Add support for containers.conf volume timeouts

Also, do a general cleanup of all the timeout code. Changes
include:
- Convert from int to *uint where possible. Timeouts cannot be
  negative, hence the uint change; and a timeout of 0 is valid,
  so we need a new way to detect that the user set a timeout
  (hence, pointer).
- Change name in the database to avoid conflicts between new data
  type and old one. This will cause timeouts set with 4.2.0 to be
  lost, but considering nobody is using the feature at present
  (and the lack of validation means we could have invalid,
  negative timeouts in the DB) this feels safe.
- Ensure volume plugin timeouts can only be used with volumes
  created using a plugin. Timeouts on the local driver are
  nonsensical.
- Remove the existing test, as it did not use a volume plugin.
  Write a new test that does.

The actual plumbing of the containers.conf timeout in is one line
in volume_api.go; the remainder are the above-described cleanups.

Signed-off-by: Matthew Heon <mheon@redhat.com>

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

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/exec"
 	"path/filepath"
+	"runtime"
 	"sort"
 	"strings"
 	"sync"
@@ -27,6 +28,8 @@ const (
 	_configPath = "containers/containers.conf"
 	// UserOverrideContainersConfig holds the containers config path overridden by the rootless user
 	UserOverrideContainersConfig = ".config/" + _configPath
+	// Token prefix for looking for helper binary under $BINDIR
+	bindirPrefix = "$BINDIR"
 )
 
 // RuntimeStateStore is a constant indicating which state store implementation
@@ -454,6 +457,13 @@ type EngineConfig struct {
 	// may not be by other drivers.
 	VolumePath string `toml:"volume_path,omitempty"`
 
+	// VolumePluginTimeout sets the default timeout, in seconds, for
+	// operations that must contact a volume plugin. Plugins are external
+	// programs accessed via REST API; this sets a timeout for requests to
+	// that API.
+	// A value of 0 is treated as no timeout.
+	VolumePluginTimeout uint `toml:"volume_plugin_timeout,omitempty,omitzero"`
+
 	// VolumePlugins is a set of plugins that can be used as the backend for
 	// Podman named volumes. Each volume is specified as a name (what Podman
 	// will refer to the plugin as) mapped to a path, which must point to a
@@ -815,6 +825,18 @@ func (c *Config) Validate() error {
 	return nil
 }
 
+// URI returns the URI Path to the machine image
+func (m *MachineConfig) URI() string {
+	uri := m.Image
+	for _, val := range []string{"$ARCH", "$arch"} {
+		uri = strings.Replace(uri, val, runtime.GOARCH, 1)
+	}
+	for _, val := range []string{"$OS", "$os"} {
+		uri = strings.Replace(uri, val, runtime.GOOS, 1)
+	}
+	return uri
+}
+
 func (c *EngineConfig) findRuntime() string {
 	// Search for crun first followed by runc, kata, runsc
 	for _, name := range []string{"crun", "runc", "runj", "kata", "runsc"} {
@@ -1241,10 +1263,37 @@ func (c *Config) ActiveDestination() (uri, identity string, err error) {
 	return "", "", errors.New("no service destination configured")
 }
 
+var (
+	bindirFailed = false
+	bindirCached = ""
+)
+
+func findBindir() string {
+	if bindirCached != "" || bindirFailed {
+		return bindirCached
+	}
+	execPath, err := os.Executable()
+	if err == nil {
+		// Resolve symbolic links to find the actual binary file path.
+		execPath, err = filepath.EvalSymlinks(execPath)
+	}
+	if err != nil {
+		// If failed to find executable (unlikely to happen), warn about it.
+		// The bindirFailed flag will track this, so we only warn once.
+		logrus.Warnf("Failed to find $BINDIR: %v", err)
+		bindirFailed = true
+		return ""
+	}
+	bindirCached = filepath.Dir(execPath)
+	return bindirCached
+}
+
 // FindHelperBinary will search the given binary name in the configured directories.
 // If searchPATH is set to true it will also search in $PATH.
 func (c *Config) FindHelperBinary(name string, searchPATH bool) (string, error) {
 	dirList := c.Engine.HelperBinariesDir
+	bindirPath := ""
+	bindirSearched := false
 
 	// If set, search this directory first. This is used in testing.
 	if dir, found := os.LookupEnv("CONTAINERS_HELPER_BINARY_DIR"); found {
@@ -1252,6 +1301,24 @@ func (c *Config) FindHelperBinary(name string, searchPATH bool) (string, error)
 	}
 
 	for _, path := range dirList {
+		if path == bindirPrefix || strings.HasPrefix(path, bindirPrefix+string(filepath.Separator)) {
+			// Calculate the path to the executable first time we encounter a $BINDIR prefix.
+			if !bindirSearched {
+				bindirSearched = true
+				bindirPath = findBindir()
+			}
+			// If there's an error, don't stop the search for the helper binary.
+			// findBindir() will have warned once during the first failure.
+			if bindirPath == "" {
+				continue
+			}
+			// Replace the $BINDIR prefix with the path to the directory of the current binary.
+			if path == bindirPrefix {
+				path = bindirPath
+			} else {
+				path = filepath.Join(bindirPath, strings.TrimPrefix(path, bindirPrefix+string(filepath.Separator)))
+			}
+		}
 		fullpath := filepath.Join(path, name)
 		if fi, err := os.Stat(fullpath); err == nil && fi.Mode().IsRegular() {
 			return fullpath, nil