FM / mounted

/usr/libexec/os-probes/mounted

Name	Size	Mode	Actions
efi/	-	0755	rm
05efi	2073	0755	edit dl rm
10freedos	521	0755	edit dl rm
10qnx	394	0755	edit dl rm
20macosx	846	0755	edit dl rm
20microsoft	3451	0755	edit dl rm
30utility	867	0755	edit dl rm
40lsb	895	0755	edit dl rm
70hurd	251	0755	edit dl rm
80minix	435	0755	edit dl rm
83haiku	888	0755	edit dl rm
90linux-distro	5753	0755	edit dl rm
90solaris	389	0755	edit dl rm

Edit: /usr/libexec/os-probes/mounted/90linux-distro (5753B)

#!/usr/bin/sh
# Test for linux distributions.
set -e

. /usr/share/os-prober/common.sh

partition="$1"
dir="$2"
type="$3"
uuid="$4"
subvol="$5"

# This test is inaccurate, but given separate / and /boot partitions and the
# fact that only some architectures have ld-linux.so, I can't see anything
# better. Make sure this test has a high number so that more accurate tests
# can come first.
# Unless volumes to checked are already mounted, they will be mounted using
# GRUB's own filesystems through FUSE. Since these ATM doesn't support
# symlinks we need to also check in $dir/usr/libexec* for distributions that
# moved /lib* to /usr and only left symlinks behind.
# TODO: look for ld-linux.so on arches that have it
#if (ls "$dir"/lib*/ld*.so* && [ -d "$dir/boot" ] || ls "$dir"/usr/libexec*/ld*.so*) >/dev/null 2>/dev/null; then
	if [ -e "$dir/etc/os-release" ]; then
		short="$(grep ^NAME= "$dir/etc/os-release" | sed 's/^[^=]*=//; s/^['\''"]$.*$['\''"]$/\1/; s/\\$.$/\1/g; s/[[:space:]].*//')"
		long="$(grep ^PRETTY_NAME= "$dir/etc/os-release" | sed 's/^[^=]*=//; s/^['\''"]$.*$['\''"]$/\1/; s/\\$.$/\1/g')"
	elif [ -e "$dir/etc/debian_version" ]; then
		short="Debian"
		long="$(printf "Debian GNU/Linux (%s)\n" "$(cat "$dir/etc/debian_version")")"
	# RPM derived distributions may also have a redhat-release or
	# mandrake-release, so check their files first.
	elif [ -e "$dir/etc/altlinux-release" ]; then
		short="ALTLinux"
		long="$(cat "$dir/etc/altlinux-release")"
	elif [ -e "$dir/etc/magic-release" ]; then
		short="Magic"
		long="$(cat "$dir/etc/magic-release")"
	elif [ -e "$dir/etc/blackPanther-release" ]; then
		short="blackPanther"
		long="$(cat "$dir/etc/blackPanther-release")"
	elif [ -e "$dir/etc/ark-release" ]; then
		short="Ark"
		long="$(cat "$dir/etc/ark-release")"
	elif [ -e "$dir/etc/arch-release" ]; then
		short="Arch"
		long="$(cat "$dir/etc/arch-release")"
	elif [ -e "$dir/etc/asplinux-release" ]; then
		short="ASPLinux"
		long="$(cat "$dir/etc/asplinux-release")"
	elif [ -e "$dir/etc/lvr-release" ]; then
		short="LvR"
		long="$(cat "$dir/etc/lvr-release")"
	elif [ -e "$dir/etc/caos-release" ]; then
		short="cAos"
		long="$(cat "$dir/etc/caos-release")"
	elif [ -e "$dir/etc/aurox-release" ]; then
		short="Aurox"
		long="$(cat "$dir/etc/aurox-release")"
	elif [ -e "$dir/etc/engarde-release" ]; then
		short="EnGarde"
		long="$(cat "$dir/etc/engarde-release")"
	elif [ -e "$dir/etc/vine-release" ]; then
		short="Vine"
		long="$(cat "$dir/etc/vine-release")"
	elif [ -e "$dir/etc/whitebox-release" ]; then
		short="WhiteBox"
		long="$(cat "$dir/etc/whitebox-release")"
