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24 lines
1.1 KiB
Plaintext
24 lines
1.1 KiB
Plaintext
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Upgrade scripts for specific versions of the config file.
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Each script must define a function `upgrade` that can
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assume `${opt}` and `${val}` variables set on input. On
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output, if `${opt}` is unset - so will be the corresponding
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option.
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One thing to keep in mind is that this script may be invoked
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on full config - or on a defconfig. Do not assume that all
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options will be present! If an option is not specified, use
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the value it had as a default for the fallback; to check if
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it has been specified, use `$selected_opts` associative
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array to check if it has been present in the config file
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(otherwise, you an option not being set after sourcing the
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previous version of the config is ambiguous - it could be
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that the option is called out as `# CT_FOO is not set` (i.e.
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selected as false) or not present at all (i.e. selected as
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default).
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If it is not possible to determine the settings of an option
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because a different controlling option is not set, either
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err out (see CT_LIBC_UCLIBC_CUSTOM in v0 for an example)
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or select a sane default and issue a warning (see CT_GDB_CUSTOM
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in v0 for an example).
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