upgrade to restic v0.9.4 and replace --hostname with --host

Signed-off-by: Steve Kriss <[email protected]>

Dockerfile-velero.alpine

@@ -19,9 +19,9 @@ MAINTAINER Andy Goldstein <[email protected]>
 RUN apk add --no-cache ca-certificates
 
 RUN apk add --update --no-cache bzip2 && \
-    wget --quiet https://github.com/restic/restic/releases/download/v0.9.3/restic_0.9.3_linux_amd64.bz2 && \
-    bunzip2 restic_0.9.3_linux_amd64.bz2 && \
-    mv restic_0.9.3_linux_amd64 /usr/bin/restic && \
+    wget --quiet https://github.com/restic/restic/releases/download/v0.9.4/restic_0.9.4_linux_amd64.bz2 && \
+    bunzip2 restic_0.9.4_linux_amd64.bz2 && \
+    mv restic_0.9.4_linux_amd64 /usr/bin/restic && \
     chmod +x /usr/bin/restic
 
 ADD /bin/linux/amd64/velero /velero

pkg/restic/command_factory.go

@@ -23,7 +23,7 @@ import (
 
 // BackupCommand returns a Command for running a restic backup.
 func BackupCommand(repoIdentifier, passwordFile, path string, tags map[string]string) *Command {
-	// --hostname flag is provided with a generic value because restic uses the hostname
+	// --host flag is provided with a generic value because restic uses the host
 	// to find a parent snapshot, and by default it will be the name of the daemonset pod
 	// where the `restic backup` command is run. If this pod is recreated, we want to continue
 	// taking incremental backups rather than triggering a full one due to a new pod name.
@@ -34,7 +34,7 @@ func BackupCommand(repoIdentifier, passwordFile, path string, tags map[string]st
 		PasswordFile:   passwordFile,
 		Dir:            path,
 		Args:           []string{"."},
-		ExtraFlags:     append(backupTagFlags(tags), "--hostname=velero"),
+		ExtraFlags:     append(backupTagFlags(tags), "--host=velero"),
 	}
 }
 

pkg/restic/command_factory_test.go

@@ -32,7 +32,7 @@ func TestBackupCommand(t *testing.T) {
 	assert.Equal(t, "path", c.Dir)
 	assert.Equal(t, []string{"."}, c.Args)
 
-	expected := []string{"--tag=foo=bar", "--tag=c=d", "--hostname=velero"}
+	expected := []string{"--tag=foo=bar", "--tag=c=d", "--host=velero"}
 	sort.Strings(expected)
 	sort.Strings(c.ExtraFlags)
 	assert.Equal(t, expected, c.ExtraFlags)