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fix(cli): allow disabling hostname in sandbox for rootless containers

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This PR introduces a new `setHostname` configuration option (and `GEMINI_CLI_SANDBOX_SET_HOSTNAME` environment variable) to allow disabling the `--hostname` argument when starting Docker or Podman sandboxes.

In rootless nested container environments, attempting to set the hostname can fail if `CAP_SYS_ADMIN` is not available in the ambient capability set. By setting `setHostname: false`, users can bypass this requirement and successfully run the sandbox in such environments.

The setting defaults to `true` to maintain existing behavior and descriptive hostnames in the CLI footer.

Fixes: #26880

cc @danielweis @tommasosciortino
This commit is contained in:
gemini-cli[bot]
2026-05-18 21:48:27 +00:00
parent 792654c88b
commit e4962d9235
8 changed files with 104 additions and 2 deletions
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docs/cli/settings.md
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@@ -131,6 +131,7 @@ they appear in the UI.
| UI Label | Setting | Description | Default |
| -------------------------------- | ------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------- |
| Sandbox Set Hostname | `tools.sandboxSetHostname` | Whether to set the hostname in the sandbox container. Set to false to avoid Mutating UTS namespace, which is required for some rootless container environments. | `true` |
| Sandbox Allowed Paths | `tools.sandboxAllowedPaths` | List of additional paths that the sandbox is allowed to access. | `[]` |
| Sandbox Network Access | `tools.sandboxNetworkAccess` | Whether the sandbox is allowed to access the network. | `false` |
| Enable Interactive Shell | `tools.shell.enableInteractiveShell` | Use node-pty for an interactive shell experience. Fallback to child_process still applies. | `true` |