release: v2.4.0 — nano + micro editors, CI hardening, opencode 1.17.10 → 1.17.13

Promotes the Unreleased block to v2.4.0. Bundled contents:
- feat: nano + micro non-modal editors (d9ad634) — Dockerfile.base change → base rebuild
- ci: sh-vs-bash guard + base-latest digest promote, ported from pi-devbox (acb2096)
- feat: global gitignore baked into the image (6639ba5)
- opencode 1.17.10 → 1.17.13 (Dockerfile.variant)

Also registers .gitea/workflows/lint.yml in AGENTS.md's workflow list.
DOCKER_HUB.md unchanged (HUB_TEMPLATE untouched; --check passes).
Pre-flight: opencode-ai@1.17.13 confirmed on npm (== latest).

.gitea/workflows/docker-publish-split.yml

@@ -34,6 +34,17 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: false
 
+# Gitea Actions' default step shell is `sh -e {0}` (dash), which rejects
+# bash-only syntax like `set -o pipefail`, `[[ ]]`, and arrays. Setting the
+# default to bash workflow-wide eliminates the whole class of "forgot
+# `shell: bash` on this step" bugs. (Ported from pi-devbox, where this class
+# bit twice: ed49b8d resolve-versions, b7197e8/b33e9dc promote-base-latest,
+# run 418.) All existing dash steps use only POSIX syntax, so bash (a
+# superset) runs them unchanged. Enforced by lint.yml's shell guard.
+defaults:
+  run:
+    shell: bash
+
 env:
   BUILDKIT_PROGRESS: plain
   IMAGE: ${{ vars.DOCKERHUB_USERNAME }}/opencode-devbox
@@ -519,11 +530,16 @@ jobs:
       - base-decide
       - build-variant-base
       - build-variant-omos
-    # Skip on cache-hit base builds: when need_build=false, base-latest
-    # already points at the same digest as base-<hash>, so the retag is
-    # a tautology and any transient failure of it is purely cosmetic.
-    # Manual workflow_dispatch with promote_latest=true overrides this
-    # gate as an escape hatch (e.g., if base-latest got hand-deleted).
+    # Run on every tag release (and promote_latest=true dispatch). The gate
+    # deliberately does NOT key off need_build anymore: the no-op optimization
+    # for genuine cache-hit releases moved INTO the step as a crane digest
+    # compare (see below). Keying the gate on need_build was wrong because a
+    # prior dry-run dispatch (promote_latest=false) can pre-build+push
+    # base-<hash>, making need_build=false on the subsequent tag run even
+    # though base-latest is still stale — the old gate then skipped promotion
+    # and left base-latest pointing at the PREVIOUS base. (Ported from
+    # pi-devbox b7197e8, which hit exactly this on its v1.2.3 dry-run-first
+    # release, 2026-06-27.)
     #
     # `always()` wrapper + explicit base-variant success check protects
     # against the gitea-Actions default of "skipped need => skip dependent":
@@ -532,8 +548,7 @@ jobs:
     if: |
       always() &&
       needs.build-variant-base.result == 'success' &&
-      (inputs.promote_latest == 'true' ||
-       (github.ref_type == 'tag' && needs.base-decide.outputs.need_build == 'true'))
+      (inputs.promote_latest == 'true' || github.ref_type == 'tag')
     runs-on: ubuntu-latest
     container:
       image: catthehacker/ubuntu:act-latest
@@ -558,11 +573,31 @@ jobs:
           crane auth login docker.io \
             -u ${{ vars.DOCKERHUB_USERNAME }} \
             -p "${{ secrets.DOCKERHUB_TOKEN }}"
-      - name: Re-tag base-<hash> as base-latest
+      - name: Re-tag base-<hash> as base-latest (only if stale)
+        env:
+          BASE_HASH_REF: ${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }}
+          BASE_LATEST_REF: ${{ env.IMAGE }}:base-latest
         run: |
-          crane copy \
-            ${{ env.IMAGE }}:${{ needs.base-decide.outputs.base_tag }} \
-            ${{ env.IMAGE }}:base-latest
+          set -euo pipefail
+          # Correctness invariant: after a release, base-latest must resolve to
+          # the SAME digest as the base-<hash> the just-built variants were
+          # FROM. Compare digests rather than trusting need_build — a prior
+          # dry-run dispatch can pre-build base-<hash>, so need_build=false on
+          # the tag run does NOT imply base-latest is already current. When the
+          # digests already match (genuine cache-hit release) this is a no-op,
+          # so we skip the crane copy entirely — preserving the original
+          # "don't do a tautological retag" intent and avoiding any cosmetic
+          # transient-failure exposure on releases that change nothing.
+          want=$(crane digest "${BASE_HASH_REF}")
+          have=$(crane digest "${BASE_LATEST_REF}" 2>/dev/null || echo "")
+          echo "base-<hash> digest: ${want}"
+          echo "base-latest digest: ${have:-<absent>}"
+          if [ "${want}" = "${have}" ]; then
+            echo "base-latest already current; nothing to promote."
+          else
+            echo "Promoting base-latest -> ${BASE_HASH_REF}"
+            crane copy "${BASE_HASH_REF}" "${BASE_LATEST_REF}"
+          fi
 