	elif [ -e "$dir/etc/pld-release" ]; then
		short="PLD"
		long="$(cat "$dir/etc/pld-release")"
	elif [ -e "$dir/etc/startcom-release" ]; then
		short="StartCom"
		long="$(cat "$dir/etc/startcom-release")"
	elif [ -e "$dir/etc/trustix-release" ]; then
		short="Trustix"
		long="$(cat "$dir/etc/trustix-release")"
	elif [ -e "$dir/etc/openna-release" ]; then
		short="OpenNA"
		long="$(cat "$dir/etc/openna-release")"
	elif [ -e "$dir/etc/mageia-release" ]; then
		short="Mageia"
		long="$(cat "$dir/etc/mageia-release")"
	elif [ -e "$dir/etc/conectiva-release" ]; then
		short="Conectiva"
		long="$(cat "$dir/etc/conectiva-release")"
	elif [ -e "$dir/etc/mandrake-release" ]; then
		short="Mandrake"
		long="$(cat "$dir/etc/mandrake-release")"
	elif [ -e "$dir/etc/fedora-release" ]; then
		short="Fedora"
		long="$(cat "$dir/etc/fedora-release")"
	elif [ -e "$dir/etc/redhat-release" ]; then
		short="RedHat"
		long="$(cat "$dir/etc/redhat-release")"
	elif [ -e "$dir/etc/SuSE-release" ]; then
		short="SuSE"
		long="$(head -n 1 "$dir/etc/SuSE-release")"
	elif [ -e "$dir/etc/gentoo-release" ]; then
		short="Gentoo"
		long="$(cat "$dir/etc/gentoo-release")"
	elif [ -e "$dir/etc/cobalt-release" ]; then
		short="Cobalt"
		long="$(cat "$dir/etc/cobalt-release")"
	elif [ -e "$dir/etc/yellowdog-release" ]; then
		short="YellowDog"
		long="$(cat "$dir/etc/yellowdog-release")"
	elif [ -e "$dir/etc/turbolinux-release" ]; then
		short="Turbolinux"
		long="$(cat "$dir/etc/turbolinux-release")"
	elif [ -e "$dir/etc/pardus-release" ]; then
		short="Pardus"
		long="$(cat "$dir/etc/pardus-release")"
	elif [ -e "$dir/etc/kanotix-version" ]; then
		short="Kanotix"
		long="$(cat "$dir/etc/kanotix-version")"
	elif [ -e "$dir/etc/slackware-version" ]; then
		short="Slackware"
		long="$(printf "Slackware Linux (%s)\n" "$(cat "$dir/etc/slackware-version")")"
	elif [ -e "$dir/sbin/pkgtool" ]; then
		short="Slackware"
		long="Slackware Linux"
	elif grep -qs OpenLinux "$dir/etc/issue"; then
		short="Caldera"
		long="Caldera OpenLinux"
	elif [ -e "$dir/etc/frugalware-release" ]; then
		short="Frugalware Linux"
		long="$(cat "$dir/etc/frugalware-release")"
	elif [ -e "$dir/etc/kdemar-release" ]; then
		short="K-DEMar"
		long="$(printf "K-DEMar GNU/Linux (%s)\n" "$(cat "$dir/etc/kdemar-release")")"
	elif [ -e "$dir/etc/lfs-release" ]; then
		short="LFS"
		long="$(printf "Linux From Scratch (%s)\n" "$(cat "$dir/etc/lfs-release")")"
	elif [ -e "$dir/etc/meego-release" ]; then
		short="MeeGo"
		long="$(head -1 "$dir/etc/meego-release")"
	elif [ -e "$dir/etc/4MLinux-version" ]; then
		short="4MLinux"
		long="4MLinux $(head -1 "$dir/etc/4MLinux-version")"
	elif [ -e "$dir/etc/devuan_version" ]; then
		short="Devuan"
		long="$(printf "Devuan GNU/Linux (%s)\n" "$(cat "$dir/etc/devuan_version")")"
	else
		exit 1
#		short="Linux"
#		long="unknown Linux distribution"
	fi
	
        label="$(count_next_label "$short")"
	if [ "x$type" = "xbtrfs" -a "x$uuid" != "x" -a "x$subvol" != "x" ]; then
		result "$partition:$long:$label:linux:$type:$uuid:$subvol"
	else
		result "$partition:$long:$label:linux"
	fi
	exit 0
#else
#	exit 1
#fi

cmd: