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* [gentoo-dev] [PATCH] mount-boot.eclass: Check if /boot is sane, but don't try to mount it.
@ 2019-12-06 13:11 Ulrich Müller
  2019-12-06 14:03 ` Michał Górny
  0 siblings, 1 reply; 4+ messages in thread
From: Ulrich Müller @ 2019-12-06 13:11 UTC (permalink / raw
  To: gentoo-dev

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The eclass failed to remount a read-only mounted /boot, because package
collision sanity checks in recent Portage versions prevented it from
reaching pkg_pretend() at all. Furthermore, with the "mount-sandbox"
feature enabled, the mount won't be propagated past pkg_preinst() and
installed files would end up under the (shadowed) mount point.

Therefore don't even attempt to mount /boot ourselves, but error out
if it isn't mounted read/write and ask the user to mount /boot.

Also clean up and simplify. (For example, awk is a grown-up program
which doesn't need any help from egrep or sed. :-)

Closes: https://bugs.gentoo.org/532264
Signed-off-by: Ulrich Müller <ulm@gentoo.org>
---
 eclass/mount-boot.eclass | 137 ++++++++++++---------------------------
 1 file changed, 43 insertions(+), 94 deletions(-)

diff --git a/eclass/mount-boot.eclass b/eclass/mount-boot.eclass
index 938df6732f4..1d7eb8bfc29 100644
--- a/eclass/mount-boot.eclass
+++ b/eclass/mount-boot.eclass
@@ -1,156 +1,105 @@
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 # @ECLASS: mount-boot.eclass
 # @MAINTAINER:
 # base-system@gentoo.org
 # @BLURB: functions for packages that install files into /boot
 # @DESCRIPTION:
 # This eclass is really only useful for bootloaders.
 #
 # If the live system has a separate /boot partition configured, then this
 # function tries to ensure that it's mounted in rw mode, exiting with an
-# error if it can't. It does nothing if /boot isn't a separate partition.
+# error if it can't.  It does nothing if /boot isn't a separate partition.
+
+case ${EAPI:-0} in
+	4|5|6|7) ;;
+	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
+esac
 
 EXPORT_FUNCTIONS pkg_pretend pkg_preinst pkg_postinst pkg_prerm pkg_postrm
 
 # @FUNCTION: mount-boot_disabled
 # @INTERNAL
 # @DESCRIPTION:
 # Detect whether the current environment/build settings are such that we do not
 # want to mess with any mounts.
 mount-boot_is_disabled() {
 	# Since this eclass only deals with /boot, skip things when ROOT is active.
-	if [[ "${ROOT:-/}" != "/" ]] ; then
+	if [[ ${ROOT:-/} != "/" ]] ; then
 		return 0
 	fi
 
 	# If we're only building a package, then there's no need to check things.
-	if [[ "${MERGE_TYPE}" == "buildonly" ]] ; then
+	if [[ ${MERGE_TYPE} == "buildonly" ]] ; then
 		return 0
 	fi
 
 	# The user wants us to leave things be.
-	if [[ -n ${DONT_MOUNT_BOOT} ]] ; then
+	if [[ -n ${I_KNOW_WHAT_I_AM_DOING} ]] ; then
 		return 0
 	fi
 
 	# OK, we want to handle things ourselves.
 	return 1
 }
 
 # @FUNCTION: mount-boot_check_status
 # @INTERNAL
 # @DESCRIPTION:
-# Figure out what kind of work we need to do in order to have /boot be sane.
-# Return values are:
-# 0 - Do nothing at all!
-# 1 - It's mounted, but is currently ro, so need to remount rw.
-# 2 - It's not mounted, so need to mount it rw.
+# Check if /boot is sane, i.e., mounted read/write if on a separate
+# partition.  Return 0 if conditions are fulfilled, otherwise die.
 mount-boot_check_status() {
 	# Get out fast if possible.
 	mount-boot_is_disabled && return 0
 
