gentoo resync : 27.03.2021

4 files changed, 578 insertions, 2 deletions

diff --git a/sys-boot/os-prober/Manifest b/sys-boot/os-prober/Manifest
index e0aee23f8c39..356c7c385e39 100644
--- a/sys-boot/os-prober/Manifest
+++ b/sys-boot/os-prober/Manifest
@@ -1,4 +1,7 @@
 AUX os-prober-1.76-exherbo.patch 905 BLAKE2B e8d78b730d33b5760128eaf910f20ac01dc7db3e2b3a271279859869e3c8451e7c8dd72ed5b2784a0dfbf3f31747a81509445d3793a8ed8070a1a721b1b84186 SHA512 0c3c2e4cde868e186131b08268e6344841f0830be5bf4131e5a7ded93a222097599b0a011168e4b7bd0bc97b69ece194df1d46d98eac2c921f16b3e76d004cc8
+AUX os-prober-1.78-btrfsfix.patch 14379 BLAKE2B 5aff7aad1957966355748eafb7b1b426e81428c1de9d1053e708cccb271efe97c8728887a7dbc969a78e4ff3d92cbb0b1badf7551532030b585c5211a7308323 SHA512 deefcd22ac50b9a5cdc4609eda6cc5c58f40989c17e56a8f098f529bacfef7bb65fca9775e7ea85540b850eecfd1380d9474388644f13c47459c14bc6cbe681f
 DIST os-prober_1.77.tar.xz 26660 BLAKE2B cff8d96927cf251e9d8ee95561289e9c49a89fbcf9045e7c7169f73b1eeb151797db7b075ebc14dbbdd96996d007b07001e2843cf835defd675f63595614297b SHA512 4d9c22ccc4d950644a06a17ec4424aca5ff82aeb20052dc389dd451b6b9a1799c5a9438644a29093153730af42066abbbbb78f593f2564314c9adbd43f60e39b
+DIST os-prober_1.78.tar.xz 26848 BLAKE2B eee68ab9be36807d86e8bda831cfd490a01d20d9cc3f84ca50d5e1143e5a2dd66e47d3bdf2b4780cf73cc692f0ffc9497c6cbf13ce7aa0057e996b13d706c8f7 SHA512 7a0425130d17ce8554e7d0797b53e3a984f63a2fdcf8e668c83d357418d8c68259ada25bc350b199adece2e683d9014f234e3a83ce5ab7485be2e69c45874640
 EBUILD os-prober-1.77.ebuild 1851 BLAKE2B 1570c05454c7c27e271944a94b9d6488e5c8a37231b8559b87a46551e1445d8dc25f93c87d3345b72f36da1f80e8a16914b737fb25f2ea742c758776129da5cf SHA512 9b58de5bc06dd75de053d0a103af0cd701d2b7b3e639c9d8c9b77d90d3070506cfc83fd75ea32a123c918ca58366e1a26a1b71ec2308f38d0b4af32e98b8a3c5
-MISC metadata.xml 166 BLAKE2B c254f1fb642881aba57637be14fb0a89b10384f91a128feaec3a8c870d76efc2cbacb92caccc0dee2dd19a5ac5eaf8643080dafa05c4e2ac96a68568927e5afd SHA512 a56648c974a1d14dd4c18237532773c72057a13ab90c58b5da04f185e3c12a8bd8d5c21fb06053507f31766291a82dc7d87b34cd65fd94cfe2af7295c813ef84
+EBUILD os-prober-1.78.ebuild 2175 BLAKE2B 3eb71711e0ce7c8b9adf655446bfcace4fc598f113bf4604e239b021ad6aa03bb869be7b8111d6ba902b060a3763640b2287fea1b9cfc8c821e68d71d45fb2fb SHA512 f26f02f1c46ad0d41e24fe241bb0c057ef3481047ed4b91262c91a8ca65e518a5359845cccaf94db49fdff67ce36bc22e2fdaa2e53a57bfdc65b6742ae280f09
+MISC metadata.xml 383 BLAKE2B db5402f4cacef3df1728248b8fa2bf1d817d56ea41b8049e021382502dee75e1669ad691c4c7761b53127e9d3779683e9304139e28727e2ac7f36db587eb5ea0 SHA512 52ab18611ec550ab9f95f2e9e1e406dfece82615db0f1f66d862ea19603b11e0c2a358fcf430300db972be34177e787d0867a7f9530aaf598e488e13ba517f7e
diff --git a/sys-boot/os-prober/files/os-prober-1.78-btrfsfix.patch b/sys-boot/os-prober/files/os-prober-1.78-btrfsfix.patch
