env: delete selected vars not present in imported env
When variables explicitly specified on the command line are not present
in the imported env, delete them from the running env.
If the variable is also missing from the running env, issue a warning.
Signed-off-by: Gerlando Falauto <gerlando.falauto@keymile.com>
Reviewed-by: Marek Vasut <marex@denx.de>
diff --git a/lib/hashtable.c b/lib/hashtable.c
index f3f47de..670a704 100644
--- a/lib/hashtable.c
+++ b/lib/hashtable.c
@@ -607,22 +607,32 @@
* himport()
*/
-/* Check whether variable name is amongst vars[] */
-static int is_var_in_set(const char *name, int nvars, char * const vars[])
+/*
+ * Check whether variable 'name' is amongst vars[],
+ * and remove all instances by setting the pointer to NULL
+ */
+static int drop_var_from_set(const char *name, int nvars, char * vars[])
{
int i = 0;
+ int res = 0;
/* No variables specified means process all of them */
if (nvars == 0)
return 1;
for (i = 0; i < nvars; i++) {
- if (!strcmp(name, vars[i]))
- return 1;
+ if (vars[i] == NULL)
+ continue;
+ /* If we found it, delete all of them */
+ if (!strcmp(name, vars[i])) {
+ vars[i] = NULL;
+ res = 1;
+ }
}
- debug("Skipping non-listed variable %s\n", name);
+ if (!res)
+ debug("Skipping non-listed variable %s\n", name);
- return 0;
+ return res;
}
/*
@@ -665,6 +675,8 @@
int nvars, char * const vars[], int do_apply)
{
char *data, *sp, *dp, *name, *value;
+ char *localvars[nvars];
+ int i;
/* Test for correct arguments. */
if (htab == NULL) {
@@ -681,6 +693,10 @@
memcpy(data, env, size);
dp = data;
+ /* make a local copy of the list of variables */
+ if (nvars)
+ memcpy(localvars, vars, sizeof(vars[0]) * nvars);
+
if ((flag & H_NOCLEAR) == 0) {
/* Destroy old hash table if one exists */
debug("Destroy Hash Table: %p table = %p\n", htab,
@@ -749,7 +765,7 @@
*dp++ = '\0'; /* terminate name */
debug("DELETE CANDIDATE: \"%s\"\n", name);
- if (!is_var_in_set(name, nvars, vars))
+ if (!drop_var_from_set(name, nvars, localvars))
continue;
if (hdelete_r(name, htab, do_apply) == 0)
@@ -769,7 +785,7 @@
++dp;
/* Skip variables which are not supposed to be processed */
- if (!is_var_in_set(name, nvars, vars))
+ if (!drop_var_from_set(name, nvars, localvars))
continue;
/* enter into hash table */
@@ -809,6 +825,24 @@
debug("INSERT: free(data = %p)\n", data);
free(data);
+ /* process variables which were not considered */
+ for (i = 0; i < nvars; i++) {
+ if (localvars[i] == NULL)
+ continue;
+ /*
+ * All variables which were not deleted from the variable list
+ * were not present in the imported env
+ * This could mean two things:
+ * a) if the variable was present in current env, we delete it
+ * b) if the variable was not present in current env, we notify
+ * it might be a typo
+ */
+ if (hdelete_r(localvars[i], htab, do_apply) == 0)
+ printf("WARNING: '%s' neither in running nor in imported env!\n", localvars[i]);
+ else
+ printf("WARNING: '%s' not in imported env, deleting it!\n", localvars[i]);
+ }
+
debug("INSERT: done\n");
return 1; /* everything OK */
}