 	# note that /dev/BOOT is in the Gentoo default /etc/fstab file
-	local fstabstate=$(awk '!/^#|^[[:blank:]]+#|^\/dev\/BOOT/ {print $2}' /etc/fstab | egrep "^/boot$" )
-	local procstate=$(awk '$2 ~ /^\/boot$/ {print $2}' /proc/mounts)
-	local proc_ro=$(awk '{ print $2 " ," $4 "," }' /proc/mounts | sed -n '/^\/boot .*,ro,/p')
-
-	if [ -n "${fstabstate}" ] && [ -n "${procstate}" ] ; then
-		if [ -n "${proc_ro}" ] ; then
-			echo
-			einfo "Your boot partition, detected as being mounted at /boot, is read-only."
-			einfo "It will be remounted in read-write mode temporarily."
-			return 1
-		else
-			echo
-			einfo "Your boot partition was detected as being mounted at /boot."
-			einfo "Files will be installed there for ${PN} to function correctly."
-			return 0
-		fi
-	elif [ -n "${fstabstate}" ] && [ -z "${procstate}" ] ; then
-		echo
-		einfo "Your boot partition was not mounted at /boot, so it will be automounted for you."
-		einfo "Files will be installed there for ${PN} to function correctly."
-		return 2
-	else
-		echo
+	local fstabstate=$(awk '!/^[[:blank:]]*#|^\/dev\/BOOT/ && $2 == "/boot" \
+		{print $2}' /etc/fstab)
+
+	if [[ -z ${fstabstate} ]] ; then
 		einfo "Assuming you do not have a separate /boot partition."
 		return 0
 	fi
-}
 
-mount-boot_pkg_pretend() {
-	# Get out fast if possible.
-	mount-boot_is_disabled && return 0
+	local procstate=$(awk '$2 == "/boot" \
+		{print gensub(/^(.*,)?(ro|rw)(,.*)?$/, "\\2", 1, $4)}' /proc/mounts)
 
-	elog "To avoid automounting and auto(un)installing with /boot,"
-	elog "just export the DONT_MOUNT_BOOT variable."
-	mount-boot_check_status
+	if [[ -z ${procstate} ]] ; then
+		eerror "Your boot partition is not mounted at /boot."
+		eerror "Please mount it and retry."
+		die	"/boot not mounted"
+	fi
+
+	if [[ ${procstate} == "ro" ]] ; then
+		eerror "Your boot partition, detected as being mounted at /boot," \
+			"is read-only."
+		eerror "Please remount it read/write and retry."
+		die	"/boot mounted read-only"
+	fi
+
+	einfo "Your boot partition was detected as being mounted at /boot."
+	einfo "Files will be installed there for ${PN} to function correctly."
+	return 0
 }
 
-mount-boot_mount_boot_partition() {
+mount-boot_pkg_pretend() {
 	mount-boot_check_status
-	case $? in
-	0)	# Nothing to do.
-		;;
-	1)	# Remount it rw.
-		mount -o remount,rw /boot
-		if [ $? -ne 0 ] ; then
-			echo
-			eerror "Unable to remount in rw mode. Please do it manually!"
-			die "Can't remount in rw mode. Please do it manually!"
-		fi
-		touch /boot/.e.remount
-		;;
-	2)	# Mount it rw.
-		mount /boot -o rw
-		if [ $? -ne 0 ] ; then
-			echo
-			eerror "Cannot automatically mount your /boot partition."
-			eerror "Your boot partition has to be mounted rw before the installation"
-			eerror "can continue. ${PN} needs to install important files there."
-			die "Please mount your /boot partition manually!"
-		fi
-		touch /boot/.e.mount
-		;;
-	esac
 }
 
 mount-boot_pkg_preinst() {
-	# Handle older EAPIs.
-	case ${EAPI:-0} in
-	[0-3]) mount-boot_pkg_pretend ;;
-	esac
-
-	mount-boot_mount_boot_partition
+	mount-boot_check_status
 }
 
