Set default storage from containers.conf for temporary images

Fixes: https://github.com/containers/podman/issues/11107

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

vendor/github.com/containers/common/pkg/config/config.go

@@ -234,6 +234,9 @@ type EngineConfig struct {
 	// EventsLogger determines where events should be logged.
 	EventsLogger string `toml:"events_logger,omitempty"`
 
+	// graphRoot internal stores the location of the graphroot
+	graphRoot string
+
 	// HelperBinariesDir is a list of directories which are used to search for
 	// helper binaries.
 	HelperBinariesDir []string `toml:"helper_binaries_dir"`
@@ -384,6 +387,12 @@ type EngineConfig struct {
 	// before sending kill signal.
 	StopTimeout uint `toml:"stop_timeout,omitempty"`
 
+	// ImageCopyTmpDir is the default location for storing temporary
+	// container image content,  Can be overridden with the TMPDIR
+	// environment variable.  If you specify "storage", then the
+	// location of the container/storage tmp directory will be used.
+	ImageCopyTmpDir string `toml:"image_copy_tmp_dir,omitempty"`
+
 	// TmpDir is the path to a temporary directory to store per-boot container
 	// files. Must be stored in a tmpfs.
 	TmpDir string `toml:"tmp_dir,omitempty"`
@@ -1148,3 +1157,22 @@ func (c *Config) FindHelperBinary(name string, searchPATH bool) (string, error)
 	}
 	return "", errors.Errorf("could not find %q in one of %v", name, c.Engine.HelperBinariesDir)
 }
+
+// ImageCopyTmpDir default directory to store tempory image files during copy
+func (c *Config) ImageCopyTmpDir() (string, error) {
+	if path, found := os.LookupEnv("TMPDIR"); found {
+		return path, nil
+	}
+	switch c.Engine.ImageCopyTmpDir {
+	case "":
+		return "", nil
+	case "storage":
+		return filepath.Join(c.Engine.graphRoot, "tmp"), nil
+	default:
+		if filepath.IsAbs(c.Engine.ImageCopyTmpDir) {
+			return c.Engine.ImageCopyTmpDir, nil
+		}
+	}
+
+	return "", errors.Errorf("invalid image_copy_tmp_dir value %q (relative paths are not accepted)", c.Engine.ImageCopyTmpDir)
+}