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error with /usr/sbin/grub-mkconfig Read-only file system??



This was strange. I had not seen this before :

run-parts: executing /etc/kernel/postinst.d/zz-update-grub
5.12.12-genunix /boot/vmlinux-5.12.12-genunix
/usr/sbin/grub-mkconfig: 257: cannot create /boot/grub/grub.cfg.new:
Read-only file system
run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 2
make[1]: *** [arch/powerpc/boot/Makefile:445: install] Error 1
make: *** [arch/powerpc/Makefile:409: install] Error 2


enceladus# ls -lap  /boot/grub/
total 101
drwxr-xr-x 1 root root    10 Jun 11 03:42 ./
drwxr-xr-x 3 root root  4096 Jun 22 17:45 ../
drwxr-xr-x 1 root root     3 Apr 16 09:17 fonts/
-rw-r--r-- 1 root root 86272 May 10 19:44 grub
-r--r--r-- 1 root root 11362 Jun 11 03:42 grub.cfg
-rw-r--r-- 1 root root  1024 Apr 16 09:17 grubenv
drwxr-xr-x 1 root root    42 May 10 19:44 locale/
-rw-r--r-- 1 root root     0 Apr 16 09:17 mach_kernel
drwxr-xr-x 1 root root   216 May 10 19:44 powerpc-ieee1275/
drwxr-xr-x 1 root root     3 Apr 16 09:17 System/
enceladus# touch /boot/grub/foo
touch: cannot touch '/boot/grub/foo': Read-only file system
enceladus#

Wow.  How the heck did that happen?

enceladus# blkid
/dev/sdb1: LABEL="swap2" UUID="7c38680c-02c1-429e-876c-48357af6ccb8"
TYPE="swap" PARTUUID="23af4d24-ca63-b34b-ada0-5ab4c20f4362"
/dev/sdb2: UUID="967da6b0-8a05-4894-b44c-cafebd009c5b" BLOCK_SIZE="4096"
TYPE="ext4" PARTUUID="e1aa5f9c-b575-3d4e-88e1-fc767d45009b"
/dev/sda1: PARTLABEL="Apple"
/dev/sda2: UUID="221a37cd-0cfb-3f7a-91da-78edee6f1382" LABEL="untitled"
TYPE="hfs" PARTLABEL="untitled"
/dev/sda3: UUID="be025229-d079-46ab-bf39-175a71ceea76" BLOCK_SIZE="4096"
TYPE="ext4" PARTLABEL="untitled"
/dev/sda4: UUID="9becc701-38d3-4468-b708-834280305893" TYPE="swap"
PARTLABEL="swap"
/dev/sda5: PARTLABEL="Extra"
enceladus#

OKay so the handling of HFS must be borked in some way.

enceladus#
enceladus# df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            3.9G     0  3.9G   0% /dev
tmpfs           800M  6.8M  793M   1% /run
/dev/sda3       273G   14G  246G   6% /
tmpfs           4.0G     0  4.0G   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
/dev/sdb2       131G   38G   87G  31% /usr/local
/dev/sda2       245M   11M  234M   5% /boot/grub
tmpfs           800M     0  800M   0% /run/user/16411
enceladus#

enceladus# uname -a
Linux enceladus 5.12.10-genunix #1 SMP Fri Jun 11 02:22:17 EDT 2021
ppc64 GNU/Linux
enceladus#

That is my kernel compile running just fine and perhaps I did an
apt-get update and/or upgrade and some hfs handling thing is borked.

So these old PowerMac things need that HFS partition to boot and it
seems something strange has happened ( again ) with the boot process.

Is this a known thing?

-- 
Dennis Clarke
RISC-V/SPARC/PPC/ARM/CISC
UNIX and Linux spoken
GreyBeard and suspenders optional


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