 mount-boot_pkg_prerm() {
-	touch "${ROOT}"/boot/.keep 2>/dev/null
-	mount-boot_mount_boot_partition
-	touch "${ROOT}"/boot/.keep 2>/dev/null
-}
-
-mount-boot_umount_boot_partition() {
-	# Get out fast if possible.
-	mount-boot_is_disabled && return 0
-
-	if [ -e /boot/.e.remount ] ; then
-		einfo "Automatically remounting /boot as ro as it was previously."
-		rm -f /boot/.e.remount
-		mount -o remount,ro /boot
-	elif [ -e /boot/.e.mount ] ; then
-		einfo "Automatically unmounting /boot as it was previously."
-		rm -f /boot/.e.mount
-		umount /boot
+	mount-boot_check_status
+	if ! ( shopt -s failglob; : "${ROOT}"/boot/.keep* ) 2>/dev/null ; then
+		# Create a .keep file, in case it is shadowed at the mount point
+		touch "${ROOT}"/boot/.keep 2>/dev/null
 	fi
 }
 
-mount-boot_pkg_postinst() {
-	mount-boot_umount_boot_partition
-}
+# No-op phases for backwards compatibility
+mount-boot_pkg_postinst() { :; }
 
-mount-boot_pkg_postrm() {
-	mount-boot_umount_boot_partition
-}
+mount-boot_pkg_postrm() { :; }
-- 
2.24.0

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^ permalink raw reply related	[flat|nested] 4+ messages in thread

* Re: [gentoo-dev] [PATCH] mount-boot.eclass: Check if /boot is sane, but don't try to mount it.
  2019-12-06 13:11 [gentoo-dev] [PATCH] mount-boot.eclass: Check if /boot is sane, but don't try to mount it Ulrich Müller
@ 2019-12-06 14:03 ` Michał Górny
  2019-12-06 14:45   ` Ulrich Mueller
  0 siblings, 1 reply; 4+ messages in thread
From: Michał Górny @ 2019-12-06 14:03 UTC (permalink / raw
  To: gentoo-dev

[-- Attachment #1: Type: text/plain, Size: 8452 bytes --]

On Fri, 2019-12-06 at 14:11 +0100, Ulrich Müller wrote:
> The eclass failed to remount a read-only mounted /boot, because package
> collision sanity checks in recent Portage versions prevented it from
> reaching pkg_pretend() at all. Furthermore, with the "mount-sandbox"

Did you mean: pkg_preinst?

> feature enabled, the mount won't be propagated past pkg_preinst() and
> installed files would end up under the (shadowed) mount point.
> 
> Therefore don't even attempt to mount /boot ourselves, but error out
> if it isn't mounted read/write and ask the user to mount /boot.
> 
> Also clean up and simplify. (For example, awk is a grown-up program
> which doesn't need any help from egrep or sed. :-)
> 
> Closes: https://bugs.gentoo.org/532264
> Signed-off-by: Ulrich Müller <ulm@gentoo.org>
> ---
>  eclass/mount-boot.eclass | 137 ++++++++++++---------------------------
>  1 file changed, 43 insertions(+), 94 deletions(-)
> 
> diff --git a/eclass/mount-boot.eclass b/eclass/mount-boot.eclass
> index 938df6732f4..1d7eb8bfc29 100644
> --- a/eclass/mount-boot.eclass
> +++ b/eclass/mount-boot.eclass
> @@ -1,156 +1,105 @@
> -# Copyright 1999-2015 Gentoo Foundation
> +# Copyright 1999-2019 Gentoo Authors
>  # Distributed under the terms of the GNU General Public License v2
>  
>  # @ECLASS: mount-boot.eclass
>  # @MAINTAINER:
>  # base-system@gentoo.org
>  # @BLURB: functions for packages that install files into /boot
>  # @DESCRIPTION:
>  # This eclass is really only useful for bootloaders.
>  #
>  # If the live system has a separate /boot partition configured, then this
>  # function tries to ensure that it's mounted in rw mode, exiting with an
> -# error if it can't. It does nothing if /boot isn't a separate partition.
> +# error if it can't.  It does nothing if /boot isn't a separate partition.
> +
> +case ${EAPI:-0} in
> +	4|5|6|7) ;;
> +	*) die "${ECLASS}: EAPI ${EAPI:-0} not supported" ;;
> +esac
>  
>  EXPORT_FUNCTIONS pkg_pretend pkg_preinst pkg_postinst pkg_prerm pkg_postrm
>  
>  # @FUNCTION: mount-boot_disabled
>  # @INTERNAL
>  # @DESCRIPTION:
>  # Detect whether the current environment/build settings are such that we do not
>  # want to mess with any mounts.
>  mount-boot_is_disabled() {
>  	# Since this eclass only deals with /boot, skip things when ROOT is active.
> -	if [[ "${ROOT:-/}" != "/" ]] ; then
> +	if [[ ${ROOT:-/} != "/" ]] ; then

I suppose you can unquote RHS too since it doesn't contain any pattern
characters, if you are already touching quoting.

