patch instead of the full source.
 .SH OPTIONS
@@ -15,12 +15,18 @@ Show version of most current available stable kernel.
 Does not compile or download any source code nor patch.
 Conflicts with all other options.
 .TP
-.B "\-c, \-\-compileVersion \fIversion\fP"
-Force current version to \fIversion\fP.
-.TP
 .B "\-a, \-\-allowDownload"
 Allow to download a full source if necessary.
 \fBmakekernel\fP will still download a patch if available.
+.TP
+.B "\-c, \-\-compileVersion \fIversion\fP"
+Force current version to \fIversion\fP.
+.TP
+.B "\-f, \-\-force"
+Build kernel even if it appears to be up to date.
+.TP
+.B "\-n, \-\-noAction"
+Do not do anything, just print what would be done.
 .SH CONFIGURATION
 The configfile \fB#ETCDIR#/makekernel.conf\fP is a bash script, which defines the following variables and routines:
 .TP
diff --git a/makekernel.in b/makekernel.in
index c165b47..099b604 100644
--- a/makekernel.in
+++ b/makekernel.in
@@ -5,12 +5,14 @@ set -e
 usage () {
   >&2 echo 'makekernel version #VERSION#'
   >&2 echo 'usage:'
-  >&2 echo '  makekernel [ -a | --allowDownload ] [ -c $version | --compileVersion=$version ] [ -n | --noAction ]:'
+  >&2 echo '  makekernel [ -a | --allowDownload ] [ -c $version | --compileVersion=$version ] [ -f | --force ] [ -n | --noAction ]:'
   >&2 echo '    download and compile kernel'
   >&2 echo '      -a | --allowDownload:'
   >&2 echo '        allow to download complete source instead of patch if necessary'
   >&2 echo '      -c | --compileVersion $version:'
   >&2 echo '        download and compile version $version instead of most current stable'
+  >&2 echo '      -f | --force:'
+  >&2 echo '        build kernel even if it appears to be up to date'
   >&2 echo '      -n | --noAction:'
   >&2 echo '        do not do anything, just print what would be done'
   >&2 echo '  makekernel ( -s | --showVersion ):'
@@ -46,9 +48,10 @@ then
 fi
 
 eval set -- "$(
-  getopt -o ac:ns \
+  getopt -o ac:fns \
     --long allowDownload \
     --long compileVersion: \
+    --long force \
     --long noAction \
     --long showVersion \
     -n "$(basename "$0")" \
@@ -56,6 +59,7 @@ eval set -- "$(
 )"
 
 allowDownload=false
+forceBuild=false
 forceVersion=false
 showVersion=false
 noAction=false
@@ -77,12 +81,18 @@ do
       forceVersion=true
       shift
     ;;
+    -f|--force)
+      ${showVersion} && usage
+      forceBuild=true
+      shift
+    ;;
     -n|--noAction)
       ${showVersion} && usage
       noAction=true
     ;;
     -s|--showVersion)
       ${allowDownload} && usage
+      ${forceBuild} && usage
       ${forceVersion} && usage
       ${showVersion} && usage
       ${noAction} && usage
@@ -137,6 +147,13 @@ then
 fi
 
 [ -z "${curVer}" ] && curVer="$("$0" -s)"
+
+if ! ${forceBuild} \
+&& [ -f '/boot/vmlinuz-'"${curVer}" ]; then
+  >&2 echo 'kernel is up to date.'
+  exit
+fi
+
 mainVer="$(
   echo "${curVer}" | \
     sed 's|^\([0-9]\+\.[0-9]\+\)\(\..*\)\?$|\1|'
-- 
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