Remove the is_exec_builder as it is redundant, replace with !init

crates/libcontainer/src/container/builder_impl.rs

@@ -38,8 +38,6 @@ pub(super) struct ContainerBuilderImpl<'a> {
     pub container: Option<Container>,
     /// File descriptos preserved/passed to the container init process.
     pub preserve_fds: i32,
-    /// Denotes if the builder is for the exec call or not
-    pub is_exec_builder: bool,
 }
 
 impl<'a> ContainerBuilderImpl<'a> {
@@ -124,10 +122,8 @@ impl<'a> ContainerBuilderImpl<'a> {
             cgroup_manager: cmanager,
         };
 
-        let (intermediate, init_pid) = process::container_main_process::container_main_process(
-            &container_args,
-            self.is_exec_builder,
-        )?;
+        let (intermediate, init_pid) =
+            process::container_main_process::container_main_process(&container_args, !self.init)?;
 
         // if file to write the pid to is specified, write pid of the child
         if let Some(pid_file) = &self.pid_file {

crates/libcontainer/src/container/init_builder.rs

@@ -87,7 +87,6 @@ impl<'a> InitContainerBuilder<'a> {
             notify_path,
             container: Some(container.clone()),
             preserve_fds: self.base.preserve_fds,
-            is_exec_builder: false,
         };
 
         builder_impl.create()?;

crates/libcontainer/src/container/tenant_builder.rs

@@ -128,7 +128,6 @@ impl<'a> TenantContainerBuilder<'a> {
             notify_path: notify_path.clone(),
             container: None,
             preserve_fds: self.base.preserve_fds,
-            is_exec_builder: true,
         };
 
         let pid = builder_impl.create()?;