BusyBox and glibc now use separate object/install/prepare folders. Kernel and initramfs are reconfigured to use XZ compression. Added more CFLAGS for smaller output size. As result the fina ISO image is significantly smaller than before.
This commit is contained in:
Ivan Davidov
parent
e6b5e215f0
commit
c61f217835
@ -4,8 +4,8 @@ SRC_DIR=$(pwd)
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cd work/kernel
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# Change to the first directory ls finds, e.g. 'linux-4.4.6'.
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cd $(ls -d *)
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# Change to the kernel source directory which ls finds, e.g. 'linux-4.4.6'.
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cd $(ls -d linux-*)
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# Cleans up the kernel sources, including configuration files.
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echo "Preparing kernel work area..."
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@ -33,6 +33,12 @@ else
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# Enable overlay support, e.g. merge ro and rw directories.
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sed -i "s/.*CONFIG_OVERLAY_FS.*/CONFIG_OVERLAY_FS=y/" .config
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# Step 1 - disable all active kernel compression options (should be only one).
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sed -i "s/.*\\(CONFIG_KERNEL_.*\\)=y/\\#\\ \\1 is not set/" .config
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# Step 2 - enable the 'xz' compression option.
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sed -i "s/.*CONFIG_KERNEL_XZ.*/CONFIG_KERNEL_XZ=y/" .config
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fi
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# Compile the kernel with optimization for 'parallel jobs' = 'number of processors'.
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@ -40,7 +46,7 @@ fi
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# http://unix.stackexchange.com/questions/5518/what-is-the-difference-between-the-following-kernel-makefile-terms-vmlinux-vmlinux
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echo "Building kernel..."
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make \
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CFLAGS="-Os -fno-stack-protector -U_FORTIFY_SOURCE" \
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CFLAGS="-Os -s -fno-stack-protector -U_FORTIFY_SOURCE" \
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bzImage -j $(grep ^processor /proc/cpuinfo | wc -l)
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# Install kernel headers in './usr' (this is not '/usr') which are used later
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@ -2,49 +2,53 @@
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# Find the kernel build directory.
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cd work/kernel
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cd $(ls -d *)
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cd $(ls -d kernel-*)
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WORK_KERNEL_DIR=$(pwd)
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cd ../../..
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cd work/glibc
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# Change to the first directory ls finds, e.g. 'glibc-2.23'.
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cd $(ls -d *)
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# Find the glibc source directory, e.g. 'glibc-2.23' and remember it.
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cd $(ls -d glibc-*)
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GLIBC_SRC=$(pwd)
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cd ..
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# Prepare working area, e.g. 'work/glibc/glibc-2.23/glibc_objects'.
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# Prepare the work area, e.g. 'work/glibc/glibc_objects'.
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echo "Preparing glibc object area. This may take a while..."
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rm -rf ./glibc_objects
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rm -rf glibc_objects
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mkdir glibc_objects
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# Prepare install area, e.g. 'work/glibc/glibc-2.23/glibc_installed'.
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rm -rf ./glibc_installed
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# Prepare the install area, e.g. 'work/glibc/glibc_installed'.
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echo "Preparing glibc install area. This may take a while..."
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rm -rf glibc_installed
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mkdir glibc_installed
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cd glibc_installed
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GLIBC_INSTALLED=$(pwd)
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echo "Prepared glibc install area."
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GLIBC_INSTALLED=$(pwd)/glibc_installed
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# All glibc work is done from the working area.
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cd ../glibc_objects
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cd glibc_objects
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# glibc is configured to use the root folder (--prefix=) and as result all libraries
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# will be installed in '/lib'. Kernel headers are taken from our already prepared
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# kernel header area (see 02_build_kernel.sh). Packages 'gd' and 'selinux' are disabled.
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# glibc is configured to use the root folder (--prefix=) and as result all
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# libraries will be installed in '/lib'. Kernel headers are taken from our
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# already prepared kernel header area (see 02_build_kernel.sh). Packages 'gd'
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# and 'selinux' are disabled.
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echo "Configuring glibc..."
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../configure \
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$GLIBC_SRC/configure \
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--prefix= \
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--with-headers=$WORK_KERNEL_DIR/usr/include \
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--without-gd \
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--without-selinux \
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--disable-werror \
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CFLAGS="-Os -fno-stack-protector -U_FORTIFY_SOURCE"
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CFLAGS="-Os -s -fno-stack-protector -U_FORTIFY_SOURCE"
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# Compile glibc with optimization for "parallel jobs" = "number of processors".
