Method getDBVersionFromVolume

pkg/ddevapp/db.go:32–94

getDBVersionFromVolume inspects the database volume to determine version info Returns the raw version string found in the volume, or empty string if none found

()

// getDBVersionFromVolume inspects the database volume to determine version info
// Returns the raw version string found in the volume, or empty string if none found
func (app *DdevApp) getDBVersionFromVolume() (string, error) {
	// Command to check for database version files:
	// 1. MySQL/MariaDB: /var/tmp/mysql/db_mariadb_version.txt
	// 2. PostgreSQL <=17: /var/tmp/postgres/PG_VERSION
	// 3. PostgreSQL 18+: /var/tmp/postgres/[version]/docker/PG_VERSION (check common versions)
	cmd := []string{"sh", "-c", `
		# Check MySQL/MariaDB version file
		if [ -f /var/tmp/mysql/db_mariadb_version.txt ]; then
			cat /var/tmp/mysql/db_mariadb_version.txt
			exit 0
		fi

		# Check PostgreSQL version file (pre-18 location)
		if [ -f /var/tmp/postgres/PG_VERSION ]; then
			cat /var/tmp/postgres/PG_VERSION
			exit 0
		fi

		# Check PostgreSQL 18+ version files in version-specific directories
		for version_file in /var/tmp/postgres/*/docker/PG_VERSION; do
			if [ -f "$version_file" ]; then
				cat "$version_file"
				exit 0
			fi
		done

		# No version file found
		exit 0
	`}

	var volumesNeeded []string
	if dockerutil.VolumeExists(app.GetMariaDBVolumeName()) {
		volumesNeeded = append(volumesNeeded, app.GetMariaDBVolumeName()+":/var/tmp/mysql")
	}
	if dockerutil.VolumeExists(app.GetPostgresVolumeName()) {
		volumesNeeded = append(volumesNeeded, app.GetPostgresVolumeName()+":/var/tmp/postgres")
	}
	// No database volumesNeeded exist
	if len(volumesNeeded) == 0 {
		return "", nil
	}

	_, out, err := dockerutil.RunSimpleContainer(
		versionconstants.UtilitiesImage,
		"GetExistingDBType-"+app.Name+"-"+util.RandString(6),
		cmd,
		[]string{}, // envVars
		[]string{}, // uid
		volumesNeeded,
		"",    // workingDir
		true,  // rm
		false, // detach
		map[string]string{`com.ddev.site-name`: ""}, // labels
		nil, // networks
		nil, // healthcheck
	)

	if err != nil {