mtab: move toward requiring /etc/mtab to be a symbolic link

This changes the mtab service in the following way:

- If /etc/mtab is a symbolic link, success is returned.
- If /etc is not writable, we warn that we could not update /etc/mtab
  and return success.
- If /etc/mtab does not exist, we create a symbolic link from
  /etc/mtab to /proc/self/mounts.
- Otherwise, we warn that updating /etc/mtab as a file is
  deprecated and continue to update it after outputting instructions to
  the user for how to move it to a symbolic link.
This commit is contained in:
William Hubbs 2015-04-25 15:37:52 -05:00
parent a8c6dbac96
commit a6391f44ee

View File

@ -12,20 +12,20 @@ depend()
start()
{
if [ -L /etc/mtab ]; then
return 0
fi
[ -L /etc/mtab ] && return 0
local rc=0
ebegin "Updating /etc/mtab"
vewarn "The support for updating /etc/mtab as a file is"
vewarn "deprecated and will be removed in the future."
vewarn "Please run the following command as root on your system."
vewarn
vewarn "ln -snf /proc/self/mounts /etc/mtab"
if ! echo 2>/dev/null >/etc/mtab; then
ewend 1 "/etc/mtab is not updateable"
return 0
fi
if ! checkpath -W /etc; then
rc=1
elif [ ! -e /etc/mtab ]; then
ln -snf /proc/self/mounts /etc/mtab
else
ewarn "The support for updating /etc/mtab as a file is"
ewarn "deprecated and will be removed in the future."
ewarn "Please run the following command as root on your system."
ewarn
ewarn "ln -snf /proc/self/mounts /etc/mtab"
ewarn
# With / as tmpfs we cannot umount -at tmpfs in localmount as that
# makes / readonly and dismounts all tmpfs even if in use which is
@ -35,5 +35,7 @@ start()
# Remove stale backups
rm -f /etc/mtab~ /etc/mtab~~
eend 0
fi
eend $rc "/etc is not writable; unable to create /etc/mtab"
return 0
}