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fix(job): Deduplicate env var names on Windows

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Windows handles environment variable names case-insensitively (i.e.,
%Path% can be accessed via %PATH%).  Since nvim explicitly creates the
environment block for jobs, we need to ensure it doesn't contain
duplicate names with different cases (e.g., both %Path% and %PATH%) as
that can confuse processes using the environment.

`f_environ()` now converts all env var names to upper-case on Windows,
since it does duplicate detection and also provides the base environment
for jobs.  Similarly, `create_environment()` converts any env var names
supplied in the job opts to upper-case so they can be compared against
what we get from `f_environ()`.

Closes #14541
This commit is contained in:
James McCoy
2021-05-18 06:54:24 -04:00
parent d250905c69
commit 88ee095d42
1 changed files with 31 additions and 2 deletions
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33
src/nvim/eval/funcs.c
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@@ -1850,15 +1850,30 @@ static void f_environ(typval_T *argvars, typval_T *rettv, FunPtr fptr)
ptrdiff_t len = end - str;
assert(len > 0);
const char * value = str + len + 1;
if (tv_dict_find(rettv->vval.v_dict, str, len) != NULL) {
char c = env[i][len];
env[i][len] = NUL;
#ifdef WIN32
// Upper-case all the keys for Windows so we can detect duplicates
char *const key = strcase_save(str, true);
#else
char *const key = xstrdup(str);
#endif
env[i][len] = c;
if (tv_dict_find(rettv->vval.v_dict, key, len) != NULL) {
// Since we're traversing from the end of the env block to the front, any
// duplicate names encountered should be ignored. This preserves the
// semantics of env vars defined later in the env block taking precedence.
xfree(key);
continue;
}
tv_dict_add_str(rettv->vval.v_dict,
str, len,
key, len,
value);
xfree(key);
}
os_free_fullenv(env);
}
@@ -5096,7 +5111,21 @@ static dict_T *create_environment(const dictitem_T *job_env,
}
if (job_env) {
#ifdef WIN32
TV_DICT_ITER(job_env->di_tv.vval.v_dict, var, {
// Always use upper-case keys for Windows so we detect duplicate keys
char *const key = strcase_save((const char *)var->di_key, true);
size_t len = strlen(key);
dictitem_T *dv = tv_dict_find(env, key, len);
if (dv) {
tv_dict_item_remove(env, dv);
}
tv_dict_add_str(env, key, len, tv_get_string(&var->di_tv));
xfree(key);
});
#else
tv_dict_extend(env, job_env->di_tv.vval.v_dict, "force");
#endif
}
if (pty) {