[U-Boot] [RFC PATCH 4/7] env: Introduce "transient" and "system" access flags

[Bernhard Nortmann]

"transient" (='t') is like "any", but requests that a variable
should not be exported (ENV_FLAGS_VARACCESS_PREVENT_EXPORT).

"system" (='S') is meant for 'internal' variables that
aren't supposed to be changed by the user. It corresponds
to "transient" plus "read-only".

Signed-off-by: Bernhard Nortmann <bernhard.nortmann at web.de>
---

 common/env_flags.c  | 11 +++++++++--
 include/env_flags.h |  2 ++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/common/env_flags.c b/common/env_flags.c
index f39d952..2c30c7f 100644
--- a/common/env_flags.c
+++ b/common/env_flags.c
@@ -28,7 +28,7 @@
 #endif
 
 static const char env_flags_vartype_rep[] = "sdxb" ENV_FLAGS_NET_VARTYPE_REPS;
-static const char env_flags_varaccess_rep[] = "aroc";
+static const char env_flags_varaccess_rep[] = "aroctS";
 static const int env_flags_varaccess_mask[] = {
 	0,
 	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
@@ -37,7 +37,12 @@ static const int env_flags_varaccess_mask[] = {
 	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
 		ENV_FLAGS_VARACCESS_PREVENT_OVERWR,
 	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
-		ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR};
+		ENV_FLAGS_VARACCESS_PREVENT_NONDEF_OVERWR,
+	ENV_FLAGS_VARACCESS_PREVENT_EXPORT,
+	ENV_FLAGS_VARACCESS_PREVENT_DELETE |
+		ENV_FLAGS_VARACCESS_PREVENT_CREATE |
+		ENV_FLAGS_VARACCESS_PREVENT_OVERWR |
+		ENV_FLAGS_VARACCESS_PREVENT_EXPORT};
 
 #ifdef CONFIG_CMD_ENV_FLAGS
 static const char * const env_flags_vartype_names[] = {
@@ -55,6 +60,8 @@ static const char * const env_flags_varaccess_names[] = {
 	"read-only",
 	"write-once",
 	"change-default",
+	"transient",	/* do not export/save */
+	"system",	/* = "transient" plus "read-only" */
 };
 
 /*
diff --git a/include/env_flags.h b/include/env_flags.h
index 7e2362a..9997a25 100644
--- a/include/env_flags.h
+++ b/include/env_flags.h
@@ -25,6 +25,8 @@ enum env_flags_varaccess {
 	env_flags_varaccess_readonly,
 	env_flags_varaccess_writeonce,
 	env_flags_varaccess_changedefault,
+	env_flags_varaccess_transient,
+	env_flags_varaccess_locked,
 	env_flags_varaccess_end
 };
 
-- 
2.7.3