new file mode 100644
index 000000000000..5a74285dc73f
--- /dev/null
+++ b/sys-boot/os-prober/files/os-prober-1.78-btrfsfix.patch
@@ -0,0 +1,474 @@
+Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=688336
+
+diff --git a/common.sh b/common.sh
+index c2c5f46..8fb3c5f 100644
+--- a/common.sh
++++ b/common.sh
+@@ -155,6 +155,7 @@ parse_proc_mounts () {
+ 	done
+ }
+ 
++# add forth parameter to pickup btrfs subvol info
+ parsefstab () {
+ 	while read -r line; do
+ 		case "$line" in
+@@ -165,12 +166,22 @@ parsefstab () {
+ 				set -f
+ 				set -- $line
+ 				set +f
+-				printf '%s %s %s\n' "$1" "$2" "$3"
++				printf '%s %s %s %s\n' "$1" "$2" "$3" "$4"
+ 			;;
+ 		esac
+ 	done
+ }
+ 
++#check_btrfs_mounted $bootsv $bootuuid)
++check_btrfs_mounted () {
++	bootsv="$1"
++	bootuuid="$2"
++	bootdev=$(blkid | grep "$bootuuid" | cut -d ':' -f  1)
++	bindfrom=$(grep " btrfs " /proc/self/mountinfo |
++		   grep " $bootdev " | grep " /$bootsv " | cut -d ' ' -f 5)
++	printf "%s" "$bindfrom"
++}
++
+ unescape_mount () {
+ 	printf %s "$1" | \
+ 		sed 's/\\011/	/g; s/\\012/\n/g; s/\\040/ /g; s/\\134/\\/g'
+diff --git a/linux-boot-prober b/linux-boot-prober
+index e32dc84..2a60fa2 100755
+--- a/linux-boot-prober
++++ b/linux-boot-prober
+@@ -5,16 +5,143 @@ set -e
+ 
+ newns "$@"
+ require_tmpdir
++ERR="n"
++
++tmpmnt=/var/lib/os-prober/mount
++if [ ! -d "$tmpmnt" ]; then
++	mkdir "$tmpmnt"
++fi
++
++mounted=
++bootmnt=
++bootsv=
++bootuuid=
+ 
+ grep "^/dev/" /proc/mounts | parse_proc_mounts >"$OS_PROBER_TMP/mounted-map" || true
+ 
+-partition="$1"
++if [ -z "$1" ]; then
++	ERR=y
++elif [ "$1" = btrfs -a -z "$2" ]; then
++	ERR=y
++elif [ "$1" = btrfs -a -z "$3" ]; then
++	ERR=y
++elif [ "$1" = btrfs ]; then
++	type=btrfs
++	echo "$2" | grep -q "^UUID=" || ERR=y
++	echo "$3" | grep -q "^subvol=" || ERR=y
++	export "$2"
++	export "$3"
++	partition=$(blkid | grep "$UUID" | cut -d ':' -f 1 | tr '\n' ' ' | cut -d ' ' -f 1)
++	debug "btrfs: partition=$partition, UUID=$UUID, subvol=$subvol"
++else
++	partition="$1"
++	type=other
++fi
+ 
+-if [ -z "$partition" ]; then
++if [ "x$ERR" != xn ]; then
+ 	echo "usage: linux-boot-prober partition" >&2
++	echo "       linux-boot-prober btrfs UUID=<> subvol=<>" >&2
+ 	exit 1
+ fi
+ 
++if [ "$type" = btrfs ]; then
++	# handle all of the btrfs stuff here
++	if [ ! -e "/proc/self/mountinfo" ]; then
++		warn "/proc/self/mountinfo does not exist, exiting"
++		umount "$tmpmnt" 2>/dev/null
++		rmdir "$tmpmnt" 2>/dev/null
++		exit 1
++	fi
++	mpoint=$(grep "btrfs" /proc/self/mountinfo | grep " /$subvol " | grep " $partition " | cut -d ' ' -f 5)
++	if [ "$mpoint" = "/" ]; then
++		warn "specifying active root not valid, exiting"
++		umount "$tmpmnt" 2>/dev/null
++		rmdir "$tmpmnt" 2>/dev/null
++		exit 1
++	fi
++	if [ "$mpoint" = "$tmpmnt" ]; then
