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If the default environment variable is unset or invalid (i.e.,
references a non-existent boot option), then GRUB2 will fallback to the
first boot option present. This is preventing petitboot from autobooting
where no default is explicitly set, or is stale.
This change adds this fallback behaviour to petitboot. Because we don't
know if the first option will be a default at parse time (as no other
options matched the default env var), we need to keep options in a list,
and register them with the discover server once the parse is complete.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Currently, the delimiter token handling is a little fragile: we try to
ignore non-inter-word delimiters in the lexer with a selective set of
regexes on the possible delimiter characters.
This means we don't need to handle potential delimiters in every grammar
rule, but there are other situations (not regex-able) where we may see
delimters, and this will cause a parse error.
Instead of relying on the regex behaviour, we have an 'inter_word' flag,
which is set when we see the first word token, and cleared when we see
an end-of-line token. We only emit TOKEN_DELIM when this flag is set.
This means that we only get the delim tokens when they're required -
when we're looking for word separators (becuase WORD DELIM WORD is
distinct from WORD WORD - eg "linux /vmlinux" and "x$var").
We add a few new tests for the "menuentry" and "if" syntax, with
different delimiter configurations.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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GRUB2 syntax allows for for-loops; this change adds supoprt in the
parser grammar and script execution code to implement them. In the
execution code, we simply update the for-loop variable and re-execute
the body statements.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Rather than always using the default prefix, we should determine it from
the location of the grub2 config file.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Allow URL-format specifiers for GRUB2 resources.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Rather than just having one conditional in an if statement, we use a
list of conditionals instead. This allows us to implement elif.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Rather than holding the condition and conditional-statements in struct
grub2_statment_if, create a new conditional type that contains these. We
can then use this to implement elif statements.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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For user-defined functions, we'll need a data pointer to the function's
execution callback. Add this as a void *, and change references from
'command' to 'function'.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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This will allow menuentry-specific commands to populate boot option
data.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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We'll need the context to add boot options.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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If we expand a variable containing word-delimiter chars, we need to
create new argv items.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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.. with a simple 'set' command to update the environment
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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The parser was setting word->next on the top-level word, resulting in
word chains of a maximum length of 2. Instead, use a last pointer to
always append to the last word.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Rather than post-processing to expand variables, use the lexer to
identify variable tokens as a type of grub2_word.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Still todo: splitting.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Now that we can parse scripts, we want some infrastructure for
execution.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Use embedded 'struct grub2_statement' data to create a subclass-style
syntax tree of statements.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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Add a simple flex lexer to tokenise our grub2 config files.
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
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