GitHub Codespaces対応 - 基盤構築

README.org

@@ -30,6 +30,19 @@ Keyword: macOS, Xcode, Homebrew, Emacs, Zsh
   ./scripts/devcontainer-check.sh
   #+end_src
 
+** GitHub Codespaces
+- This repo includes a devcontainer definition at =.devcontainer/devcontainer.json=.
+- On first launch, Codespaces runs =./scripts/devcontainer-check.sh= which:
+  - runs =nix flake check=
+  - applies the Home Manager configuration for =vscode@devcontainer=
+- If you don't want your Codespace home directory dotfiles to be managed automatically, remove/disable =postCreateCommand= in =.devcontainer/devcontainer.json= and run the script manually when needed.
+
+** GitHub Codespaces Dotfiles
+- You can also use this repository as a Codespaces *Dotfiles* repository.
+- When configured in GitHub settings, Codespaces clones this repo and runs =./install.sh=.
+- On Linux (Codespaces), =install.sh= installs Nix (if needed) and applies the Home Manager configuration for the current user (e.g. =codespace@devcontainer=).
+- Note: this repo uses a git submodule (=resources/zsh/.zsh/zaw=). =install.sh= initializes submodules automatically, but your environment must allow fetching it.
+
 ** CI
 - GitHub Actions runs =nix flake check= on Ubuntu and macOS for every push and PR.
 

flake.nix

@@ -17,13 +17,23 @@
       hostConfig = import ./nix/hosts.nix;
       username = hostConfig.username;
       lib = nixpkgs.lib;
-      devcontainerHost = {
-        username = "vscode";
-        darwinHost = "devcontainer";
-        darwinSystem = hostConfig.darwinSystem;
-        wslHost = "devcontainer";
-        wslSystem = hostConfig.wslSystem;
-      };
+      devcontainerHosts = [
+        {
+          username = "vscode";
+          darwinHost = "devcontainer";
+          darwinSystem = hostConfig.darwinSystem;
+          wslHost = "devcontainer";
+          wslSystem = hostConfig.wslSystem;
+        }
+        # GitHub Codespaces often uses the "codespace" user (Dotfiles feature runs as the current user).
+        {
+          username = "codespace";
+          darwinHost = "devcontainer";
+          darwinSystem = hostConfig.darwinSystem;
+          wslHost = "devcontainer";
+          wslSystem = hostConfig.wslSystem;
+        }
+      ];
 
       mkPkgs = system:
         import nixpkgs {
@@ -66,10 +76,17 @@
       darwinConfigurations.${hostConfig.darwinHost} =
         mkDarwin hostConfig.darwinSystem;
 
-      homeConfigurations."${username}@${hostConfig.wslHost}" =
-        mkHome hostConfig.wslSystem;
-      homeConfigurations."${devcontainerHost.username}@${devcontainerHost.wslHost}" =
-        mkHomeWith { system = devcontainerHost.wslSystem; hostCfg = devcontainerHost; };
+      homeConfigurations =
+        {
+          "${username}@${hostConfig.wslHost}" = mkHome hostConfig.wslSystem;
+        }
+        // lib.listToAttrs (map
+          (dc:
+            {
+              name = "${dc.username}@${dc.wslHost}";
+              value = mkHomeWith { system = dc.wslSystem; hostCfg = dc; };
+            })
+          devcontainerHosts);
 
       checks = lib.genAttrs
         (lib.unique [ hostConfig.wslSystem hostConfig.darwinSystem ])
@@ -78,8 +95,10 @@
           then { darwin-config = (mkDarwin system).system; }
           else {
             home-wsl = (mkHome system).activationPackage;
-            home-devcontainer =
-              (mkHomeWith { system = system; hostCfg = devcontainerHost; }).activationPackage;
+            home-devcontainer-vscode =
+              (mkHomeWith { system = system; hostCfg = builtins.elemAt devcontainerHosts 0; }).activationPackage;
+            home-devcontainer-codespace =
+              (mkHomeWith { system = system; hostCfg = builtins.elemAt devcontainerHosts 1; }).activationPackage;
           });
     };
 }

