Merge pull request #2 from BeresfordHare/master

The suggested changes look great and I'm merging them in the current sources. This hasn't tested them yet (TODO) but the changes are quite simple and I believe there will be no issues at all.

src/0_prepare.sh

@@ -3,3 +3,5 @@
 rm -rf work
 mkdir work
 
+# -p stops errors if the directory already exists
+mkdir -p source

src/1_get_kernel.sh

@@ -1,13 +1,22 @@
 #!/bin/sh
 
+# Grab everything after the '=' sign
 DOWNLOAD_URL=$(grep -i KERNEL_SOURCE_URL .config | cut -f2 -d'=')
+
+# Grab everything after the last '/'
 ARCHIVE_FILE=${DOWNLOAD_URL##*/}
 
-cd work
-rm -f $ARCHIVE_FILE
-wget $DOWNLOAD_URL
-rm -rf kernel
-mkdir kernel
-tar -xvf $ARCHIVE_FILE -C kernel
-cd ..
+cd source
 
+# Downloading kernel file
+# -c option allows the download to resume
+wget -c $DOWNLOAD_URL
+
+# Delete folder with previously extracted kernel
+rm -rf ../work/kernel
+mkdir ../work/kernel
+
+# Extract kernel to folder 'kernel'
+# Full path will be something like, kernel\linux-3.16
+tar -xvf $ARCHIVE_FILE -C ../work/kernel
+cd ..

src/2_build_kernel.sh

@@ -1,10 +1,21 @@
-#/bin/sh
+#!/bin/sh
 
 cd work/kernel
-cd $(ls -d *)
-make clean
-make defconfig
-sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal-linux-live\"/" .config
-make vmlinux
-cd ../../..
 
+# Change to the first directory ls finds, e.g. linux-3.16
+cd $(ls -d *)
+
+# Cleans up the kernel sources, including configuration files
+make mrproper
+
+# Create a default configuration file for the kernel
+make defconfig
+
+# Changes the name of the system
+sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal-linux-live\"/" .config
+
+# Compile the kernel
+# Good explanation of the different kernels
+# http://unix.stackexchange.com/questions/5518/what-is-the-difference-between-the-following-kernel-makefile-terms-vmlinux-vmlinux
+make bzImage
+cd ../../..

src/3_get_busybox.sh

@@ -1,13 +1,23 @@
-#/bin/sh
+#!/bin/sh
 
+# Grab everything after the '=' sign
 DOWNLOAD_URL=$(grep -i BUSYBOX_SOURCE_URL .config | cut -f2 -d'=')
+
+# Grab everything after the last '/'
 ARCHIVE_FILE=${DOWNLOAD_URL##*/}
 
-cd work
-rm -f $ARCHIVE_FILE
-wget $DOWNLOAD_URL
-rm -rf busybox
-mkdir busybox
-tar -xvf $ARCHIVE_FILE -C busybox
+cd source
+
+# Downloading busybox source
+# -c option allows the download to resume
+wget -c $DOWNLOAD_URL
+
+# Delete folder with previously extracted busybox
+rm -rf ../work/busybox
+mkdir ../work/busybox
+
+# Extract kernel to folder 'busybox'
+# Full path will be something like, busybox\busybox-1.22.1
+tar -xvf $ARCHIVE_FILE -C ../work/busybox
 cd ..
 

src/4_build_busybox.sh

@@ -1,11 +1,25 @@
-#/bin/sh
+#!/bin/sh
 
 cd work/busybox
-cd $(ls -d *)
-make clean
-make defconfig
-sed -i "s/.*CONFIG_STATIC.*/CONFIG_STATIC=y/" .config
-make busybox
-make install
-cd ../../..
 
+# Change to the first directory ls finds, e.g/ busybox-1.22.1
+cd $(ls -d *)
+
+# Clean's the source?
+make clean
+
+# Create a default configuration file
+make defconfig
+
+# Change the configuration, so that busybox is statically compiled
+# You could do this manually with 'make menuconfig'
+sed -i "s/.*CONFIG_STATIC.*/CONFIG_STATIC=y/" .config
+
+# Compile busybox
+make busybox
+
+# Create the symlinks for busybox
+# It uses the file busybox.links for this
+make install
+
+cd ../../..