   # ── Phase 6: update Hub description (only on real release runs) ────
   update-description:

.gitea/workflows/lint.yml

@@ -0,0 +1,68 @@
+name: Lint workflows
+
+# Durable guard against CI-workflow bugs — most importantly the "bash-only
+# syntax under the default `sh`/dash shell" footgun. Ported from pi-devbox,
+# where this class broke resolve-versions (ed49b8d) and promote-base-latest
+# (b7197e8 → run 418). actionlint runs shellcheck against each `run:` step
+# using its *effective* shell, so `set -o pipefail` under dash is flagged as
+# SC3040 before any expensive build runs. This is cheap (~10s) and independent
+# of the build pipeline, so it fires on every push/PR — not just on release
+# tags, which is where docker-publish-split.yml is otherwise only triggered.
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+concurrency:
+  group: lint-${{ github.ref }}
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    container:
+      image: catthehacker/ubuntu:act-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install shellcheck
+        run: |
+          apt-get update
+          apt-get install -y --no-install-recommends shellcheck python3-yaml
+
+      - name: Gitea shell guard (catches the actionlint blind spot)
+        # actionlint models GitHub Actions, where the default run shell is
+        # bash, so it does NOT flag bash syntax in a step that merely OMITS
+        # `shell:` — which is exactly how ed49b8d and b7197e8 manifested on
+        # Gitea (default sh/dash). This guard enforces that every run: step
+        # resolves to bash under Gitea's real defaults. Run it BEFORE
+        # actionlint so the more precise diagnostic surfaces first.
+        run: bash scripts/check-workflow-shell.sh .gitea/workflows
+
+      - name: Install actionlint (pinned)
+        env:
+          ACTIONLINT_VERSION: 1.7.7
+        run: |
+          curl -fsSL \
+            "https://github.com/rhysd/actionlint/releases/download/v${ACTIONLINT_VERSION}/actionlint_${ACTIONLINT_VERSION}_linux_amd64.tar.gz" \
+            | tar -xz -C /usr/local/bin actionlint
+          actionlint --version
+
+      - name: Run actionlint
+        # SHELLCHECK_OPTS excludes pure-style codes (quoting/style opinions)
+        # so the guard stays focused on correctness bugs — crucially the
+        # SC3xxx "not POSIX / wrong shell" family that catches the pipefail
+        # footgun. Do NOT exclude SC3040 (set -o pipefail under sh) or any
+        # other SC3xxx code.
+        env:
+          SHELLCHECK_OPTS: "-e SC2086 -e SC2016 -e SC2129 -e SC2001 -e SC2312"
+        # Pass explicit paths: actionlint's no-arg mode auto-detects a
+        # project by looking for `.github/workflows`, which doesn't exist in
+        # this `.gitea/workflows` repo and hard-fails with exit 3
+        # ("no project was found"). Globbing the workflow files is the
+        # supported way to lint a non-GitHub layout.
+        run: actionlint -color .gitea/workflows/*.yml

