Major reorganization - initramfs structure is now externalized in separate folder structure. Added support for overlay from folders and disk images. Overlay structure has been externalized in separate folder. Added support to use preconfigured ".config" files for BusyBox and kernel.
This commit is contained in:
Ivan Davidov
parent
2bb6218b8d
commit
05b62fd32e
28
src/.config
28
src/.config
@ -24,3 +24,31 @@ BUSYBOX_SOURCE_URL=http://busybox.net/downloads/busybox-1.24.2.tar.bz2
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#
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SYSLINUX_SOURCE_URL=https://www.kernel.org/pub/linux/utils/boot/syslinux/syslinux-6.03.tar.xz
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### ### ###
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### ### ###
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### ### ###
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# Use predefined '.config' file when building the kernel. This overrides the config generation
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# in '02_build_kernel.sh' and uses the config file provided in this parameter. You can comment,
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# leave undefined or use nonexisting file in order to disable the property and rely on automatic
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# config generation.
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#
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# KERNEL_CONFIG_FILE=kernel.config
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# Use predefined '.config' file when building BusyBox. This overrides the config generation in
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# '07_build_busybox.sh' and uses the config file provided in this parameter. Leave undefined or
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# comment the property in order to disable it and rely on automatic config generation.
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#
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# BUSYBOX_CONFIG_FILE=busybox.config
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# Define the overlay type to use. Possible values are 'sparse' and 'folder'. You can use any other
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# value, no value, or comment the property in order to disable it.
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#
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# sparse - use sparse file with hardcoded maximal size of 1MB (see 11_generate_iso.sh). This option
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# requires root permissions. The generated ISO image is larger.
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#
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# folder - use normal folder structure. Currently this doesn't work if the file system is 'vfat'
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# because FAT requires special handling, e.g. POSIX overlay (http://sf.net/p/posixovl).
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#
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OVERLAY_TYPE=sparse
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@ -1,23 +1,35 @@
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#!/bin/sh
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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 $(ls -d *)
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# Cleans up the kernel sources, including configuration files.
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make mrproper
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# make mrproper
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# Create default configuration file for the kernel.
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make defconfig
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# Read the 'KERNEL_CONFIG_FILE' property from '.config'
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KERNEL_CONFIG_FILE="$SRC_DIR/$(grep -i KERNEL_CONFIG_FILE $SRC_DIR/.config | cut -f2 -d'=')"
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# Changes the name of the system to 'minimal'.
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sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal\"/" .config
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if [ -f $KERNEL_CONFIG_FILE ] ; then
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# Use predefined configuration file for the kernel.
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cp $KERNEL_CONFIG_FILE .config
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else
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# Create default configuration file for the kernel.
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make defconfig
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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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# Changes the name of the system to 'minimal'.
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sed -i "s/.*CONFIG_DEFAULT_HOSTNAME.*/CONFIG_DEFAULT_HOSTNAME=\"minimal\"/" .config
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# Compile the kernel with optimization for "parallel jobs" = "number of processors".
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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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fi
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exit 0
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# Compile the kernel with optimization for 'parallel jobs' = 'number of processors'.
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# Good explanation of the different kernels:
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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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make bzImage -j $(grep ^processor /proc/cpuinfo | wc -l)
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@ -1,5 +1,7 @@
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#!/bin/sh
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SRC_DIR=$(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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@ -13,10 +15,25 @@ cd work/busybox
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cd $(ls -d *)
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# Remove previously generated artifacts.
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make distclean
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# make distclean
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# Create default configuration file.
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make defconfig
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# Read the 'BUSYBOX_CONFIG_FILE' property from '.config'
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BUSYBOX_CONFIG_FILE="$SRC_DIR/$(grep -iBUSYBOX_CONFIG_FILE $SRC_DIR/.config | cut -f2 -d'=')"
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if [ -f $BUSYBOX_CONFIG_FILE ] ; then
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# Use predefined configuration file for Busybox.
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cp $BUSYBOX_CONFIG_FILE .config
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else
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# Create default configuration file.
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make defconfig
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# The 'inetd' applet fails to compile because we use the glibc installation area as
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# main pointer to the kernel headers (see 05_prepare_glibc.sh) and some headers are
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# not resolved. The easiest solution is to ignore this particular applet.
