04-16-2010
Silly question - how does the "mv" command work?
I know this may sound really elemental, but I'm trying to figure out if I'm correct.
I have a script that moves a file from a temp directory to (what I am calling) a pickup directory.
On another machine, I have this "other program" that scans the contents of the pickup directory for a specific file name. If the file name exists, the program goes forth and does a bunch of routines ... (really not plausible to my question)
However, I have a feeling that this "other program" is grabbing this file too soon as the "mv" hasn't successfully completed writing the files contents; perhaps just the filename.
I did a test on the "other program" and the scan looks for the said file (in a while loop) approx. 22,000 within 10 seconds (a timeout).
The size of the "moved" file varies but is averages at about 200-300 bytes.
Can someone tell me if the move command first creates the file then writes?
Thank you!
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LEARN ABOUT CENTOS
dh_movefiles
DH_MOVEFILES(1) Debhelper DH_MOVEFILES(1)
NAME
dh_movefiles - move files out of debian/tmp into subpackages
SYNOPSIS
dh_movefiles [debhelperoptions] [--sourcedir=dir] [-Xitem] [file...]
DESCRIPTION
dh_movefiles is a debhelper program that is responsible for moving files out of debian/tmp or some other directory and into other package
build directories. This may be useful if your package has a Makefile that installs everything into debian/tmp, and you need to break that
up into subpackages.
Note: dh_install is a much better program, and you are recommended to use it instead of dh_movefiles.
FILES
debian/package.files
Lists the files to be moved into a package, separated by whitespace. The filenames listed should be relative to debian/tmp/. You can
also list directory names, and the whole directory will be moved.
OPTIONS
--sourcedir=dir
Instead of moving files out of debian/tmp (the default), this option makes it move files out of some other directory. Since the entire
contents of the sourcedir is moved, specifying something like --sourcedir=/ is very unsafe, so to prevent mistakes, the sourcedir must
be a relative filename; it cannot begin with a `/'.
-Xitem, --exclude=item
Exclude files that contain item anywhere in their filename from being installed.
file ...
Lists files to move. The filenames listed should be relative to debian/tmp/. You can also list directory names, and the whole directory
will be moved. It is an error to list files here unless you use -p, -i, or -a to tell dh_movefiles which subpackage to put them in.
NOTES
Note that files are always moved out of debian/tmp by default (even if you have instructed debhelper to use a compatibility level higher
than one, which does not otherwise use debian/tmp for anything at all). The idea behind this is that the package that is being built can be
told to install into debian/tmp, and then files can be moved by dh_movefiles from that directory. Any files or directories that remain are
ignored, and get deleted by dh_clean later.
SEE ALSO
debhelper(7)
This program is a part of debhelper.
AUTHOR
Joey Hess <joeyh@debian.org>
11.1.6ubuntu2 2018-05-10 DH_MOVEFILES(1)