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LINUX-UPDATE-SYMLINKS(1) General Commands Manual LINUX-UPDATE-SYMLINKS(1)
NAME
linux-update-symlinks - maintain symlinks to default kernel and initramfs
SYNOPSIS
linux-update-symlinks {install|upgrade|remove} VERSION IMAGE-PATH
DESCRIPTION
linux-update-symlinks is intended to be called from the postinst and postrm maintainer
scripts of Linux kernel packages. The postinst script must pass the first argument in-
stall or upgrade depending on whether a fresh installation or an upgrade has taken place.
The VERSION argument must be the kernel version string as shown by uname -r and used in
filenames.
The IMAGE-PATH argument must be the absolute filename of the kernel image.
By default, this command maintains symlinks in the root directory. This behaviour can be
modified by settings in /etc/kernel-img.conf:
image_dest
Specifies the directory in which to maintain symlinks
link_in_boot
If set to a true value, specifies that the directory is /boot
no_symlinks
If set to a false value, disables maintenance of symlinks
The symlinks for the primary default kernel version are named vmlinuz or vmlinux (depend-
ing on whether the architecture normally uses compressed kernel images) and initrd.img (if
it uses an initramfs). The symlinks for the secondary default have the same names with
the suffix .old.
If symlink maintenance is disabled, linux-update-symlinks does nothing, successfully.
Otherwise it makes a list of kernel versions in decreasing order of priority:
o The given VERSION, if the first argument is install
o The current primary default version, if it exists and is not already listed
o The current secondary default version, if it exists and is not already listed
o All other versions whose files are installed, excluding the specified VERSION if the
first argument is remove, in decreasing version order
The top two entries on the list are the new primary and secondary default versions, and it
updates the symlinks accordingly. In case there is only one entry, this is both the pri-
mary and secondary default version. If there are no entries, there are no default ver-
sions and it removes the default symlinks.
ENVIRONMENT VARIABLES
INITRD When the first argument is install or upgrade, linux-update-symlinks assumes that
the given VERSION will use an initramfs unless this variable is set to No.
FILES
/boot/initrd.img-*
Installed initramfs images
/boot/vmlinuz-* | /boot/vmlinux-*
Installed kernel images
/etc/kernel-img.conf
Configuration file specifying whether and where to create symlinks
/initrd.img
Symlink to the initramfs image for the primary default version
/initrd.img.old
Symlink to the initramfs image for the secondary default version
/vmlinuz | /vmlinux
Symlink to the kernel image for the primary default version
/vmlinuz.old | /vmlinux.old
Symlink to the kernel image for the secondary default version
AUTHOR
linux-update-symlinks and this manual page were written by Ben Hutchings as part of the
Debian linux-base package.
SEE ALSO
kernel-img.conf(5), linux-version(1).
5 June 2016 LINUX-UPDATE-SYMLINKS(1)
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