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sed -i "s/.*CONFIG_INETD.*/CONFIG_INETD=n/" .config
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fi
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exit 0
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# This variable holds the full path to the glibc installation area as quoted string.
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# All back slashes are escaped (/ => \/) in order to keep the 'sed' command stable.
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@ -25,11 +42,6 @@ GLIBC_INSTALLED_ESCAPED=$(echo \"$GLIBC_INSTALLED\" | sed 's/\//\\\//g')
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# Now we tell BusyBox to use the glibc installation area.
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sed -i "s/.*CONFIG_SYSROOT.*/CONFIG_SYSROOT=$GLIBC_INSTALLED_ESCAPED/" .config
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# 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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sed -i "s/.*CONFIG_INETD.*/CONFIG_INETD=n/" .config
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# Compile busybox with optimization for "parallel jobs" = "number of processors".
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make busybox -j $(grep ^processor /proc/cpuinfo | wc -l)
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@ -18,234 +18,26 @@ cd busybox
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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 _install ../../rootfs
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# Copy all rootfs stuff to the location of our 'initramfs' folder.
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cp -r ../../../08_generate_rootfs/* ../../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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# Create the missing root FS folders.
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mkdir etc
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mkdir dev
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mkdir lib
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mkdir mnt
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mkdir proc
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mkdir root
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mkdir src
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mkdir sys
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mkdir tmp
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cd etc
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# The script '/etc/prepare.sh' is automatically executed as part of the '/init'
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# process. We suppress most kernel messages and mount all cryitical file systems.
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cat > prepare.sh << EOF
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#!/bin/sh
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dmesg -n 1
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mount -t devtmpfs none /dev
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mount -t proc none /proc
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mount -t tmpfs none /tmp -o mode=1777
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mount -t sysfs none /sys
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EOF
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chmod +x prepare.sh
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# The script '/etc/switch.sh' is automatically executed as part of the '/init'
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# process. We overlay the '/minimal/rootfs' folder from the boot media, copy all
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# files and folders to new mountpoint and then execute the command 'switch_root'.
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cat > switch.sh << EOF
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#!/bin/sh
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# Create the new mountpoint in RAM.
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mount -t tmpfs none /mnt
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# Create folders for all critical file systems.
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echo "Create folders for all critical file systems..."
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mkdir /mnt/dev
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mkdir /mnt/sys
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mkdir /mnt/proc
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mkdir /mnt/tmp
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echo "...done."
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# Copy root folders in the new mountpoint.
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echo "Copying the root file system to /mnt..."
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cp -a bin etc lib lib64 root sbin src usr /mnt
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echo "...done."
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mkdir /tmp/mnt
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echo "Searching available devices for /minimal/rootfs folder..."
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for DEVICE in /dev/* ; do
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DEV=\$(echo "\${DEVICE##*/}")
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SYSDEV=\$(echo "/sys/class/block/\$DEV")
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case \$DEV in
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*loop*) continue ;;
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esac
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if [ ! -d "\$SYSDEV" ] ; then
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continue
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fi
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mount \$DEVICE /tmp/mnt 2>/dev/null
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if [ -d /tmp/mnt/minimal/rootfs ] ; then
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echo " Found /minimal/rootfs folder on device \$DEV."
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touch /tmp/mnt/minimal/rootfs/minimal.pid 2>/dev/null
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if [ -f /tmp/mnt/minimal/rootfs/minimal.pid ] ; then
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echo " Trying to overlay in read/write mode..."
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rm -f /tmp/mnt/minimal/rootfs/minimal.pid
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mount -t overlay -o lowerdir=/mnt,upperdir=/tmp/mnt/minimal/rootfs,workdir=/tmp/mnt/minimal/work none /mnt
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OUT=\$?
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if [ ! "\$OUT" = "0" ] ; then
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echo " Mount failed (probably on vfat), moving on with other devices."
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umount /tmp/mnt 2>/dev/null
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continue
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fi
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else
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echo " Trying to overlay in read only mode..."
