libparted: Add ChromeOS Kernel partition flag

This adds a GPT-only partition type flag, chromeos_kernel, for use on
Chrome OS machines, with GUID FE3A2A5D-4F32-41A7-B725-ACCC3285A309.

The firmware/bootloader in these machines relies on special images being
written to partitions of this type. Among multiple such partitions, it
decides which one it will boot from based on the GUID-specific partition
attributes. This patch is not intended to and does not manipulate these
bits.

Google refers to these partitions as "ChromeOS kernel" partitions. They
also define partitions for rootfs, firmware, and a reserved one; but
these are not necessary for the boot flow and are not included here.

Relevant ChromiumOS documentation:
https://www.chromium.org/chromium-os/chromiumos-design-docs/disk-format

Signed-off-by: Alper Nebi Yasak <alpernebiyasak@gmail.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/libparted/labels/gpt.c b/libparted/labels/gpt.c
index 8e9500b..b8b58cd 100644
--- a/libparted/labels/gpt.c
+++ b/libparted/labels/gpt.c
@@ -156,6 +156,10 @@ typedef struct
     ((efi_guid_t) { PED_CPU_TO_LE32 (0xD3BFE2DE), PED_CPU_TO_LE16 (0x3DAF), \
                     PED_CPU_TO_LE16 (0x11DF), 0xba, 0x40, \
                     { 0xE3, 0xA5, 0x56, 0xD8, 0x95, 0x93 }})
+#define PARTITION_CHROMEOS_KERNEL_GUID \
+    ((efi_guid_t) { PED_CPU_TO_LE32 (0xfe3a2a5d), PED_CPU_TO_LE16 (0x4f32), \
+                    PED_CPU_TO_LE16 (0x41a7), 0xb7, 0x25, \
+                    { 0xac, 0xcc, 0x32, 0x85, 0xa3, 0x09 }})
 
 struct __attribute__ ((packed)) _GuidPartitionTableHeader_t
 {
@@ -303,6 +307,7 @@ typedef struct _GPTPartitionData
   int legacy_boot;
   int prep;
   int irst;
+  int chromeos_kernel;
 } GPTPartitionData;
 
 static PedDiskType gpt_disk_type;
@@ -826,6 +831,7 @@ _parse_part_entry (PedDisk *disk, GuidPartitionEntry_t *pte)
     = gpt_part_data->legacy_boot
     = gpt_part_data->prep
     = gpt_part_data->irst
+    = gpt_part_data->chromeos_kernel
     = gpt_part_data->bios_grub = gpt_part_data->atvrecv = 0;
 
   if (pte->Attributes.RequiredToFunction & 0x1)
@@ -857,6 +863,8 @@ _parse_part_entry (PedDisk *disk, GuidPartitionEntry_t *pte)
     gpt_part_data->prep = 1;
   else if (!guid_cmp (gpt_part_data->type, PARTITION_IRST_GUID))
     gpt_part_data->irst = 1;
+  else if (!guid_cmp (gpt_part_data->type, PARTITION_CHROMEOS_KERNEL_GUID))
+    gpt_part_data->chromeos_kernel = 1;
 
   return part;
 }
@@ -1377,6 +1385,7 @@ gpt_partition_new (const PedDisk *disk,
   gpt_part_data->prep = 0;
   gpt_part_data->translated_name = 0;
   gpt_part_data->irst = 0;
+  gpt_part_data->chromeos_kernel = 0;
   uuid_generate ((unsigned char *) &gpt_part_data->uuid);
   swap_uuid_and_efi_guid (&gpt_part_data->uuid);
   memset (gpt_part_data->name, 0, sizeof gpt_part_data->name);
@@ -1507,6 +1516,11 @@ gpt_partition_set_system (PedPartition *part,
       gpt_part_data->type = PARTITION_IRST_GUID;
       return 1;
     }
+  if (gpt_part_data->chromeos_kernel)
+    {
+      gpt_part_data->type = PARTITION_CHROMEOS_KERNEL_GUID;
+      return 1;
+    }
 
   if (fs_type)
     {
@@ -1653,6 +1667,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_BIOS_GRUB:
@@ -1668,6 +1683,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_RAID:
@@ -1683,6 +1699,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_LVM:
@@ -1698,6 +1715,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_SWAP:
@@ -1713,6 +1731,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_HPSERVICE:
@@ -1728,6 +1747,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_MSFT_RESERVED:
@@ -1743,6 +1763,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_MSFT_DATA:
@@ -1758,6 +1779,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
         gpt_part_data->msftdata = 1;
       } else {
@@ -1777,6 +1799,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftres
           = gpt_part_data->prep
           = gpt_part_data->irst
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_APPLE_TV_RECOVERY:
@@ -1791,6 +1814,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftres
           = gpt_part_data->msftdata
           = gpt_part_data->prep
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->msftrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_PREP:
@@ -1805,6 +1829,7 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftres
           = gpt_part_data->irst
           = gpt_part_data->atvrecv
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->msftrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_IRST:
@@ -1820,8 +1845,25 @@ gpt_partition_set_flag (PedPartition *part, PedPartitionFlag flag, int state)
           = gpt_part_data->msftdata
           = gpt_part_data->msftrecv
           = gpt_part_data->prep
+          = gpt_part_data->chromeos_kernel
           = gpt_part_data->atvrecv = 0;
       return gpt_partition_set_system (part, part->fs_type);
+    case PED_PARTITION_CHROMEOS_KERNEL:
+      gpt_part_data->chromeos_kernel = state;
+      if (state)
+        gpt_part_data->boot
+          = gpt_part_data->bios_grub
+          = gpt_part_data->raid
+          = gpt_part_data->lvm
+          = gpt_part_data->swap
+          = gpt_part_data->hp_service
+          = gpt_part_data->msftres
+          = gpt_part_data->msftdata
+          = gpt_part_data->msftrecv
+          = gpt_part_data->atvrecv
+          = gpt_part_data->prep
+          = gpt_part_data->irst = 0;
+      return gpt_partition_set_system (part, part->fs_type);
     case PED_PARTITION_HIDDEN:
       gpt_part_data->hidden = state;
       return 1;
@@ -1874,6 +1916,8 @@ gpt_partition_get_flag (const PedPartition *part, PedPartitionFlag flag)
       return gpt_part_data->irst;
     case PED_PARTITION_SWAP:
 	return gpt_part_data->swap;
+    case PED_PARTITION_CHROMEOS_KERNEL:
+      return gpt_part_data->chromeos_kernel;
     case PED_PARTITION_LBA:
     case PED_PARTITION_ROOT:
     default:
@@ -1903,6 +1947,7 @@ gpt_partition_is_flag_available (const PedPartition *part,
     case PED_PARTITION_PREP:
     case PED_PARTITION_IRST:
     case PED_PARTITION_ESP:
+    case PED_PARTITION_CHROMEOS_KERNEL:
       return 1;
     case PED_PARTITION_ROOT:
     case PED_PARTITION_LBA: