guestunmount - Unmount a guestmounted filesystem
guestunmount mountpoint
guestunmount --fd=<FD> mountpoint
guestunmount is a utility to clean up mounted filesystems automatically.
guestmount(1) mounts filesystems using libguestfs. This program
unmounts the filesystem when a program or script has finished with it.
guestunmount is a wrapper around the FUSE
fusermount(1) program, which
must exist on the current "PATH".
There are two ways to use guestunmount. When called as:
guestunmount mountpoint
it unmounts "mountpoint" immediately.
When called as:
guestunmount --fd=FD mountpoint
it waits until the pipe "FD" is closed. This can be used to monitor
another process and clean up its mountpoint when that process exits, as
described below.
You can just call "guestunmount mountpoint" from the program, but a
more sophisticated way to use guestunmount is to have it monitor your program
so it can clean up the mount point if your program exits unexpectedly.
In the program, create a pipe (eg. by calling
pipe(2)). Let
"FD" be the file descriptor number of the read side of the pipe (ie.
"pipefd[0]").
After mounting the filesystem with
guestmount(1) (on
"mountpoint"), fork and run guestunmount like this:
guestunmount --fd=FD mountpoint
Close the read side of the pipe in the parent process.
Now, when the write side of the pipe (ie. "pipefd[1]") is closed for
any reason, either explicitly or because the parent process exits,
guestunmount notices and unmounts the mountpoint.
If your operating system supports it, you should set the "FD_CLOEXEC"
flag on the write side of the pipe. This is so that other child processes
don't inherit the file descriptor and keep it open.
Guestunmount never daemonizes itself.
Since bash doesn't provide a way to create an unnamed pipe, use a trap to call
guestunmount on exit like this:
trap "guestunmount mountpoint" EXIT INT QUIT TERM
- --fd=FD
- Specify the pipe file descriptor to monitor, and delay
cleanup until that pipe is closed.
- --help
- 簡単なヘルプを表示して、終了します。
- -q
- --quiet
- Don’t display error messages from fusermount. The
return status is still set (see "EXIT STATUS" below).
- --no-retry
- --retry=N
- By default, guestunmount will retry the fusermount
operation up to 5 times (that is, it will run it up to
6 times = 1 try + 5 retries).
Use --no-retry to make guestunmount run fusermount only once.
Use --retry=N to make guestunmount retry "N" times instead
of 5.
guestunmount performs an exponential back-off between retries, waiting
1 second, 2 seconds, 4 seconds, etc before each
retry.
- -V
- --version
- プログラムのバージョンを表示して、終了します。
- "PATH"
- The fusermount(1) program (supplied by FUSE) must be
available on the current "PATH".
This program returns 0 if successful, or one of the following error codes:
- 1
- Program error, eg. could not allocate memory, could not run
fusermount. See the error message printed for more information.
- 2
- The mount point could not be unmounted even after retrying.
See the error message printed for the underlying fusermount error.
- 3
- The mount point is not mounted.
guestmount(1),
fusermount(1),
pipe(2), "MOUNT
LOCAL" in
guestfs(3),
http://libguestfs.org/,
http://fuse.sf.net/.
Richard W.M. Jones ("rjones at redhat dot com")
Copyright (C) 2013 Red Hat Inc.
To get a list of bugs against libguestfs, use this link:
https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
To report a new bug against libguestfs, use this link:
https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
When reporting a bug, please supply:
- •
- The version of libguestfs.
- •
- Where you got libguestfs (eg. which Linux distro, compiled
from source, etc)
- •
- Describe the bug accurately and give a way to reproduce
it.
- •
- Run libguestfs-test-tool(1) and paste the
complete, unedited output into the bug report.