feat: Add support for IEEE1275 booting

Adaptation of a solution provided by Ryutaroh.

2 files changed, 36 insertions, 5 deletions

diff --git a/vmdb/plugins/grub.mdwn b/vmdb/plugins/grub.mdwn
index 037d4d3..75314f8 100644
--- a/vmdb/plugins/grub.mdwn
+++ b/vmdb/plugins/grub.mdwn
@@ -2,8 +2,9 @@ Step: grub
 -----------------------------------------------------------------------------
 
 Install the GRUB bootloader to the image. Works on a PC for
-traditional BIOS booting and both a PC and arm64 machines for modern
-UEFI booting. Does not (yet?) support Secure Boot.
+traditional BIOS booting, PC and ARM machines for modern
+UEFI booting, and PowerPC machines for IEEE1275 booting. Supports Secure Boot
+for amd64 UEFI.
 
 Warning: This is the least robust part of vmdb2.
 
@@ -16,7 +17,10 @@ Step keys:
 * `tag` — REQUIRED; value is the tag for the root filesystem.
 
 * `efi` — REQUIRED for UEFI; value is the tag for the EFI
-  filesystem.
+  partition.
+
+* `prep` — REQUIRED for IEEE1275; value is the tag for the
+  PReP partition.
 
 * `console` — OPTIONAL; set to `serial` to configure the image
   to use a serial console.
@@ -35,13 +39,21 @@ Example (in the .vmdb file):
     - grub: bios
       tag: root
 
-Same, but for UEFI:
+Same, but for UEFI, assuming that a FAT32 filesystem exists on the
+partition with tag `efi`:
 
     - grub: uefi
       tag: root
       efi: efi
       console: serial
 
+Or for IEEE1275, assuming that a partition with tag `prep` exists:
+
+    - grub: ieee1275
+      tag: root
+      prep: prep
+      console: serial
+
 Install to a real hard disk (named with the `--image` option):
 
     - grub: uefi
diff --git a/vmdb/plugins/grub_plugin.py b/vmdb/plugins/grub_plugin.py
index 7905c97..b57ce72 100644
--- a/vmdb/plugins/grub_plugin.py
+++ b/vmdb/plugins/grub_plugin.py
@@ -88,6 +88,7 @@ class GrubStepRunner(vmdb.StepRunnerInterface):
             "root-fs": "",
             "efi": "",
             "efi-part": "",
+            "prep": "",
             "console": "",
             "tag": "",
             "image-dev": "",
@@ -102,6 +103,8 @@ class GrubStepRunner(vmdb.StepRunnerInterface):
             self.install_uefi(values, settings, state)
         elif flavor == "bios":
             self.install_bios(values, settings, state)
+        elif flavor == "ieee1275":
+            self.install_ieee1275(values, settings, state)
         else:
             raise Exception("Unknown GRUB flavor {}".format(flavor))
 
@@ -135,6 +138,12 @@ class GrubStepRunner(vmdb.StepRunnerInterface):
         grub_target = "i386-pc"
         self.install_grub(values, settings, state, grub_package, grub_target)
 
+    def install_ieee1275(self, values, settings, state):
+        vmdb.progress("Installing GRUB for IEEE1275")
+        grub_package = "grub-ieee1275"
+        grub_target = "powerpc-ieee1275"
+        self.install_grub(values, settings, state, grub_package, grub_target)
+
     def install_grub(self, values, settings, state, grub_package, grub_target):
         console = values["console"] or None
 
@@ -155,11 +164,21 @@ class GrubStepRunner(vmdb.StepRunnerInterface):
         else:
             efi_dev = None
 
+        prep = values["prep"] or None
+        if prep:
+            prep_dev = state.tags.get_dev(prep)
+        else:
+            prep_dev = None
+
         quiet = values["quiet"]
 
-        self.bind_mount_many(chroot, ["/dev", "/sys"], state)
+        self.bind_mount_many(chroot, ["/dev", "/sys", "/proc"], state)
         if efi_dev:
             self.mount(chroot, efi_dev, "/boot/efi", state)
+        elif prep_dev:
+            pn = prep_dev[-1]
+            vmdb.runcmd(["parted", "-s", image_dev, "set", pn, "prep", "on" ])
+            image_dev = prep_dev
         self.install_package(chroot, grub_package)
 
         kernel_params = [