hook update-grub
先執行
$ sudo update-grub
顯示
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-28-generic
Found initrd image: /boot/initrd.img-4.4.0-28-generic
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
然後延續上一篇「update linux-generic」觀察到的訊息。
...略...
Setting up linux-image-4.4.0-28-generic (4.4.0-28.47) ...
Running depmod.
update-initramfs: deferring update (hook will be called later)
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-28-generic
Found initrd image: /boot/initrd.img-4.4.0-28-generic
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
...略...
觀看「/var/lib/dpkg/info/linux-image-4.4.0-28-generic.postinst」這個「Maintainer Script」，查詢「postinst.d」
$ less /var/lib/dpkg/info/linux-image-4.4.0-28-generic.postinst
可以找到一段perl程式碼
#! /usr/bin/perl
# ...略...
# Ignore all invocations except when called on to configure.
exit 0 unless $ARGV[0] =~ /configure/;
# ...略...
if (-d "/etc/kernel/postinst.d") {
print STDERR "Examining /etc/kernel/postinst.d.\n";
system ("run-parts --verbose --exit-on-error --arg=$version " .
"--arg=$realimageloc$kimage-$version " .
"/etc/kernel/postinst.d") &&
die "Failed to process /etc/kernel/postinst.d";
}
if (-d "/etc/kernel/postinst.d/$version") {
print STDERR "Examining /etc/kernel/postinst.d/$version.\n";
system ("run-parts --verbose --exit-on-error --arg=$version " .
"--arg=$realimageloc$kimage-$version " .
"/etc/kernel/postinst.d/$version") &&
die "Failed to process /etc/kernel/postinst.d/$version";
}
# ...略...
從一開始的訊息「Examining /etc/kernel/postinst.d.」，
然後透過「run-parts」這個指令，執行「/etc/kernel/postinst.d」這個資料夾裡面的檔案。
執行
$ ls /etc/kernel/postinst.d/ -l
顯示
total 20
-rwxr-xr-x 1 root root 2704 Apr 14 15:45 apt-auto-removal
-rwxr-xr-x 1 root root 858 Feb 17 2014 initramfs-tools
-rwxr-xr-x 1 root root 196 Feb 15 17:26 pm-utils
-rwxr-xr-x 1 root root 73 Feb 19 06:19 unattended-upgrades
lrwxrwxrwx 1 root root 49 Apr 22 13:38 update-notifier -> /usr/share/update-notifier/notify-reboot-required
-rwxr-xr-x 1 root root 646 Mar 16 02:08 zz-update-grub
執行
dpkg -S /etc/kernel/postinst.d/
顯示
update-notifier-common, unattended-upgrades, pm-utils, initramfs-tools, grub-pc, apt: /etc/kernel/postinst.d
執行
$ dpkg -S /etc/kernel/postinst.d/zz-update-grub
顯示
grub-pc: /etc/kernel/postinst.d/zz-update-grub
執行
$ cat /etc/kernel/postinst.d/zz-update-grub
顯示
#! /bin/sh
set -e
which update-grub >/dev/null 2>&1 || exit 0
if type systemd-detect-virt >/dev/null 2>&1 &&
systemd-detect-virt --quiet --container; then
exit 0
fi
set -- $DEB_MAINT_PARAMS
mode="${1#\'}"
mode="${mode%\'}"
case $0:$mode in
# Only run on postinst configure and postrm remove, to avoid wasting
# time by calling update-grub multiple times on upgrade and removal.
# Also run if we have no DEB_MAINT_PARAMS, in order to work with old
# kernel packages.
*/postinst.d/*:|*/postinst.d/*:configure|*/postrm.d/*:|*/postrm.d/*:remove)
if [ -e /boot/grub/grub.cfg ]; then
exec update-grub
fi
;;
esac
exit 0
延續上一篇「update linux-generic」觀察到的另一段訊息。
Setting up linux-image-extra-4.4.0-28-generic (4.4.0-28.47) ...
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-28-generic
Found initrd image: /boot/initrd.img-4.4.0-28-generic
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
觀看「/var/lib/dpkg/info/linux-image-extra-4.4.0-28-generic.postinst」這個這個「Maintainer Script」，
執行
$ less /var/lib/dpkg/info/linux-image-extra-4.4.0-28-generic.postinst
顯示
#!/bin/sh
set -e
case "$0::$1" in
*.postinst::configure|*.postrm::remove)
depmod -a -F /boot/System.map-4.4.0-28-generic 4.4.0-28-generic || true
for dir in "/etc/kernel/postinst.d" "/etc/kernel/postinst.d/4.4.0-28-generic"
do
if [ -d "$dir" ]; then
run-parts --verbose --exit-on-error --arg="4.4.0-28-generic" --arg="/boot/vmlinuz-4.4.0-28-generic" "$dir"
fi
done
;;
esac
概念上跟上面的差不多，就不再贅述了。
測試
註: 以下指令，我尚未確認是否會有什麼副作用，所以請在測試系統測試。
linux-image-4.4.0-28-generic
執行
$ sudo /var/lib/dpkg/info/linux-image-4.4.0-28-generic.postinst configure
或是執行
$ sudo dpkg-reconfigure linux-image-4.4.0-28-generic
顯示
Running depmod.
update-initramfs: Generating /boot/initrd.img-4.4.0-28-generic
initrd.img(/boot/initrd.img-4.4.0-28-generic
) points to /boot/initrd.img-4.4.0-28-generic
(/boot/initrd.img-4.4.0-28-generic) -- doing nothing at /var/lib/dpkg/info/linux-image-4.4.0-28-generic.postinst line 491.
vmlinuz(/boot/vmlinuz-4.4.0-28-generic
) points to /boot/vmlinuz-4.4.0-28-generic
(/boot/vmlinuz-4.4.0-28-generic) -- doing nothing at /var/lib/dpkg/info/linux-image-4.4.0-28-generic.postinst line 491.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-28-generic
Found initrd image: /boot/initrd.img-4.4.0-28-generic
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
linux-image-extra-4.4.0-28-generic
執行
$ sudo /var/lib/dpkg/info/linux-image-extra-4.4.0-28-generic.postinst configure
或是執行
$ sudo dpkg-reconfigure linux-image-extra-4.4.0-28-generic
顯示
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/pm-utils 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/unattended-upgrades 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/update-notifier 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
run-parts: executing /etc/kernel/postinst.d/zz-update-grub 4.4.0-28-generic /boot/vmlinuz-4.4.0-28-generic
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-4.4.0-28-generic
Found initrd image: /boot/initrd.img-4.4.0-28-generic
Found linux image: /boot/vmlinuz-4.4.0-21-generic
Found initrd image: /boot/initrd.img-4.4.0-21-generic
Found memtest86+ image: /boot/memtest86+.elf
Found memtest86+ image: /boot/memtest86+.bin
done
manpage
- man 8 run-parts
- man 8 dpkg-reconfigure
package
concept
- Debian Wiki / MaintainerScripts
- Ubuntu Community Help Wiki / MetaPackages