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authorPatrick Ohly <patrick.ohly@intel.com>2015-04-13 08:44:38 -0700
committerRichard Purdie <richard.purdie@linuxfoundation.org>2015-04-24 11:05:58 +0100
commitae4d605d802edb4c8bdb2dbee1b0c36d7730c07f (patch)
tree1564e1767173c2d5640d9d1b7a4fb5422536cb2f
parentc520165f8fe7c01865ddb2565908211c0cfd2185 (diff)
downloadopenembedded-core-contrib-ae4d605d802edb4c8bdb2dbee1b0c36d7730c07f.tar.gz
rootfsdebugfiles.bbclass: quick-and-dirty installation of additional files
The main motivation for this class was the observation that a) a core-image can hang under qemu when the kernel does not have enough entropy to generate the ssh host key b) ssh complains about changing ssh host key files when rebooting the same machine with different images For debugging it is okay to reuse an ssh host key generated on the device before. There may be also similar use cases, so the class is generic enough to also copy more than one file or directory, with dropbear_rsa_host_key given as example. The documentation and naming of the class makes it clear that it should not be used for production images. Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
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diff --git a/meta/classes/rootfsdebugfiles.bbclass b/meta/classes/rootfsdebugfiles.bbclass
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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 ${IMAGE_ROOTFS}/etc/dropbear/dropbear_rsa_host_key ;"
+# 2. Boot the image once, copy the dropbear_rsa_host_key from
+# the device into your build conf directory.
+#
+# Do not use for production images! It bypasses several
+# core build mechanisms (updating the image when one
+# of the files changes, license tracking in the image
+# manifest, ...).
+
+ROOTFS_DEBUG_FILES ?= ""
+ROOTFS_DEBUG_FILES[doc] = "Lists additional files or directories to be installed with 'cp -a' in the format 'source1 target1;source2 target2;...'"
+
+ROOTFS_POSTPROCESS_COMMAND += "rootfs_debug_files ;"
+rootfs_debug_files () {
+ #!/bin/sh -e
+ echo "${ROOTFS_DEBUG_FILES}" | sed -e 's/;/\n/g' | while read source target; do
+ if [ -e "$source" ]; then
+ mkdir -p $(dirname $target)
+ cp -a $source $target
+ fi
+ done
+}