Hi, Here is a seires of value-override operator support for bootconfig.
Currently, the bootconfig syntax supports normal assignment operator ("=") and value append operator ("+="), but there is no way to override (or update) existing value. This patch adds the value override operator (":=") to update the existing value with another value. For example, key.word = value1 key.word := value2, value3 In this case, the 2nd "key.word" config overwrites the 1st one. Thus this is equal to; key.word = value2, value3 Note that it is still not allowed to override a subkey with a value, and a value with a subkey. This means the following case is not allowed. key.word = value1 key := value2 # Error! With this change, if the bootloader wants to change some value in the default bootconfig, it doesn't need to parse the existing bootconfig, but it can just append the new configs at the tail of the bootconfig and update the footer (size, checksum and magic word). Thank you, --- Masami Hiramatsu (3): lib/bootconfig: Add override operator support tools/bootconfig: Add testcases for value override operator Documentation: bootconfig: Add bootconfig override operator Documentation/admin-guide/bootconfig.rst | 11 +++++++++ lib/bootconfig.c | 33 ++++++++++++++++++-------- tools/bootconfig/samples/bad-override.bconf | 3 ++ tools/bootconfig/samples/bad-override2.bconf | 3 ++ tools/bootconfig/samples/good-override.bconf | 6 +++++ tools/bootconfig/test-bootconfig.sh | 13 ++++++++++ 6 files changed, 59 insertions(+), 10 deletions(-) create mode 100644 tools/bootconfig/samples/bad-override.bconf create mode 100644 tools/bootconfig/samples/bad-override2.bconf create mode 100644 tools/bootconfig/samples/good-override.bconf -- Masami Hiramatsu (Linaro) <mhira...@kernel.org>