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mounting_sdf_folders_on_a_netbsd_local_machine_via_mount_psshfs [2021/03/22 05:35] – created hc9mounting_sdf_folders_on_a_netbsd_local_machine_via_mount_psshfs [2021/03/22 05:41] (current) – [Mounting SDF Folders on a NetBSD Local Machine via mount_psshfs(8)] hc9
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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 $HOME directory under /mnt:
 +
 +<code>
 +sudo mount_psshfs -o ro sdf_user@freeshell.org /mnt
 +sdf_user@freeshell.org's password: ********
 +</code>
 +
 +Use the mount(8) command to see what the mount looks like:
 +
 +<code>
 +mount -t puffs\|psshfs
 +sdf_user@freeshell.org on /mnt type puffs|psshfs (read-only)
 +</code>
 +
 +**ex.2)** mount sdf_user@freeshell.org/gopher read-write with compression and public key authentication:
 +
 +<code>
 +sudo mount_psshfs -O Compression=yes -O IdentityFile=/home/local_user/.ssh/id_rsa sdf_user@freeshell.org:gopher /mnt
 +</code>
 +
 +For help setting up public key authentication see the [[:using_ssh_for_connections_transfer_to_from_sdf#ssh_public_key_authentication|SSH-SDF]] tutorial.
 +
 +**ex.3)** put the above in /etc/fstab; mount to local /puffsmnt:
 +
 +<code>
 +sudo mkdir /puffsmnt
 +
 +sudoedit /etc/fstab
 +...
 +# psshfs PUFFS mount of gopher dir on sdf_user@.sdf.org
 +sdf_user@sdf.org:/ftp/pub/users/sdf_user /puffsmnt psshfs rw,noauto,-O=BatchMode=yes, O=IdentityFile=$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 $HOME directory and mounts /puffsmnt from ex.4 above:
 +
 +**ex.5)** mount /puffsmnt to ~local_user/puffy with local_user:users permissions:
 +
 +First, we find who's who on local system (note: UID/GID are fields 3 & 4):
 +
 +<code>
 +ls -dnl /puffsmnt
 +drwxr-xr-x  42 012345  550         512 Aug  31  2011 puffsmnt
 +
 +grep local_user /etc/passwd
 +local_user:*:1000:100:Loco User ,Seattle,WA ,:/home/local_user:/bin/ksh
 +</code>
 +
 +From above we see that we need to re-map local UID 1000 to 012345, and local GID 100 to 550. We just have one remapping each so the uid-mapfile and gid-mapfile files get made like so:
 +
 +<code>
 +sudoedit /uid-mapfile
 +1
 +1000 012345
 +
 +sudoedit /gid-mapfile
 +1
 +100 550
 +</code>
 +
 +Now we make the ~local_user/puffy dir and mount the umap sub-tree of /puffsmnt on it:
 +
 +<code>
 +mkdir ~local_user/puffy
 +sudo mount_umap -o nocoredump -g /gid-mapfile -u /uid-mapfile /puffsmnt ~local_user/puffy
 +</code>
 +
 +Use mount(8) and ls(1) to see what the umap mount looks like:
 +
 +<code>
 +mount -t umap
 +/puffsmnt on /home/local_user/puffy type umap (nocoredump)
 +
 +ls -dl ~local_user/puffy
 +drwxr-xr-x  101 local_user   users      512 Dec  6  2010 puffy
 +</code>
 +
 +Alternately, you can add the umap mount to /etc/fstab:
 +
 +<code>
 +sudoedit /etc/fstab
 +...
 +/puffsmnt /home/local_user/puffy umap rw,noauto,nocoredump,-g=/gid-mapfile,-u=/uid-mapfile
 +
 +sudo mount ~local_user/puffy
 +</code>
 +
 +==== Unmounting umap and psshfs mounts: ====
 +
 +Unmount umap and psshfs mounts in the usual way with umount(8), but do it in //reverse// order:
 +
 +<code>
 +sudo umount ~local_user/puffy
 +sudo umount /puffsmnt
 +</code>
 +
 +==== References: ====
 +
 +  * [[http://www.netbsd.org/docs/puffs/|NetBSD PUFFS documentation]]
 +  * [[http://man.netbsd.org/|NetBSD manpages]]
 +
 +$Id: psshfs.html,v 1.2 2011/12/13 05:53:48 jgw Exp $ [[http://sdf.org/?tutorials/psshfs|Mounting SDF Folders on a NetBSD Local Machine via mount_psshfs(8)]] - traditional link (using [[wp>Revision_Control_System|RCS]])