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mtab: make /etc/mtab as a file configurable

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This commit is contained in:
William Hubbs 2015-10-14 10:41:14 -05:00
parent 7da72ce487
commit b29b2fb3cb
4 changed files with 37 additions and 8 deletions
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23
NEWS.md
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@ -3,6 +3,29 @@
This file will contain a list of notable changes for each release. Note
the information in this file is in reverse order.
## OpenRC-0.18.3
Modern Linux systems expect /etc/mtab to be a symbolic link to
/proc/self/mounts. Reasons for this change include support for mount
namespaces, which will not work if /etc/mtab is a file.
By default, the mtab service enforces this on each reboot.
If you find that this breaks your system in some way, please do the
following:
- Set mtab_is_file=yes in /etc/conf.d/mtab.
- Restart mtab. This will recreate the /etc/mtab file.
- Check for an issue on https://github.com/openrc/openrc/issues
explaining why you need /etc/mtab to be a file. If there isn't one,
please open one and explain in detail why you need this to be a file.
If there is one, please add your comments to it. Please give concrete
examples of why it is important that /etc/mtab be a file instead of a
symbolic link. Those comments will be taken into consideration for how
long to keep supporting mtab as a file or when the support can be
removed.
## OpenRC-0.18
The behaviour of localmount and netmount in this version is changing. In

2
conf.d/Makefile
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@ -15,7 +15,7 @@ include ${MK}/os.mk
CONF-FreeBSD= ipfw moused powerd rarpd savecore syscons
CONF-Linux= consolefont devfs dmesg hwclock keymaps killprocs modules
CONF-Linux= consolefont devfs dmesg hwclock keymaps killprocs modules mtab
CONF-NetBSD= moused rarpd savecore

5
conf.d/mtab Normal file
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@ -0,0 +1,5 @@
# This setting controls whether /etc/mtab is a file or symbolic link.
# Most of the time, you shouldn't touch this. However, if the default
# breaks your system in some way, please see the NEWS.md file that comes
# with OpenRC for the actions to take.
# mtab_is_file=no

15
init.d/mtab.in
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@ -14,16 +14,17 @@ start()
{
local rc=0
ebegin "Updating /etc/mtab"
if [ -L /etc/mtab ] ; then
ewarn "/etc/mtab is a symlink, not updating."
ewarn "FYI - You can safely remove mtab from your runlevels."
elif ! checkpath -W /etc; then
if ! checkpath -W /etc; then
rc=1
elif [ ! -e /etc/mtab ]; then
einfo "Creating mtab symlink"
elif ! yesno ${mtab_is_file:-no}; then
[ ! -L /etc/mtab ] && [ -f /etc/mtab] &&
ewarn "Removing /etc/mtab file"
einfo "Creating mtab symbolic link"
ln -snf /proc/self/mounts /etc/mtab
else
einfo "Updating mtab file"
[ -L /etc/mtab ] && ewarn "Removing /etc/mtab symbolic link"
rm -f /etc/mtab
einfo "Creating mtab file"
# With / as tmpfs we cannot umount -at tmpfs in localmount as that
# makes / readonly and dismounts all tmpfs even if in use which is
# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts