m/p/gpt: add GPT package
This introduces our own GPT package. It will be used for provisioning
and Metropolis images.
Change-Id: I905cd5d540673fd4b69c01d8975f98b88e24edd4
Reviewed-on: https://review.monogon.dev/c/monogon/+/956
Tested-by: Jenkins CI
Reviewed-by: Sergiusz Bazanski <serge@monogon.tech>
diff --git a/metropolis/pkg/gpt/linux_test.go b/metropolis/pkg/gpt/linux_test.go
new file mode 100644
index 0000000..19ac519
--- /dev/null
+++ b/metropolis/pkg/gpt/linux_test.go
@@ -0,0 +1,51 @@
+package gpt
+
+import (
+ "os"
+ "testing"
+
+ "github.com/google/uuid"
+ "golang.org/x/sys/unix"
+)
+
+var testUUID = uuid.MustParse("85c0b60f-caf9-40dd-86fa-f8797e26238d")
+
+func TestKernelInterop(t *testing.T) {
+ if os.Getenv("IN_KTEST") != "true" {
+ t.Skip("Not in ktest")
+ }
+ ram0, err := os.OpenFile("/dev/ram0", os.O_RDWR, 0)
+ if err != nil {
+ panic(err)
+ }
+ g := Table{
+ ID: uuid.NewSHA1(testUUID, []byte("test")),
+ BlockSize: 512,
+ BlockCount: 2048,
+ BootCode: []byte("just some test code"),
+ Partitions: []*Partition{
+ nil,
+ // This emoji is very complex and exercises UTF16 surrogate encoding
+ // and composing.
+ {Name: "Test 🏃♂️", FirstBlock: 10, LastBlock: 19, Type: PartitionTypeEFISystem, ID: uuid.NewSHA1(testUUID, []byte("test1")), Attributes: AttrNoBlockIOProto},
+ nil,
+ {Name: "Test2", FirstBlock: 20, LastBlock: 49, Type: PartitionTypeEFISystem, ID: uuid.NewSHA1(testUUID, []byte("test2")), Attributes: 0},
+ },
+ }
+ if err := Write(ram0, &g); err != nil {
+ t.Fatalf("Failed to write GPT: %v", err)
+ }
+
+ if err := unix.IoctlSetInt(int(ram0.Fd()), unix.BLKRRPART, 0); err != nil {
+ t.Fatalf("Failed to reread partition table: %v", err)
+ }
+ if _, err := os.Stat("/sys/block/ram0/ram0p2"); err != nil {
+ t.Errorf("Expected ram0p2 to exist, got %v", err)
+ }
+ if _, err := os.Stat("/sys/block/ram0/ram0p4"); err != nil {
+ t.Errorf("Expected ram0p4 to exist, got %v", err)
+ }
+ if _, err := os.Stat("/sys/block/ram0/ram0p1"); err == nil {
+ t.Error("Expected ram0p1 not to exist, but it exists")
+ }
+}