refactor: inline sandbox type lookup in process_exec_tool_call (#7122)

`process_exec_tool_call()` was taking `SandboxType` as a param, but in
practice, the only place it was constructed was in
`codex_message_processor.rs` where it was derived from the other
`sandbox_policy` param, so this PR inlines the logic that decides the
`SandboxType` into `process_exec_tool_call()`.



---
[//]: # (BEGIN SAPLING FOOTER)
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with [ReviewStack](https://reviewstack.dev/openai/codex/pull/7122).
* #7112
* __->__ #7122

codex-rs/app-server/src/codex_message_processor.rs

@@ -116,7 +116,6 @@ use codex_core::exec::ExecParams;
 use codex_core::exec_env::create_env;
 use codex_core::features::Feature;
 use codex_core::find_conversation_path_by_id_str;
-use codex_core::get_platform_sandbox;
 use codex_core::git_info::git_diff_to_remote;
 use codex_core::parse_cursor;
 use codex_core::protocol::EventMsg;
@@ -1182,13 +1181,6 @@ impl CodexMessageProcessor {
             .sandbox_policy
             .unwrap_or_else(|| self.config.sandbox_policy.clone());
 
-        let sandbox_type = match &effective_policy {
-            codex_core::protocol::SandboxPolicy::DangerFullAccess => {
-                codex_core::exec::SandboxType::None
-            }
-            _ => get_platform_sandbox().unwrap_or(codex_core::exec::SandboxType::None),
-        };
-        tracing::debug!("Sandbox type: {sandbox_type:?}");
         let codex_linux_sandbox_exe = self.config.codex_linux_sandbox_exe.clone();
         let outgoing = self.outgoing.clone();
         let req_id = request_id;
@@ -1197,7 +1189,6 @@ impl CodexMessageProcessor {
         tokio::spawn(async move {
             match codex_core::exec::process_exec_tool_call(
                 exec_params,
-                sandbox_type,
                 &effective_policy,
                 sandbox_cwd.as_path(),
                 &codex_linux_sandbox_exe,

codex-rs/core/src/exec.rs

@@ -19,6 +19,7 @@ use tokio_util::sync::CancellationToken;
 use crate::error::CodexErr;
 use crate::error::Result;
 use crate::error::SandboxErr;
+use crate::get_platform_sandbox;
 use crate::protocol::Event;
 use crate::protocol::EventMsg;
 use crate::protocol::ExecCommandOutputDeltaEvent;
@@ -127,12 +128,17 @@ pub struct StdoutStream {
 
 pub async fn process_exec_tool_call(
     params: ExecParams,
-    sandbox_type: SandboxType,
     sandbox_policy: &SandboxPolicy,
     sandbox_cwd: &Path,
     codex_linux_sandbox_exe: &Option<PathBuf>,
     stdout_stream: Option<StdoutStream>,
 ) -> Result<ExecToolCallOutput> {
+    let sandbox_type = match &sandbox_policy {
+        SandboxPolicy::DangerFullAccess => SandboxType::None,
+        _ => get_platform_sandbox().unwrap_or(SandboxType::None),
+    };
+    tracing::debug!("Sandbox type: {sandbox_type:?}");
+
     let ExecParams {
         command,
         cwd,
@@ -893,7 +899,6 @@ mod tests {
         });
         let result = process_exec_tool_call(
             params,
-            SandboxType::None,
             &SandboxPolicy::DangerFullAccess,
             cwd.as_path(),
             &None,

codex-rs/core/tests/suite/exec.rs

@@ -41,7 +41,7 @@ async fn run_test_cmd(tmp: TempDir, cmd: Vec<&str>) -> Result<ExecToolCallOutput
 
     let policy = SandboxPolicy::new_read_only_policy();
 
-    process_exec_tool_call(params, sandbox_type, &policy, tmp.path(), &None, None).await
+    process_exec_tool_call(params, &policy, tmp.path(), &None, None).await
 }
 
 /// Command succeeds with exit code 0 normally

codex-rs/exec-server/src/posix/escalate_server.rs

@@ -8,9 +8,7 @@ use std::time::Duration;
 use anyhow::Context as _;
 use path_absolutize::Absolutize as _;
 
-use codex_core::exec::SandboxType;
 use codex_core::exec::process_exec_tool_call;
-use codex_core::get_platform_sandbox;
 use codex_core::protocol::SandboxPolicy;
 use tokio::process::Command;
 use tokio_util::sync::CancellationToken;
@@ -96,7 +94,6 @@ impl EscalateServer {
                 justification: None,
                 arg0: None,
             },
-            get_platform_sandbox().unwrap_or(SandboxType::None),
             &sandbox_policy,
             &sandbox_cwd,
             &None,

codex-rs/linux-sandbox/tests/suite/landlock.rs

@@ -3,7 +3,6 @@ use codex_core::config::types::ShellEnvironmentPolicy;
 use codex_core::error::CodexErr;
 use codex_core::error::SandboxErr;
 use codex_core::exec::ExecParams;
-use codex_core::exec::SandboxType;
 use codex_core::exec::process_exec_tool_call;
 use codex_core::exec_env::create_env;
 use codex_core::protocol::SandboxPolicy;
@@ -60,7 +59,6 @@ async fn run_cmd(cmd: &[&str], writable_roots: &[PathBuf], timeout_ms: u64) {
     let codex_linux_sandbox_exe = Some(PathBuf::from(sandbox_program));
     let res = process_exec_tool_call(
         params,
-        SandboxType::LinuxSeccomp,
         &sandbox_policy,
         sandbox_cwd.as_path(),
         &codex_linux_sandbox_exe,
@@ -155,7 +153,6 @@ async fn assert_network_blocked(cmd: &[&str]) {
     let codex_linux_sandbox_exe: Option<PathBuf> = Some(PathBuf::from(sandbox_program));
     let result = process_exec_tool_call(
         params,
-        SandboxType::LinuxSeccomp,
         &sandbox_policy,
         sandbox_cwd.as_path(),
         &codex_linux_sandbox_exe,