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Add partial Linux support to installer

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This commit is contained in:
Lauri Kenttä
2023-08-23 21:03:49 +03:00
parent 7dbdf33ea8
commit de9d0d984a
1 changed files with 32 additions and 0 deletions
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32
src/Efi.cs
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@@ -135,10 +135,22 @@ public class Efi {
public const string EFI_GLOBAL_GUID = "{8be4df61-93ca-11d2-aa0d-00e098032b8c}";
public const string LinuxEfiDir = "/sys/firmware/efi/efivars";
/**
* Enable the privilege to access EFI variables.
*/
public static void EnablePrivilege() {
if (Directory.Exists(LinuxEfiDir)) {
var linuxEfiFile = $"{LinuxEfiDir}/BootOrder-8be4df61-93ca-11d2-aa0d-00e098032b8c";
if (File.Exists(linuxEfiFile)) {
using (FileStream fs = File.OpenWrite(linuxEfiFile)) {
// OpenWrite throws an exception on error.
}
}
return;
}
const int SE_PRIVILEGE_ENABLED = 0x00000002;
const int TOKEN_QUERY = 0x00000008;
const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;
@@ -176,6 +188,17 @@ public class Efi {
result.Guid = guid;
result.Data = null;
result.Attributes = 0;
if (Directory.Exists(LinuxEfiDir)) {
var linuxEfiFile = $"{LinuxEfiDir}/{name}-{guid.Substring(1, guid.Length - 2)}";
if (File.Exists(linuxEfiFile)) {
var d = File.ReadAllBytes(linuxEfiFile);
result.Attributes = (UInt32)(d[0] + 0x100 * d[1] + 0x10000 * d[2] + 0x1000000 * d[3]);
result.Data = d.Skip(4).ToArray();
}
return result;
}
for (UInt32 i = 4096; i <= 1024*1024; i *= 2) {
byte[] buf = new byte[i];
UInt32 len = GetFirmwareEnvironmentVariableEx(name, guid, buf, (UInt32) buf.Length, out result.Attributes);
@@ -214,6 +237,15 @@ public class Efi {
return;
}
if (Directory.Exists(LinuxEfiDir)) {
var linuxEfiFile = $"{LinuxEfiDir}/{v.Name}-{v.Guid.Substring(1, v.Guid.Length - 2)}";
var a = v.Attributes;
var b = new byte[] { (byte) a, (byte) (a >> 8), (byte) (a >> 16), (byte) (a >> 24) };
// FIXME: Just writing won't work: File.WriteAllBytes(linuxEfiFile, b.Concat(v.Data).ToArray());
Console.WriteLine("FIXME: Can't yet write EFI variables in Linux.");
return;
}
UInt32 r = SetFirmwareEnvironmentVariableEx(v.Name, v.Guid, v.Data, (UInt32) v.Data.Length, v.Attributes);
if (r == 0) {
switch (Marshal.GetLastWin32Error()) {