++		warn "btrfs subvol=$subvool, UUID=$UUID, already mounted on $tmpmnt **ERROR**"
++		umount "$tmpmnt" 2>/dev/null
++		rmdir "$tmpmnt" 2>/dev/null
++		exit 1
++	fi
++	if [ -z "$mpoint" ]; then
++		# mount the btrfs root
++		if ! mount -o subvol=$subvol -t btrfs -U $UUID "$tmpmnt" 2>/dev/null; then
++			warn "error mounting btrfs subvol=$subvol UUID=$UUID"
++			umount "$tmpmnt/boot" 2>/dev/null
++			umount "$tmpmnt" 2>/dev/null
++			rmdir "$tmpmnt" 2>/dev/null
++			exit 1
++		fi
++	else
++		# bind-mount
++		if ! mount -o bind "$mpoint" "$tmpmnt" 2>/dev/null; then
++			warn "error mounting btrfs bindfrom=$mpoint subvol=$subvol UUID=$UUID"
++			umount "$tmpmnt/boot" 2>/dev/null
++			umount "$tmpmnt" 2>/dev/null
++			rmdir "$tmpmnt" 2>/dev/null
++			exit 1
++		fi
++	fi
++	debug "mounted btrfs $partition, subvol=$subvol on $tmpmnt"
++	if [ ! -e "$tmpmnt/etc/fstab" ]; then
++		warn "btrfs subvol=$subvol not root"
++		umount "$tmpmnt" 2>/dev/null
++		rmdir "$tmpmnt" 2>/dev/null
++		exit 1
++	fi
++	bootmnt=$(parsefstab < "$tmpmnt/etc/fstab" | grep " /boot ") || true
++	if [ -z "$bootmnt" ]; then
++		# /boot is part of the root
++		bootpart="$partition"
++		bootsv="$subvol"
++	elif echo "$bootmnt" | cut -d ' ' -f 3 | grep -q "btrfs"; then
++		# separate btrfs /boot subvolume
++		bootsv=$(echo "$bootmnt" | cut -d ' ' -f 4 | grep "^subvol=" | sed "s/subvol=//" )
++		bootuuid=$(echo "$bootmnt" | cut -d ' ' -f 1 | grep "^UUID=" | sed "s/UUID=//" )
++		debug "mounting btrfs $tmpmnt/boot UUID=$bootuuid subvol=$bootsv"
++		bindfrom=$(check_btrfs_mounted $bootsv $bootuuid)
++		if [ -n "$bindfrom" ]; then
++			# already mounted some place
++			if ! mount -o bind $bindfrom "$tmpmnt/boot" 2>/dev/null; then
++				warn "error bind mounting btrfs boot subvol=$bootsv, from=$bindfrom"
++				umount "$tmpmnt/boot" 2>/dev/null
++				umount "$tmpmnt" 2>/dev/null
++				rmdir "$tmpmnt" 2>/dev/null
++				exit 1
++			fi
++		elif ! mount -o subvol=$bootsv -t btrfs -U $bootuuid "$tmpmnt/boot" 2>/dev/null; then
++			warn "error mounting btrfs boot partition subvol=$bootsv, UUID=$bootuuid"
++			umount "$tmpmnt/boot" 2>/dev/null
++			umount "$tmpmnt" 2>/dev/null
++			rmdir "$tmpmnt" 2>/dev/null
++			exit 1
++		fi
++		bootpart=$(grep " btrfs " /proc/self/mountinfo | grep " /$bootsv " | cut -d ' ' -f 10)
++	else
++		# non-btrfs partition or logical volume
++		linux_mount_boot $partition $tmpmnt
++		bootpart="${mountboot%% *}"
++		bootsv=
++	fi
++
++	test="/usr/lib/linux-boot-probes/mounted/40grub2"
++	if [ -f $test ] && [ -x $test ]; then
++		debug "running $test $partition $bootpart $tmpmnt $type $subvol $bootsv"
++		if $test "$partition" "$bootpart" "$tmpmnt" "$type" "$subvol" "$bootsv"; then
++			debug "$test succeeded"
++		fi
++	fi
++	umount "$tmpmnt/boot" 2>/dev/null || true
++	if ! umount "$tmpmnt" 2>/dev/null; then
++		warn "problem umount $tmpmnt"