.gitea/workflows/validate.yml

@@ -35,6 +35,14 @@ on:
     branches:
       - main
 
+# Gitea Actions' default step shell is `sh` (dash); force bash workflow-wide so
+# no run: step silently falls through to dash. Enforced by lint.yml's
+# scripts/check-workflow-shell.sh guard, which scans ALL .gitea/workflows/*.yml
+# (so this file must resolve to bash too, not just docker-publish-split.yml).
+defaults:
+  run:
+    shell: bash
+
 jobs:
   docs-check:
     # Fails if DOCKER_HUB.md is out of sync with what generate-dockerhub-md.py

AGENTS.md

@@ -29,6 +29,7 @@ Docker image packaging [opencode](https://opencode.ai) into a production-ready d
 - `.gitea/README.md` — **read this first** if you're touching CI. Architectural overview of the build pipeline (production vs split-base), wall-clock estimates, NPM_CONFIG_PREFIX gotcha, runner expectations, migration plan.
 - `.gitea/workflows/validate.yml` — lightweight amd64 build + smoke test on push to main and PRs. Also runs the DOCKER_HUB.md sync check.
 - `.gitea/workflows/docker-publish-split.yml` — production CI pipeline on tag push (`v*`). Two-phase split-base: computes base hash, conditionally builds base, runs 2 parallel smoke tests, then 2 parallel multi-arch variant builds, promotes `base-latest` alias, updates Docker Hub description.
+- `.gitea/workflows/lint.yml` — cheap (~10s) workflow-lint on every push/PR/dispatch: a Gitea-accurate shell guard (`scripts/check-workflow-shell.sh`) plus pinned actionlint + shellcheck. The guard asserts every `run:` step resolves to `bash` under Gitea's `sh` default, closing the actionlint blind spot (actionlint models GitHub, whose default `run` shell is bash). Ported from pi-devbox.
 
 ## Versioning scheme
 

CHANGELOG.md

@@ -6,6 +6,86 @@ Tags follow **independent semver** (since `v2.0.0`) — they version *this image
 
