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rootfs-postcommands.bbclass: ensure that rootfs gets mounted ro

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When read-only-rootfs is active, we need to ensure that the rootfs
does not get mounted read/write by the kernel or initramfs. Adding
"ro" to the boot parameters achieves that.

(From OE-Core rev: cfc09de06ecc12bb42181004689e881c75072665)

Signed-off-by: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Patrick Ohly
2017-11-27 16:56:42 +01:00
committed by Richard Purdie
parent e9e3e60ca6
commit 10865f77b9
1 changed files with 8 additions and 0 deletions
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8
meta/classes/rootfs-postcommands.bbclass
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@@ -14,6 +14,14 @@ ROOTFS_POSTPROCESS_COMMAND += "rootfs_update_timestamp ; "
# Tweak the mount options for rootfs in /etc/fstab if read-only-rootfs is enabled
ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "read-only-rootfs", "read_only_rootfs_hook; ", "",d)}'
# We also need to do the same for the kernel boot parameters,
# otherwise kernel or initramfs end up mounting the rootfs read/write
# (the default) if supported by the underlying storage.
#
# We do this with _append because the default value might get set later with ?=
# and we don't want to disable such a default that by setting a value here.
APPEND_append = '${@bb.utils.contains("IMAGE_FEATURES", "read-only-rootfs", " ro", "", d)}'
# Generates test data file with data store variables expanded in json format
ROOTFS_POSTPROCESS_COMMAND += "write_image_test_data ; "