>  		return 0
>  	fi
>  
>  	# If we're only building a package, then there's no need to check things.
> -	if [[ "${MERGE_TYPE}" == "buildonly" ]] ; then
> +	if [[ ${MERGE_TYPE} == "buildonly" ]] ; then
>  		return 0
>  	fi
>  
>  	# The user wants us to leave things be.
> -	if [[ -n ${DONT_MOUNT_BOOT} ]] ; then
> +	if [[ -n ${I_KNOW_WHAT_I_AM_DOING} ]] ; then
>  		return 0
>  	fi
>  
>  	# OK, we want to handle things ourselves.
>  	return 1
>  }
>  
>  # @FUNCTION: mount-boot_check_status
>  # @INTERNAL
>  # @DESCRIPTION:
> -# Figure out what kind of work we need to do in order to have /boot be sane.
> -# Return values are:
> -# 0 - Do nothing at all!
> -# 1 - It's mounted, but is currently ro, so need to remount rw.
> -# 2 - It's not mounted, so need to mount it rw.
> +# Check if /boot is sane, i.e., mounted read/write if on a separate
> +# partition.  Return 0 if conditions are fulfilled, otherwise die.

I don't think there's a point in explicitly defining the return value
if there is no alternative.

>  mount-boot_check_status() {
>  	# Get out fast if possible.
>  	mount-boot_is_disabled && return 0
>  
>  	# note that /dev/BOOT is in the Gentoo default /etc/fstab file
> -	local fstabstate=$(awk '!/^#|^[[:blank:]]+#|^\/dev\/BOOT/ {print $2}' /etc/fstab | egrep "^/boot$" )
> -	local procstate=$(awk '$2 ~ /^\/boot$/ {print $2}' /proc/mounts)
> -	local proc_ro=$(awk '{ print $2 " ," $4 "," }' /proc/mounts | sed -n '/^\/boot .*,ro,/p')
> -
> -	if [ -n "${fstabstate}" ] && [ -n "${procstate}" ] ; then
> -		if [ -n "${proc_ro}" ] ; then
> -			echo
> -			einfo "Your boot partition, detected as being mounted at /boot, is read-only."
> -			einfo "It will be remounted in read-write mode temporarily."
> -			return 1
> -		else
> -			echo
> -			einfo "Your boot partition was detected as being mounted at /boot."
> -			einfo "Files will be installed there for ${PN} to function correctly."
> -			return 0
> -		fi
> -	elif [ -n "${fstabstate}" ] && [ -z "${procstate}" ] ; then
> -		echo
> -		einfo "Your boot partition was not mounted at /boot, so it will be automounted for you."
> -		einfo "Files will be installed there for ${PN} to function correctly."
> -		return 2
> -	else
> -		echo
> +	local fstabstate=$(awk '!/^[[:blank:]]*#|^\/dev\/BOOT/ && $2 == "/boot" \
> +		{print $2}' /etc/fstab)

The 'print' here is used as a boolean... why not use a boolean output
instead?

> +
> +	if [[ -z ${fstabstate} ]] ; then
>  		einfo "Assuming you do not have a separate /boot partition."
>  		return 0
>  	fi
> -}
>  
> -mount-boot_pkg_pretend() {
> -	# Get out fast if possible.
> -	mount-boot_is_disabled && return 0
> +	local procstate=$(awk '$2 == "/boot" \
> +		{print gensub(/^(.*,)?(ro|rw)(,.*)?$/, "\\2", 1, $4)}' /proc/mounts)

Shouldn't this use /proc/self/mounts?

