From 579d96f06f94a77363d467789ff95fcf5ed281b8 Mon Sep 17 00:00:00 2001
From: natrixaeria <upezu@student.kit.edu>
Date: Thu, 24 Oct 2019 18:54:12 +0200
Subject: Build things only if necessary in build script

---
 kernel/build.sh | 30 +++++++++++++++++++++---------
 1 file changed, 21 insertions(+), 9 deletions(-)

diff --git a/kernel/build.sh b/kernel/build.sh
index 530c253..919951b 100755
--- a/kernel/build.sh
+++ b/kernel/build.sh
@@ -30,7 +30,10 @@ build_kernel_elf() {
     cleanup_temp
 }
 
-build_kernel_iso_from_elf() {
+build_kernel_iso() {
+    if test ! -e $TARGET_PATH/kernel.bin; then
+        build_kernel_elf
+    fi
     create_target
     mkdir $TMP_PATH/isofiles &> /dev/null
     mkdir $TMP_PATH/isofiles/boot &> /dev/null
@@ -38,17 +41,24 @@ build_kernel_iso_from_elf() {
     cp $TARGET_PATH/kernel.bin $TMP_PATH/isofiles/boot &> /dev/null
     cp $GRUB_CFG_PATH $TMP_PATH/isofiles/boot/grub/grub.cfg &> /dev/null
     grub-mkrescue -d /usr/lib/grub/i386-pc -o $TARGET_PATH/uff.iso $TMP_PATH/isofiles
-}
-
-build_kernel_iso() {
-    build_kernel_elf
-    build_kernel_iso_from_elf
+    cleanup_temp
 }
 
 build_init() {
     create_target
 }
 
+build_launch() {
+    qemu-system-x86_64 -cdrom $TARGET_PATH/uff.iso
+}
+
+build_run() {
+    if test ! -e $TARGET_PATH/uff.iso; then
+        build_kernel_iso
+    fi
+    build_launch
+}
+
 build_clean() {
     remove_target
 }
@@ -62,9 +72,10 @@ not_exec=true
 for arg in "$@"; do
     case "$arg" in
         "kernel-elf") build_kernel_elf;;
-        "kernel-iso-from-elf") build_kernel_iso_from_elf;;
         "kernel-iso") build_kernel_iso;;
         "init") build_init;;
+        "launch") build_launch;;
+        "run") build_run;;
         "clean") build_clean;;
         "all") build_all;;
         *)
@@ -80,10 +91,11 @@ print_help() {
     echo "options: "
     echo "  init                      initialise directory"
     echo "  clean                     cleanup binaries"
+    echo "  launch                    launch iso in qemu"
+    echo "  run                       creates iso if necessary and runs it in qemu"
     echo
     echo "  kernel-elf                build the kernel-elf"
-    echo "  kernel-iso-from-elf       build the kernel-iso from an existing kernel-elf"
-    echo "  kernel-iso                build the kernel-elf and the kernel-iso"
+    echo "  kernel-iso                build the kernel-elf if necessary and the kernel-iso"
     echo "  all                       build kernel"
 }
 
-- 
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