Moving on with Ubuntu.
Attaching patch for impish for initial review.
** Description changed:
- Upon disabling my grub menu using grub-customizer, I've noticed that
- just before the system boots and goes into the crypto password prompt
- the following error message appears on the display:
+ [Impact]
+
+ * Users on non-pc/i386 platforms (e.g., efi/amd64) may observe
+ the message "error: can't find command `hwmatch'" every boot.
+
+ * Also observed on cloud instances, generating support tickets
+ asking for clarification/impacts. (which could be deflected.)
+
+ * There' little or no impact, as hwmatch is only used to check
+ hardware device ID against a list for issues w/ graphics/KMS.
+ When this error happens, the default is set to keep graphics.
+
+ * This has possibly always happened on non-pc/i386, as hwmatch
+ is patched/exists only in 'grub-core/commands/_i386/pc_' dir,
+ thus there doesn't seem to be any serious issues as a result.
+
+ [Fix]
+
+ * Check for `$grub_platform != pc` then do not call hwmatch;
+ just keep current behavior (ie, keep graphics/framebuffer.)
+
+ [Test Plan]
+
+ * Boot a VM with EFI (e.g., multipass/libvirt/ovmf) and see
+ the serial console show the error message (or not, w/ fix.)
+
+ sudo snap install multipass
+ sudo multipass set local.driver=libvirt
+ sudo snap connect multipass:libvirt
+
+ multipass launch -c 1 -d 4g -m 1g -n hwmatch-i daily:impish
+
+ sudo apt -y install ovmf
+ sudo mkdir -p /var/lib/libvirt/qemu/nvram
+
+ virsh edit hwmatch-i
+ # insert in <os> section:
+ <loader readonly='yes'
type='pflash'>/usr/share/OVMF/OVMF_CODE.fd</loader>
+ <nvram>/var/lib/libvirt/qemu/nvram/hwmatch-i.fd</nvram>
+
+ virsh shutdown hwmatch-i
+ virsh start --console hwmatch-i
+
+ * Before:
+ ...
+ BdsDxe: loading Boot0003 "ubuntu" from ...\shimx64.efi
+ BdsDxe: starting Boot0003 "ubuntu" from ...\shimx64.efi
+ error: can't find command `hwmatch'.
+ [ 0.000000] Linux version ...
+
+ * After:
+ ...
+ BdsDxe: loading Boot0003 "ubuntu" from ...\shimx64.efi
+ BdsDxe: starting Boot0003 "ubuntu" from ...\shimx64.efi
+ [ 0.000000] Linux version ...
+
+ [Where problems could occur]
+
+ * Issues with graphics/flickering during boot on systems with
+ graphics adapters in use might be hit in case of regression.
+
+ * Theoretically the risk is low, since hwmatch apparently has
+ never worked on non-pc/i386, and we replace the broken call
+ while keeping current behavior observed with it ("no change".)
+
+ [Other Info]
+
+ * While it might be interesting to try and enable/fix it for
+ other platforms, let's have a trivial fix to be considered
+ to backport to stable releases, at this time (less changes.)
+
+ * The same behavior is linux_gfx_mode=keep, despite the error.
+ This happens because in the error case, grub shell evaluates
+ if hwmatch ...; then` to true, and `if [ $match = 0 ]; then`
+ to true too (as it's undefined) so `set linux_gfx_mode=keep`.
+
+ Before/After in grub shell (same behavior):
+
+ grub> hwmatch
+ error: can't find command `hwmatch'.
+
+ grub> echo $grub_platform
+ efi
+
+ grub> echo $linux_gfx_mode
+ keep
+
+ * Other details in Debian bug 990836 [1].
+
+ * It looks like grub2-unsigned follows grub2 automatically,
+ so not providing debdiffs to it/just grub2.
+
+ [Links]
+ * [1] https://bugs.debian.org/990836
+
+ [Original Description]
+ Upon disabling my grub menu using grub-customizer, I've noticed that just
before the system boots and goes into the crypto password prompt the following
error message appears on the display:
```
error: can't find command hwmatch
```
Looks like this command is referenced from /boot/grub/grub/cfg
```
- if hwmatch ${prefix}/gfxblacklist.txt 3; then
+ if hwmatch ${prefix}/gfxblacklist.txt 3; then
```
However, the mod doesn't exist on grub's mod folder:
```
~ ls -la /boot/grub/x86_64-efi/*.mod|wc -l
269
~ ls -la /boot/grub/x86_64-efi/hw*
fish: No matches for wildcard “/boot/grub/x86_64-efi/hw*”
```
ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: grub-efi-amd64-signed 1.115+2.02+dfsg1-12ubuntu2
ProcVersionSignature: Ubuntu 5.0.0-25.26-generic 5.0.18
Uname: Linux 5.0.0-25-generic x86_64
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Aug 18 00:22:41 2019
InstallationDate: Installed on 2019-08-17 (0 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
SourcePackage: grub2-signed
UpgradeStatus: No upgrade log present (probably fresh install)
** Patch added: "lp1840560_grub2_impish.debdiff"
https://bugs.launchpad.net/ubuntu/+source/grub2-signed/+bug/1840560/+attachment/5512983/+files/lp1840560_grub2_impish.debdiff
** Also affects: grub2 (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: grub2-signed (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: grub2-signed (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: grub2-signed (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: grub2 (Ubuntu Impish)
Importance: Medium
Assignee: Mauricio Faria de Oliveira (mfo)
Status: In Progress
** Also affects: grub2-signed (Ubuntu Impish)
Importance: Undecided
Status: Invalid
** Changed in: grub2-signed (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: grub2-signed (Ubuntu Groovy)
Status: New => Invalid
** Changed in: grub2-signed (Ubuntu Focal)
Status: New => Invalid
** Changed in: grub2 (Ubuntu Hirsute)
Status: New => In Progress
** Changed in: grub2 (Ubuntu Hirsute)
Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)
** Changed in: grub2 (Ubuntu Groovy)
Status: New => Invalid
** Changed in: grub2 (Ubuntu Focal)
Status: New => In Progress
** Changed in: grub2 (Ubuntu Focal)
Assignee: (unassigned) => Mauricio Faria de Oliveira (mfo)
** Changed in: grub2 (Ubuntu Impish)
Importance: Medium => Low
** Changed in: grub2 (Ubuntu Hirsute)
Importance: Undecided => Low
** Changed in: grub2 (Ubuntu Focal)
Importance: Undecided => Low
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https://bugs.launchpad.net/bugs/1840560
Title:
"error: can't find command hwmatch" during grub
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