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72 lines
3.4 KiB
72 lines
3.4 KiB
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Daniel Axtens <dja@axtens.net>
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Date: Thu, 24 Mar 2022 14:34:32 +1100
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Subject: [PATCH] powerpc: prefix detection: support device names with commas
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Frustratingly, the device name itself can contain an embedded comma:
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e.g /pci@800000020000015/pci1014,034A@0/sas/disk@5000c50098a0ee8b
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So my previous approach was wrong: we cannot rely upon the presence
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of a comma to say that a partition has been specified!
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It turns out for prefixes like (,gpt2)/grub2 we really want to make
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up a full (device,partition)/patch prefix, because root discovery code
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in 10_linux will reset the root variable and use search to fill it again.
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If you have run grub-install, you probably don't have search built in,
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and if you don't have prefix containing (device,partition), grub will
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construct ($root)$prefix/powerpc-ieee1275/search.mod - but because $root
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has just been changed, this will no longer work, and the boot will fail!
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Retain the gist of the logic, but instead of looking for a comma, look for
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a leading '('. This matches the earlier code better anyway.
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There's certainly a better fix to be had. But any time you chose to build
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with a bare prefix like '/grub2', you're almost certainly going to build in
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search anyway, so this will do.
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Signed-off-by: Daniel Axtens <dja@axtens.net>
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---
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grub-core/kern/main.c | 27 +++++++++++++++++++++------
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1 file changed, 21 insertions(+), 6 deletions(-)
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diff --git a/grub-core/kern/main.c b/grub-core/kern/main.c
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index 993b8a8598..e94a2f78fb 100644
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--- a/grub-core/kern/main.c
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+++ b/grub-core/kern/main.c
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@@ -242,14 +242,29 @@ grub_set_prefix_and_root (void)
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what sorts of paths represent disks with partition tables and those
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without partition tables.
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- So we act unless there is a comma in the device, which would indicate
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- a partition has already been specified.
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+ - Frustratingly, the device name itself can contain an embedded comma:
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+ /pci@800000020000015/pci1014,034A@0/sas/disk@5000c50098a0ee8b
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+ So we cannot even rely upon the presence of a comma to say that a
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+ partition has been specified!
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- (If we only have a path, the code in normal to discover config files
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- will try both without partitions and then with any partitions so we
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- will cover both CDs and HDs.)
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+ If we only have a path in $prefix, the code in normal to discover
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+ config files will try all disks, both without partitions and then with
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+ any partitions so we will cover both CDs and HDs.
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+
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+ However, it doesn't then set the prefix to be something like
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+ (discovered partition)/path, and so it is fragile against runtime
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+ changes to $root. For example some of the stuff done in 10_linux to
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+ reload $root sets root differently and then uses search to find it
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+ again. If the search module is not built in, when we change root, grub
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+ will look in (new root)/path/powerpc-ieee1275, that won't work, and we
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+ will not be able to load the search module and the boot will fail.
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+
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+ This is particularly likely to hit us in the grub-install
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+ (,msdos2)/grub2 case, so we act unless the supplied prefix starts with
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+ '(', which would likely indicate a partition has already been
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+ specified.
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*/
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- if (grub_strchr (device, ',') == NULL)
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+ if (prefix && prefix[0] != '(')
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grub_env_set ("prefix", path);
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else
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#endif
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