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echo "Building glibc..."
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make -j $(grep ^processor /proc/cpuinfo | wc -l)
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# Install glibc in the installation area, e.g. 'work/glibc/glibc-2.23/glibc_installed'.
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# Install glibc in the installation area, e.g. 'work/glibc/glibc_installed'.
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echo "Installing glibc..."
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make install DESTDIR=$GLIBC_INSTALLED -j $(grep ^processor /proc/cpuinfo | wc -l)
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make install \
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DESTDIR=$GLIBC_INSTALLED \
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-j $(grep ^processor /proc/cpuinfo | wc -l)
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cd ../../..
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@ -8,10 +8,12 @@ cd ../../..
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cd work/glibc
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# Change to the first directory ls finds, e.g. 'glibc-2.22'
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cd $(ls -d *)
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echo "Preparing glibc..."
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cd glibc_installed
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rm -rf glibc_prepared
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cp -r glibc_installed glibc_prepared
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cd glibc_prepared
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# Create custom 'usr' area and link it with some of the kernel header directories.
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# BusyBox compilation process uses these linked directories. The following
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@ -31,29 +33,17 @@ cd glibc_installed
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# |
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# +--lib (glibc)
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echo "Preparing glibc..."
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mkdir -p usr
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cd usr
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unlink include 2>/dev/null
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ln -s ../include include
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unlink lib 2>/dev/null
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ln -s ../lib lib
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cd ../include
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unlink linux 2>/dev/null
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ln -s $WORK_KERNEL_DIR/usr/include/linux linux
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unlink asm 2>/dev/null
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ln -s $WORK_KERNEL_DIR/usr/include/asm asm
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unlink asm-generic 2>/dev/null
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ln -s $WORK_KERNEL_DIR/usr/include/asm-generic asm-generic
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unlink mtd 2>/dev/null
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ln -s $WORK_KERNEL_DIR/usr/include/mtd mtd
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cd ../../../..
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@ -2,20 +2,19 @@
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SRC_DIR=$(pwd)
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# Find the glibc installation area.
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cd work/glibc
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cd $(ls -d *)
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cd glibc_installed
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GLIBC_INSTALLED=$(pwd)
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cd ../../../..
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# Remember the glibc installation area.
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GLIBC_PREPARED=$(pwd)/work/glibc/glibc_prepared
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cd work/busybox
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# Change to the first directory ls finds, e.g. 'busybox-1.24.2'.
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cd $(ls -d *)
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# Remove the old BusyBox install area
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rm -rf busybox_installed
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# Change to the source directory ls finds, e.g. 'busybox-1.24.2'.
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cd $(ls -d busybox-*)
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# Remove previously generated artifacts.
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echo "Preparing BusyBox work area..."
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echo "Preparing BusyBox work area. This may take a while..."
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make distclean
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# Read the 'USE_PREDEFINED_BUSYBOX_CONFIG' property from '.config'
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@ -35,6 +34,9 @@ else
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echo "Generating default BusyBox configuration..."
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make defconfig
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# Set the installation folder for BusyBox.
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#sed -i "s/.*CONFIG_PREFIX.*/CONFIG_PREFIX=\"..\/busybox_installed\"/" .config
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# The 'inetd' applet fails to compile because we use the glibc installation area as
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# main pointer to the kernel headers (see 05_prepare_glibc.sh) and some headers are
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# not resolved. The easiest solution is to ignore this particular applet.
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@ -43,20 +45,20 @@ fi
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# This variable holds the full path to the glibc installation area as quoted string.
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# All back slashes are escaped (/ => \/) in order to keep the 'sed' command stable.
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GLIBC_INSTALLED_ESCAPED=$(echo \"$GLIBC_INSTALLED\" | sed 's/\//\\\//g')
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GLIBC_PREPARED_ESCAPED=$(echo \"$GLIBC_PREPARED\" | sed 's/\//\\\//g')
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# Now we tell BusyBox to use the glibc installation area.
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sed -i "s/.*CONFIG_SYSROOT.*/CONFIG_SYSROOT=$GLIBC_INSTALLED_ESCAPED/" .config
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sed -i "s/.*CONFIG_SYSROOT.*/CONFIG_SYSROOT=$GLIBC_PREPARED_ESCAPED/" .config
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# Compile busybox with optimization for "parallel jobs" = "number of processors".
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echo "Building BusyBox..."
