macos: fix two issues

lib/create-darwin-volume.sh

@@ -0,0 +1,102 @@
+#!/usr/bin/env bash
+set -e
+
+root_disks() {
+    diskutil list -plist /
+}
+
+apfs_volumes_for() {
+    disk=$1
+    diskutil apfs list -plist "$disk"
+}
+
+disk_identifier() {
+    xpath "/plist/dict/key[text()='WholeDisks']/following-sibling::array[1]/string/text()" 2>/dev/null
+}
+
+volume_get() {
+    key=$1 i=$2
+    xpath "/plist/dict/array/dict/key[text()='Volumes']/following-sibling::array/dict[$i]/key[text()='$key']/following-sibling::string[1]/text()" 2> /dev/null
+}
+
+find_nix_volume() {
+    disk=$1
+    i=1
+    volumes=$(apfs_volumes_for "$disk")
+    while true; do
+        name=$(echo "$volumes" | volume_get "Name" "$i")
+        if [ -z "$name" ]; then
+            break
+        fi
+        case "$name" in
+            [Nn]ix*)
+                echo "$name"
+                break
+                ;;
+        esac
+        i=$((i+1))
+    done
+}
+
+test_fstab() {
+    grep -q "/nix" /etc/fstab 2>/dev/null
+}
+
+test_synthetic_conf() {
+    grep -q "^nix" /etc/synthetic.conf 2>/dev/null
+}
+
+test_nix() {
+    test -d "/nix"
+}
+
+main() {
+    (
+        echo ""
+        echo "     ------------------------------------------------------------------ "
+        echo "    | This installer will create a volume for the nix store and        |"
+        echo "    | configure it to mount at /nix.  Follow these steps to uninstall. |"
+        echo "     ------------------------------------------------------------------ "
+        echo ""
+        echo "  1. Remove the entry from fstab using 'sudo vifs'"
+        echo "  2. Destroy the data volume using 'diskutil apfs deleteVolume'"
+        echo "  3. Delete /etc/synthetic.conf"
+        echo ""
+    ) >&2
+
+    if [ -L "/nix" ]; then
+        echo "error: /nix is a symlink, please remove it or edit synthetic.conf (requires reboot)" >&2
+        echo "  /nix -> $(readlink "/nix")" >&2
+        exit 2
+    fi
+
+    if ! test_synthetic_conf; then
+        echo "Configuring /etc/synthetic.conf..." >&2
+        echo nix | sudo tee /etc/synthetic.conf
+        /System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util -B
+    fi
+
+    if ! test_nix; then
+        echo "Creating mountpoint for /nix..." >&2
+        sudo mkdir /nix
+    fi
+
+    disk=$(root_disks | disk_identifier)
+    volume=$(find_nix_volume "$disk")
+    if [ -z "$volume" ]; then
+        echo "Creating a Nix Store volume..." >&2
+        sudo diskutil apfs addVolume "$disk" APFS 'Nix Store' -mountpoint /nix
+        volume="Nix Store"
+    else
+        echo "Using existing '$volume' volume" >&2
+    fi
+
+    if ! test_fstab; then
+        echo "Configuring /etc/fstab..." >&2
+        label=$(echo "$volume" | sed 's/ /\\040/g')
+        printf "\$a\nLABEL=%s /nix apfs rw\n.\nwq\n" "$label" | EDITOR=ed sudo vifs
+        sudo defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -bool true
+    fi
+}
+
+main "$@"

