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smbios: Add a --linux argument to apply linux modalias-like filtering

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Linux creates modalias strings by filtering out non-ASCII, space,
and colon characters. Provide an option that does the same filtering
so people can create a modalias string in GRUB, and then match their
modalias patterns against it.

Signed-off-by: Julian Andres Klode <julian.klode@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This commit is contained in:
Julian Andres Klode 2020-03-03 16:06:34 +01:00 committed by Daniel Kiper
parent 2e246b6fec
commit 87049f9716
1 changed files with 24 additions and 0 deletions
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24
grub-core/commands/smbios.c
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@ -64,6 +64,21 @@ grub_smbios_get_eps3 (void)
return eps;
}
static char *
linux_string (const char *value)
{
char *out = grub_malloc( grub_strlen (value) + 1);
const char *src = value;
char *dst = out;
for (; *src; src++)
if (*src > ' ' && *src < 127 && *src != ':')
*dst++ = *src;
*dst = 0;
return out;
}
/*
* These functions convert values from the various SMBIOS structure field types
* into a string formatted to be returned to the user. They expect that the
@ -176,6 +191,7 @@ static const struct {
/* List command options, with structure field getters ordered as above. */
#define FIRST_GETTER_OPT (3)
#define SETTER_OPT (FIRST_GETTER_OPT + ARRAY_SIZE(field_extractors))
#define LINUX_OPT (FIRST_GETTER_OPT + ARRAY_SIZE(field_extractors) + 1)
static const struct grub_arg_option options[] = {
{"type", 't', 0, N_("Match structures with the given type."),
@ -198,6 +214,8 @@ static const struct grub_arg_option options[] = {
N_("offset"), ARG_TYPE_INT},
{"set", '\0', 0, N_("Store the value in the given variable name."),
N_("variable"), ARG_TYPE_STRING},
{"linux", '\0', 0, N_("Filter the result like linux does."),
N_("variable"), ARG_TYPE_NONE},
{0, 0, 0, 0, 0, 0}
};
@ -261,6 +279,7 @@ grub_cmd_smbios (grub_extcmd_context_t ctxt,
const grub_uint8_t *structure;
const char *value;
char *modified_value = NULL;
grub_int32_t option;
grub_int8_t field_type = -1;
grub_uint8_t i;
@ -334,12 +353,17 @@ grub_cmd_smbios (grub_extcmd_context_t ctxt,
return grub_error (GRUB_ERR_IO,
N_("failed to retrieve the structure field"));
if (state[LINUX_OPT].set)
value = modified_value = linux_string (value);
/* Store or print the formatted value. */
if (state[SETTER_OPT].set)
grub_env_set (state[SETTER_OPT].arg, value);
else
grub_printf ("%s\n", value);
grub_free(modified_value);
return GRUB_ERR_NONE;
}