++	fi
++	rmdir "$tmpmnt" 2>/dev/null || true
++
++	exit 0
++fi
++
+ if ! mapped="$(mapdevfs "$partition")"; then
+ 	log "Device '$partition' does not exist; skipping"
+ 	continue
+@@ -22,8 +149,8 @@ fi
+ 
+ if ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map"; then
+ 	for test in /usr/lib/linux-boot-probes/*; do
+-		debug "running $test"
+ 		if [ -x $test ] && [ -f $test ]; then
++			debug "running $test"
+ 			if $test "$partition"; then
+ 				debug "linux detected by $test"
+ 				break
+diff --git a/linux-boot-probes/mounted/common/40grub2 b/linux-boot-probes/mounted/common/40grub2
+index 885614e..db5cbfd 100755
+--- a/linux-boot-probes/mounted/common/40grub2
++++ b/linux-boot-probes/mounted/common/40grub2
+@@ -2,17 +2,30 @@
+ . /usr/share/os-prober/common.sh
+ set -e
+ 
++# add support for btrfs with no separate /boot
++# that is, rootsv = bootsv
+ partition="$1"
+ bootpart="$2"
+ mpoint="$3"
+ type="$4"
++rootsv="$5"
++bootsv="$6"
+ 
+ found_item=0
+ 
+ entry_result () {
++	if [ "x$type" = "xbtrfs" -a "$partition" = "$bootpart" ]; then
++		# trim off the leading subvol
++		kernelfile=$(echo "$kernel" | cut -d '/' -f 2- | cut -d '/' -f 2-)
++		if [ "x$rootsv" != "x$bootsv" ]; then
++		   kernelfile="/boot/$kernelfile"
++		fi
++	else
++		kernelfile=$kernel
++	fi
+ 	if [ "$ignore_item" = 0 ] && \
+ 	   [ -n "$kernel" ] && \
+-	   [ -e "$mpoint/$kernel" ]; then
++	   [ -e "$mpoint/$kernelfile" ]; then
+ 		result "$rootpart:$bootpart:$title:$kernel:$initrd:$parameters"
+ 		found_item=1
+ 	fi
+diff --git a/os-prober b/os-prober
+index 8852887..482c3c2 100755
+--- a/os-prober
++++ b/os-prober
+@@ -76,9 +76,12 @@ partitions () {
+ 
+ 	# Also detect OSes on LVM volumes (assumes LVM is active)
+ 	if type lvs >/dev/null 2>&1; then
+-		echo "$(LVM_SUPPRESS_FD_WARNINGS=1 log_output lvs --noheadings --separator : -o vg_name,lv_name |
++		echo "$(LVM_SUPPRESS_FD_WARNINGS=1 log_output lvs --noheadings --separator : -o vg_name,lv_name 2>/dev/null |
+ 			sed "s|-|--|g;s|^[[:space:]]*\(.*\):\(.*\)$|/dev/mapper/\1-\2|")"
+ 	fi
++
++	# now lets make sure we got all of the btrfs partitions and disks
++	blkid | grep 'TYPE="btrfs"' | cut -d ':' -f 1
+ }
+ 
+ parse_proc_swaps () {
+@@ -136,6 +139,8 @@ if [ -f /proc/mdstat ] ; then
+ 	grep "^md" /proc/mdstat | cut -d: -f2- | parse_proc_mdstat >"$OS_PROBER_TMP/raided-map" || true
+ fi
+ 
++: >"$OS_PROBER_TMP/btrfs-vols"
++
+ for partition in $(partitions); do
+ 	if ! mapped="$(mapdevfs "$partition")"; then
+ 		log "Device '$partition' does not exist; skipping"
+@@ -154,7 +159,26 @@ for partition in $(partitions); do
+ 		continue
+ 	fi
+ 
+-	if ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map" ; then
++	# do btrfs processing here; both mounted and unmounted will
++	# be handled by 50mounted-tests so we can do a subvol only once.
