From eda5259500c941deb9d2b2f6e2f940b5bfd12603 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Thu, 18 Jun 2026 15:03:08 +0000
Subject: [PATCH] chore: SessionStart hook to install polyglot toolchains

Ephemeral web containers lose installed tools on restart. Add an idempotent,
non-fatal SessionStart hook that (re)installs GNAT+gprbuild+GnuCOBOL (apt),
ponyc (ponyup), and Alire alr 2.1.1 when missing, and ensures ponyc is on PATH.
Appended alongside the existing R/Octave session-start hook. User-authorized.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015hmgREHNsxYCuim33yUF2c
---
 .claude/hooks/install-toolchains.sh | 81 +++++++++++++++++++++++++++++
 .claude/settings.json               |  4 ++
 2 files changed, 85 insertions(+)
 create mode 100755 .claude/hooks/install-toolchains.sh

diff --git a/.claude/hooks/install-toolchains.sh b/.claude/hooks/install-toolchains.sh
new file mode 100755
index 0000000..bd2fe1d
--- /dev/null
+++ b/.claude/hooks/install-toolchains.sh
@@ -0,0 +1,81 @@
+#!/bin/bash
+# SessionStart hook — install the polyglot build toolchains for this repo.
+#
+# Claude Code on the web runs in an ephemeral container: anything installed
+# outside the cached project tree vanishes on restart. This hook reinstalls the
+# toolchains the project depends on at the start of every session:
+#   * GNAT + gprbuild + GnuCOBOL   (apt: gnat gprbuild gnucobol)
+#   * Pony (ponyc) via ponyup
+#   * Alire (alr) 2.1.1            (prebuilt release zip)
+#
+# Design rules:
+#   * IDEMPOTENT — each tool is skipped if it is already on PATH (command -v).
+#   * NON-FATAL — a failed download/install must NOT break the session. We never
+#     run `set -e`; every step is guarded and the script always exits 0.
+#   * Warnings (not errors) are logged so failures are visible in the session log.
+
+log()  { echo "[install-toolchains] $*"; }
+warn() { echo "[install-toolchains] WARNING: $*" >&2; }
+
+export DEBIAN_FRONTEND=noninteractive
+
+# ---------------------------------------------------------------------------
+# GNAT + gprbuild + GnuCOBOL (apt)
+# ---------------------------------------------------------------------------
+if command -v gnatmake >/dev/null 2>&1 && command -v cobc >/dev/null 2>&1; then
+  log "GNAT/gprbuild/GnuCOBOL already present; skipping apt install."
+else
+  log "Installing gnat gprbuild gnucobol via apt-get ..."
+  if ! sudo apt-get install -y gnat gprbuild gnucobol; then
+    warn "apt-get install of gnat/gprbuild/gnucobol failed; continuing."
+  fi
+fi
+
+# ---------------------------------------------------------------------------
+# Pony (ponyc) via ponyup
+# ---------------------------------------------------------------------------
+if command -v ponyc >/dev/null 2>&1; then
+  log "ponyc already present; skipping ponyup install."
+else
+  log "Installing ponyc via ponyup ..."
+  if sh -c "$(curl --proto '=https' --tlsv1.2 -sSf https://raw.githubusercontent.com/ponylang/ponyup/latest-release/ponyup-init.sh)"; then
+    if ! /root/.local/share/ponyup/bin/ponyup update ponyc release; then
+      warn "ponyup update ponyc release failed; continuing."
+    fi
+  else
+    warn "ponyup-init.sh download/run failed; continuing."
+  fi
+fi
+
+# ---------------------------------------------------------------------------
+# Alire (alr) 2.1.1
+# ---------------------------------------------------------------------------
+if command -v alr >/dev/null 2>&1; then
+  log "alr already present; skipping Alire install."
+else
+  log "Installing Alire (alr) 2.1.1 ..."
+  if curl -sSL -o /tmp/alr.zip https://github.com/alire-project/alire/releases/download/v2.1.1/alr-2.1.1-bin-x86_64-linux.zip; then
+    if ( cd /tmp && unzip -o -q alr.zip && sudo cp bin/alr /usr/local/bin/alr && chmod +x /usr/local/bin/alr ); then
+      log "alr installed to /usr/local/bin/alr"
+    else
+      warn "Alire unzip/copy failed; continuing."
+    fi
+  else
+    warn "Alire download failed; continuing."
+  fi
+fi
+
+# ---------------------------------------------------------------------------
+# Ensure ponyc is on PATH for future shells.
+# ---------------------------------------------------------------------------
+PONY_PATH_LINE='export PATH=/root/.local/share/ponyup/bin:$PATH'
+if [ -f "$HOME/.bashrc" ] && grep -qF "$PONY_PATH_LINE" "$HOME/.bashrc"; then
+  log "ponyup PATH line already in ~/.bashrc; skipping."
+else
+  log "Appending ponyup PATH line to ~/.bashrc"
+  echo "$PONY_PATH_LINE" >> "$HOME/.bashrc" || warn "Could not append to ~/.bashrc; continuing."
+fi
+
+log "Done."
+# Never fail the session, regardless of what happened above.
+exit 0
diff --git a/.claude/settings.json b/.claude/settings.json
index e06b033..c035985 100644
--- a/.claude/settings.json
+++ b/.claude/settings.json
@@ -6,6 +6,10 @@
           {
             "type": "command",
             "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/session-start.sh"
+          },
+          {
+            "type": "command",
+            "command": "$CLAUDE_PROJECT_DIR/.claude/hooks/install-toolchains.sh"
           }
         ]
       }