Table of Contents
Mounting SDF Folders on a NetBSD Local Machine via mount_psshfs(8)
What is mount_psshfs(8) ?
NetBSD has its own implementation of 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 $HOME directory under /mnt:
sudo mount_psshfs -o ro email@example.com /mnt firstname.lastname@example.org's password: ********
Use the mount(8) command to see what the mount looks like:
mount -t puffs\|psshfs email@example.com on /mnt type puffs|psshfs (read-only)
ex.2) mount firstname.lastname@example.org/gopher read-write with compression and public key authentication:
sudo mount_psshfs -O Compression=yes -O IdentityFile=/home/local_user/.ssh/id_rsa email@example.com:gopher /mnt
For help setting up public key authentication see the SSH-SDF tutorial.
ex.3) put the above in /etc/fstab; mount to local /puffsmnt:
sudo mkdir /puffsmnt sudoedit /etc/fstab ... # psshfs PUFFS mount of gopher dir on sdf_user@.sdf.org firstname.lastname@example.org:/ftp/pub/users/sdf_user /puffsmnt psshfs rw,noauto,-O=BatchMode=yes, O=IdentityFile=$HOME/.ssh/id_rsa,-t=-1 sudo mount /puffsmnt
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
$Id: psshfs.html,v 1.2 2011/12/13 05:53:48 jgw Exp $ Mounting SDF Folders on a NetBSD Local Machine via mount_psshfs(8) - traditional link (using RCS)