NAME

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

SYNOPSIS

           /etc/binfmt.d/*.conf
           /run/binfmt.d/*.conf
           /usr/local/lib/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 the kernel's Kernel Support
       for miscellaneous Binary Formats (binfmt_misc)[1] documentation file 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 those
       symbols as the delimiter in binary format rules.

CONFIGURATION DIRECTORIES AND PRECEDENCE

       Configuration files are read from directories in /etc/, /run/, /usr/local/lib/, and /usr/lib/, in order
       of precedence, as listed in the SYNOPSIS section above. Files must have the ".conf" extension. Files in
       /etc/ override files with the same name in /run/, /usr/local/lib/, and /usr/lib/. Files in /run/ override
       files with the same name under /usr/.

       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. Thus, the configuration in a certain file may either
       be replaced completely (by placing a file with the same name in a directory with higher priority), or
       individual settings might be changed (by specifying additional settings in a file with a different name
       that is ordered later).

       Packages should install their configuration files in /usr/lib/ (distribution packages) or /usr/local/lib/
       (local installs) [2]. Files in /etc/ are reserved for the local administrator, who may use this logic to
       override the configuration files installed by vendor packages.

       It is recommended to prefix all filenames with a two-digit number and a dash to simplify the ordering. It
       is recommended to use the range 10-40 for configuration files in /usr/ and the range 60-90 for
       configuration files in /etc/ and /run/, to make sure that local and transient configuration files will
       always take priority over configuration files shipped by the OS vendor.

       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. Kernel Support for miscellaneous Binary Formats (binfmt_misc)
           https://docs.kernel.org/admin-guide/binfmt-misc.html

        2. 💣💥🧨💥💥💣 Please note that those configuration files must be available at all times. If /usr/local/
           is a separate partition, it may not be available during early boot, and must not be used for
           configuration.