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#!/bin/bash # This file must be executable to work! chmod 755! # Automagically mount CIFS shares in the network, similar to # what autofs -hosts does for NFS. # Put a line like the following in /etc/auto.master: # /cifs /etc/auto.smb --timeout=300 # You'll be able to access Windows and Samba shares in your network # under /cifs/host.domain/share # "smbclient -L" is used to obtain a list of shares from the given host. # In some environments, this requires valid credentials. # This script knows 2 methods to obtain credentials: # 1) if a credentials file (see mount.cifs(8)) is present # under /etc/creds/$key, use it. # 2) Otherwise, try to find a usable kerberos credentials cache # for the uid of the user that was first to trigger the mount # and use that. # If both methods fail, the script will try to obtain the list # of shares anonymously. get_krb5_cache() { cache= uid=${UID} for x in $(ls -d /run/user/$uid/krb5cc_* 2>/dev/null); do if [ -d "$x" ] && klist -s DIR:"$x"; then cache=DIR:$x return fi done if [ -f /tmp/krb5cc_$uid ] && klist -s /tmp/krb5cc_$uid; then cache=/tmp/krb5cc_$uid return fi } key="$1" opts="-fstype=cifs" for P in /bin /sbin /usr/bin /usr/sbin do if [ -x $P/smbclient ] then SMBCLIENT=$P/smbclient break fi done [ -x $SMBCLIENT ] || exit 1 creds=/etc/creds/$key if [ -f "$creds" ]; then opts="$opts"',uid=$UID,gid=$GID,credentials='"$creds" smbopts="-A $creds" else get_krb5_cache if [ -n "$cache" ]; then opts="$opts"',multiuser,cruid=$UID,sec=krb5i' smbopts="-k" export KRB5CCNAME=$cache else opts="$opts"',guest' smbopts="-N" fi fi $SMBCLIENT $smbopts -gL "$key" 2>/dev/null| awk -v "key=$key" -v "opts=$opts" -F '|' -- ' BEGIN { ORS=""; first=1 } /Disk/ { if (first) print opts; first=0 dir = $2 loc = $2 # Enclose mount dir and location in quotes print " \\\n\t \"/" dir "\"", "\"://" key "/" loc "\"" } END { if (!first) print "\n"; else exit 1 } '