++	type=$(blkid -o value -s TYPE $mapped || true)
++	if [ "$type" = btrfs ]; then
++		uuid=$(blkid -o value -s UUID $mapped)
++		if grep -q "^$uuid" "$OS_PROBER_TMP/btrfs-vols" ; then
++			continue
++		fi
++		debug "btrfs volume uuid=$uuid partition=$partition"
++		echo "$uuid" >>"$OS_PROBER_TMP/btrfs-vols"
++		test="/usr/lib/os-probes/50mounted-tests"
++		if [ -f "$test" ] && [ -x "$test" ]; then
++			debug "running $test on btrfs $partition"
++			if "$test" btrfs "$uuid" "$partition"; then
++				debug "os detected by $test"
++				continue
++			fi
++		fi
++
++	elif ! grep -q "^$mapped " "$OS_PROBER_TMP/mounted-map" ; then
+ 		for test in /usr/lib/os-probes/*; do
+ 			if [ -f "$test" ] && [ -x "$test" ]; then
+ 				debug "running $test on $partition"
+diff --git a/os-probes/common/50mounted-tests b/os-probes/common/50mounted-tests
+index 2951ef9..e33eb82 100755
+--- a/os-probes/common/50mounted-tests
++++ b/os-probes/common/50mounted-tests
+@@ -19,19 +19,31 @@ do_unmount() {
+ 	rmdir "$tmpmnt" || true
+ }
+ 
+-types="$(fs_type "$partition")"
++if [ "x$1" = xbtrfs ]; then
++	types=btrfs
++	if [ -z "$2" -o -z "$3" ]; then
++		debug "missing btrfs parameters, exiting"
++		exit 1
++	fi
++	UUID="$2"
++	BTRFSDEV="$3"
++else
++	partition="$1"
++	types="$(fs_type "$partition")" || types=NOT-DETECTED
++fi
++
+ if [ "$types" = NOT-DETECTED ]; then
+ 	debug "$1 type not recognised; skipping"
+-	exit 0
++	exit 1
+ elif [ "$types" = swap ]; then
+ 	debug "$1 is a swap partition; skipping"
+-	exit 0
++	exit 1
+ elif [ "$types" = crypto_LUKS ]; then
+ 	debug "$1 is a LUKS partition; skipping"
+-	exit 0
++	exit 1
+ elif [ "$types" = LVM2_member ]; then
+ 	debug "$1 is an LVM member; skipping"
+-	exit 0
++	exit 1
+ elif [ "$types" = ntfs ]; then
+ 	if type ntfs-3g >/dev/null 2>&1; then
+ 		types='ntfs-3g ntfs'
+@@ -40,7 +52,7 @@ elif [ -z "$types" ]; then
+ 	if type cryptsetup >/dev/null 2>&1 && \
+ 	   cryptsetup luksDump "$partition" >/dev/null 2>&1; then
+ 		debug "$1 is a LUKS partition; skipping"
+-		exit 0
++		exit 1
+ 	fi
+ 	for type in $(grep -v nodev /proc/filesystems); do
+ 		# hfsplus filesystems are mountable as hfs. Try hfs last so
+@@ -63,6 +75,108 @@ if [ ! -d "$tmpmnt" ]; then
+ fi
+ 
+ mounted=
++
++# all btrfs processing here.  Handle both unmounted and
++# mounted subvolumes.
