diff --git a/Cargo.lock b/Cargo.lock
index ea33526..d7dc6ac 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -624,6 +624,17 @@ dependencies = [
  "static_assertions",
 ]
 
+[[package]]
+name = "nix"
+version = "0.27.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2eb04e9c688eff1c89d72b407f168cf79bb9e867a9d3323ed6c01519eb9cc053"
+dependencies = [
+ "bitflags 2.3.3",
+ "cfg-if",
+ "libc",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.16.0"
@@ -803,6 +814,7 @@ dependencies = [
  "camino",
  "clap",
  "hex",
+ "nix 0.27.1",
  "rugpi-common",
  "serde",
  "sha1",
@@ -835,7 +847,7 @@ dependencies = [
  "camino",
  "clap",
  "indoc",
- "nix",
+ "nix 0.26.2",
  "rugpi-common",
  "serde",
  "tempdir",
diff --git a/crates/rugpi-bakery/Cargo.toml b/crates/rugpi-bakery/Cargo.toml
index 6d9952b..3c9263c 100644
--- a/crates/rugpi-bakery/Cargo.toml
+++ b/crates/rugpi-bakery/Cargo.toml
@@ -12,6 +12,7 @@ anyhow = "1.0.71"
 camino = { version = "1.1.4", features = ["serde"] }
 clap = { version = "4.3.8", features = ["derive"] }
 hex = "0.4.3"
+nix = { version = "0.27.1", features = ["process"] }
 rugpi-common = { path = "../rugpi-common" }
 serde = { version = "1.0.171", features = ["derive", "rc"] }
 sha1 = "0.10.5"
diff --git a/crates/rugpi-bakery/src/main.rs b/crates/rugpi-bakery/src/main.rs
index a3ab1b6..c199558 100644
--- a/crates/rugpi-bakery/src/main.rs
+++ b/crates/rugpi-bakery/src/main.rs
@@ -1,4 +1,7 @@
-use std::path::PathBuf;
+use std::{
+    ffi::{CStr, CString},
+    path::PathBuf,
+};
 
 use clap::Parser;
 use rugpi_common::Anyhow;
@@ -31,6 +34,8 @@ pub enum Task {
     Customize(CustomizeTask),
     /// Bake a final image for distribution.
     Bake(BakeTask),
+    /// Spawn a shell in the Rugpi Bakery Docker container.
+    Shell,
 }
 
 fn main() -> Anyhow<()> {
@@ -45,6 +50,10 @@ fn main() -> Anyhow<()> {
         Task::Bake(task) => {
             bake::run(&args, task)?;
         }
+        Task::Shell => {
+            let zsh_prog = CString::new("/bin/zsh")?;
+            nix::unistd::execv::<&CStr>(&zsh_prog, &[])?;
+        }
     }
     Ok(())
 }