Allow a dynamic env to override a compiled-in static env by passing in the
override indication in the env data. Submitted by: bde
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=295864
@ -217,6 +217,9 @@ sys_kenv(td, uap)
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* environment obtained from a boot loader, or to provide an empty buffer into
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* which MD code can store an initial environment using kern_setenv() calls.
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*
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* When a copy of an initial environment is passed in, we start by scanning that
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* env for overrides to the compiled-in envmode and hintmode variables.
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*
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* If the global envmode is 1, the environment is initialized from the global
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* static_env[], regardless of the arguments passed. This implements the env
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* keyword described in config(5). In this case env_pos is set to env_len,
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@ -238,6 +241,14 @@ sys_kenv(td, uap)
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void
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init_static_kenv(char *buf, size_t len)
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{
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char *cp;
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for (cp = buf; cp != NULL && cp[0] != '\0'; cp += strlen(cp) + 1) {
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if (strcmp(cp, "static_env.disabled=1") == 0)
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envmode = 0;
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if (strcmp(cp, "static_hints.disabled=1") == 0)
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hintmode = 0;
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}
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if (envmode == 1) {
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kern_envp = static_env;
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