vm_concierge: Add message to delete a vm disk

If a user wants to free up disk space or restart their VM from scratch
the existing disk needs to be deleted. Add a message to allow that.

BUG=815359
TEST=with other changes, vmc destroy <vm name>

Change-Id: I5131859c6a17d4332c9ecc8e97876029fd44e5aa
Reviewed-on: https://chromium-review.googlesource.com/935194
Commit-Ready: Dylan Reid <dgreid@chromium.org>
Tested-by: Dylan Reid <dgreid@chromium.org>
Reviewed-by: Stephen Barber <smbarber@chromium.org>

2 files changed, 29 insertions, 0 deletions

diff --git a/dbus/vm_concierge/dbus-constants.h b/dbus/vm_concierge/dbus-constants.h
index 454b644..43ca67e 100644
--- a/dbus/vm_concierge/dbus-constants.h
+++ b/dbus/vm_concierge/dbus-constants.h
@@ -17,6 +17,7 @@ const char kStopVmMethod[] = "StopVm";
 const char kStopAllVmsMethod[] = "StopAllVms";
 const char kGetVmInfoMethod[] = "GetVmInfo";
 const char kCreateDiskImageMethod[] = "CreateDiskImage";
+const char kDestroyDiskImageMethod[] = "DestroyDiskImage";
 
 }  // namespace concierge
 }  // namespace vm_tools
diff --git a/dbus/vm_concierge/service.proto b/dbus/vm_concierge/service.proto
index 9606aaf..f4be796 100644
--- a/dbus/vm_concierge/service.proto
+++ b/dbus/vm_concierge/service.proto
@@ -149,6 +149,12 @@ enum DiskImageStatus {
 
   // Unable to create the disk image.
   DISK_STATUS_FAILED = 3;
+
+  // Specified Disk does not exist.
+  DISK_STATUS_DOES_NOT_EXIST = 4;
+
+  // The specified disk was destroyed.
+  DISK_STATUS_DESTROYED = 5;
 }
 
 // Request to concierge to create a disk image.
@@ -182,3 +188,25 @@ message CreateDiskImageResponse {
   // The failure reason if the disk image could not be created or doesn't exist.
   string failure_reason = 3;
 }
+
+// Request to concierge to destroy a disk image.
+message DestroyDiskImageRequest {
+  // The cryptohome id for the user's encrypted storage.
+  string cryptohome_id = 1;
+
+  // The path to the disk image. This must be a relative path.
+  string disk_path = 2;
+
+  // The storage location for the disk image.
+  StorageLocation storage_location = 3;
+}
+
+// Response to a DestroyDiskImageRequest.
+message DestroyDiskImageResponse {
+  // If DISK_STATUS_DESTROYED, the disk image has been successfully destroyed.
+  // If DISK_STATUS_DOES_NOT_EXIST, the disk image had already been removed.
+  DiskImageStatus status = 1;
+
+  // The failure reason if the disk image could not be destroyed or doesn't exist.
+  string failure_reason = 3;
+}