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mkdir -p /tmp/minimal/work
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mkdir -p /tmp/minimal/rootfs
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mount -t overlay -o lowerdir=/mnt:/tmp/mnt/minimal/rootfs,upperdir=/tmp/minimal/rootfs,workdir=/tmp/minimal/work none /mnt
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fi
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echo " ...done."
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break
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else
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umount /tmp/mnt 2>/dev/null
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fi
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done
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echo "...done."
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# Move critical file systems to the new mountpoint.
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echo "Remounting /dev, /sys, /tmp and /proc in /mnt..."
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mount --move /dev /mnt/dev
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mount --move /sys /mnt/sys
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mount --move /proc /mnt/proc
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mount --move /tmp /mnt/tmp
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echo "...done."
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# The new mountpoint becomes file system root. All original root folders are
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# deleted automatically as part of the command execution. The '/sbin/init'
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# process is invoked and it becomes the new PID 1 parent process.
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exec switch_root /mnt /sbin/init
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echo "You can never see this... unless there is a serious bug..."
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sleep 99999
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EOF
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chmod +x switch.sh
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# The script '/etc/bootscript.sh' is automatically executed as part of the
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# '/sbin/init' proess. All core boot configuration has been completed and now we
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# need to do the rest of the configuration on the user space level. Here we loop
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# through all available network devices and we configure them through DHCP.
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cat > bootscript.sh << EOF
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#!/bin/sh
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echo "Welcome to \"Minimal Linux Live\" (/sbin/init)"
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for DEVICE in /sys/class/net/* ; do
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echo "Found network device \${DEVICE##*/}"
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ip link set \${DEVICE##*/} up
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[ \${DEVICE##*/} != lo ] && udhcpc -b -i \${DEVICE##*/} -s /etc/rc.dhcp
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done
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EOF
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chmod +x bootscript.sh
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# The script '/etc/rc.dhcp' is automatically invoked for each network device.
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cat > rc.dhcp << EOF
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#!/bin/sh
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ip addr add \$ip/\$mask dev \$interface
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if [ "\$router" ]; then
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ip route add default via \$router dev \$interface
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fi
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if [ "\$ip" ]; then
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echo "DHCP configuration for device \$interface"
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echo "ip: \$ip"
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echo "mask: \$mask"
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echo "router: \$router"
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fi
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EOF
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chmod +x rc.dhcp
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# DNS resolving is done by using Google's public DNS servers.
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cat > resolv.conf << EOF
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nameserver 8.8.8.8
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nameserver 8.8.4.4
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EOF
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# The file '/etc/welcome.txt' is displayed on every boot of the system in each
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# available terminal.
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cat > welcome.txt << EOF
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#####################################
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# #
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# Welcome to "Minimal Linux Live" #
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# #
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#####################################
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EOF
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# The file '/etc/inittab' contains the configuration which defines how the
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# system will be initialized. Check the following URL for more details:
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# http://git.busybox.net/busybox/tree/examples/inittab
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cat > inittab << EOF
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::sysinit:/etc/bootscript.sh
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::restart:/sbin/init
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::ctrlaltdel:/sbin/reboot
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::once:cat /etc/welcome.txt
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::respawn:/bin/cttyhack /bin/sh
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tty2::once:cat /etc/welcome.txt
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tty2::respawn:/bin/sh
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tty3::once:cat /etc/welcome.txt
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tty3::respawn:/bin/sh
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tty4::once:cat /etc/welcome.txt
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tty4::respawn:/bin/sh
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EOF
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cd ..
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# The '/init' script is the first place where we gain execution control after
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# the kernel has been loaded. This script prepares the core file systems, then
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# creates new mountpoint in RAM which we use as new root location and finally
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# the execution is passed to the script '/sbin/init' which in turn looks for
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# the configuration file '/etc/inittab'.
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cat > init << EOF
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#!/bin/sh
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echo "Welcome to \"Minimal Linux Live\" (/init)"
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# Let's mount all core file systems.
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/etc/prepare.sh
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# Now let's create new mountpoint in RAM and make it our new root location.
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exec /etc/switch.sh
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EOF
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chmod +x init
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# Copy all source files to '/src'. Note that the scripts won't work there.
