/usr/sbin/isenkram-autoinstall-firmware is in isenkram-cli 0.18+deb8u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | #!/bin/sh
#
# Find missing firmware files requested by the kernel, and install the
# binary packages with the files.  Fetch them the from the non-free section
# if that is needed.
#
# This script was copied from auto-addfirmware from the debian-edu-config
# package and extended here.
dist=$(lsb_release -cs)
if [ "n/a" = "$dist" ] ; then
    dist=testing
fi
arch=$(dpkg --print-architecture)
mirror=http://httpredir.debian.org/debian
aptsourcelist=/etc/apt/sources.list.d/isenkram-autoinstall-firmware.list
loginfo() {
    echo "info: $@" 1>&2
}
add_contrib_nonfree() {
    cat <<EOF > $aptsourcelist
deb $mirror $dist contrib non-free
deb-src $mirror $dist contrib non-free
EOF
    chmod a+r $aptsourcelist
}
# Find firmware files requested by loaded kernel drivers.
for fwfile in $(for module in $(awk '{print $1}' /proc/modules) ; do modinfo $module 2>/dev/null |awk '/^firmware:/ {print $2}'; done|sort -u); do
    if [ ! -e /lib/firmware/$fwfile ] ; then
	fwfiles="${fwfiles:+$fwfiles }$fwfile"
    fi
done
# Also look in dmesg for requested firmware for modules that refuse to
# load without their firmware.  See also bug #725714.
for fwfile in $(dmesg | sed -rn 's/^(\[[^]]*\] )?([^ ]+) [^ ]+: firmware: failed to load ([^ ]+) .*/\3/p'); do
    loginfo "looking for firmware file $fwfile requested by kernel"
    if [ ! -e /lib/firmware/$fwfile ] ; then
        fwfiles="${fwfiles:+$fwfiles }$fwfile"
    fi
done
if [ -z "$fwfiles" ] ; then
    loginfo "did not find any firmware files requested by loaded kernel modules.  exiting"
    exit 1
fi
loginfo "some kernel driver requested extra firmware files:" $fwfiles
tmpdir=$(mktemp -d)
cd $tmpdir || exit 1
cleanup() {
    cd /
    rm -rf $tmpdir
}
# Try to fetch updated data, but use local copy too just in case this
# fail.
for section in "main" "contrib" "non-free"; do
    # "" is main in Wheezy.
    if [  main = "$section" ] && [ wheezy = "$dist" ]; then
	url="$mirror/dists/$dist/Contents-$arch.gz"
    else
	url="$mirror/dists/$dist/$section/Contents-$arch.gz"
    fi
    loginfo "fetching $url"
    curl --location $url | gunzip | grep ^lib/firmware > Fw-Contents-$arch-$dist-$section
done
datafiles=""
for f in Fw-Contents-$arch-$dist-* \
    /usr/share/isenkram/Fw-Contents-$arch-$dist-* ; do
    if [ -s "$f" ] ; then
	datafiles="$datafiles $f"
    fi
done
if [ "$datafiles" ] ; then
    loginfo "locating packages with the requested firmware files"
    binpkginfos=""
    binpkgs=""
    for fwfile in $fwfiles ; do
	fwfilere=$(echo $fwfile | sed -e 's%/%\\/%g' -e 's/\./\\./g')
	binpkginfo="$(awk "/^lib\/firmware\/$fwfilere/ {print \$2}" $datafiles)"
	if [ -z "$binpkginfo" ] ; then
	# Special case for b43 where the firmware is undistributable
	# by Debian.
	    case "$fwfile" in
		b43/*)
		    add_contrib_nonfree
		    binpkgs="${binpkgs:+$binpkgs }firmware-b43-installer"
		    ;;
	    esac
	else
	    binpkginfos="$binpkginfos $binpkginfo"
	fi
    done
else
    loginfo "unable to find any firmware info for dist $dist"
fi
binpkgs="${binpkgs:+$binpkgs }$(
for binpkginfo in $binpkginfos ; do
    echo $binpkginfo |  while IFS=/ read section srcpkg binpkg ; do
        echo $binpkg
# Enable the non-free section if it is needed
	if LC_ALL=C apt-cache show $binpkg 2>&1 | \
               grep -q 'E: No packages found' \
           && ( [ non-free = "$section" ] \
               || [ contrib = "$section" ] ) ; then 
	    add_contrib_nonfree
	fi
    done
done)"
if [ -e $aptsourcelist ] ; then
    # Fetch updated package lists
    loginfo "Updating APT sources after adding non-free APT source"
    apt-get -qq update
fi
if [ "$binpkgs" ] ; then
    if [ "-l" = "$1" ] ; then
	echo $binpkgs | tr " " "\n" | sort -u
    else
        # Install firmware packages
	loginfo "trying to install $binpkgs"
	apt-get -qq install -y $binpkgs
    fi
else
    loginfo "No new firmware package with requested firmware detected."
fi
cleanup
 |