 ---
 
+## v2.4.0 — 2026-07-01
+
+Minor release. Adds two **non-modal editors** (`nano` + `micro`) alongside
+nvim, ports **CI hardening** from pi-devbox (the sh-vs-bash workflow guard and
+the `base-latest` digest-based promote fix), bakes a **global gitignore** into
+the image, and bumps **opencode `1.17.10` → `1.17.13`**. Because
+`Dockerfile.base` changed (nano + micro), this release rebuilds the base image.
+
+### Changed
+
+- **opencode `1.17.10` → `1.17.13`** (three upstream patches). Highlights:
+  session snapshots + revert controls (1.17.11); MCP OAuth reconnect/refresh
+  fixes, a TUI yolo auto-approve mode, and better default small models
+  (1.17.12); forced reasoning mode for OpenAI-compatible reasoning models plus
+  a GitHub Copilot stale-response-ID fix (1.17.13). Full notes:
+  <https://github.com/anomalyco/opencode/releases>.
+
+### Added
+
+- **Global gitignore baked into the image.** A `~/.gitignore_global`
+  (`*.bak`, `*.bak.*`, `*~`, `*.orig`, `*.swp`, `*.tmp`) is seeded into the home
+  dir from `/etc/skel-devbox/` on first boot (seed-if-absent, like
+  `.bash_aliases`/`.inputrc`, so user edits survive recreate) and wired via
+  `git config --global core.excludesFile`. Personal/tooling backup artifacts are
+  now ignored across all repos in the container without per-repo `.gitignore`
+  entries. The `core.excludesFile` wiring is skipped if the user already set one.
+
+- **Non-modal editors `nano` + `micro` alongside `nvim`.** The image shipped
+  only nvim (`EDITOR=nvim`), a modal vi-style editor. Added both a classic and
+  a modern non-modal option for users who don't want vi keybindings:
+  - **nano** (apt): ~2.8 MB installed; its deps (libc6, libncursesw6,
+    libtinfo6) are already present via nvim/less/htop/tmux, so no extra
+    packages are pulled in.
+  - **micro**: ~12 MB single static Go binary from GitHub releases (same
+    pattern as bat/eza/zoxide). Desktop-style keys (Ctrl+S/Ctrl+Q), mouse,
+    syntax highlighting. `ARG MICRO_VERSION` pins; defaults to latest.
+
+  Combined ~15 MB (<0.5% of the image). `EDITOR` stays `nvim`; both are opt-in
+  (`export EDITOR=micro | nano`). Uses the canonical `micro-editor/micro` URL
+  because the old `zyedidia/micro` org rename makes `/releases/latest` redirect
+  to another `/latest`, defeating the tag-parsing latest-resolution idiom.
+  Base-image change, so it lands on the next `base-<hash>` rebuild. Ported from
+  pi-devbox 3a59e15.
+
+- **Workflow-lint guard (`.gitea/workflows/lint.yml` + `scripts/check-workflow-shell.sh`).**
+  New cheap (~10s) lint workflow that runs on every push/PR (not just release
+  tags): a Gitea-accurate shell guard plus pinned `actionlint` + `shellcheck`.
+  The custom guard asserts every `run:` step in every `.gitea/workflows/*.yml`
+  resolves to an effective shell of `bash`, closing the actionlint blind spot
+  (actionlint models GitHub, whose default `run` shell is bash, so it does not
+  flag bash syntax in a step that merely omits `shell:` — the exact way the
+  sh-vs-bash footgun manifests on Gitea, whose default is `sh`/dash). Ported
+  from pi-devbox.
+
+### Changed (CI)
+
+- **Workflow-wide `defaults: run: shell: bash`** added to
+  `docker-publish-split.yml` and `validate.yml`. Gitea Actions' default step
+  shell is `sh` (dash), so bash-only syntax (`set -o pipefail`, `[[ ]]`,
+  arrays) in a step that forgets `shell: bash` fails silently. Setting the
+  default workflow-wide eliminates the whole class. All pre-existing steps use
+  only POSIX syntax, so bash (a superset) runs them unchanged — no behavioural
+  change. Preventive port from pi-devbox, where this class bit twice.
+
+### Fixed (CI)
+
+- **`promote-base-latest` re-points `base-latest` by digest, not `need_build`.**
+  The job gate keyed off `need_build == 'true'`, assuming `need_build == false`
+  meant `base-latest` was already current. A dry-run dispatch
+  (`promote_latest=false`) that pre-builds `base-<hash>` falsifies that: the
+  later tag run sees `need_build == false`, skips promotion, and leaves
+  `base-latest` one base behind. The gate now runs on every tag release /
+  promote dispatch, and the no-op optimization moved into the step as a `crane
+  digest` compare — it re-tags only when `base-latest` actually differs from the
+  released `base-<hash>` (genuine cache-hit releases stay a no-op). Workflow-only
+  change; base hash unaffected (no base rebuild). Ported from pi-devbox b7197e8
+  (which hit this on its v1.2.3 release, 2026-06-27).
+
+---
+
 ## v2.3.0 — 2026-06-25
 
 Minor release. Adds an **image-baked fallback skills + harness-instruction**

Dockerfile.base

@@ -35,6 +35,11 @@ ENV DEBIAN_FRONTEND=noninteractive
 # apt-get upgrade picks up any security/CVE fixes published between
 # debian:trixie-slim base-image rebuilds. Paired with the index update
 # and the install in the same layer so we don't bloat image history.
+# `nano` is included as a small, non-modal terminal editor for users who
+# don't want vi-style modal editing — a companion to nvim and the `micro`
+# binary installed further down. ~2.8 MB; its deps (libc6, libncursesw6,
+# libtinfo6) are already pulled in by nvim/less/htop/tmux, so it adds no
+# extra packages. EDITOR stays nvim; opt in via `export EDITOR=nano`.
 RUN apt-get update && \
     apt-get upgrade -y --no-install-recommends && \
     apt-get install -y --no-install-recommends \
@@ -66,6 +71,7 @@ RUN apt-get update && \
     rsync \
     python3-pip \
     python3-venv \
+    nano \
     && ln -s /usr/bin/fdfind /usr/local/bin/fd \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
@@ -204,6 +210,33 @@ RUN ARCH=$(case "${TARGETARCH}" in amd64) echo "x86_64" ;; arm64) echo "arm64" ;
     ln -s /opt/nvim-linux-${ARCH}/bin/nvim /usr/local/bin/nvim && \
     nvim --version | head -1
 