++if [ "$types" = btrfs ]; then
++	partition="$BTRFSDEV"
++	debug "begin btrfs processing for $UUID"
++	# note that the btrfs volume must not be mounted ro
++	if mount -t btrfs -U "$UUID" "$tmpmnt"  2>/dev/null; then
++		debug "btrfs volume $UUID mounted"
++	else
++		warn "cannot mount btrfs volume $UUID, exiting"
++		rmdir "$tmpmnt" || true
++		exit 1
++	fi
++	# besides regular subvols, get ro and snapshot so thet can be excluded
++        subvols=$(btrfs subvolume list "$tmpmnt" | cut -d ' ' -f 9)
++        rosubvols=$(btrfs subvolume list -r "$tmpmnt" | cut -d ' ' -f 9)
++        sssubvols=$(btrfs subvolume list -s "$tmpmnt" | cut -d ' ' -f 14)
++        if ! umount "$tmpmnt"; then
++            warn "failed to umount btrfs volume on $tmpmnt"
++            rmdir "$tmpmnt" || true
++            exit 1
++        fi
++
++	found=
++	mounted=
++
++	mpoint="$(grep btrfs /proc/self/mountinfo | grep "$partition " | cut -d ' ' -f 5)"
++	if [ -n "$mpoint" -a "x$mpoint" = "x/" ]; then
++		debug "This is the root for the running system" #running system must be done elsewhere
++	else
++	    #partition was not root of running system, so lets look for bootable subvols
++	    if [ -n "$mpoint" ] ; then
++		mounted=1  #partition was already mounted,so lets not unmount it when done
++	    else
++		# again, do not mount btrfs ro
++		mount -t btrfs -U "$UUID" "$tmpmnt"
++		mpoint="$tmpmnt"
++	    fi
++
++	    test="/usr/libexec/os-probes/mounted/90linux-distro"
++	    if [ -f "$test" ] && [ -x "$test" ]; then
++		debug "running subtest $test"
++		if "$test" "$partition" "$mpoint" btrfs "UUID=$UUID"; then
++		    debug "os found by subtest $test on $partition"
++		    found=1
++		fi
++	    fi
++	    if [ -z "$mounted" ]; then
++		if ! umount "$tmpmnt"; then
++		    warn "failed to umount $tmpmnt"
++		fi
++	    fi
++	fi
++
++	if [ -z "$subvols" ]; then
++	        debug "no subvols found on btrfs volume $UUID"
++	else
++		found=
++                for subvol in $subvols; do
++			debug "begin btrfs processing for $UUID subvol=$subvol"
++			if echo "$rosubvols" | grep -q -x "$subvol"; then
++				continue
++			fi
++			if echo "$sssubvols" | grep -q -x "$subvol"; then
++				continue
++			fi
++			mounted=
++			mpoint="$(grep btrfs /proc/self/mountinfo | grep "$partition " | grep "/$subvol " | cut -d ' ' -f 5)"
++			if [ -n "$mpoint" ]; then
++				if [ "x$mpoint" = "x/" ]; then
++					continue # this is the root for the running system
++				fi
++				mounted=1
++			else
++				# again, do not mount btrfs ro
++				mount -t btrfs -o subvol="$subvol" -U "$UUID" "$tmpmnt"
++				mpoint="$tmpmnt"
++			fi
++			test="/usr/lib/os-probes/mounted/90linux-distro"
++			if [ -f "$test" ] && [ -x "$test" ]; then
++				debug "running subtest $test"
++				if "$test" "$partition" "$mpoint" btrfs "UUID=$UUID" "subvol=$subvol"; then
++					debug "os found by subtest $test on subvol $subvol"
++					found=1
++				fi
++			fi
++			if [ -z "$mounted" ]; then
++				if ! umount "$tmpmnt"; then
++				    warn "failed to umount $tmpmnt"
++				fi
++			fi
++		done
++	fi
++	rmdir "$tmpmnt" || true
++	if [ "$found" ]; then
++		exit 0
++	else
++		exit 1
++	fi
++fi
++
+ if type grub-mount >/dev/null 2>&1 && \
+    type grub-probe >/dev/null 2>&1 && \
+    grub-mount "$partition" "$tmpmnt" 2>/dev/null; then
+diff --git a/os-probes/mounted/common/90linux-distro b/os-probes/mounted/common/90linux-distro
+index badfbb1..9bc5154 100755
+--- a/os-probes/mounted/common/90linux-distro
++++ b/os-probes/mounted/common/90linux-distro
+@@ -7,6 +7,8 @@ set -e
+ partition="$1"
+ dir="$2"
+ type="$3"
++uuid="$4"
++subvol="$5"
+ 
+ # This test is inaccurate, but given separate / and /boot partitions and the
