build source

vendor/github.com/fergusstrange/embedded-postgres/cache_locator.go

@@ -0,0 +1,37 @@
+package embeddedpostgres
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+)
+
+// CacheLocator retrieves the location of the Postgres binary cache returning it to location.
+// The result of whether this cache is present will be returned to exists.
+type CacheLocator func() (location string, exists bool)
+
+func defaultCacheLocator(cacheDirectory string, versionStrategy VersionStrategy) CacheLocator {
+	return func() (string, bool) {
+		if cacheDirectory == "" {
+			cacheDirectory = ".embedded-postgres-go"
+			if userHome, err := os.UserHomeDir(); err == nil {
+				cacheDirectory = filepath.Join(userHome, ".embedded-postgres-go")
+			}
+		}
+
+		operatingSystem, architecture, version := versionStrategy()
+		cacheLocation := filepath.Join(cacheDirectory,
+			fmt.Sprintf("embedded-postgres-binaries-%s-%s-%s.txz",
+				operatingSystem,
+				architecture,
+				version))
+
+		info, err := os.Stat(cacheLocation)
+
+		if err != nil {
+			return cacheLocation, os.IsExist(err) && !info.IsDir()
+		}
+
+		return cacheLocation, !info.IsDir()
+	}
+}