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—tutorials:psshfs [2012/01/29 04:40] (current) – Import from sdf memnon
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 +===== Mounting SDF Folders on a NetBSD Local Machine via mount_psshfs(8) =====
 +
 +==== What is mount_psshfs(8) ? ====
 +
 +[[http://netbsd.org/|NetBSD]] has its own implementation of [[http://fuse.sourceforge.net/|FUSE]] called ReFUSE(3); mount_psshfs(8) creates sshfs mounts via PUFFS(4) (Pass-to-Userspace Framework File System). See the respective manpages and References section for details.
 +
 +==== Creating basic psshfs mounts ====
 +
 +You'll likely need root permissions to run mount_psshfs(8); examples below assume the sudo(8) tool is installed.
 +
 +=== ex.1) create a basic read-only mount of an SDF user's $HOME directory under /mnt ===
 +
 +  sudo mount_psshfs -o ro sdf_user@freeshell.org /mnt
 +  sdf_user@freeshell.org's password: ********
 +
 +Use the mount(8) command to see what the mount looks like:
 +
 +  mount -t puffs\|psshfs
 +  sdf_user@freeshell.org on /mnt type puffs|psshfs (read-only)
 +
 +=== ex.2) mount sdf_user@freeshell.org/gopher read-write with compression and public key authentication ===
 +
 +  sudo mount_psshfs -O Compression=yes -O IdentityFile=/home/local_user/.ssh/id_rsa sdf_user@freeshell.org:gopher /mnt
 +
 +For help setting up public key authentication see the [[https://sdfeu.org/tutorials:ssh-sdf#ssh_public_key_authentication|SSH-SDF tutorial]].
 +
 +=== ex.3) put the above in /etc/fstab; mount to local /puffsmnt ===
 +<code>
 +  sudo mkdir /puffsmnt
 +  sudoedit /etc/fstab
 +  ...
 +  # psshfs PUFFS mount of gopher dir on sdf_user@.sdf.org
 +  sdf_user@sdf.org:/ftp/pub/users/sdf_user /puffsmnt psshfs rw,noauto,-O=BatchMode=yes,-O=IdentityFile=$HOME/.ssh/id_rsa,-t=-1
 +
 +  sudo mount /puffsmnt
 +</code>
 +==== Fixing the displayed file permissions with mount_umap(8)  ====
 +
 +With the above examples you'll probably notice that the UID:GID values for the psshfs mount are either numerical values or otherwise not what you might expect; this is because your local system doesn't have mappings for the remote UID:GID (what you're seeing) to the local system. If you like, you can create a local //sub-tree// of the puffs mount with re-mapped UID:GID values using mount_umap(8). The following example creates two mapfiles (must be root owned) and a new mount point under the local user's $HOME directory and mounts /puffsmnt from ex.4 above:
 +
 +=== ex.5) mount /puffsmnt to ~local_user/puffy with local_user:users permissions ===
 +
 +First, we find who's who on local system (note: UID/GID are fields 3 & 4):
 +
 +  ls -dnl /puffsmnt
 +  drwxr-xr-x  42 012345  550         512 Aug  31  2011 puffsmnt
 +
 +  grep local_user /etc/passwd
 +  local_user:*:1000:100:Loco User ,Seattle,WA ,:/home/local_user:/bin/ksh
 +
 +From above we see that we need to re-map local UID 1000 to 012345, and local GID 100 to 550. We just have one remapping each so the uid-mapfile and gid-mapfile files get made like so:
 +
 +  sudoedit /uid-mapfile
 +  1
 +  1000 012345
 +
 +  sudoedit /gid-mapfile
 +  1
 +  100 550
 +
 +Now we make the ~local_user/puffy dir and mount the umap sub-tree of /puffsmnt on it:
 +
 +  mkdir ~local_user/puffy
 +  sudo mount_umap -o nocoredump -g /gid-mapfile -u /uid-mapfile /puffsmnt ~local_user/puffy
 +
 +Use mount(8) and ls(1) to see what the umap mount looks like:
 +
 +  mount -t umap /puffsmnt on /home/local_user/puffy type umap (nocoredump)
 +  ls -dl ~local_user/puffy
 +  drwxr-xr-x  101 local_user   users      512 Dec  6  2010 puffy
 +
 +Alternately, you can add the umap mount to /etc/fstab:
 +
 +  sudoedit /etc/fstab
 +  ...
 +  /puffsmnt /home/local_user/puffy umap rw,noauto,nocoredump,-g=/gid-mapfile,-u=/uid-mapfile
 +
 +  sudo mount ~local_user/puffy
 +
 +==== Unmounting umap and psshfs mounts ====
 +
 +Unmount umap and psshfs mounts in the usual way with umount(8), but do it in reverse order:
 +
 +  sudo umount ~local_user/puffy
 +  sudo umount /puffsmnt
 +
 +References:
 +
 +  * [[http://www.netbsd.org/docs/puffs/|NetBSD PUFFS documentation]]
 +  * [[http://man.netbsd.org/|NetBSD manpages]]
 +