KERNEL-IMG.CONF(5) Debian GNU/Linux manual KERNEL-IMG.CONF(5) NAME kernel-img.conf - configuration file for Linux kernel packages SYNOPSIS /etc/kernel-img.conf DESCRIPTION The file /etc/kernel-img.conf is used by the kernel package installa- tion and removal process to allow local options for handling some as- pects of the installation. Most configuration variables apply only to kernel image packages. Not all kernel image package creators support this file, or all the configuration variables. Support status for the file itself is: Package creator Status Debian linux source package supported Ubuntu linux source package supported kernel-package supported make deb-pkg ignored The format of the file is a simple VAR=VALUE pair. Boolean values may be specified as Yes, True, 1, and No, False, 0, and are case insensi- tive. This file is automatically created by the installation script in certain circumstances. At the moment, the user modifiable variables supported are: do_symlinks If set, the postinst and postrm scripts will maintain symlinks to default kernel and initramfs images, as described in linux-update-symlinks(8). This variable is set by default. Package creator Status Debian linux source package supported Ubuntu linux source package supported kernel-package ignored since v12.001; previously supported image_dest Set this variable to the directory in which symlinks to the de- fault kernel and initramfs images should be maintained. The de- fault value is /. Package creator Status Debian linux source package supported Ubuntu linux source package supported kernel-package ignored since v12.001; previously supported link_in_boot If set, this has the same effect as image_dest = /boot and over- rides any other setting of image_dest. This variable is unset by default. Package creator Status Debian linux source package supported Ubuntu linux source package supported kernel-package ignored since v12.001; previously supported postinst_hook DEPRECATED: Set this variable to a script to be executed during installation. The path can be a relative path if the script lives in a safe path -- that is, if it lives in /bin, /sbin, /usr/bin, or /usr/sbin, or must be an absolute path instead. Be- fore calling this script, the environment variable STEM shall be set to the value of the --stem argument (or the default value, linux), and in packages created by kernel-package KERNEL_PACK- AGE_VERSION shall be set to the version of the kernel-package that created the package. This script shall be called with two arguments, the first being the version of the kernel image, and the second argument being the location of the kernel image it- self. Errors in the script shall cause the postinst to fail. Since debconf is in use before the script is called, this script should issue no diagnostic messages to stdout -- while the postinst does call db_stop, debconf does not restore stdout, so messages to stdout disappear. An example script for grub users is present in /usr/share/doc/kernel-package/ directory. This script is run after the scripts in /etc/kernel/postinst.d direc- tory. Package creator Status Debian linux source package unsupported since v4.6.1-1; previously supported Ubuntu linux source package unsupported since v4.15.0-18.19; previously supported kernel-package deprecated postrm_hook DEPRECATED: Set this variable to a script to be executed in the postrm (that is, after the image has been removed) after all the remove actions have been performed. The path can be a relative path if the script lives in a safe path -- that is, if it lives in /bin, /sbin, /usr/bin, or /usr/sbin, or must be an absolute path instead. In packages created by kernel-package, the envi- ronment variable KERNEL_PACKAGE_VERSION shall be set to the ver- sion of the kernel-package that created the package. This script shall be called with two arguments, the first being the version of the kernel image, and the second argument being the location of the kernel image itself. Errors in the script shall produce a warning message, but shall be otherwise ignored. Since debconf is in use before the script is called, this script should issue no diagnostic messages to stdout -- while the postinst does call db_stop, debconf does not restore stdout, so messages to stdout disappear. This script is run after the scripts in /etc/kernel/postrm.d directory. Package creator Status Debian linux source package unsupported since v4.6.1-1; previously supported Ubuntu linux source package unsupported since v4.15.0-18.19; previously supported kernel-package deprecated preinst_hook DEPRECATED: Set this variable to a script to be executed before the package is unpacked, and can be used to put in additional checks. The path can be a relative path if the script lives in a safe path -- that is, if it lives in /bin, /sbin, /usr/bin, or /usr/sbin, or must be an absolute path instead. In packages cre- ated by kernel-package, the environment variable KERNEL_PACK- AGE_VERSION shall be set to the version of the kernel-package that created the package. This script shall be called with two arguments, the first being the version of the kernel image, and the second argument being the location of the kernel image it- self. This script is run after the scripts in /etc/kernel/pre- inst.d directory. Package creator Status Debian linux source package unsupported since v4.6.1-1; previously supported Ubuntu linux source package unsupported since v4.15.0-18.19; previously supported kernel-package deprecated prerm_hook DEPRECATED: Set this variable to a script to be executed before the package files are removed (so any added files may be re- moved) . The path can be a relative path if the script lives in a safe path -- that is, if it lives in /bin, /sbin, /usr/bin, or /usr/sbin, or must be an absolute path instead. In packages cre- ated by kernel-package, the environment variable KERNEL_PACK- AGE_VERSION shall be set to the version of the kernel-package that created the package. This script shall be called with two arguments, the first being the version of the kernel image, and the second argument being the location of the kernel image it- self. Errors in the script shall cause the prerm to fail. Since debconf is in use before the script is called, this script should issue no diagnostic messages to stdout -- while the postinst