+# micro — modern, non-modal terminal editor. Ships alongside nvim so users
+# who aren't comfortable with vi-style modal editing have a friendly option:
+# desktop-style keybindings (Ctrl+S save, Ctrl+Q quit, Ctrl+C/V/X, Ctrl+Z
+# undo), mouse support, and syntax highlighting out of the box. A single
+# static Go binary (~12 MB) installed from GitHub releases, exactly like
+# bat/eza/zoxide below. EDITOR stays nvim (see below); users opt in with
+# `export EDITOR=micro` or `git config --global core.editor micro`.
+#
+# NOTE: upstream moved zyedidia/micro -> micro-editor/micro. The old org URL
+# still 302s, but its /releases/latest redirect lands on ANOTHER /latest URL
+# (the org rename), so the tag-parsing idiom below would resolve "latest"
+# instead of a version. Use the canonical micro-editor/micro URL.
+# Arch asset naming differs from the others: amd64 -> linux64, arm64 ->
+# linux-arm64. The tarball extracts to micro-<version>/micro.
+ARG MICRO_VERSION=latest
+RUN ARCH=$(case "${TARGETARCH}" in amd64) echo "linux64" ;; arm64) echo "linux-arm64" ;; *) echo "linux64" ;; esac) && \
+    V="${MICRO_VERSION}" && \
+    if [ "$V" = "latest" ]; then \
+      V=$(curl -sI --retry 5 --retry-delay 5 --retry-all-errors "https://github.com/micro-editor/micro/releases/latest" | awk 'tolower($1)=="location:" { sub(/\r$/,"",$2); n=split($2,a,"/"); print a[n] }'); \
+    fi && \
+    V="${V#v}" && [ -n "$V" ] && \
+    echo "Installing micro ${V}" && \
+    curl -fsSL --retry 5 --retry-delay 5 --retry-all-errors "https://github.com/micro-editor/micro/releases/download/v${V}/micro-${V}-${ARCH}.tar.gz" | tar -xz -C /tmp && \
+    install /tmp/micro-${V}/micro /usr/local/bin/micro && \
+    rm -rf /tmp/micro-${V} && \
+    micro --version
+
 # bat — syntax-highlighted cat replacement
 ARG BAT_VERSION=latest
 RUN ARCH=$(case "${TARGETARCH}" in amd64) echo "x86_64" ;; arm64) echo "aarch64" ;; *) echo "x86_64" ;; esac) && \
@@ -427,8 +460,9 @@ ENV PATH="/home/${USER_NAME}/.config/opencode/npm-global/bin:${PATH}"
 
 # ── Shell defaults (bash history, aliases, readline) ─────────────────
 RUN mkdir -p /etc/skel-devbox
-COPY rootfs/home/developer/.bash_aliases /etc/skel-devbox/.bash_aliases
-COPY rootfs/home/developer/.inputrc      /etc/skel-devbox/.inputrc
+COPY rootfs/home/developer/.bash_aliases     /etc/skel-devbox/.bash_aliases
+COPY rootfs/home/developer/.inputrc          /etc/skel-devbox/.inputrc
+COPY rootfs/home/developer/.gitignore_global /etc/skel-devbox/.gitignore_global
 
 # ── Entrypoint ────────────────────────────────────────────────────────
 COPY rootfs/usr/local/lib/opencode-devbox/ /usr/local/lib/opencode-devbox/

