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env: Add option to only ever append environment

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Add configuration option which prevents the environment hash table to be
ever cleared and reloaded with different content. This is useful in case
the first environment loaded into the hash table contains e.g. sensitive
content which must not be dropped or reloaded.

Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Marek Vasut
2020-07-07 20:51:38 +02:00
committed by Tom Rini
parent 890feecaab
commit 47f3b1f243
3 changed files with 15 additions and 0 deletions
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4
lib/hashtable.c
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@@ -826,6 +826,10 @@ int himport_r(struct hsearch_data *htab,
if (nvars)
memcpy(localvars, vars, sizeof(vars[0]) * nvars);
#if CONFIG_IS_ENABLED(ENV_APPEND)
flag |= H_NOCLEAR;
#endif
if ((flag & H_NOCLEAR) == 0 && !nvars) {
/* Destroy old hash table if one exists */
debug("Destroy Hash Table: %p table = %p\n", htab,