Add confugurable cachePath (#120)

README.md

@@ -42,6 +42,7 @@ This library aims to require as little configuration as possible, favouring over
 | Password            | postgres                                        |
 | Database            | postgres                                        |
 | Version             | 12.1.0                                          |
+| CachePath           | $USER_HOME/.embedded-postgres-go/               |
 | RuntimePath         | $USER_HOME/.embedded-postgres-go/extracted      |
 | DataPath            | $USER_HOME/.embedded-postgres-go/extracted/data |
 | BinariesPath        | $USER_HOME/.embedded-postgres-go/extracted      |

cache_locator.go

@@ -10,11 +10,13 @@ import (
 // The result of whether this cache is present will be returned to exists.
 type CacheLocator func() (location string, exists bool)
 
-func defaultCacheLocator(versionStrategy VersionStrategy) CacheLocator {
+func defaultCacheLocator(cacheDirectory string, versionStrategy VersionStrategy) CacheLocator {
 	return func() (string, bool) {
-		cacheDirectory := ".embedded-postgres-go"
-		if userHome, err := os.UserHomeDir(); err == nil {
-			cacheDirectory = filepath.Join(userHome, ".embedded-postgres-go")
+		if cacheDirectory == "" {
+			cacheDirectory = ".embedded-postgres-go"
+			if userHome, err := os.UserHomeDir(); err == nil {
+				cacheDirectory = filepath.Join(userHome, ".embedded-postgres-go")
+			}
 		}
 
 		operatingSystem, architecture, version := versionStrategy()

cache_locator_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func Test_defaultCacheLocator_NotExists(t *testing.T) {
-	locator := defaultCacheLocator(func() (string, string, PostgresVersion) {
+	locator := defaultCacheLocator("", func() (string, string, PostgresVersion) {
 		return "a", "b", "1.2.3"
 	})
 
@@ -16,3 +16,14 @@ func Test_defaultCacheLocator_NotExists(t *testing.T) {
 	assert.Contains(t, cacheLocation, ".embedded-postgres-go/embedded-postgres-binaries-a-b-1.2.3.txz")
 	assert.False(t, exists)
 }
+
+func Test_defaultCacheLocator_CustomPath(t *testing.T) {
+	locator := defaultCacheLocator("/custom/path", func() (string, string, PostgresVersion) {
+		return "a", "b", "1.2.3"
+	})
+
+	cacheLocation, exists := locator()
+
+	assert.Equal(t, cacheLocation, "/custom/path/embedded-postgres-binaries-a-b-1.2.3.txz")
+	assert.False(t, exists)
+}

config.go

@@ -14,6 +14,7 @@ type Config struct {
 	database            string
 	username            string
 	password            string
+	cachePath           string
 	runtimePath         string
 	dataPath            string
 	binariesPath        string
@@ -82,6 +83,13 @@ func (c Config) RuntimePath(path string) Config {
 	return c
 }
 
+// CachePath sets the path that will be used for storing Postgres binaries archive.
+// If this option is not set, ~/.go-embedded-postgres will be used.
+func (c Config) CachePath(path string) Config {
+	c.cachePath = path
+	return c
+}
+
 // DataPath sets the path that will be used for the Postgres data directory.
 // If this option is set, a previously initialized data directory will be reused if possible.
 func (c Config) DataPath(path string) Config {

embedded_postgres.go

@@ -44,7 +44,7 @@ func newDatabaseWithConfig(config Config) *EmbeddedPostgres {
 		linuxMachineName,
 		shouldUseAlpineLinuxBuild,
 	)
-	cacheLocator := defaultCacheLocator(versionStrategy)
+	cacheLocator := defaultCacheLocator(config.cachePath, versionStrategy)
 	remoteFetchStrategy := defaultRemoteFetchStrategy(config.binaryRepositoryURL, versionStrategy, cacheLocator)
 
 	return &EmbeddedPostgres{

embedded_postgres_test.go

@@ -620,6 +620,30 @@ func Test_CustomBinariesRepo(t *testing.T) {
 	}
 }
 
+func Test_CachePath(t *testing.T) {
+	cacheTempDir, err := os.MkdirTemp("", "prepare_database_test_cache")
+	if err != nil {
+		panic(err)
+	}
+
+	defer func() {
+		if err := os.RemoveAll(cacheTempDir); err != nil {
+			panic(err)
+		}
+	}()
+
+	database := NewDatabase(DefaultConfig().
+		CachePath(cacheTempDir))
+
+	if err := database.Start(); err != nil {
+		shutdownDBAndFail(t, err, database)
+	}
+
+	if err := database.Stop(); err != nil {
+		shutdownDBAndFail(t, err, database)
+	}
+}
+
 func Test_CustomBinariesLocation(t *testing.T) {
 	tempDir, err := os.MkdirTemp("", "prepare_database_test")
 	if err != nil {