Dockerfile.variant

@@ -39,7 +39,7 @@ ARG USER_NAME=developer
 # edit, so the cache-hit class of bug that bit pi-devbox v0.74.0..
 # v0.75.5 cannot apply here.
 ARG INSTALL_OPENCODE=true
-ARG OPENCODE_VERSION=1.17.10
+ARG OPENCODE_VERSION=1.17.13
 RUN if [ "${INSTALL_OPENCODE}" = "true" ]; then \
       NPM_CONFIG_PREFIX=/usr npm install -g opencode-ai@${OPENCODE_VERSION} && \
       opencode --version ; \

README.md

@@ -263,6 +263,11 @@ volumes:
   - ~/.config/nvim:/home/developer/.config/nvim:ro
 ```
 
+> **Not a vi person?** The image also ships two non-modal editors alongside nvim:
+> **nano** (classic, minimal) and **micro** (modern — desktop-style `Ctrl+S`/`Ctrl+Q`
+> keys, mouse, syntax highlighting). `EDITOR` stays `nvim`; opt in per-shell with
+> `export EDITOR=nano` (or `micro`), or for git with `git config --global core.editor micro`.
+
 ### Python development with uv
 
 The image includes Python 3.13 (from Debian Trixie) and [uv](https://docs.astral.sh/uv/), a fast Python package manager that replaces pip, venv, and pyenv:
@@ -807,7 +812,7 @@ Container (Debian trixie)
 ├── opencode binary
 ├── oh-my-opencode-slim (optional — multi-agent orchestration plugin, includes Bun)
 ├── AWS CLI v2 (SSO + Bedrock auth)
-├── neovim 0.12, tmux, htop, bat, eza, zoxide, uv, rustup, make, gcc, g++, rsync
+├── neovim 0.12, nano, micro, tmux, htop, bat, eza, zoxide, uv, rustup, make, gcc, g++, rsync
 ├── git, git-crypt, age, gitleaks, ssh, ripgrep, fd, fzf, jq, curl, tree
 ├── Node.js (for MCP servers)
 ├── Bun (optional — included with oh-my-opencode-slim)

entrypoint-user.sh

@@ -33,7 +33,7 @@ fi
 # directly.
 SKEL_DIR="/etc/skel-devbox"
 if [ -d "$SKEL_DIR" ]; then
-  for f in .bash_aliases .inputrc; do
+  for f in .bash_aliases .inputrc .gitignore_global; do
     if [ -f "$SKEL_DIR/$f" ] && [ ! -e "$HOME/$f" ]; then
       cp "$SKEL_DIR/$f" "$HOME/$f"
     fi
@@ -92,6 +92,12 @@ fi
 if [ -n "${GIT_USER_EMAIL:-}" ] && ! git config --global user.email &>/dev/null; then
   git config --global user.email "$GIT_USER_EMAIL"
 fi
+# Global gitignore for personal/tooling artifacts (*.bak, *~, *.orig, ...).
+# Seeded above into $HOME/.gitignore_global from /etc/skel-devbox. Point git at
+# it only if the user has not already set their own core.excludesFile.
+if [ -f "$HOME/.gitignore_global" ] && ! git config --global core.excludesFile &>/dev/null; then
+  git config --global core.excludesFile "$HOME/.gitignore_global"
+fi
 
 # ── Generate opencode config from env vars if no config mounted ──────
 # Delegated to a standalone Python script for clarity and testability.

rootfs/home/developer/.gitignore_global

@@ -0,0 +1,11 @@
+# Global gitignore — personal/tooling artifacts (applies to all repos in the container)
+# Seeded into $HOME/.gitignore_global by entrypoint-user.sh and wired via
+# `git config --global core.excludesFile`. Edit freely; it is yours after first boot.
+
+# backup / editor / merge artifacts
+*.bak
+*.bak.*
+*~
+*.orig
+*.swp
+*.tmp

scripts/check-workflow-shell.sh

@@ -0,0 +1,67 @@
+#!/usr/bin/env bash
+# Gitea-accurate guard against the "bash syntax under the default sh/dash
+# shell" footgun. Ported from pi-devbox, where this class bit twice
+# (ed49b8d resolve-versions; b7197e8/b33e9dc promote-base-latest, run 418).
+# opencode-devbox has not been bitten yet — this is a PREVENTIVE guard so a
+# future author can't reintroduce the class.
+#