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make \
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EXTRA_CFLAGS="-Os -fno-stack-protector -U_FORTIFY_SOURCE" \
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EXTRA_CFLAGS="-Os -s -fno-stack-protector -U_FORTIFY_SOURCE" \
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busybox -j $(grep ^processor /proc/cpuinfo | wc -l)
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# Create the symlinks for busybox. The file 'busybox.links' is used for this.
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echo "Generating BusyBox based initramfs area..."
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make install
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make CONFIG_PREFIX="../busybox_installed" install
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cd ../../..
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@ -1,30 +1,20 @@
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#!/bin/sh
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# Find the glibc installation area.
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cd work/glibc
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cd $(ls -d *)
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cd glibc_installed
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GLIBC_INSTALLED=$(pwd)
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cd ../../../..
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# Remember the prepared glibc folder.
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GLIBC_PREPARED=$(pwd)/work/glibc/glibc_prepared
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cd work
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echo "Preparing initramfs work area..."
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rm -rf rootfs
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cd busybox
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# Change to the first directory ls finds, e.g. 'busybox-1.24.2'.
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cd $(ls -d *)
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# Copy all BusyBox generated stuff to the location of our 'initramfs' folder.
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cp -r _install ../../rootfs
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cp -r busybox/busybox_installed rootfs
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# Copy all rootfs resources to the location of our 'initramfs' folder.
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cp -r ../../../08_generate_rootfs/* ../../rootfs
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cp -r ../08_generate_rootfs/* rootfs
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cd ../../rootfs
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cd rootfs
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# Remove 'linuxrc' which is used when we boot in 'RAM disk' mode.
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rm -f linuxrc
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@ -44,15 +34,15 @@ chmod -R +r **/*.txt
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# Copy all necessary 'glibc' libraries to '/lib' BEGIN.
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# This is the dynamic loader. The file name is different for 32-bit and 64-bit machines.
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cp $GLIBC_INSTALLED/lib/ld-linux* ./lib
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cp $GLIBC_PREPARED/lib/ld-linux* ./lib
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# BusyBox has direct dependencies on these libraries.
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cp $GLIBC_INSTALLED/lib/libm.so.6 ./lib
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cp $GLIBC_INSTALLED/lib/libc.so.6 ./lib
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cp $GLIBC_PREPARED/lib/libm.so.6 ./lib
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cp $GLIBC_PREPARED/lib/libc.so.6 ./lib
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# These libraries are necessary for the DNS resolving.
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cp $GLIBC_INSTALLED/lib/libresolv.so.2 ./lib
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cp $GLIBC_INSTALLED/lib/libnss_dns.so.2 ./lib
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cp $GLIBC_PREPARED/lib/libresolv.so.2 ./lib
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cp $GLIBC_PREPARED/lib/libnss_dns.so.2 ./lib
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# Make sure the dynamic loader is visible on 64-bit machines.
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ln -s lib lib64
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@ -7,9 +7,9 @@ rm -f rootfs.cpio.gz
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cd rootfs
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# Packs the current 'initramfs' folder structure in 'cpio.gz' archive.
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# Packs the current 'initramfs' folder structure in 'cpio.xz' archive.
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echo "Packing initramfs..."
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find . | cpio -R root:root -H newc -o | gzip > ../rootfs.cpio.gz
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find . | cpio -R root:root -H newc -o | xz --check=none > ../rootfs.cpio.xz
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cd ../..
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@ -32,10 +32,10 @@ cp $WORK_SYSLINUX_DIR/bios/core/isolinux.bin .
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cp $WORK_SYSLINUX_DIR/bios/com32/elflink/ldlinux/ldlinux.c32 .
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# Now we copy the kernel.
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cp $WORK_KERNEL_DIR/arch/x86/boot/bzImage ./kernel.bz
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cp $WORK_KERNEL_DIR/arch/x86/boot/bzImage ./kernel.xz
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# Now we copy the root file system.
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cp ../rootfs.cpio.gz ./rootfs.gz
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cp ../rootfs.cpio.xz ./rootfs.xz
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# Copy all source files to '/src'. Note that the scripts won't work there.
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mkdir src
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@ -104,7 +104,7 @@ else
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fi
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# Create ISOLINUX configuration file.
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echo 'default kernel.bz initrd=rootfs.gz' > ./isolinux.cfg
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echo 'default kernel.xz initrd=rootfs.xz' > ./isolinux.cfg
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# Delete the '.gitignore' files which we use in order to keep track of otherwise
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# empty folders.
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