cache: lock the repo with a pid file; automatic cleaning

1 files changed, 23 insertions, 0 deletions

diff --git a/util/process.go b/util/process.go
new file mode 100644
index 00000000..ddd3f704
--- /dev/null
+++ b/util/process.go
@@ -0,0 +1,23 @@
+package util
+
+import (
+	"os"
+	"syscall"
+)
+
+// ProcessIsRunning tell is a process is running
+func ProcessIsRunning(pid int) bool {
+	// never return no error in a unix system
+	process, err := os.FindProcess(pid)
+
+	if err != nil {
+		return false
+	}
+
+	// Signal 0 doesn't do anything but allow testing the process
+	err = process.Signal(syscall.Signal(0))
+
+	// Todo: distinguish "you don't have access" and "process doesn't exist"
+
+	return err == nil
+}