guestunmount(1)

1guestunmount(1)             Virtualization Support             guestunmount(1)
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NAME

6       guestunmount - Unmount a guestmounted filesystem
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SYNOPSIS

9        guestunmount mountpoint
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11        guestunmount --fd=<FD> mountpoint
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DESCRIPTION

14       guestunmount is a utility to clean up mounted filesystems
15       automatically.  guestmount(1) mounts filesystems using libguestfs.
16       This program unmounts the filesystem when a program or script has
17       finished with it.
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19       guestunmount is a wrapper around the FUSE fusermount(1) program, which
20       must exist on the current "PATH".
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22       There are two ways to use guestunmount.  When called as:
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24        guestunmount mountpoint
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26       it unmounts "mountpoint" immediately.
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28       When called as:
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30        guestunmount --fd=FD mountpoint
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32       it waits until the pipe "FD" is closed.  This can be used to monitor
33       another process and clean up its mountpoint when that process exits, as
34       described below.
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36   FROM PROGRAMS
37       You can just call "guestunmount mountpoint" from the program, but a
38       more sophisticated way to use guestunmount is to have it monitor your
39       program so it can clean up the mount point if your program exits
40       unexpectedly.
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42       In the program, create a pipe (eg. by calling pipe(2)).  Let "FD" be
43       the file descriptor number of the read side of the pipe (ie.
44       "pipefd[0]").
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46       After mounting the filesystem with guestmount(1) (on "mountpoint"),
47       fork and run guestunmount like this:
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49        guestunmount --fd=FD mountpoint
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51       Close the read side of the pipe in the parent process.
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53       Now, when the write side of the pipe (ie. "pipefd[1]") is closed for
54       any reason, either explicitly or because the parent process exits,
55       guestunmount notices and unmounts the mountpoint.
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57       If your operating system supports it, you should set the "FD_CLOEXEC"
58       flag on the write side of the pipe.  This is so that other child
59       processes don't inherit the file descriptor and keep it open.
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61       Guestunmount never daemonizes itself.
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63   FROM SHELL SCRIPTS
64       Since bash doesn't provide a way to create an unnamed pipe, use a trap
65       to call guestunmount on exit like this:
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67        trap "guestunmount mountpoint" EXIT INT QUIT TERM
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OPTIONS

70       --fd=FD
71           Specify the pipe file descriptor to monitor, and delay cleanup
72           until that pipe is closed.
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74       --help
75           Display brief help and exit.
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77       -q
78       --quiet
79           Don’t display error messages from fusermount.  The return status is
80           still set (see "EXIT STATUS" below).
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82       --no-retry
83       --retry=N
84           By default, guestunmount will retry the fusermount operation up to
85           5 times (that is, it will run it up to 6 times = 1 try +
86           5 retries).
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88           Use --no-retry to make guestunmount run fusermount only once.
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90           Use --retry=N to make guestunmount retry "N" times instead of 5.
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92           guestunmount performs an exponential back-off between retries,
93           waiting 1 second, 2 seconds, 4 seconds, etc before each retry.
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95       -V
96       --version
97           Display the program version and exit.
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ENVIRONMENT VARIABLES

100       "PATH"
101           The fusermount(1) program (supplied by FUSE) must be available on
102           the current "PATH".
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EXIT STATUS

105       This program returns 0 if successful, or one of the following error
106       codes:
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108       1   Program error, eg. could not allocate memory, could not run
109           fusermount.  See the error message printed for more information.
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111       2   The mount point could not be unmounted even after retrying.  See
112           the error message printed for the underlying fusermount error.
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114       3   The mount point is not mounted.
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AUTHORS

121       Richard W.M. Jones ("rjones at redhat dot com")
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COPYRIGHT

124       Copyright (C) 2013 Red Hat Inc.
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LICENSE

127       This program is free software; you can redistribute it and/or modify it
128       under the terms of the GNU General Public License as published by the
129       Free Software Foundation; either version 2 of the License, or (at your
130       option) any later version.
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132       This program is distributed in the hope that it will be useful, but
133       WITHOUT ANY WARRANTY; without even the implied warranty of
134       MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
135       General Public License for more details.
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137       You should have received a copy of the GNU General Public License along
138       with this program; if not, write to the Free Software Foundation, Inc.,
139       51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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BUGS

142       To get a list of bugs against libguestfs, use this link:
143       https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools
144
145       To report a new bug against libguestfs, use this link:
146       https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools
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148       When reporting a bug, please supply:
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150       ·   The version of libguestfs.
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152       ·   Where you got libguestfs (eg. which Linux distro, compiled from
153           source, etc)
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155       ·   Describe the bug accurately and give a way to reproduce it.
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157       ·   Run libguestfs-test-tool(1) and paste the complete, unedited output
158           into the bug report.
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162libguestfs-1.42.0                 2020-03-09                   guestunmount(1)