[Bug 1877088] Re: [UBUNTU 20.04] installkernel script does not symlink /boot/initrd.img which is required with the default zipl.conf

[Stefan Bader]

Could someone try to put the attached script into /etc/kernel/postinst.d
and let me know whether that make installkernel work? Thanks.

** Attachment added: "Copy to /etc/kernel/postinst.d/xx-update-initrd-links"
   https://bugs.launchpad.net/ubuntu/+source/linux-base/+bug/1877088/+attachment/5441001/+files/xx-update-initrd-links

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Title:
  [UBUNTU 20.04] installkernel script does not symlink /boot/initrd.img
  which is required with the default zipl.conf

Status in Ubuntu on IBM z Systems:
  Triaged
Status in debianutils package in Ubuntu:
  New
Status in linux-base package in Ubuntu:
  New

Bug description:
  When testing development kernels I usually rely on the installkernel
  script either through the "make install" target of the Kernel source
  or manually. This used to work great on Ubuntu on Z.

  On Ubuntu 20.04 (freshly installed up to date) this fails however because
  /boot/initrd.img is not updated (/boot/vmlinuz is) and thus zipl installs the
  wrong kernel/initrd combination rendering the system unbootable.

  (with the correct modules already copied to /usr/lib/modules/5.7.0-rc4-06500-gb67ea026badd/)
  # sudo installkernel 5.7.0-rc4-06500-gb67ea026badd bzImage System.map /boot
  run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  run-parts: executing /etc/kernel/postinst.d/initramfs-tools 5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  update-initramfs: Generating /boot/initrd.img-5.7.0-rc4-06500-gb67ea026badd
  Using config file '/etc/zipl.conf'
  Building bootmap in '/boot'
  Building menu 'menu'
  Adding #1: IPL section 'ubuntu' (default)
  Adding #2: IPL section 'old'
  Preparing boot device: dasda (3844).
  Done.
  run-parts: executing /etc/kernel/postinst.d/zz-zipl 5.7.0-rc4-06500-gb67ea026badd /boot/vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  Using config file '/etc/zipl.conf'
  Building bootmap in '/boot'
  Building menu 'menu'
  Adding #1: IPL section 'ubuntu' (default)
  Adding #2: IPL section 'old'
  Preparing boot device: dasda (3844).
  Done.
  # ls -l /boot
  total 178364
  -rw------- 1 root root    135168 May  6 11:52 bootmap
  -rw-r--r-- 1 root root     90471 Apr 29 15:34 config-5.4.0-29-generic
  lrwxrwxrwx 1 root root        27 May  6 11:40 initrd.img -> initrd.img-5.4.0-29-generic   <====== should point to new version
  -rw-r--r-- 1 root root  19663996 May  6 11:42 initrd.img-5.4.0-29-generic
  -rw-r--r-- 1 root root 125339494 May  6 11:52 initrd.img-5.7.0-rc4-06500-gb67ea026badd
  lrwxrwxrwx 1 root root        27 May  6 11:40 initrd.img.old -> initrd.img-5.4.0-29-generic
  -rw------- 1 root root   3087920 Apr 29 15:34 System.map-5.4.0-29-generic
  -rw-r--r-- 1 root root   4031691 May  6 11:52 System.map-5.7.0-rc4-06500-gb67ea026badd
  -rw-r--r-- 1 root root   4031691 May  6 11:49 System.map-5.7.0-rc4-06500-gb67ea026badd.old
  lrwxrwxrwx 1 root root        37 May  6 11:52 vmlinuz -> vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  -rw------- 1 root root   8086072 Apr 29 15:54 vmlinuz-5.4.0-29-generic
  -rw-r--r-- 1 root root   9080832 May  6 11:52 vmlinuz-5.7.0-rc4-06500-gb67ea026badd
  -rw-r--r-- 1 root root   9080832 May  6 11:49 vmlinuz-5.7.0-rc4-06500-gb67ea026badd.old
  lrwxrwxrwx 1 root root        41 May  6 11:52 vmlinuz.old -> vmlinuz-5.7.0-rc4-06500-gb67ea026badd.old

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