partitioning: Add partattrs property to partition

Add a 'partattrs' property to partitions. It allows the GPT partition
attribute bits to be set for a partition. Notably this is needed to set
bits 48 and 56, which are part of the GUID specific range, to allow a
ChromeOS Kernel partition to be booted on Chromebooks.

Signed-off-by: Nícolas F. R. A. Prado <[email protected]>

actions/image_partition_action.go

@@ -58,6 +58,7 @@ a 32 bits hexadecimal number (e.g. '1234ABCD' without any dash separator).
  fsck: bool
  fsuuid: string
  partuuid: string
+ partattrs: list of partition attributes
 
 Mandatory properties:
 
@@ -95,6 +96,9 @@ for partition.
 - flags -- list of additional flags for partition compatible with parted(8)
 'set' command.
 
+- partattrs -- list of GPT partition attribute bits. See description for
+--part-attrs in sfdisk(8) for examples.
+
 - fsck -- if set to `false` -- then set fs_passno (man fstab) to 0 meaning no filesystem
 checks in boot time. By default is set to `true` allowing checks on boot.
 
@@ -187,6 +191,7 @@ type Partition struct {
  Name string
  PartLabel string
  PartType string
+ PartAttrs []string
  PartUUID string
  Start string
  End string
@@ -531,6 +536,13 @@ func (i ImagePartitionAction) Run(context *debos.DebosContext) error {
  }
  }
 
+ if p.PartAttrs != nil {
+ err = debos.Command{}.Run("sfdisk", "sfdisk", "--part-attrs", context.Image, fmt.Sprintf("%d", p.number), strings.Join(p.PartAttrs, ","))
+ if err != nil {
+ return err
+ }
+ }
+
  /* PartUUID will only be set for gpt partitions */
  if len(p.PartUUID) > 0 {
  err = debos.Command{}.Run("sfdisk", "sfdisk", "--part-uuid", context.Image, fmt.Sprintf("%d", p.number), p.PartUUID)