Merge pull request #1450 from allenbenz/add-syncthing

Add syncthing package

packages/syncthing.rb

+require 'package'
+
+class Syncthing < Package
+  description 'An application that lets you synchronize your files across multiple devices'
+  homepage 'https://github.com/syncthing/syncthing'
+  version '0.14.41'
+  source_url 'https://github.com/syncthing/syncthing/archive/v0.14.41.tar.gz'
+  source_sha256 '9c406897443465e03d3259df1dda10bd86e49ae4286f8c855d9f35e47026af2f'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'go' => :build
+
+  def self.build
+    #The system tmp dir is mounted noexec, and the build will fail if it is used
+    system "TMPDIR=/usr/local/tmp go run build.go -version v0.14.40"
+  end
+
+  def self.install
+    system "mkdir -p #{CREW_DEST_PREFIX}/bin"
+    system "mv bin/syncthing #{CREW_DEST_PREFIX}/bin/syncthing-bin"
+
+    [ 1, 5, 7 ].each do |i|
+        system "mkdir -p #{CREW_DEST_PREFIX}/share/man/man#{i}"
+        system "gzip man/*.#{i}"
+        system "cp -R man/*.#{i}.gz #{CREW_DEST_PREFIX}/share/man/man#{i}"
+    end
+
+    #syncthing requires some ports to be open
+    system %Q(echo '#!/bin/bash
+if [[ $EUID == 0 ]]; then
+    echo "Do not run syncthing as root."
+    echo "This wrapper script calls iptables with sudo to open ports for syncthing."
+    echo "syncthing run as root will try and fail to write to the read-only root directory."
+    exit
+fi
+
+#syncthing listens on these ports
+sudo /sbin/iptables -I INPUT -p tcp --dport 22000 -j ACCEPT &&
+sudo /sbin/iptables -I INPUT -p udp --dport 21025 -j ACCEPT &&
+
+syncthing-bin "$@"
+
+#clean up created rules to avoid duplicating them
+sudo /sbin/iptables -D INPUT -p tcp --dport 22000 -j ACCEPT
+sudo /sbin/iptables -D INPUT -p udp --dport 21025 -j ACCEPT
+' > #{CREW_DEST_PREFIX}/bin/syncthing)
+    system "chmod +x #{CREW_DEST_PREFIX}/bin/syncthing"
+
+    #The build process leaves 50M of files around that we do not need
+    system "rm -rf /usr/local/tmp/syncthing-*/"
+  end
+end