80 lines
2.6 KiB
Bash
Executable File
80 lines
2.6 KiB
Bash
Executable File
#!/bin/sh
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echo "*** BUILD BUSYBOX BEGIN ***"
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SRC_DIR=$(pwd)
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# Read the 'JOB_FACTOR' property from '.config'
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JOB_FACTOR="$(grep -i ^JOB_FACTOR .config | cut -f2 -d'=')"
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# Find the number of available CPU cores.
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NUM_CORES=$(grep ^processor /proc/cpuinfo | wc -l)
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# Calculate the number of 'make' jobs to be used later.
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NUM_JOBS=$((NUM_CORES * JOB_FACTOR))
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# Remember the sysroot
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SYSROOT=$(pwd)/work/sysroot
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cd work/busybox
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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. This may take a while..."
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make distclean -j $NUM_JOBS
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# Read the 'USE_PREDEFINED_BUSYBOX_CONFIG' property from '.config'
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USE_PREDEFINED_BUSYBOX_CONFIG="$(grep -i ^USE_PREDEFINED_BUSYBOX_CONFIG $SRC_DIR/.config | cut -f2 -d'=')"
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if [ "$USE_PREDEFINED_BUSYBOX_CONFIG" = "true" -a ! -f $SRC_DIR/minimal_config/busybox.config ] ; then
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echo "Config file $SRC_DIR/minimal_config/busybox.config does not exist."
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USE_PREDEFINED_BUSYBOX_CONFIG="false"
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fi
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if [ "$USE_PREDEFINED_BUSYBOX_CONFIG" = "true" ] ; then
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# Use predefined configuration file for Busybox.
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echo "Using config file $SRC_DIR/minimal_config/busybox.config"
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cp -f $SRC_DIR/minimal_config/busybox.config .config
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else
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# Create default configuration file.
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echo "Generating default BusyBox configuration..."
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make defconfig -j $NUM_JOBS
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# The 'inetd' applet fails to compile because we use the glibc installation area as
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# main pointer to the kernel headers (see 05_prepare_glibc.sh) and some headers are
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# not resolved. The easiest solution is to ignore this particular applet.
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sed -i "s/.*CONFIG_INETD.*/CONFIG_INETD=n/" .config
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fi
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# This variable holds the full path to the glibc installation area as quoted string.
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# All back slashes are escaped (/ => \/) in order to keep the 'sed' command stable.
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SYSROOT_ESCAPED=$(echo \"$SYSROOT\" | sed 's/\//\\\//g')
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# Now we tell BusyBox to use the glibc prepared area.
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sed -i "s/.*CONFIG_SYSROOT.*/CONFIG_SYSROOT=$SYSROOT_ESCAPED/" .config
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# Read the 'CFLAGS' property from '.config'
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CFLAGS="$(grep -i ^CFLAGS .config | cut -f2 -d'=')"
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# Compile busybox with optimization for "parallel jobs" = "number of processors".
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echo "Building BusyBox..."
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make \
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EXTRA_CFLAGS="$CFLAGS" \
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busybox -j $NUM_JOBS
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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 \
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CONFIG_PREFIX="../busybox_installed" \
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install -j $NUM_JOBS
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cd $SRC_DIR
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echo "*** BUILD BUSYBOX END ***"
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