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# This class installs additional files found on the build host
# directly into the rootfs.
#
# One use case is to install a constant ssh host key in
# an image that gets created for just one machine. This
# solves two issues:
# - host key generation on the device can stall when the
# kernel has not gathered enough entropy yet (seen in practice
# under qemu)
# - ssh complains by default when the host key changes
#
# For dropbear, with the ssh host key store along side the local.conf:
# 1. Extend local.conf:
# INHERIT += "rootfsdebugfiles"
# ROOTFS_DEBUG_FILES += "${TOPDIR}/conf/dropbear_rsa_host_key ${IMAGE_ROOTFS}/etc/dropbear/dropbear_rsa_host_key ;"
# 2. Boot the image once, copy the dropbear_rsa_host_key from
# the device into your build conf directory.
# 3. A optional parameter can be used to set file mode
# of the copied target, for instance:
# ROOTFS_DEBUG_FILES += "${TOPDIR}/conf/dropbear_rsa_host_key ${IMAGE_ROOTFS}/etc/dropbear/dropbear_rsa_host_key 0600;"
# in case they might be required to have a specific mode. (Shoundn't be too open, for example)
#
# Do not use for production images! It bypasses several
# core build mechanisms (updating the image when one
# of the files changes, license tracking in the image
# manifest, ...).
ROOTFS_DEBUG_FILES ?= ""
ROOTFS_DEBUG_FILES[doc] = "Lists additional files or directories to be installed with 'cp -a' in the format 'source1 target1;source2 target2;...'"
ROOTFS_POSTPROCESS_COMMAND += "rootfs_debug_files ;"
rootfs_debug_files () {
#!/bin/sh -e
echo "${ROOTFS_DEBUG_FILES}" | sed -e 's/;/\n/g' | while read source target mode; do
if [ -e "$source" ]; then
mkdir -p $(dirname $target)
cp -a $source $target
[ -n "$mode" ] && chmod $mode $target
fi
done
}
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