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