feat(exec): cgo call to getpwnam and getgrnam

.devcontainer/devcontainer.json

@@ -18,7 +18,8 @@
       "extensions": [
         "golang.go",
         "ms-azuretools.vscode-docker",
-        "ms-vscode.makefile-tools"
+        "ms-vscode.makefile-tools",
+        "ms-vscode.cpptools-extension-pack"
       ]
     }
   }

Makefile

@@ -1,6 +1,6 @@
 
 
-all: wingmate dummy oneshot spawner starter pidproxy
+all: wingmate dummy oneshot spawner starter pidproxy exec
 
 wingmate:
 	$(MAKE) -C cmd/wingmate all

cmd/exec/ent_lin.go

@@ -2,14 +2,50 @@
 
 package main
 
-import (
-	"errors"
-)
+/*
+#include<errno.h>
+#include<string.h>
+#include<sys/types.h>
+#include<pwd.h>
+#include<grp.h>
+
+static uid_t getuid(const char* username) {
+	struct passwd local, *rv;
+	errno = 0;
+	rv = getpwnam(username);
+	if (errno != 0) {
+		return 0;
+	}
+
+	memcpy(&local, rv, sizeof(struct passwd));
+	return local.pw_uid;
+}
+static gid_t getgid(const char* groupname) {
+	struct group local, *rv;
+	errno = 0;
+	rv = getgrnam(groupname);
+	if (errno != 0) {
+		return 0;
+	}
+
+	memcpy(&local, rv, sizeof(struct group));
+	return local.gr_gid;
+}
+*/
+import "C"
 
 func getUid(user string) (uint64, error) {
-	return 0, errors.New("not implemented")
+	u, err := C.getuid(C.CString(user))
+	if err != nil {
+		return 0, err
+	}
+	return uint64(u), nil
 }
 
 func getGid(group string) (uint64, error) {
-	return 0, errors.New("not implemented")
+	g, err := C.getgid(C.CString(group))
+	if err != nil {
+		return 0, err
+	}
+	return uint64(g), nil
 }