feat: datcode

bin/datcode

@@ -0,0 +1,130 @@
+#!/bin/sh
+
+set -eu
+
+instance=datcode
+script_path=$(readlink -f -- "$0")
+script_dir=$(CDPATH= cd -- "$(dirname -- "$script_path")" && pwd)
+root_dir=$(dirname -- "$script_dir")
+data_dir=$root_dir/data
+workdir=$(pwd -P)
+owns_vm=false
+mode=run
+
+if [ "$#" -gt 0 ]; then
+  if [ "$#" -ne 1 ] || [ "$1" != update ]; then
+    printf '%s\n' "usage: datcode [update]" >&2
+    exit 2
+  fi
+  mode=update
+fi
+
+if ! command -v limactl >/dev/null 2>&1; then
+  printf '%s\n' "datcode: limactl is not installed or not in PATH" >&2
+  exit 1
+fi
+
+if [ "$mode" = run ]; then
+  case "$workdir" in
+    /dat | /dat/*) ;;
+    *)
+      printf '%s\n' "datcode: the working directory must be under /dat" >&2
+      exit 1
+      ;;
+  esac
+fi
+
+mkdir -p \
+  "$data_dir/config" \
+  "$data_dir/share" \
+  "$data_dir/state" \
+  "$data_dir/tmux"
+
+cleanup() {
+  status=$?
+  trap - EXIT HUP INT TERM
+
+  if [ "$owns_vm" = true ]; then
+    vm_status=$(limactl list "$instance" --format '{{.Status}}' 2>/dev/null || true)
+    if [ "$vm_status" = "Running" ]; then
+      if ! limactl stop "$instance" >/dev/null 2>&1; then
+        printf '%s\n' "datcode: graceful VM shutdown failed; forcing shutdown" >&2
+        limactl stop --force "$instance" >/dev/null 2>&1 || true
+      fi
+    fi
+  fi
+  exit "$status"
+}
+
+trap cleanup EXIT
+trap 'exit 129' HUP
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+start_vm() {
+  owns_vm=true
+  printf '%s\n' "datcode: starting VM (first boot can take several minutes)"
+  limactl start --timeout=10m "$instance"
+}
+
+if [ "$(limactl list "$instance" --quiet 2>/dev/null || true)" = "$instance" ]; then
+  vm_status=$(limactl list "$instance" --format '{{.Status}}')
+  if [ "$vm_status" != "Stopped" ]; then
+    printf '%s\n' "datcode: instance is $vm_status; only one datcode session may run at a time" >&2
+    exit 1
+  fi
+else
+  limactl create --tty=false --name="$instance" "$root_dir/lima.yaml"
+fi
+
+if [ "$mode" = update ]; then
+  limactl edit --tty=false --mount-only "$data_dir:w" "$instance"
+else
+  case "$data_dir" in
+    "$workdir" | "$workdir"/*)
+      limactl edit --tty=false --mount-only "$workdir:w" "$instance"
+      ;;
+    *)
+      case "$workdir" in
+        "$data_dir" | "$data_dir"/*)
+          limactl edit --tty=false --mount-only "$data_dir:w" "$instance"
+          ;;
+        *)
+          limactl edit --tty=false \
+            --mount-only "$workdir:w" \
+            --mount-only "$data_dir:w" \
+            "$instance"
+          ;;
+      esac
+      ;;
+  esac
+fi
+
+start_vm
+
+if ! limactl shell --tty=false "$instance" /bin/bash -lc \
+  'sudo -n docker info >/dev/null && command -v bun >/dev/null && command -v opencode >/dev/null && command -v tmux >/dev/null'; then
+  printf '%s\n' "datcode: VM provisioning failed; inspect /var/log/cloud-init-output.log" >&2
+  exit 1
+fi
+
+if ! limactl shell --tty=false "$instance" docker info >/dev/null; then
+  printf '%s\n' "datcode: restarting VM to activate Docker group membership"
+  limactl stop "$instance" >/dev/null
+  start_vm
+fi
+
+if ! limactl shell --tty=false "$instance" /bin/bash -lc \
+  'docker info >/dev/null && command -v bun >/dev/null && command -v opencode >/dev/null && command -v tmux >/dev/null'; then
+  printf '%s\n' "datcode: VM readiness check failed" >&2
+  exit 1
+fi
+
+if [ "$mode" = update ]; then
+  limactl shell "$instance" /bin/bash -lc \
+    'export BUN_INSTALL="$HOME/.local"; exec bun install --global opencode-ai'
+else
+  limactl shell --workdir "$workdir" "$instance" \
+    /usr/bin/tmux new-session -A -s dat \
+    /bin/bash -lc '/usr/local/bin/opencode; exec /bin/bash'
+fi