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cp ../../*.sh src
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cp ../../.config src
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cp ../../*.txt src
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chmod +rx src/*.sh
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chmod +r src/.config
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chmod +r src/*.txt
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cp -r ../../08_generate_rootfs src
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cp -r ../../11_generate_iso src
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chmod -R +rx **/*.sh
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chmod -R +r **/.config
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chmod -R +r **/*.txt
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# Copy all necessary 'glibc' libraries to '/lib' BEGIN.
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10
src/08_generate_rootfs/etc/bootscript.sh
Executable file
10
src/08_generate_rootfs/etc/bootscript.sh
Executable file
@ -0,0 +1,10 @@
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#!/bin/sh
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echo "Welcome to \"Minimal Linux Live\" (/sbin/init)"
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for DEVICE in /sys/class/net/* ; do
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echo "Found network device ${DEVICE##*/}"
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ip link set ${DEVICE##*/} up
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[ ${DEVICE##*/} != lo ] && udhcpc -b -i ${DEVICE##*/} -s /etc/rc.dhcp
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done
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12
src/08_generate_rootfs/etc/inittab
Normal file
12
src/08_generate_rootfs/etc/inittab
Normal file
@ -0,0 +1,12 @@
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::sysinit:/etc/bootscript.sh
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::restart:/sbin/init
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::ctrlaltdel:/sbin/reboot
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::once:cat /etc/welcome.txt
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::respawn:/bin/cttyhack /bin/sh
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tty2::once:cat /etc/welcome.txt
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tty2::respawn:/bin/sh
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tty3::once:cat /etc/welcome.txt
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tty3::respawn:/bin/sh
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tty4::once:cat /etc/welcome.txt
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tty4::respawn:/bin/sh
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9
src/08_generate_rootfs/etc/prepare.sh
Executable file
9
src/08_generate_rootfs/etc/prepare.sh
Executable file
@ -0,0 +1,9 @@
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#!/bin/sh
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dmesg -n 1
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mount -t devtmpfs none /dev
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mount -t proc none /proc
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mount -t tmpfs none /tmp -o mode=1777
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mount -t sysfs none /sys
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15
src/08_generate_rootfs/etc/rc.dhcp
Executable file
15
src/08_generate_rootfs/etc/rc.dhcp
Executable file
@ -0,0 +1,15 @@
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#!/bin/sh
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ip addr add $ip/$mask dev $interface
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if [ "$router" ]; then
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ip route add default via $router dev $interface
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fi
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if [ "$ip" ]; then
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echo "DHCP configuration for device $interface"
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echo "ip: $ip"
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echo "mask: $mask"
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echo "router: $router"
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fi
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3
src/08_generate_rootfs/etc/resolv.conf
Normal file
3
src/08_generate_rootfs/etc/resolv.conf
Normal file
@ -0,0 +1,3 @@
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nameserver 8.8.8.8
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nameserver 8.8.4.4
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149
src/08_generate_rootfs/etc/switch.sh
Executable file
149
src/08_generate_rootfs/etc/switch.sh
Executable file
@ -0,0 +1,149 @@
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#!/bin/sh
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# Create the new mountpoint in RAM.
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mount -t tmpfs none /mnt
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# Create folders for all critical file systems.
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echo "Create folders for all critical file systems..."
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mkdir /mnt/dev
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mkdir /mnt/sys
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mkdir /mnt/proc
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mkdir /mnt/tmp
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# Copy root folders in the new mountpoint.
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echo "Copying the root file system to /mnt..."
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cp -a bin etc lib lib64 root sbin src usr /mnt
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DEFAULT_OVERLAY_DIR="/tmp/minimal/overlay"
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DEFAULT_UPPER_DIR="/tmp/minimal/rootfs"
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DEFAULT_WORK_DIR="/tmp/minimal/work"
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echo "Searching available devices for overlay content..."
