universal sshfs Automount

readme.md

Universal sshfs automount setup

This gist requires autofs and sshfs be installed on your system. You must have ssh access to each host you would like to automount via a passwordless ssh key.

The script currently expects a the key to be named $HOME/.ssh/id_ed25519 but you can change it if you like.

/etc/auto.master

Make sure the following line is in your /etc/auto.master it will source the files in /etc/auto.master.d/

# /etc/auto.master
+dir:/etc/auto.master.d

You will also need to install the following files. The auto.sshfs script must be executable! (it executes and then feeds it's output to the automount command)

trigger to the automount of the remote host by going to /net/sshfs/username@hostname

auto.sshfs

#!/bin/bash
# /etc/auto.sshfs   automount script
# This file must be executable to work! ( chmod 755 )
key="${1/%:/}"
user="${key/@*/}"
t="${key/*@/}"
server="${t/:*/}"
tp="${t/*:/}"
port="${tp/\/*/}"

if [ $port = $server ]; then
  port=22
fi


if [[ $(find /etc/sshfs/$server/uidfile -mtime +7 -print 2>&1 ) ]]; then
  mkdir -p /etc/sshfs/$server
  ssh -p $port -i /home/${user}/.ssh/id_ed25519 ${user}@${server} 'cat /etc/passwd | cut -d ":" -f1,3' > /etc/sshfs/$server/uidfile
  ssh -p $port -i /home/${user}/.ssh/id_ed25519 ${user}@${server} 'cat /etc/group  | cut -d ":" -f1,3' > /etc/sshfs/$server/gidfile
fi

mountopts="-fstype=fuse,rw,nodev,nonempty,noatime,allow_other,max_read=65536,port=${port},\
idmap=file,uidfile=/etc/sshfs/$server/uidfile,gidfile=/etc/sshfs/$server/gidfile,\
StrictHostKeyChecking=no,cache_timeout=3600,IdentityFile=\$HOME/.ssh/id_ed25519"

echo "$mountopts :sshfs#${user}@${server}:/"

sshfs.autofs

# /etc/auto.master.d/sshfs.autofs
# /net/sshfs needs to exist to trigger this rule!
/net/sshfs /etc/auto.sshfs --timeout=60