CmdBridge: Filter out invalid environment entries

For some reason the os.Environ() would include entries like:
` =/tmp/_qtc_cmdbridge`. Those did break the linuxdevice
fullLocalCommandLine().

We now filter them out both in the bridge and the device.

Change-Id: If1ab6b6b762edbc402d095500e91b3689deaed73
Reviewed-by: hjk <hjk@qt.io>

src/libs/gocmdbridge/server/cmdbridge.go

@@ -11,6 +11,8 @@ import (
 	"path/filepath"
 	"reflect"
 	"runtime"
+	"slices"
+	"strings"
 	"sync"
 	"syscall"
 
@@ -402,7 +404,12 @@ func processCommand(watcher *WatcherHandler, cmd command, out chan<- []byte) {
 
 
 func sendEnvironment(out chan<- []byte) {
-	env := os.Environ()
+	// Delete all entries without a valid key.
+	env := slices.DeleteFunc(os.Environ(), func(s string) bool {
+		trimmed := strings.TrimSpace(s)
+		return len(trimmed) == 0 || trimmed[0] == '='
+	})
+
 	result, _ := cbor.Marshal(environment{
 		Type: "environment",
 		Id: -1,

src/plugins/remotelinux/linuxdevice.cpp

@@ -826,7 +826,7 @@ CommandLine SshProcessInterfacePrivate::fullLocalCommandLine() const
 
     const Environment &env = q->m_setup.m_environment;
     env.forEachEntry([&](const QString &key, const QString &value, bool enabled) {
-        if (enabled)
+        if (enabled && !key.trimmed().isEmpty())
             inner.addArgs(key + "='" + env.expandVariables(value) + '\'', CommandLine::Raw);
     });