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for DEVICE in /dev/* ; do
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DEV=$(echo "${DEVICE##*/}")
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SYSDEV=$(echo "/sys/class/block/$DEV")
|
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|
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case $DEV in
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*loop*) continue ;;
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esac
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|
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if [ ! -d "$SYSDEV" ] ; then
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continue
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fi
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mkdir -p /tmp/mnt/device
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DEVICE_MNT=/tmp/mnt/device
|
||||
|
||||
OVERLAY_DIR=""
|
||||
OVERLAY_MNT=""
|
||||
UPPER_DIR=""
|
||||
WORK_DIR=""
|
||||
|
||||
mount $DEVICE $DEVICE_MNT 2>/dev/null
|
||||
if [ -d $DEVICE_MNT/minimal/rootfs ] && [ -d $DEVICE_MNT/minimal/work ] ; then
|
||||
# folder
|
||||
echo " Found '/minimal' folder on device '$DEVICE'."
|
||||
touch $DEVICE_MNT/minimal/rootfs/minimal.pid 2>/dev/null
|
||||
if [ -f $DEVICE_MNT/minimal/rootfs/minimal.pid ] ; then
|
||||
# read/write mode
|
||||
echo " Device '$DEVICE' is mounted in read/write mode."
|
||||
|
||||
rm -f $DEVICE_MNT/minimal/rootfs/minimal.pid
|
||||
|
||||
OVERLAY_DIR=$DEFAULT_OVERLAY_DIR
|
||||
OVERLAY_MNT=$DEVICE_MNT
|
||||
UPPER_DIR=$DEVICE_MNT/minimal/rootfs
|
||||
WORK_DIR=$DEVICE_MNT/minimal/work
|
||||
else
|
||||
# read only mode
|
||||
echo " Device '$DEVICE' is mounted in read only mode."
|
||||
|
||||
OVERLAY_DIR=$DEVICE_MNT/minimal/rootfs
|
||||
OVERLAY_MNT=$DEVICE_MNT
|
||||
UPPER_DIR=$DEFAULT_UPPER_DIR
|
||||
WORK_DIR=$DEFAULT_WORK_DIR
|
||||
fi
|
||||
elif [ -f $DEVICE_MNT/minimal.img ] ; then
|
||||
#image
|
||||
echo " Found '/minimal.img' image on device '$DEVICE'."
|
||||
|
||||
mkdir -p /tmp/mnt/image
|
||||
IMAGE_MNT=/tmp/mnt/image
|
||||
|
||||
LOOP_DEVICE=$(losetup -f)
|
||||
losetup $LOOP_DEVICE $DEVICE_MNT/minimal.img
|
||||
|
||||
mount $LOOP_DEVICE $IMAGE_MNT
|
||||
if [ -d $IMAGE_MNT/rootfs -a -d $IMAGE_MNT/work ] ; then
|
||||
touch $IMAGE_MNT/rootfs/minimal.pid 2>/dev/null
|
||||
if [ -f $IMAGE_MNT/rootfs/minimal.pid ] ; then
|
||||
# read/write mode
|
||||
echo " Image '$DEVICE/minimal.img' is mounted in read/write mode."
|
||||
|
||||
rm -f $IMAGE_MNT/rootfs/minimal.pid
|
||||
|
||||
OVERLAY_DIR=$DEFAULT_OVERLAY_DIR
|
||||
OVERLAY_MNT=$IMAGE_MNT
|
||||
UPPER_DIR=$IMAGE_MNT/rootfs
|
||||
WORK_DIR=$IMAGE_MNT/work
|
||||
else
|
||||
# read only mode
|
||||
echo " Image '$DEVICE/minimal.img' is mounted in read only mode."
|
||||
|
||||
OVERLAY_DIR=$IMAGE_MNT/rootfs
|
||||
OVERLAY_MNT=$IMAGE_MNT
|
||||
UPPER_DIR=$DEFAULT_UPPER_DIR
|
||||
WORK_DIR=$DEFAULT_WORK_DIR
|
||||
fi
|
||||
else
|
||||
umount $IMAGE_MNT
|
||||
rm -rf $IMAGE_MNT
|
||||
fi
|
||||
fi
|
||||
|
||||
if [ "$OVERLAY_DIR" != "" -a "$UPPER_DIR" != "" -a "$WORK_DIR" != "" ] ; then
|
||||
mkdir -p $OVERLAY_DIR
|
||||
mkdir -p $UPPER_DIR
|
||||
mkdir -p $WORK_DIR
|
||||
|
||||
mount -t overlay -o lowerdir=/mnt:$OVERLAY_DIR,upperdir=$UPPER_DIR,workdir=$WORK_DIR none /mnt 2>/dev/null
|
||||
|
||||
OUT=$?