+# WHY A CUSTOM CHECK AND NOT JUST actionlint:
+#   actionlint models *GitHub* Actions, whose default `run` shell is bash. It
+#   therefore assumes a step that omits `shell:` runs under bash, and does NOT
+#   flag `set -o pipefail` there. Gitea Actions' default is `sh` (dash), so the
+#   exact bug (omit `shell:`, use bash syntax) is invisible to actionlint.
+#   actionlint only fires when a step *explicitly* declares `shell: sh`.
+#
+# THE INVARIANT THIS ENFORCES:
+#   Every `run:` step in every .gitea/workflows/*.yml must resolve to an
+#   effective shell of `bash` — via the step's own `shell:`, a job-level
+#   `defaults.run.shell`, or a workflow-level `defaults.run.shell`. Any step
+#   that would fall through to Gitea's `sh` default is a FAILURE, because a
+#   future author adding bash syntax to it fails silently in CI.
+#
+# Pair this with actionlint (which catches explicit `shell: sh` + bash syntax,
+# expression errors, and much else). Together they cover the class on Gitea.
+set -euo pipefail
+
+WF_DIR="${1:-.gitea/workflows}"
+
+python3 - "$WF_DIR" <<'PY'
+import sys, glob, os
+try:
+    import yaml
+except ImportError:
+    sys.stderr.write("ERROR: python3 yaml module missing (apt install python3-yaml)\n")
+    sys.exit(2)
+
+wf_dir = sys.argv[1]
+files = sorted(glob.glob(os.path.join(wf_dir, "*.yml")) + glob.glob(os.path.join(wf_dir, "*.yaml")))
+if not files:
+    sys.stderr.write(f"ERROR: no workflow files under {wf_dir}\n")
+    sys.exit(2)
+
+problems = []
+for f in files:
+    with open(f) as fh:
+        doc = yaml.safe_load(fh) or {}
+    wf_shell = (((doc.get("defaults") or {}).get("run") or {}).get("shell"))
+    jobs = doc.get("jobs") or {}
+    for jname, job in jobs.items():
+        job = job or {}
+        job_shell = (((job.get("defaults") or {}).get("run") or {}).get("shell"))
+        steps = job.get("steps") or []
+        for i, step in enumerate(steps):
+            step = step or {}
+            if "run" not in step:
+                continue  # `uses:` steps have no shell
+            eff = step.get("shell") or job_shell or wf_shell or "sh"  # Gitea default = sh
+            if eff != "bash":
+                name = step.get("name") or f"step[{i}]"
+                problems.append(f"{f}: job '{jname}' / '{name}': effective shell = '{eff}' (Gitea default is sh; declare shell: bash or a bash default)")
+
+if problems:
+    sys.stderr.write("Workflow shell guard FAILED — bash default not guaranteed:\n")
+    for p in problems:
+        sys.stderr.write(f"  - {p}\n")
+    sys.exit(1)
+print(f"Workflow shell guard OK — all run: steps in {len(files)} workflow file(s) resolve to bash.")
+PY

scripts/smoke-test.sh

@@ -3,6 +3,7 @@
 #
 # Verifies:
 #   - Core binaries are on PATH and runnable
+#   - non-modal editors nano + micro are present (alongside nvim)
 #   - opencode itself starts and prints a version
 #   - Entrypoint runs cleanly as non-root after UID adjustment
 #   - Generated opencode.json has the expected shape
@@ -118,6 +119,8 @@ run "node"              "node --version"
 run "npm"               "npm --version"
 run "git"               "git --version"
 run "nvim"              "nvim --version | head -1"
+run "nano"              "nano --version | head -1"
+run "micro"             "micro --version"
 run "bat"               "bat --version"
 run "eza"               "eza --version | head -1"
 run "zoxide"            "zoxide --version"