feat: dev tools

install-scripts/README.md

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+# Custom install scripts
+
+This directory supplies the ready-made `python` and `dotnet` scripts. They are not reserved:
+modify, replace, or remove them like any other script. Place other trusted executable install
+scripts here and add the desired file names to `AGENTCI_INSTALL_SCRIPTS`. Compose mounts the
+directory read-only at `/etc/agentci/install-scripts`.
+
+Scripts run from the cloned repository with a sanitized environment. They receive:
+
+- `DEV_TOOLS_DIR`: persistent, writable tool storage at `/var/lib/agentci/dev-tools`
+- `PATH`: `$DEV_TOOLS_DIR/bin` followed by the service path
+- `PYTHON_VERSION` and `DOTNET_CHANNEL`: configured built-in runtime versions
+
+`DEV_TOOLS_DIR` is shared by jobs through the `agentci_data` volume. Put downloaded SDK/runtime
+files beneath it and install command wrappers or symlinks into `$DEV_TOOLS_DIR/bin`; that `bin`
+directory is prepended to implementation agents' `PATH`. Environment changes made by a script do
+not persist into implementation turns.
+
+The configured scripts run in list order after the repository is cloned (or an existing agent PR
+branch is synchronized) and before the first implementation turn for `implement`, `iterate`, and
+`fix`. They do not rerun between implementation and review-revision turns within one job. Scripts
+must be executable, idempotent, and must not expect AgentCI or Gitea credentials.

install-scripts/dotnet

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+#!/bin/sh
+set -eu
+
+: "${DEV_TOOLS_DIR:?DEV_TOOLS_DIR is required}"
+: "${DOTNET_CHANNEL:?DOTNET_CHANNEL is required}"
+
+install_dir="$DEV_TOOLS_DIR/dotnet"
+bin_dir="$DEV_TOOLS_DIR/bin"
+installer=$(mktemp)
+trap 'rm -f "$installer"' EXIT
+
+mkdir -p "$install_dir" "$bin_dir"
+python3 - "$installer" <<'PYTHON'
+import sys
+import urllib.request
+
+urllib.request.urlretrieve("https://dot.net/v1/dotnet-install.sh", sys.argv[1])
+PYTHON
+
+/bin/bash "$installer" \
+    --channel "$DOTNET_CHANNEL" \
+    --install-dir "$install_dir" \
+    --no-path
+
+printf '%s\n' \
+    '#!/bin/sh' \
+    "export DOTNET_ROOT='$install_dir'" \
+    "exec '$install_dir/dotnet' \"\$@\"" \
+    > "$bin_dir/dotnet"
+chmod 0755 "$bin_dir/dotnet"
+"$bin_dir/dotnet" --info

install-scripts/python

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+#!/bin/sh
+set -eu
+
+: "${DEV_TOOLS_DIR:?DEV_TOOLS_DIR is required}"
+: "${PYTHON_VERSION:?PYTHON_VERSION is required}"
+
+install_dir="$DEV_TOOLS_DIR/python"
+bin_dir="$DEV_TOOLS_DIR/bin"
+minor_version=$(printf '%s' "$PYTHON_VERSION" | cut -d. -f1,2)
+
+mkdir -p "$install_dir" "$bin_dir"
+UV_NO_CONFIG=1 \
+UV_PYTHON_INSTALL_DIR="$install_dir" \
+UV_PYTHON_BIN_DIR="$bin_dir" \
+UV_PYTHON_INSTALL_BIN=1 \
+uv python install "$PYTHON_VERSION"
+
+ln -sfn "python$minor_version" "$bin_dir/python3"
+ln -sfn "python$minor_version" "$bin_dir/python"
+"$bin_dir/python" --version