Update default sentinel file location (#26)

* Update default sentinel file location

Uses current Kured location

* Don't run GoReleaser on branches

Where is it going to push the binary?

* Keep /run location

.github/workflows/goreleaser.yaml

@@ -4,9 +4,6 @@ on:
   push:
     tags:
       - "v*"
-  pull_request:
-    branches:
-      - "master"
 
 permissions:
   contents: write
@@ -22,7 +19,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v4
         with:
-          go-version: "1.20"
+          go-version: "1.21"
       - name: Install test dependencies
         run: go get .
       - name: Test

go.mod

@@ -1,6 +1,6 @@
 module github.com/utilitywarehouse/flatcar-pxe-update-engine
 
-go 1.20
+go 1.21
 
 require (
 	github.com/godbus/dbus/v5 v5.1.0

update_engine.go

@@ -34,6 +34,7 @@ const (
 var (
 	// Flag file location for kured:
 	// https://github.com/flatcar-linux/update_engine/commit/93f6cdddd46e9fba6c336c1db3baa6c89d85979b
+	// https://refspecs.linuxfoundation.org/FHS_3.0/fhs/ch05s13.html
 	kuredReleasePath = "/run/reboot-required"
 )
 
@@ -257,7 +258,7 @@ func touchFile(fileName string) error {
 
 // fuzzDuration adds a random jitter to a given duration. It's adapted from the
 // equivalent method in the original update_engine:
-//  - https://github.com/kinvolk/update_engine/blob/v0.4.10/src/update_engine/utils.cc#L510-L515
+//   - https://github.com/kinvolk/update_engine/blob/v0.4.10/src/update_engine/utils.cc#L510-L515
 func fuzzDuration(r *rand.Rand, value time.Duration, fuzz time.Duration) time.Duration {
 	min := int64(value.Nanoseconds() - (fuzz.Nanoseconds() / 2))
 	max := int64(value.Nanoseconds() + (fuzz.Nanoseconds() / 2))