add restic integration for doing pod volume backups/restores

Signed-off-by: Steve Kriss <steve@heptio.com>

pkg/restic/command_factory.go

@@ -0,0 +1,91 @@
+package restic
+
+import (
+	"fmt"
+	"strings"
+)
+
+// BackupCommand returns a Command for running a restic backup.
+func BackupCommand(repoPrefix, repo, passwordFile, path string, tags map[string]string) *Command {
+	return &Command{
+		Command:      "backup",
+		RepoPrefix:   repoPrefix,
+		Repo:         repo,
+		PasswordFile: passwordFile,
+		Args:         []string{path},
+		ExtraFlags:   backupTagFlags(tags),
+	}
+}
+
+func backupTagFlags(tags map[string]string) []string {
+	var flags []string
+	for k, v := range tags {
+		flags = append(flags, fmt.Sprintf("--tag=%s=%s", k, v))
+	}
+	return flags
+}
+
+// RestoreCommand returns a Command for running a restic restore.
+func RestoreCommand(repoPrefix, repo, passwordFile, podUID, snapshotID string) *Command {
+	return &Command{
+		Command:      "restore",
+		RepoPrefix:   repoPrefix,
+		Repo:         repo,
+		PasswordFile: passwordFile,
+		Args:         []string{snapshotID},
+		ExtraFlags:   []string{fmt.Sprintf("--target=/restores/%s", podUID)},
+	}
+}
+
+// GetSnapshotCommand returns a Command for running a restic (get) snapshots.
+func GetSnapshotCommand(repoPrefix, repo, passwordFile string, tags map[string]string) *Command {
+	return &Command{
+		Command:      "snapshots",
+		RepoPrefix:   repoPrefix,
+		Repo:         repo,
+		PasswordFile: passwordFile,
+		ExtraFlags:   []string{"--json", "--last", getSnapshotTagFlag(tags)},
+	}
+}
+
+func getSnapshotTagFlag(tags map[string]string) string {
+	var tagFilters []string
+	for k, v := range tags {
+		tagFilters = append(tagFilters, fmt.Sprintf("%s=%s", k, v))
+	}
+
+	return fmt.Sprintf("--tag=%s", strings.Join(tagFilters, ","))
+}
+
+func InitCommand(repoPrefix, repo string) *Command {
+	return &Command{
+		Command:    "init",
+		RepoPrefix: repoPrefix,
+		Repo:       repo,
+	}
+}
+
+func CheckCommand(repoPrefix, repo string) *Command {
+	return &Command{
+		Command:    "check",
+		RepoPrefix: repoPrefix,
+		Repo:       repo,
+	}
+}
+
+func PruneCommand(repoPrefix, repo string) *Command {
+	return &Command{
+		Command:    "prune",
+		RepoPrefix: repoPrefix,
+		Repo:       repo,
+	}
+}
+
+func ForgetCommand(repoPrefix, repo, snapshotID string) *Command {
+	return &Command{
+		Command:    "forget",
+		RepoPrefix: repoPrefix,
+		Repo:       repo,
+		Args:       []string{snapshotID},
+	}
+}