lib/main.js

@@ -19,6 +19,7 @@ Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(require("@actions/core"));
 const exec = __importStar(require("@actions/exec"));
 const tc = __importStar(require("@actions/tool-cache"));
+const child_process_1 = require("child_process");
 const os_1 = require("os");
 function nixConf() {
     return __awaiter(this, void 0, void 0, function* () {
@@ -35,22 +36,14 @@ function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
             const PATH = process.env.PATH;
-            const INSTALL_PATH = '/opt/nix';
             yield nixConf();
             // Catalina workaround https://github.com/NixOS/nix/issues/2925
             if (os_1.type() == "Darwin") {
-                yield exec.exec("sudo", ["sh", "-c", `echo \"nix\t${INSTALL_PATH}\"  >> /etc/synthetic.conf`]);
+                child_process_1.execFileSync(`${__dirname}/create-darwin-volume.sh`, { stdio: 'inherit' });
-                yield exec.exec("sudo", ["sh", "-c", `mkdir -m 0755 ${INSTALL_PATH} && chown runner ${INSTALL_PATH}`]);
-                yield exec.exec("/System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util", ["-B"]);
-                // Needed for sudo to pass NIX_IGNORE_SYMLINK_STORE
-                yield exec.exec("sudo", ["sh", "-c", "echo 'Defaults env_keep += NIX_IGNORE_SYMLINK_STORE'  >> /etc/sudoers"]);
-                core.exportVariable('NIX_IGNORE_SYMLINK_STORE', "1");
-                // Needed for nix-daemon installation
-                yield exec.exec("sudo", ["launchctl", "setenv", "NIX_IGNORE_SYMLINK_STORE", "1"]);
             }
             // Needed due to multi-user being too defensive
             core.exportVariable('ALLOW_PREEXISTING_INSTALLATION', "1");
-            // TODO: retry due to all the things that go wrong
+            // TODO: retry due to all the things that can go wrong
             const nixInstall = yield tc.downloadTool('https://nixos.org/nix/install');
             yield exec.exec("sh", [nixInstall, "--daemon"]);
             // write nix.conf again as installation overwrites it, reload the daemon to pick up changes
@@ -63,8 +56,6 @@ function run() {
                 // macOS needs certificates hints
                 core.exportVariable('NIX_SSL_CERT_FILE', '/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt');
                 // TODO: nc doesn't work correctly on macOS :(
-                //await exec.exec("sh", ["-c", "while ! nc -zU /nix/var/nix/daemon-socket/socket; do sleep 0.5; done"]);
-                // macOS needs time to reload the daemon :(
                 yield exec.exec("sleep", ["10"]);
             }
         }

src/main.ts

@@ -1,6 +1,7 @@
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
 import * as tc from '@actions/tool-cache';
+import {execFileSync} from 'child_process';
 import {type} from 'os';
 
 async function nixConf() {
@@ -18,27 +19,18 @@ async function nixConf() {
 async function run() {
   try {
     const PATH = process.env.PATH;
-    const INSTALL_PATH = '/opt/nix';
  
     await nixConf();
 
     // Catalina workaround https://github.com/NixOS/nix/issues/2925
     if (type() == "Darwin") {
-      await exec.exec("sudo", ["sh", "-c", `echo \"nix\t${INSTALL_PATH}\"  >> /etc/synthetic.conf`]);
+      execFileSync(`${__dirname}/create-darwin-volume.sh`, { stdio: 'inherit' });
-      await exec.exec("sudo", ["sh", "-c", `mkdir -m 0755 ${INSTALL_PATH} && chown runner ${INSTALL_PATH}`]);
-      await exec.exec("/System/Library/Filesystems/apfs.fs/Contents/Resources/apfs.util", ["-B"]);
-
-      // Needed for sudo to pass NIX_IGNORE_SYMLINK_STORE
-      await exec.exec("sudo", ["sh", "-c", "echo 'Defaults env_keep += NIX_IGNORE_SYMLINK_STORE'  >> /etc/sudoers"]);
-      core.exportVariable('NIX_IGNORE_SYMLINK_STORE', "1");
-      // Needed for nix-daemon installation
-      await exec.exec("sudo", ["launchctl", "setenv", "NIX_IGNORE_SYMLINK_STORE", "1"]);
     }
 
     // Needed due to multi-user being too defensive
     core.exportVariable('ALLOW_PREEXISTING_INSTALLATION', "1"); 
 
-    // TODO: retry due to all the things that go wrong
+    // TODO: retry due to all the things that can go wrong
     const nixInstall = await tc.downloadTool('https://nixos.org/nix/install');
     await exec.exec("sh", [nixInstall, "--daemon"]);
 
@@ -54,11 +46,8 @@ async function run() {
       core.exportVariable('NIX_SSL_CERT_FILE', '/nix/var/nix/profiles/default/etc/ssl/certs/ca-bundle.crt');
 
       // TODO: nc doesn't work correctly on macOS :(
-      //await exec.exec("sh", ["-c", "while ! nc -zU /nix/var/nix/daemon-socket/socket; do sleep 0.5; done"]);
-      // macOS needs time to reload the daemon :(
       await exec.exec("sleep", ["10"]);
     }
-
   } catch (error) {
     core.setFailed(`Action failed with error: ${error}`);
     throw(error);