|
||||
if [ ! "$OUT" = "0" ] ; then
|
||||
echo " Mount failed (probably on vfat)."
|
||||
|
||||
umount $OVERLAY_MNT 2>/dev/null
|
||||
rmdir $OVERLAY_MNT 2>/dev/null
|
||||
|
||||
rmdir $DEFAULT_OVERLAY_DIR 2>/dev/null
|
||||
rmdir $DEFAULT_UPPER_DIR 2>/dev/null
|
||||
rmdir $DEFAULT_WORK_DIR 2>/dev/null
|
||||
|
||||
else
|
||||
# All done, time to go.
|
||||
echo " Overlay data from device '$DEVICE' has been merged."
|
||||
break
|
||||
fi
|
||||
else
|
||||
echo " Device '$DEVICE' has no proper overlay structure."
|
||||
fi
|
||||
|
||||
umount $DEVICE_MNT 2>/dev/null
|
||||
rm -rf $DEVICE_MNT 2>/dev/null
|
||||
done
|
||||
|
||||
# Move critical file systems to the new mountpoint.
|
||||
echo "Remounting /dev, /sys, /tmp and /proc in /mnt..."
|
||||
mount --move /dev /mnt/dev
|
||||
mount --move /sys /mnt/sys
|
||||
mount --move /proc /mnt/proc
|
||||
mount --move /tmp /mnt/tmp
|
||||
|
||||
# The new mountpoint becomes file system root. All original root folders are
|
||||
# deleted automatically as part of the command execution. The '/sbin/init'
|
||||
# process is invoked and it becomes the new PID 1 parent process.
|
||||
exec switch_root /mnt /sbin/init
|
||||
|
||||
echo "You can never see this... unless there is a serious bug..."
|
||||
sleep 99999
|
||||
|
||||
7
src/08_generate_rootfs/etc/welcome.txt
Normal file
7
src/08_generate_rootfs/etc/welcome.txt
Normal file
@ -0,0 +1,7 @@
|
||||
|
||||
#####################################
|
||||
# #
|
||||
# Welcome to "Minimal Linux Live" #
|
||||
# #
|
||||
#####################################
|
||||
|
||||
10
src/08_generate_rootfs/init
Executable file
10
src/08_generate_rootfs/init
Executable file
@ -0,0 +1,10 @@
|
||||
#!/bin/sh
|
||||
|
||||
echo "Welcome to \"Minimal Linux Live\" (/init)"
|
||||
|
||||
# Let's mount all core file systems.
|
||||
/etc/prepare.sh
|
||||
|
||||
# Now let's create new mountpoint in RAM and make it our new root location.
|
||||
exec /etc/switch.sh
|
||||
|
||||
@ -1,5 +1,7 @@
|
||||
#!/bin/sh
|
||||
|
||||
SRC_DIR=$(pwd)
|
||||
|
||||
# Find the kernel build directory.
|
||||
cd work/kernel
|
||||
cd $(ls -d *)
|
||||
@ -41,19 +43,67 @@ chmod +rx src/*.sh
|
||||
chmod +r src/.config
|
||||
chmod +r src/*.txt
|
||||
|
||||
# Read the 'OVERLAY_TYPE' property from '.config'
|
||||
OVERLAY_TYPE="$(grep -i OVERLAY_TYPE $SRC_DIR/.config | cut -f2 -d'=')"
|
||||
if [ "$OVERLAY_TYPE" = "sparse" -a "$(id -u)" = "0" ] ; then
|
||||
# sparse
|
||||
|
||||
echo "Using sparse file for overlay."
