veyron/lib/flags,veyron/lib/exec: pipe parent config opts to child's flags parse
This change adds a way to override flags in the child via the parent config object passed through the vanadium exec mechanism.
Specifically, lib/flags.Parse gets a new argument (config), which overrides/adds
flag values after parsing the command-line args. The runtime grabs the config from the exec handle and passes it to Parse.
Sundry test cases to test the new logic added.
Change-Id: Ied173b770e375d6d36e5de8076219e20bd682fba
diff --git a/lib/exec/config.go b/lib/exec/config.go
index aae2c26..52c622f 100644
--- a/lib/exec/config.go
+++ b/lib/exec/config.go
@@ -38,6 +38,8 @@
// values for keys that already exist and creating new key-value pairs
// for keys that don't.
MergeFrom(string) error
+ // Dump returns the config information as a map from ket to value.
+ Dump() map[string]string
}
type cfg struct {
@@ -66,6 +68,16 @@
return v, nil
}
+func (c cfg) Dump() (res map[string]string) {
+ res = make(map[string]string)
+ c.RLock()
+ defer c.RUnlock()
+ for k, v := range c.m {
+ res[k] = v
+ }
+ return
+}
+
func (c cfg) Clear(key string) {
c.Lock()
defer c.Unlock()
