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Allow a dynamic env to override a compiled-in static env by passing in the

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override indication in the env data.

Submitted by:	bde
This commit is contained in:
Ian Lepore 2016-02-21 18:35:01 +00:00
parent 37d65816e1
commit 85143dd18d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=295864
1 changed files with 11 additions and 0 deletions
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11
sys/kern/kern_environment.c
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@ -217,6 +217,9 @@ sys_kenv(td, uap)
* environment obtained from a boot loader, or to provide an empty buffer into
* which MD code can store an initial environment using kern_setenv() calls.
*
* When a copy of an initial environment is passed in, we start by scanning that
* env for overrides to the compiled-in envmode and hintmode variables.
*
* If the global envmode is 1, the environment is initialized from the global
* static_env[], regardless of the arguments passed. This implements the env
* keyword described in config(5). In this case env_pos is set to env_len,
@ -238,6 +241,14 @@ sys_kenv(td, uap)
void
init_static_kenv(char *buf, size_t len)
{
char *cp;
for (cp = buf; cp != NULL && cp[0] != '\0'; cp += strlen(cp) + 1) {
if (strcmp(cp, "static_env.disabled=1") == 0)
envmode = 0;
if (strcmp(cp, "static_hints.disabled=1") == 0)
hintmode = 0;
}
if (envmode == 1) {
kern_envp = static_env;