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.IX Title "mount.posixovl 8"
.TH mount.posixovl 8 2024-03-20 "mount.posixovl" "User Commands"
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.SH NAME
posixovl \-\- FUSE file system that provides POSIX functionality
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&    mount.posixovl [\-F] [\-S SOURCE_DIR] TARGET_DIR [\-\- fuseopts]
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
If no source directory is given, the TARGET_DIR specifies both source
and target (mount point), yielding an "over mount".
.PP
Supports: chmod, chown, hardlink, mkfifo, mknod, symlink/readlink
ACLs/xattrs (only in passthrough mode, no emulation).
.SH NOTES
.IX Header "NOTES"
Using posixovl on an already POSIX-behaving file system (e.g. XFS)
incurs some issues, since detecting whether a path is POSIX behaving
or not is difficult. Hence, the following decision was made:
.PP
.Vb 4
\&    \- permissions will be set to the default permissions (see below) unless
\&      a HCB is found that can override these
\&    \- all lower\-level files will be operated on/created with the user who
\&      initiated the mount
.Ve
.PP
If no HCB exists for a file or directory, the default permissions are
644 and 755, respectively. The owner and group of the inode will be the
owner/group of the real file.
.PP
Each non-regular, non-directory virtual file will have a zero-size real
file. Simplifies handling, and makes it apparent the object exists
when using other operating system.
.PP
Command \fBdf\fR\|(1) will show:
.PP
.Vb 5
\&    $ df \-Tah
\&    File System    Type    Size  Used Avail Use% Mounted on
\&    /dev/hda5     vfat    5.9G  2.1G  3.9G  35% /windows/D
\&    posix\-overlay(/windows/D)
\&         fuse.posixovl    5.9G  2.1G  3.9G  35% /windows/D
.Ve
.SH OPTIONS
.IX Header "OPTIONS"
.IP \fB\-F\fR 4
.IX Item "-F"
Option \fB\-F\fR will disable permission and ownership checks that would
be required in case you have a POSIX mount over VFAT. For example,
where /vfat is vfat, and /vfat/xfs is a POSIX-behaving file system.
.SH EXAMPLES
.IX Header "EXAMPLES"
In general, posixovl does not handle case-insensitivity of the
underlying file system (in case of VFAT, for example). If you create a
file \fIX0\fR on VFAT, it is usually lowercased to \fIx0\fR, which may break
some software, namely X.org. In order to make VFAT behave more
POSIX-like, the following mount options are recommended:
.PP
.Vb 1
\&    mount \-t vfat /dev/sda5 /mnt/vfat \-o check=s,shortname=mixed
.Ve
.SH ENVIRONMENT
.IX Header "ENVIRONMENT"
None.
.SH FILES
.IX Header "FILES"
None.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBmount\fR\|(1)
\&\fBumount\fR\|(1)
.SH AUTHORS
.IX Header "AUTHORS"
Program was written by Jan Engelhardt <jengelh@users.sourceforge.net>.
.PP
This manual page was written by Jari Aalto <jari.aalto@cante.net>, for
the Debian GNU system (but may be used by others). Released under
license GNU GPL version 2 or (at your option) any later version. For
more information about license, visit
<http://www.gnu.org/copyleft/gpl.html>.