From 157fed329c9eea24d4b52e9244d09eed499a4e83 Mon Sep 17 00:00:00 2001
From: Sean Molenaar <sean@seanmolenaar.eu>
Date: Tue, 4 May 2021 16:22:28 +0200
Subject: [PATCH] service: install linux service file

---
 Library/Homebrew/formula.rb                   | 12 +++++++++++
 Library/Homebrew/formula_installer.rb         | 16 +++++++++-----
 .../Homebrew/test/formula_installer_spec.rb   | 21 ++++++++++++-------
 3 files changed, 36 insertions(+), 13 deletions(-)

diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 71ddf5f128..5953b36097 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -962,12 +962,24 @@ class Formula
     "homebrew.mxcl.#{name}"
   end
 
+  # The generated service name.
+  sig { returns(String) }
+  def service_name
+    "homebrew.#{name}"
+  end
+
   # The generated launchd {.plist} file path.
   sig { returns(Pathname) }
   def plist_path
     prefix/"#{plist_name}.plist"
   end
 
+  # The generated systemd {.service} file path.
+  sig { returns(Pathname) }
+  def systemd_service_path
+    prefix/"#{service_name}.service"
+  end
+
   # The service specification of the software.
   def service
     return unless service?
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index eb0e538d34..b33601b826 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -1020,21 +1020,27 @@ class FormulaInstaller
       return
     end
 
-    plist = if formula.service?
+    if formula.service?
+      service_path = formula.systemd_service_path
+      service_path.atomic_write(formula.service.to_systemd_unit)
+      service_path.chmod 0644
+    end
+
+    service = if formula.service?
       formula.service.to_plist
     elsif formula.plist
       formula.plist
     end
 
-    return unless plist
+    return unless service
 
     plist_path = formula.plist_path
-    plist_path.atomic_write(plist)
+    plist_path.atomic_write(service)
     plist_path.chmod 0644
     log = formula.var/"log"
-    log.mkpath if plist.include? log.to_s
+    log.mkpath if service.include? log.to_s
   rescue Exception => e # rubocop:disable Lint/RescueException
-    ofail "Failed to install plist file"
+    ofail "Failed to install service files"
     odebug e, e.backtrace
   end
 
diff --git a/Library/Homebrew/test/formula_installer_spec.rb b/Library/Homebrew/test/formula_installer_spec.rb
index 31a3a7c273..9ac8e38925 100644
--- a/Library/Homebrew/test/formula_installer_spec.rb
+++ b/Library/Homebrew/test/formula_installer_spec.rb
@@ -231,30 +231,34 @@ describe FormulaInstaller do
       installer = described_class.new(formula)
       expect {
         installer.install_service
-      }.not_to output(/Error: Failed to install plist file/).to_stderr
+      }.not_to output(/Error: Failed to install service files/).to_stderr
 
       expect(path).to exist
     end
 
     it "works if service is set" do
       formula = Testball.new
-      path = formula.plist_path
+      plist_path = formula.plist_path
+      service_path = formula.systemd_service_path
       service = Homebrew::Service.new(formula)
       formula.prefix.mkpath
 
       expect(formula).to receive(:plist).and_return(nil)
-      expect(formula).to receive(:service?).twice.and_return(true)
-      expect(formula).to receive(:service).and_return(service)
+      expect(formula).to receive(:service?).exactly(3).and_return(true)
+      expect(formula).to receive(:service).twice.and_return(service)
       expect(formula).to receive(:plist_path).and_call_original
+      expect(formula).to receive(:systemd_service_path).and_call_original
 
       expect(service).to receive(:to_plist).and_return("plist")
+      expect(service).to receive(:to_systemd_unit).and_return("unit")
 
       installer = described_class.new(formula)
       expect {
         installer.install_service
-      }.not_to output(/Error: Failed to install plist file/).to_stderr
+      }.not_to output(/Error: Failed to install service files/).to_stderr
 
-      expect(path).to exist
+      expect(plist_path).to exist
+      expect(service_path).to exist
     end
 
     it "returns without definition" do
@@ -263,13 +267,14 @@ describe FormulaInstaller do
       formula.prefix.mkpath
 
       expect(formula).to receive(:plist).and_return(nil)
-      expect(formula).to receive(:service?).twice.and_return(nil)
+      expect(formula).to receive(:service?).exactly(3).and_return(nil)
       expect(formula).not_to receive(:plist_path)
+      expect(formula).not_to receive(:to_systemd_unit)
 
       installer = described_class.new(formula)
       expect {
         installer.install_service
-      }.not_to output(/Error: Failed to install plist file/).to_stderr
+      }.not_to output(/Error: Failed to install service files/).to_stderr
 
       expect(path).not_to exist
     end