binfmt.d(5)

NAME

   binfmt.d - Configure additional binary formats for executables at boot

SYNOPSIS

   /etc/binfmt.d/*.conf

   /run/binfmt.d/*.conf

   /usr/lib/binfmt.d/*.conf

DESCRIPTION

   At boot, systemd-binfmt.service(8) reads configuration files from the
   above directories to register in the kernel additional binary formats
   for executables.

CONFIGURATION FORMAT

   Each file contains a list of binfmt_misc kernel binary format rules.
   Consult binfmt_misc.txt[1] for more information on registration of
   additional binary formats and how to write rules.

   Empty lines and lines beginning with ; and # are ignored. Note that
   this means you may not use ; and # as delimiter in binary format rules.

CONFIGURATION DIRECTORIES AND PRECEDENCE

   Configuration files are read from directories in /etc/, /run/, and
   /lib/, in order of precedence. Each configuration file in these
   configuration directories shall be named in the style of filename.conf.
   Files in /etc/ override files with the same name in /run/ and /lib/.
   Files in /run/ override files with the same name in /lib/.

   Packages should install their configuration files in /lib/. Files in
   /etc/ are reserved for the local administrator, who may use this logic
   to override the configuration files installed by vendor packages. All
   configuration files are sorted by their filename in lexicographic
   order, regardless of which of the directories they reside in. If
   multiple files specify the same option, the entry in the file with the
   lexicographically latest name will take precedence. It is recommended
   to prefix all filenames with a two-digit number and a dash, to simplify
   the ordering of the files.

   If the administrator wants to disable a configuration file supplied by
   the vendor, the recommended way is to place a symlink to /dev/null in
   the configuration directory in /etc/, with the same filename as the
   vendor configuration file. If the vendor configuration file is included
   in the initrd image, the image has to be regenerated.

EXAMPLE

   Example 1. /etc/binfmt.d/wine.conf example:

       # Start WINE on Windows executables
       :DOSWin:M::MZ::/usr/bin/wine:

SEE ALSO

   systemd(1), systemd-binfmt.service(8), systemd-delta(1), wine(8)

NOTES

    1. binfmt_misc.txt
       https://www.kernel.org/doc/Documentation/binfmt_misc.txt

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