|
||||
|
||||
# This is the BusyBox executable.
|
||||
BUSYBOX=../rootfs/bin/busybox
|
||||
|
||||
# Create sparse image file with 1MB size.
|
||||
$BUSYBOX truncate -s 1M minimal.img
|
||||
|
||||
# Find available loop device.
|
||||
LOOP_DEVICE=$($BUSYBOX losetup -f)
|
||||
|
||||
# Associate loop device with the sparse image file.
|
||||
$BUSYBOX losetup $LOOP_DEVICE minimal.img
|
||||
|
||||
# Format the sparse image file with Ext2 file system.
|
||||
$BUSYBOX mkfs.ext2 $LOOP_DEVICE
|
||||
|
||||
# Mount the sparse file in folder 'tmp_min".
|
||||
mkdir tmp_min
|
||||
$BUSYBOX mount minimal.img tmp_min
|
||||
|
||||
# Create the overlay folders.
|
||||
mkdir -p tmp_min/rootfs
|
||||
mkdir -p tmp_min/work
|
||||
|
||||
# Copy the overlay content.
|
||||
cp -r $SRC_DIR/11_generate_iso/* tmp_min/rootfs/
|
||||
|
||||
# Unmount the sparse file and thelete the temporary folder.
|
||||
$BUSYBOX umount tmp_min
|
||||
rm -rf tmp_min
|
||||
|
||||
# Detach the loop device.
|
||||
$BUSYBOX losetup -d $LOOP_DEVICE
|
||||
elif [ "$OVERLAY_TYPE" = "folder" ] ; then
|
||||
# folder
|
||||
echo "Using folder structure for overlay."
|
||||
mkdir -p minimal/rootfs
|
||||
mkdir -p minimal/work
|
||||
|
||||
cp -r $SRC_DIR/11_generate_iso/* minimal/rootfs/
|
||||
fi
|
||||
|
||||
# Create the overlay directory '/minimal/rootfs'. All files in this folder are
|
||||
# merged in the root folder and can be manipulated thanks to overlayfs.
|
||||
mkdir -p minimal/rootfs
|
||||
cd minimal/rootfs
|
||||
echo 'Sample file 1 from CD.' > file_from_cd_1.txt
|
||||
echo 'Sample file 2 from CD.' > file_from_cd_2.txt
|
||||
cd ../..
|
||||
#mkdir -p minimal/rootfs
|
||||
#cd minimal/rootfs
|
||||
#echo 'Sample file 1 from CD.' > file_from_cd_1.txt
|
||||
#echo 'Sample file 2 from CD.' > file_from_cd_2.txt
|
||||
#cd ../..
|
||||
|
||||
# Create ISOLINUX configuration file.
|
||||
echo 'default kernel.bz initrd=rootfs.gz' > ./isolinux.cfg
|
||||
|
||||
# Now we generate the ISO image file.
|
||||
genisoimage -J -r -o ../minimal_linux_live.iso -b isolinux.bin -c boot.cat -no-emul-boot -boot-load-size 4 -boot-info-table ./
|
||||
genisoimage -J -r -o ../minimal_linux_live.iso -b isolinux.bin -c boot.cat -input-charset UTF-8 -no-emul-boot -boot-load-size 4 -boot-info-table ./
|
||||
|
||||
# This allows the ISO image to be bootable if it is burned on USB flash drive.
|
||||
isohybrid ../minimal_linux_live.iso 2>/dev/null || true
|
||||
|
||||
7
src/11_generate_iso/README.txt
Normal file
7
src/11_generate_iso/README.txt
Normal file
@ -0,0 +1,7 @@
|
||||
|
||||
This file is located in directory '11_generate_iso'. You can use this directory
|
||||
to put your own content (files and folders) which will be visible in the root
|
||||
directory of your 'Minimal Linux Live' system, just like this file is visible.
|
||||
The files/folders will override the content in the root folder, so be careful
|
||||
what you put there because you may end up with broken system. :)
|
||||
|
||||
@ -1,4 +1,5 @@
|
||||
#!/bin/sh
|
||||
|
||||
qemu-system-i386 -m 64M -hda hdd.img -cdrom minimal_linux_live.iso -boot d
|
||||
qemu-system-i386 -m 64M -cdrom minimal_linux_live.iso -boot d
|
||||
#qemu-system-i386 -m 64M -hda hdd.img -cdrom minimal_linux_live.iso -boot d
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user