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Full Discussion: What's the best way to check file permissions before moving files if needed?
Top Forums Shell Programming and Scripting What's the best way to check file permissions before moving files if needed? Post 303036856 by Cacializ on Sunday 14th of July 2019 03:13:35 PM
Old 07-14-2019
What's the best way to check file permissions before moving files if needed?
Hello,
I would like to know if it's a good practice to check the file permissions of the contents of a directory before moving them. For example:
Code:
mv -- "$directory"/* "$directory"/.[!.]* "$directory"/..?* "$destination"

The variables $directory and $destination contain the path to an existing directory. The problem is that I don't have control of the user's directory who runs the script so, in theory, the files may not have the needed permissions to be moved, and the directory is required to be empty. What's a good way to check if every file was moved successfully?

The first thing that came to mind is to check the exit status of the command:
Code:
mv -- "$directory"/* "$directory"/.[!.]* "$directory"/..?* "$destination" || exit 1

However, this doesn't mean a file couldn't be moved, because it can also exit because of a non-existing directory entry as a result of the glob. I also thought of checking if the directory is actually empty:
Code:
for entry in "$directory"/* "$directory"/.[!.]* "$directory"/..?*
do
    if [ -e "$entry" ] || [ -L "$entry" ]
    then
        printf "A file couldn't be moved.\n" 1>&2
        exit 1
    fi
done

But I'd like to know if this check is unnecessary. I also thought about checking if every single file has the needed permissions before using the mv command, but I'm afraid that would be superfluous.
Thanks in advance.
Last edited by Cacializ; 07-14-2019 at 04:32 PM..
 

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LEARN ABOUT DEBIAN

cgconfigparser

CGCONFIGPARSER(8)						 libcgroup Manual						 CGCONFIGPARSER(8)

NAME

       cgconfigparser - setup control group file system

SYNOPSIS

       cgconfigparser [-h] [-l <filename>] [-L <directory>] [...]

OPTIONS

       -h, --help
	      Displays help.

       -l, --load=FILE
	      Parses  the  control  groups  configuration  file Sets up the control group file system defined by the configuration file and mounts
	      mount points defined by the configuration file.  The format of the file is described in cgconfig.conf. This option can be used  mul-
	      tiple times and can be mixed with -L option.

       -L, --load-directory=DIR
	      Finds  all  files in given directory and parses them in alphabetical order like they were specified by -l option. This option can be
	      used multiple times and can be mixed with -l option.

       -a <agid>:<auid>
	      defines the default owner of the rest of the defined control group's files. These users are allowed to set subsystem parameters  and
	      create subgroups.  The default value is the same as has the parent cgroup.

       -d, --dperm=mode
	      sets the default permissions of a control groups directory.  The permissions needs to be specified as octal numbers e.g.	-d 775.

       -f, --fperm=mode
	      sets  the default permissions of the control group files.  The permissions needs to be specified as octal numbers e.g.  -f 775.  The
	      value is not used as given because the current owner's permissions are used as an umask (so 777 will set group  and  others  permis-
	      sions to the owners permissions).

       -s, --tperm=mode
	      sets the default permissions of the control group tasks files.  The permissions needs to be specified as octal numbers e.g.  -f 775.
	      The value is not used as given because the current owner's permissions are used as an umask (so 777 will set group and  others  per-
	      missions to the owners permissions).

       -t <tuid>:<tgid>
	      defines  the default owner of tasks file of the defined control group. I.e. this user and members of this group have write access to
	      the file.

SEE ALSO

       cgconfig.conf (5)

Linux								    2009-03-16							 CGCONFIGPARSER(8)
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