install: default jj setup in one-click flow

install/install.sh

@@ -6,6 +6,119 @@ SKILL_NAME="gitea-issue-devops-agent"
 CODEX_HOME="${CODEX_HOME:-$HOME/.codex}"
 TARGET_DIR="${CODEX_HOME}/skills/${SKILL_NAME}"
 TMP_DIR="$(mktemp -d)"
+INSTALL_JJ="${INSTALL_JJ:-1}"
+JJ_INSTALL_METHOD="${JJ_INSTALL_METHOD:-auto}"
+JJ_CHANNEL="${JJ_CHANNEL:-release}"
+
+log() {
+  echo "[install] $*"
+}
+
+warn() {
+  echo "[install] warning: $*" >&2
+}
+
+manual_jj_help() {
+  warn "jj was not installed automatically."
+  warn "Manual options:"
+  warn "  - Homebrew: brew install jj"
+  warn "  - cargo-binstall: cargo binstall --strategies crate-meta-data jj-cli"
+  if [ "$JJ_CHANNEL" = "prerelease" ]; then
+    warn "  - cargo prerelease: cargo install --git https://github.com/jj-vcs/jj.git --locked --bin jj jj-cli"
+  else
+    warn "  - cargo release: cargo install --locked --bin jj jj-cli"
+  fi
+  warn "After installation, verify with: jj --version"
+}
+
+install_jj_with_brew() {
+  if ! command -v brew >/dev/null 2>&1; then
+    return 1
+  fi
+  if [ "$JJ_CHANNEL" != "release" ]; then
+    warn "brew path skipped because prerelease jj is requested."
+    return 1
+  fi
+
+  log "attempting jj installation via Homebrew"
+  brew install jj
+}
+
+install_jj_with_binstall() {
+  if ! command -v cargo >/dev/null 2>&1 || ! command -v cargo-binstall >/dev/null 2>&1; then
+    return 1
+  fi
+  if [ "$JJ_CHANNEL" != "release" ]; then
+    warn "cargo-binstall path skipped because prerelease jj is requested."
+    return 1
+  fi
+
+  log "attempting jj installation via cargo-binstall"
+  cargo binstall --strategies crate-meta-data jj-cli
+}
+
+install_jj_with_cargo() {
+  if ! command -v cargo >/dev/null 2>&1; then
+    return 1
+  fi
+
+  log "attempting jj installation via cargo"
+  if [ "$JJ_CHANNEL" = "prerelease" ]; then
+    cargo install --git https://github.com/jj-vcs/jj.git --locked --bin jj jj-cli
+  else
+    cargo install --locked --bin jj jj-cli
+  fi
+}
+
+attempt_jj_install() {
+  if [ "$INSTALL_JJ" = "0" ]; then
+    log "skipping jj installation because INSTALL_JJ=0"
+    return 0
+  fi
+
+  if command -v jj >/dev/null 2>&1; then
+    log "jj already installed: $(jj --version)"
+    return 0
+  fi
+
+  case "$JJ_INSTALL_METHOD" in
+    auto)
+      install_jj_with_brew || install_jj_with_binstall || install_jj_with_cargo || {
+        manual_jj_help
+        return 0
+      }
+      ;;
+    brew)
+      install_jj_with_brew || {
+        manual_jj_help
+        return 0
+      }
+      ;;
+    binstall)
+      install_jj_with_binstall || {
+        manual_jj_help
+        return 0
+      }
+      ;;
+    cargo)
+      install_jj_with_cargo || {
+        manual_jj_help
+        return 0
+      }
+      ;;
+    *)
+      warn "unsupported JJ_INSTALL_METHOD='$JJ_INSTALL_METHOD'; skipping jj install."
+      manual_jj_help
+      return 0
+      ;;
+  esac
+
+  if command -v jj >/dev/null 2>&1; then
+    log "jj installation succeeded: $(jj --version)"
+  else
+    manual_jj_help
+  fi
+}
 
 cleanup() {
   rm -rf "$TMP_DIR"
@@ -13,15 +126,15 @@ cleanup() {
 trap cleanup EXIT
 
 if ! command -v git >/dev/null 2>&1; then
-  echo "[install] git is required but not found."
+  log "git is required but not found."
   exit 1
 fi
 
-echo "[install] downloading ${SKILL_NAME} from ${REPO_URL}"
+log "downloading ${SKILL_NAME} from ${REPO_URL}"
 git clone --depth 1 "$REPO_URL" "$TMP_DIR/repo" >/dev/null 2>&1
 
 if [ ! -d "$TMP_DIR/repo/skills/${SKILL_NAME}" ]; then
-  echo "[install] skill directory not found in repository."
+  log "skill directory not found in repository."
   exit 1
 fi
 
@@ -29,5 +142,7 @@ mkdir -p "${CODEX_HOME}/skills"
 rm -rf "$TARGET_DIR"
 cp -R "$TMP_DIR/repo/skills/${SKILL_NAME}" "$TARGET_DIR"
 
-echo "[install] done"
-echo "[install] installed path: ${TARGET_DIR}"
+log "skill installed"
+log "installed path: ${TARGET_DIR}"
+attempt_jj_install
+log "done"