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feat: zsh as the default shell #6

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Merged
vitramir merged 1 commit into from
Aug 7, 2026
Merged

feat: zsh as the default shell #6

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19 changes: 17 additions & 2 deletions Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,8 @@ RUN set -eux; \
ca-certificates \
curl \
xz-utils \
gnupg; \
gnupg \
zsh; \
mkdir -p /etc/apt/keyrings; \
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg; \
echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo $VERSION_CODENAME) stable" > /etc/apt/sources.list.d/docker.list; \
Expand All @@ -27,6 +28,19 @@ RUN set -eux; \
# Add profile hook to source Nix in shells and verify
RUN printf '. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh\n' > /etc/profile.d/nix.sh

# zsh is the login shell; SHELL is what a terminal session execs
ENV SHELL=/usr/bin/zsh
RUN set -eux; \
chsh -s /usr/bin/zsh root; \
printf "emulate sh -c 'source /etc/profile'\n" >> /etc/zsh/zprofile; \
printf '%s\n' \
'HISTFILE=~/.zsh_history' \
'HISTSIZE=10000' \
'SAVEHIST=10000' \
'setopt hist_ignore_dups inc_append_history' \
"PROMPT='%n@%m %~ %# '" \
> /root/.zshrc


# Ensure PATH includes Nix binaries for non-login shells as well
ENV PATH=/root/.nix-profile/bin:/nix/var/nix/profiles/default/bin:${PATH}
Expand All @@ -35,8 +49,9 @@ ENV PATH=/root/.nix-profile/bin:/nix/var/nix/profiles/default/bin:${PATH}

# Verify installations
RUN bash -lc '. /etc/profile.d/nix.sh && nix --version && docker --version'
RUN zsh -lc 'nix --version && docker --version'

# Default shell
# Build-time shell for RUN; the runtime default is SHELL=/usr/bin/zsh above
SHELL ["/bin/bash", "-lc"]

# Default CMD
Expand Down
6 changes: 4 additions & 2 deletions README.md
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Expand Up @@ -9,12 +9,14 @@ Included:
- Ubuntu 24.04 base (pinned)
- Nix via Determinate Systems installer (no init/systemd; sandbox disabled)
- Docker CLI from Docker’s apt repository
- zsh as the default shell

Usage:
- Pull: `docker pull ghcr.io/agynio/devcontainer:latest`
- Run: `docker run --rm -it ghcr.io/agynio/devcontainer:latest bash`
- Run: `docker run --rm -it ghcr.io/agynio/devcontainer:latest zsh`

Notes:
- Nix is initialized via `/etc/profile.d/nix.sh` which sources the Nix environment; PATH includes Nix bins.
- zsh is root's login shell and is published as `SHELL=/usr/bin/zsh`, which is what a terminal session execs. `/root/.zshrc` carries history and prompt defaults.
- Nix is initialized via `/etc/profile.d/nix.sh` which sources the Nix environment; PATH includes Nix bins. zsh reaches it through `/etc/zsh/zprofile`, which does not source `/etc/profile` on Ubuntu by default.
- Docker CLI requires access to a running Docker daemon. For local usage, you may mount the host socket: `-v /var/run/docker.sock:/var/run/docker.sock`.
- Verify tools: `nix --version` and `docker --version`.
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