brew: improve formula to remove deprecated syntax

Updates the formula to no longer rely on deprecated plist functionality.
Fixes the issue with the service failing due to hardcoded PATH variable
for the service. Generates the service manifest dynamically instead of
embedding it into the formula.

Signed-off-by: Ismayil Mirzali <ismayilmirzeli@gmail.com>

aws-rotate-iam-keys.template.rb

@@ -8,15 +8,9 @@ class AwsRotateIamKeys < Formula
   homepage "https://aws-rotate-iam-keys.com"
   url "${HOMEBREW_URL}"
   sha256 "${HOMEBREW_SHA}"
-  depends_on "awscli" => :recommended
   depends_on "gnu-getopt"
   depends_on "jq"
-
-  head do
-    Dir.chdir(File.expand_path(File.join(File.dirname(__FILE__), '../'))) do
-      url %x{git config --local --get remote.origin.url | tr -d '\n'}, using: :git
-    end
-  end
+  depends_on "awscli" => :recommended
 
   def install
     bin.install "src/bin/aws-rotate-iam-keys"
@@ -27,7 +21,7 @@ def install
   end
 
   def caveats
-    s = <<~EOS
+    <<~EOS
       We've installed a default/global configuration file to:
           #{etc}/aws-rotate-iam-keys
 
@@ -50,42 +44,16 @@ def caveats
     EOS
   end
 
-  plist_options :startup => false
-
-  def plist; <<~EOS
-    <?xml version="1.0" encoding="UTF-8"?>
-    <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-    <plist version="1.0">
-    <dict>
-      <key>EnvironmentVariables</key>
-      <dict>
-        <key>PATH</key>
-        <string>/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin</string>
-      </dict>
-      <key>Label</key>
-      <string>#{plist_name}</string>
-      <key>ProgramArguments</key>
-      <array>
-        <string>/bin/bash</string>
-        <string>-c</string>
-        <string>if ! curl -s www.google.com > /dev/null; then sleep 60; fi; cp /dev/null /tmp/#{plist_name}.log ; ( egrep '^[[:space:]]*-' ~/.aws-rotate-iam-keys 2>/dev/null || cat #{etc}/aws-rotate-iam-keys ) | while read line; do aws-rotate-iam-keys §line; done</string>
-      </array>
-      <key>StandardOutPath</key>
-      <string>/tmp/#{plist_name}.log</string>
-      <key>StandardErrorPath</key>
-      <string>/tmp/#{plist_name}.log</string>
-      <key>RunAtLoad</key>
-      <true/>
-      <key>StartCalendarInterval</key>
-      <dict>
-        <key>Hour</key>
-        <integer>3</integer>
-        <key>Minute</key>
-        <integer>23</integer>
-      </dict>
-    </dict>
-    </plist>
-  EOS
+  def log_path
+    var/"log/#{name}.log"
+  end
+  service do
+    run opt_bin/"aws-rotate-iam-keys"
+    run_type :cron
+    cron "0 10 * * *"
+    environment_variables PATH: std_service_path_env
+    log_path f.log_path
+    error_log_path f.log_path
   end
 
   test do