does call db_stop, debconf does not restore stdout, so messages to stdout disappear. This script is run after the scripts in /etc/kernel/prerm.d directory. Package creator Status Debian linux source package unsupported since v4.6.1-1; previously supported Ubuntu linux source package unsupported since v4.15.0-18.19; previously supported kernel-package deprecated src_postinst_hook DEPRECATED: Unlike the other hook variables, this is meant for a script run during the post inst of a docs, headers or a source package. Using this hook for the headers package is now being deprecated, at some point the headers post install script shall only run the header_postinst_hook. The path can be a relative path if the script lives in a safe path -- that is, if it lives in /bin, /sbin, /usr/bin, or /usr/sbin, or must be an absolute path instead. The environment variable KERNEL_PACKAGE_VERSION shall be set to the version of the kernel-package that created the package. This script shall be called with two arguments, the first being the name of the package being installed (could be kernel source or headers), and the second argument being the version of the package being installed. Errors in the script shall cause the postinst to fail. This script is run after the scripts in /etc/kernel/src_postinst.d directory. Package creator Status Debian linux source package unsupported Ubuntu linux source package unsupported kernel-package deprecated header_postinst_hook DEPRECATED: Unlike the other hook variables, this is meant for a script run during the post inst of a headers package only. The path can be a relative path if the script lives in a safe path -- that is, if it lives in /bin, /sbin, /usr/bin, or /usr/sbin, or must be an absolute path instead. In packages created by ker- nel-package, the environment variable KERNEL_PACKAGE_VERSION shall be set to the version of the kernel-package that created the package. This script shall be called with two arguments, the first being the name of the package being installed, and the second argument being the version of the package being in- stalled. Errors in the script shall cause the postinst to fail. This script is run after the scripts in /etc/ker- nel/header_postinst.d directory. Package creator Status Debian linux source package unsupported Ubuntu linux source package unsupported since v4.15.0-18.19; previously supported kernel-package deprecated clobber_modules If set, the preinst shall silently try to move /lib/modules/ver- sion out of the way if it is the same version as the image being installed. Use at your own risk. This variable is unset by de- fault. Package creator Status Debian linux source package ignored Ubuntu linux source package ignored kernel-package supported warn_reboot This variable can be used to turn off the warning given when in- stalling a kernel image which is the same version as the cur- rently running version. If the modules list is changed, the mod- ules dependencies may have been changed, and the modules for the new kernel may not run correctly on the running kernel if the kernel ABI has changed in the meanwhile. It is a good idea to reboot, and this is a note to remind you. If you know what you are doing, you can set this variable to no. This variable is set by default. Package creator Status Debian linux source package ignored Ubuntu linux source package ignored kernel-package supported relink_build_link This option manipulates the build link created by recent ker- nels. If the link is a dangling link, and if a the corresponding kernel headers appear to have been installed on the system, a new symlink shall be created to point to them. The default is to relink the build link (YES). Package creator Status Debian linux source package ignored Ubuntu linux source package ignored kernel-package supported force_build_link This option manipulates the build link created by recent ker- nels. If the link is a dangling link, a new symlink shall be created to point to kernel headers data in /usr/src, whether they have been installed or not. The default is unset, we don't create potentially dangling symlinks by default. Package creator Status Debian linux source package ignored Ubuntu linux source package ignored kernel-package supported relink_src_link This option manipulates the source link created by recent ker- nels. If the link is a dangling link it is deleted at install time. The default is to relink (delete) the source link (YES). Package creator Status Debian linux source package ignored Ubuntu linux source package ignored kernel-package supported silent_modules This option has been put in for the people who are vastly irri- tated on being warned about preexisting modules directory /lib/modules/$version. That directory may belong to an old or defunct kernel image package, in which case problems may arise with leftover modules in that directory tree, or the directory may legitimately exist due to a independent modules package be- ing installed for this kernel version that has already been un- packed. In this latter case the existence of the directory is benign. If you set this variable, you shall no longer be given a chance to abort if a preexisting modules directory /lib/mod- ules/$version is detected. This is unset by default. Package creator Status Debian linux source package ignored Ubuntu linux source package ignored kernel-package supported ignore_depmod_err If set, does not prompt to continue after a depmod problem in the postinst script. This facilitates automated installs, though it may mask a problem with the kernel image. A diagnostic is still issued. This is unset by default. Package creator Status Debian linux source package unsupported since v4.4.1-1~exp1; previously supported Ubuntu linux source package unsupported since v4.15.0-18.19; previously ignored kernel-package supported FILES The file described here is /etc/kernel-img.conf. kernel-common in- cludes example scripts suitable for dropping into /etc/kernel/*.d in- stalled in /usr/share/doc/kernel-common/examples. SEE ALSO linux-update-symlinks(8), make-kpkg(1), kernel-pkg.conf(5) AUTHOR This manual page was written by Manoj Srivastava <srivasta@debian.org> and Ben Hutchings <benh@debian.org> for the Debian GNU/Linux system. Debian 24 March 2019 KERNEL-IMG.CONF(5)
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