diff --git a/internal/config/dir.go b/internal/config/dir.go
index b6b797c..949c1a2 100644
--- a/internal/config/dir.go
+++ b/internal/config/dir.go
@@ -9,44 +9,20 @@ import (
 	"syscall"
 )
 
-// HomeDir returns the user's home directory, which can be overridden with the {ENV_PREFIX}HOME variable.
-func (c *Config) HomeDir() (string, error) {
-	d := os.Getenv(c.Application.EnvPrefix + "HOME")
-	if d != "" {
-		return d, nil
-	}
-	return os.UserHomeDir()
-}
-
-// WritableUserDir returns the path to a writable user-level directory.
-func (c *Config) WritableUserDir() (string, error) {
-	if c.writableUserDir != "" {
-		return c.writableUserDir, nil
-	}
-	hd, err := c.HomeDir()
-	if err != nil {
-		return "", err
-	}
-	path := filepath.Join(hd, c.Application.WritableUserDir)
-	if err := os.MkdirAll(path, 0o700); err != nil {
-		return "", err
-	}
-	c.writableUserDir = path
-
-	return path, nil
-}
-
-// TempDir returns the path to a user-specific temporary directory.
+// TempDir returns the path to a user-specific temporary directory, suitable for caches.
 //
 // It creates the temporary directory if it does not already exist.
 //
-// It does not use os.TempDir on Linux as that usually returns /tmp which could
-// conflict with other users. It also does not use os.MkdirTemp as the CLI
-// usually needs a stable (not random) directory path. It therefore uses
-// os.UserCacheDir which in turn will use XDG_CACHE_HOME or the home directory.
+// The directory can be specified in the {ENV_PREFIX}TMP environment variable.
+//
+// This does not use os.TempDir, as on Linux/Unix systems that usually returns a
+// global /tmp directory, which could conflict with other users. It also does not
+// use os.MkdirTemp, as the CLI usually needs a stable (not random) directory
+// path. It therefore uses os.UserCacheDir which in turn will use XDG_CACHE_HOME
+// or the home directory.
 func (c *Config) TempDir() (string, error) {
-	if c.cacheDir != "" {
-		return c.cacheDir, nil
+	if c.tempDir != "" {
+		return c.tempDir, nil
 	}
 	d := os.Getenv(c.Application.EnvPrefix + "TMP")
 	if d == "" {
@@ -77,7 +53,35 @@ func (c *Config) TempDir() (string, error) {
 			return "", err
 		}
 	}
-	c.cacheDir = path
+	c.tempDir = path
 
 	return path, nil
 }
+
+// WritableUserDir returns the path to a writable user-level directory.
+// Deprecated: unless backwards compatibility is desired, TempDir is preferable.
+func (c *Config) WritableUserDir() (string, error) {
+	if c.writableUserDir != "" {
+		return c.writableUserDir, nil
+	}
+	hd, err := c.HomeDir()
+	if err != nil {
+		return "", err
+	}
+	path := filepath.Join(hd, c.Application.WritableUserDir)
+	if err := os.MkdirAll(path, 0o700); err != nil {
+		return "", err
+	}
+	c.writableUserDir = path
+
+	return path, nil
+}
+
+// HomeDir returns the user's home directory, which can be overridden with the {ENV_PREFIX}HOME variable.
+func (c *Config) HomeDir() (string, error) {
+	d := os.Getenv(c.Application.EnvPrefix + "HOME")
+	if d != "" {
+		return d, nil
+	}
+	return os.UserHomeDir()
+}
diff --git a/internal/config/schema.go b/internal/config/schema.go
index ff6eef9..e282370 100644
--- a/internal/config/schema.go
+++ b/internal/config/schema.go
@@ -56,7 +56,7 @@ type Config struct {
 		DomainWildcards []string `validate:"required" yaml:"domain_wildcards"` // e.g. ["*.platform.sh"]
 	} `validate:"required"`
 
-	cacheDir        string `yaml:"-"`
+	tempDir         string `yaml:"-"`
 	writableUserDir string `yaml:"-"`
 }
 
diff --git a/internal/file/file.go b/internal/file/file.go
index b57dad8..44e840a 100644
--- a/internal/file/file.go
+++ b/internal/file/file.go
@@ -47,13 +47,16 @@ func probablyMatches(filename string, data []byte) (bool, error) {
 		return false, nil
 	}
 
-	// Read the end of the file (up to 32 KB).
-	buf := make([]byte, min(32*1024, len(data)))
-	offset := max(0, len(data)-32*1024)
+	return matchEndOfFile(f, data, 32*1024)
+}
+
+func matchEndOfFile(f *os.File, b []byte, size int) (bool, error) {
+	buf := make([]byte, min(size, len(b)))
+	offset := max(0, len(b)-size)
 	n, err := f.ReadAt(buf, int64(offset))
 	if err != nil && err != io.EOF {
 		return false, err
 	}
 
-	return bytes.Equal(data[offset:], buf[:n]), nil
+	return bytes.Equal(b[offset:], buf[:n]), nil
 }