>  
> -	elog "To avoid automounting and auto(un)installing with /boot,"
> -	elog "just export the DONT_MOUNT_BOOT variable."
> -	mount-boot_check_status
> +	if [[ -z ${procstate} ]] ; then
> +		eerror "Your boot partition is not mounted at /boot."
> +		eerror "Please mount it and retry."
> +		die	"/boot not mounted"
> +	fi
> +
> +	if [[ ${procstate} == "ro" ]] ; then
> +		eerror "Your boot partition, detected as being mounted at /boot," \
> +			"is read-only."
> +		eerror "Please remount it read/write and retry."
> +		die	"/boot mounted read-only"
> +	fi
> +
> +	einfo "Your boot partition was detected as being mounted at /boot."
> +	einfo "Files will be installed there for ${PN} to function correctly."
> +	return 0
>  }
>  
> -mount-boot_mount_boot_partition() {
> +mount-boot_pkg_pretend() {
>  	mount-boot_check_status
> -	case $? in
> -	0)	# Nothing to do.
> -		;;
> -	1)	# Remount it rw.
> -		mount -o remount,rw /boot
> -		if [ $? -ne 0 ] ; then
> -			echo
> -			eerror "Unable to remount in rw mode. Please do it manually!"
> -			die "Can't remount in rw mode. Please do it manually!"
> -		fi
> -		touch /boot/.e.remount
> -		;;
> -	2)	# Mount it rw.
> -		mount /boot -o rw
> -		if [ $? -ne 0 ] ; then
> -			echo
> -			eerror "Cannot automatically mount your /boot partition."
> -			eerror "Your boot partition has to be mounted rw before the installation"
> -			eerror "can continue. ${PN} needs to install important files there."
> -			die "Please mount your /boot partition manually!"
> -		fi
> -		touch /boot/.e.mount
> -		;;
> -	esac
>  }
>  
>  mount-boot_pkg_preinst() {
> -	# Handle older EAPIs.
> -	case ${EAPI:-0} in
> -	[0-3]) mount-boot_pkg_pretend ;;
> -	esac
> -
> -	mount-boot_mount_boot_partition
> +	mount-boot_check_status
>  }
>  
>  mount-boot_pkg_prerm() {
> -	touch "${ROOT}"/boot/.keep 2>/dev/null
> -	mount-boot_mount_boot_partition
> -	touch "${ROOT}"/boot/.keep 2>/dev/null
> -}
> -
> -mount-boot_umount_boot_partition() {
> -	# Get out fast if possible.
> -	mount-boot_is_disabled && return 0
> -
> -	if [ -e /boot/.e.remount ] ; then
> -		einfo "Automatically remounting /boot as ro as it was previously."
> -		rm -f /boot/.e.remount
> -		mount -o remount,ro /boot
> -	elif [ -e /boot/.e.mount ] ; then
> -		einfo "Automatically unmounting /boot as it was previously."
> -		rm -f /boot/.e.mount
> -		umount /boot
> +	mount-boot_check_status
> +	if ! ( shopt -s failglob; : "${ROOT}"/boot/.keep* ) 2>/dev/null ; then

EROOT?

> +		# Create a .keep file, in case it is shadowed at the mount point
> +		touch "${ROOT}"/boot/.keep 2>/dev/null
>  	fi
>  }
>  
> -mount-boot_pkg_postinst() {
> -	mount-boot_umount_boot_partition
> -}
> +# No-op phases for backwards compatibility
> +mount-boot_pkg_postinst() { :; }
>  
> -mount-boot_pkg_postrm() {
> -	mount-boot_umount_boot_partition
> -}
> +mount-boot_pkg_postrm() { :; }

-- 
Best regards,
Michał Górny


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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [gentoo-dev] [PATCH] mount-boot.eclass: Check if /boot is sane, but don't try to mount it.
  2019-12-06 14:03 ` Michał Górny
@ 2019-12-06 14:45   ` Ulrich Mueller
  2019-12-06 15:04     ` Michał Górny
  0 siblings, 1 reply; 4+ messages in thread
From: Ulrich Mueller @ 2019-12-06 14:45 UTC (permalink / raw
  To: Michał Górny; +Cc: gentoo-dev

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>>>>> On Fri, 06 Dec 2019, Michał Górny wrote:

>> reaching pkg_pretend() at all. Furthermore, with the "mount-sandbox"

> Did you mean: pkg_preinst?

