devcontainer: add optional worktrees mount#3541
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Add an optional `DZ_WORKTREES_DIR` mount that exposes a host worktrees directory at /workspaces/worktrees inside the container. Useful when using `docker exec` to run builds in the persistent dev container while working on git worktrees outside the repo checkout. Defaults to /tmp/worktrees (created by initializeCommand) when the env var is unset, so the mount is a harmless no-op for devs who don't use it.
snormore
approved these changes
Apr 16, 2026
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Summary
DZ_WORKTREES_DIRhost env var that mounts a worktrees directory at/workspaces/worktreesinside the dev container, sodocker execworkflows can reach git worktrees stored outside the main repo checkout/tmp/worktrees(created byinitializeCommand) when the env var is unset — harmless empty mount for devs who don't opt inresolveShellEnvpicks up the env var from shell rcMotivation
The persistent dev container (
dz-dev-workspace-vsc) is used viadocker execfor Linux builds. Worktrees kept in a global location (e.g.~/projects/worktrees/) are not visible inside the container without a mount, so switching between worktrees required constant rebuilds or host-side tooling.Opt-in
Add one line to your shell rc:
Then rebuild the dev container. Your worktrees appear at
/workspaces/worktrees/inside the container, mirroring the host layout.Testing Verification
DZ_WORKTREES_DIRset; confirmed mount source resolves to$HOME/projects/worktreesviadocker inspect/workspaces/worktrees/shows host worktrees content/tmp/worktrees, created byinitializeCommandresolveShellEnv