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

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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
1 changed files with 24 additions and 22 deletions
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46
init.d/mtab.in
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@ -12,28 +12,30 @@ depend()
start() start()
{ {
if [ -L /etc/mtab ]; then [ -L /etc/mtab ] && return 0
return 0 local rc=0
fi
ebegin "Updating /etc/mtab" ebegin "Updating /etc/mtab"
vewarn "The support for updating /etc/mtab as a file is" if ! checkpath -W /etc; then
vewarn "deprecated and will be removed in the future." rc=1
vewarn "Please run the following command as root on your system." elif [ ! -e /etc/mtab ]; then
vewarn ln -snf /proc/self/mounts /etc/mtab
vewarn "ln -snf /proc/self/mounts /etc/mtab" else
if ! echo 2>/dev/null >/etc/mtab; then ewarn "The support for updating /etc/mtab as a file is"
ewend 1 "/etc/mtab is not updateable" ewarn "deprecated and will be removed in the future."
return 0 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
# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts
# which allows this hack to work.
grep -v "^[! ]* / tmpfs " /proc/mounts > /etc/mtab
# Remove stale backups
rm -f /etc/mtab~ /etc/mtab~~
fi fi
eend $rc "/etc is not writable; unable to create /etc/mtab"
# With / as tmpfs we cannot umount -at tmpfs in localmount as that return 0
# makes / readonly and dismounts all tmpfs even if in use which is
# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts
# which allows this hack to work.
grep -v "^[! ]* / tmpfs " /proc/mounts > /etc/mtab
# Remove stale backups
rm -f /etc/mtab~ /etc/mtab~~
eend 0
} }