Of course.

>> -	if [[ "${ROOT:-/}" != "/" ]] ; then
>> +	if [[ ${ROOT:-/} != "/" ]] ; then

> I suppose you can unquote RHS too since it doesn't contain any pattern
> characters, if you are already touching quoting.

Quotes dropped (globally).

>> +# Check if /boot is sane, i.e., mounted read/write if on a separate
>> +# partition.  Return 0 if conditions are fulfilled, otherwise die.

> I don't think there's a point in explicitly defining the return value
> if there is no alternative.

Fixed.

>> +	local fstabstate=$(awk '!/^[[:blank:]]*#|^\/dev\/BOOT/ && $2 == "/boot" \
>> +		{print $2}' /etc/fstab)

> The 'print' here is used as a boolean... why not use a boolean output
> instead?

Changed, it's printing a 1 now.

>> +	local procstate=$(awk '$2 == "/boot" \
>> +		{print gensub(/^(.*,)?(ro|rw)(,.*)?$/, "\\2", 1, $4)}' /proc/mounts)

> Shouldn't this use /proc/self/mounts?

I haven't actually changed this, it was /proc/mounts before (which is a
symlink to self/mounts). Maybe we should keep it as-is for backwards
compatibility? (But TBH, I have no idea with which kernel version
/proc/self/mounts appeared.)

>> +	mount-boot_check_status
>> +	if ! ( shopt -s failglob; : "${ROOT}"/boot/.keep* ) 2>/dev/null ; then

> EROOT?

Hm, we mount /boot, not ${EROOT}/boot. I've added an additional test for
[[ ${EROOT:-/} == / ]] before touching the file.

Patch v2 will follow.

Ulrich

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^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [gentoo-dev] [PATCH] mount-boot.eclass: Check if /boot is sane, but don't try to mount it.
  2019-12-06 14:45   ` Ulrich Mueller
@ 2019-12-06 15:04     ` Michał Górny
  0 siblings, 0 replies; 4+ messages in thread
From: Michał Górny @ 2019-12-06 15:04 UTC (permalink / raw
  To: gentoo-dev

[-- Attachment #1: Type: text/plain, Size: 1189 bytes --]

On Fri, 2019-12-06 at 15:45 +0100, Ulrich Mueller wrote:
> > > +	local fstabstate=$(awk '!/^[[:blank:]]*#|^\/dev\/BOOT/ && $2 == "/boot" \
> > > +		{print $2}' /etc/fstab)
> > The 'print' here is used as a boolean... why not use a boolean output
> > instead?
> 
> Changed, it's printing a 1 now.

Well, I actually meant using exit status ;-).  Would be also have the
benefit of terminating early.

> 
> > > +	local procstate=$(awk '$2 == "/boot" \
> > > +		{print gensub(/^(.*,)?(ro|rw)(,.*)?$/, "\\2", 1, $4)}' /proc/mounts)
> > Shouldn't this use /proc/self/mounts?
> 
> I haven't actually changed this, it was /proc/mounts before (which is a
> symlink to self/mounts). Maybe we should keep it as-is for backwards
> compatibility? (But TBH, I have no idea with which kernel version
> /proc/self/mounts appeared.)

Ok.

> 
> > > +	mount-boot_check_status
> > > +	if ! ( shopt -s failglob; : "${ROOT}"/boot/.keep* ) 2>/dev/null ; then
> > EROOT?
> 
> Hm, we mount /boot, not ${EROOT}/boot. I've added an additional test for
> [[ ${EROOT:-/} == / ]] before touching the file.
> 
> Patch v2 will follow.
> 

Thanks.

-- 
Best regards,
Michał Górny


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^ permalink raw reply	[flat|nested] 4+ messages in thread

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2019-12-06 13:11 [gentoo-dev] [PATCH] mount-boot.eclass: Check if /boot is sane, but don't try to mount it Ulrich Müller
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2019-12-06 14:45   ` Ulrich Mueller
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