install.sh

@@ -1,29 +1,94 @@
-#!/bin/bash
+#!/usr/bin/env bash
+set -euo pipefail
 
-echo "Checking dotnet";
-if !(type dotnet >/dev/null 2>&1); then
-    if [ ! -f /usr/local/share/dotnet/dotnet ]; then
-        echo "dotnet doesn't exsist."
-        ./scripts/install-dotnet.sh
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$ROOT_DIR"
+
+is_linux() { [[ "${OSTYPE:-}" == linux* ]]; }
+is_darwin() { [[ "${OSTYPE:-}" == darwin* ]]; }
+
+echo "Initializing submodules (if any)..."
+if command -v git >/dev/null 2>&1 && [ -f "$ROOT_DIR/.gitmodules" ]; then
+  git submodule update --init --recursive
+fi
+
+if is_linux; then
+  echo "Linux detected: applying Nix/Home Manager config (Codespaces-friendly)."
+
+  if ! command -v nix >/dev/null 2>&1; then
+    echo "Nix not found; installing Nix..."
+    # Prefer Determinate Nix installer (works well in containers).
+    if command -v curl >/dev/null 2>&1; then
+      curl -fsSL https://install.determinate.systems/nix | sh -s -- install --no-confirm || true
+    fi
+
+    # Load Nix profile if installed.
+    if [ -e /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh ]; then
+      # shellcheck disable=SC1091
+      . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
+    elif [ -e "${HOME}/.nix-profile/etc/profile.d/nix.sh" ]; then
+      # shellcheck disable=SC1091
+      . "${HOME}/.nix-profile/etc/profile.d/nix.sh"
     fi
-
-    eval `/usr/libexec/path_helper -s`    
+  fi
+
+  # Ensure flakes are enabled even on older Nix installs.
+  mkdir -p "${HOME}/.config/nix"
+  if [ ! -f "${HOME}/.config/nix/nix.conf" ] || ! grep -q "experimental-features" "${HOME}/.config/nix/nix.conf"; then
+    printf "\nexperimental-features = nix-command flakes\n" >> "${HOME}/.config/nix/nix.conf"
+  fi
+
+  if ! command -v nix >/dev/null 2>&1; then
+    echo "ERROR: nix command not available after install attempt." >&2
+    exit 1
+  fi
+
+  echo "Applying Home Manager configuration..."
+  current_user="$(id -un)"
+  target="${current_user}@devcontainer"
+  if nix --accept-flake-config run nixpkgs#home-manager -- switch --flake "$ROOT_DIR#${target}"; then
+    echo "Applied Home Manager for '$target'."
+  else
+    echo "WARNING: failed to apply '$target'; falling back to 'vscode@devcontainer'." >&2
+    nix --accept-flake-config run nixpkgs#home-manager -- switch --flake "$ROOT_DIR#vscode@devcontainer"
+  fi
+
+  echo "Done."
+  exit 0
 fi
 
-echo "Checking dotnet script";
-if !(dotnet tool list -g | grep dotnet-script > /dev/null 2>&1); then
-    echo "Install dotnet-script";
+if is_darwin; then
+  echo "macOS detected: running legacy (dotnet-script + Homebrew) installer."
+
+  echo "Checking dotnet"
+  if ! type dotnet >/dev/null 2>&1; then
+    if [ ! -f /usr/local/share/dotnet/dotnet ]; then
+      echo "dotnet doesn't exist."
+      ./scripts/install-dotnet.sh
+    fi
+
+    eval "$(/usr/libexec/path_helper -s)"
+  fi
+
+  echo "Checking dotnet script"
+  if ! (dotnet tool list -g | grep dotnet-script > /dev/null 2>&1); then
+    echo "Install dotnet-script"
     dotnet tool install -g dotnet-script
-fi
+  fi
 
-echo "Checking Homebrew"
-if !(type brew > /dev/null); then
+  echo "Checking Homebrew"
+  if ! type brew >/dev/null 2>&1; then
     if [ ! -d /opt/homebrew/bin ]; then
-        /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
+      /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"
     fi
-    
+
     eval "$(/opt/homebrew/bin/brew shellenv)"
+  fi
+
+  echo "Run installation scripts"
+  dotnet script scripts/Main.csx
+  exit 0
 fi
 
-echo "Run installation scripts"
-dotnet script scripts/Main.csx
+echo "Unsupported OS: OSTYPE='${OSTYPE:-unknown}'" >&2
+exit 1

scripts/devcontainer-check.sh

@@ -2,7 +2,7 @@
 set -euo pipefail
 
 echo "Running nix flake check..."
-nix flake check
+nix --accept-flake-config flake check
 
 echo "Applying home-manager config for devcontainer..."
-nix run nixpkgs#home-manager -- switch --flake .#devcontainer@devcontainer
+nix --accept-flake-config run nixpkgs#home-manager -- switch --flake .#vscode@devcontainer