fidzu : kernel

What do you think this does:

class A(object):
 def aa(self):
 return 'A1'
class A(object):
 def aa(self):
 return 'A2'
a = A()
print("%s" % a.aa())

It prints "A2".

But before you think "what's the big deal, the __dict__ of A is getting updated", how about this:

class A(object):
 def aa(self):
 return 'A1'
class A(object):
 def bb(self):
 return 'A2'
a = A()
print("%s" % a.aa())

This fails with "AttributeError: 'A' object has no attribute 'aa'".

Apparently, the latter definition replaces the former completely. This is darkly amusing.

Python 3.12.2

18 Apr 2024 2:44am GMT

Problem:
When copying from tmux in gnome-terminal, the text is full of whitespace. How do I delete it in gvim?

Solution:
/ \+$

Obviously.

This is an area where tmux is a big regression from screen. Too bad.

16 Apr 2024 8:26pm GMT

Problem: After an update to F39, a system continues to boot F38 kernels

The /bin/kernel-install generates entries in /boot/efi/loader/entries instead of /boot/loader/entries. Also, they are in BLS Type 1 format, and not in the legacy GRUB format. So I cannot copy them over.

Solution:
[root@chihiro zaitcev]# dnf install ostree
[root@chihiro zaitcev]# rm -rf /boot/efi/$(cat /etc/machine-id) /boot/efi/loader/

I've read a bunch of docs and the man page for kernel-install(8), but they are incomprehensible. Still the key insight was that all that Systemd stuff loves to autodetect by finding this directory or that.

The way to test is:
[root@chihiro zaitcev]# /bin/kernel-install -v add 6.8.5-201.fc39.x86_64 /lib/modules/6.8.5-201.fc39.x86_64/vmlinuz

15 Apr 2024 5:51pm GMT