+ # fact that only some architectures have ld-linux.so, I can't see anything
+@@ -143,7 +145,11 @@ if (ls "$dir"/lib*/ld*.so* && [ -d "$dir/boot" ] || ls "$dir"/usr/lib*/ld*.so*)
+ 	fi
+ 	
+         label="$(count_next_label "$short")"
+-	result "$partition:$long:$label:linux"
++	if [ "x$type" = "xbtrfs" -a "x$uuid" != "x" -a "x$subvol" != "x" ]; then
++		result "$partition:$long:$label:linux:$type:$uuid:$subvol"
++	else
++		result "$partition:$long:$label:linux"
++	fi
+ 	exit 0
+ else
+ 	exit 1
diff --git a/sys-boot/os-prober/metadata.xml b/sys-boot/os-prober/metadata.xml
index 6f49eba8f496..e76d1b851a04 100644
--- a/sys-boot/os-prober/metadata.xml
+++ b/sys-boot/os-prober/metadata.xml
@@ -1,5 +1,12 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE pkgmetadata SYSTEM "http://www.gentoo.org/dtd/metadata.dtd">
 <pkgmetadata>
-<!-- maintainer-needed -->
+	<maintainer type="person" proxied="yes">
+		<email>plevine457@gmail.com</email>
+		<name>Peter Levine</name>
+	</maintainer>
+	<maintainer type="person" proxied="proxy">
+		<email>bkohler@gentoo.org</email>
+		<name>Ben Kohler</name>
+	</maintainer>
 </pkgmetadata>
diff --git a/sys-boot/os-prober/os-prober-1.78.ebuild b/sys-boot/os-prober/os-prober-1.78.ebuild
new file mode 100644
index 000000000000..6b81b75a08cc
--- /dev/null
+++ b/sys-boot/os-prober/os-prober-1.78.ebuild
@@ -0,0 +1,92 @@
+# Copyright 1999-2021 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+inherit readme.gentoo-r1 toolchain-funcs
+
+DESCRIPTION="Utility to detect other OSs on a set of drives"
+HOMEPAGE="https://packages.debian.org/source/sid/os-prober"
+SRC_URI="mirror://debian/pool/main/${PN::1}/${PN}/${PN}_${PV}.tar.xz"
+
+LICENSE="GPL-3"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+# grub-mount needed per bug #607518
+RDEPEND="sys-boot/grub:2[mount]"
+
+# bug 594250
+QA_MULTILIB_PATHS="usr/lib/os-prober/.*"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.76-exherbo.patch
+	"${FILESDIR}"/${PN}-1.78-btrfsfix.patch
+)
+
+DOC_CONTENTS="
+	If you intend for os-prober to detect versions of Windows installed on
+	NTFS-formatted partitions, your system must be capable of reading the
+	NTFS filesystem. One way to do this is by installing sys-fs/ntfs3g.
+	Also, in a chroot environment, it is necessary to bind mount /run/udev
+	(see https://wiki.gentoo.org/wiki/GRUB2#os-prober_and_UEFI_in_chroot).
+
+	NOTE: Since sys-boot/grub-2.06-rc1, grub-mkconfig disables os-prober by default.
+	To enable it, add GRUB_DISABLE_OS_PROBER=false to /etc/default/grub.
+"
+
+src_prepare() {
+	default
+	# use default GNU rules
+	rm Makefile || die 'rm Makefile failed'
+}
+
+src_compile() {
+	tc-export CC
+	emake newns
+}
+
+src_install() {
+	dobin os-prober linux-boot-prober
+
+	# Note: as no shared libraries are installed, /usr/lib is correct
+	exeinto /usr/lib/os-prober
+	doexe newns
+
+	insinto /usr/share/os-prober
+	doins common.sh
+
+	keepdir /var/lib/os-prober
+
+	local debarch=${ARCH%-*} dir
+
+	case ${debarch} in
+		amd64)		debarch=x86 ;;
+		ppc|ppc64)	debarch=powerpc ;;
+	esac
+
+	for dir in os-probes{,/mounted,/init} linux-boot-probes{,/mounted}; do
+		exeinto /usr/lib/${dir}
+		doexe ${dir}/common/*
+		if [[ -d ${dir}/${debarch} ]]; then
+			doexe ${dir}/${debarch}/*
+		fi
+		if [[ -d ${dir}/${debarch}/efi ]]; then
+			exeinto /usr/lib/${dir}/efi
+			doexe ${dir}/${debarch}/efi/*
+		fi
+	done
+
+	if use amd64 || use x86; then
+		exeinto /usr/lib/os-probes/mounted
+		doexe os-probes/mounted/powerpc/20macosx
+	fi
+
+	einstalldocs
+	dodoc debian/changelog
+
+	readme.gentoo_create_doc
+}
+
+pkg_postinst() {
+	readme.gentoo_print_elog
+}