Re: [Dar-support] Misunderstanding of dar -I option

[<dar...@ca...>]

Hello Denis :-)

I am sorry -- still haven't "got" how to do even the simplest of restores
using dar (and this is a matter of concern).

What is wrong with this command (it restores the directories but not the
file)?

dar -x home --no-overwrite --alter=mask -X '*' -X '.*' \
    -g 'Shell Folders/Application Data/Microsoft/Outlook/Outlook.pst'

The output is:
 --------------------------------------------
 4 inode(s) restored
 0 inode(s) not restored (not saved in archive)
 88 inode(s) ignored (excluded by filters)
 0 inode(s) less recent than the one on filesystem
 0 inode(s) failed to restore (filesystem error)
 0 inode(s) deleted
 --------------------------------------------
 Total number of inodes considered: 92
 --------------------------------------------
 EA restored for 0 inode(s)
 --------------------------------------------

The file is in the archive (which has been verified using par2) as shown by:

dar -l home | grep Outlook.pst
[Saved]       [  35%]   -rwxr--r--   c  1000    455099392       Sat Dec  5
21:57:59 2009        Shell Folders/Application
Data/Microsoft/Outlook/Outlook.pst

Best

Charles

-----Original Message-----
From: Denis Corbin [mailto:dar...@fr...] 
Sent: 30 July 2009 01:28
To: need help compiling or using dar ? This mailing list is for you.
Subject: Re: [Dar-support] Misunderstanding of dar -I option

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dar...@ca... a écrit :
>  
> Sorry Denis :-)
> 
> That was wrong -- as another reading of the dar man page showed.  I now
> understand that:
> 
> * The prune option -P is used to exclude directories _and files_.  It can
be
> given glob(7) expressions.

Yes, absolutely.

> 
> * The "go into" option -g is used to do an implicit "-P * -P .*" and then
> unprune nominated directories and files.  It cannot be given glob(7)
> expressions.

No, it can. For example, you can skip all .mozilla/cache directories
found under any home directory using

	-R / -P "home/*/.mozilla/cache"

or if you prefer

	-R / -ar -P "home/.*/\.mozilla/cache"

> 
> I hope I am alone in finding the function and interaction of the -g, -I,
-X
> and -P options bewildering.  I got off to a bad start by taking -P as
> similar to the find command's -prune option and failing to realise that
the
> mask on -X is a filename global expansion so leading "."s need to be
> explicitly matched.
> 
> Thinking out loud ...

No problem. You can also take a look at -[ and -] options. They are
equivalent to -P / -g options, at the difference that they point to a
file that contains a list of entry. Each entry is static (no glob/regex
expression) and it must contain the full, absolute path (including the
root directory pointed to by -R option).

> 
> This may be a serious point; restorations are seldom well enough practiced
> and are often done under pressure at the end of a long working time.  For
a
> restore utility, "intuitively obvious" is important.
> 
> Would it be possible to have only two file selection options: a -X option
> that excluded all files and directories matched and a -I that included all
> files and directories matched, the two to work cumulatively?  -X and -I
> could be made to apply to directories by ending the mask with /; if the
mask
> ended with any other character it would be taken as a file mask.  That
would
> be intuitively obvious (to me, anyway!). 

I think you should consider -am option and the way it changes the
masking behavior, things may becomes a bit more simple and powerful at
the same time:

For example, You want to avoid backing up any file ending with "~"
except if it ends with "txt~" but you still want to exclude file
starting with "trash" even if they finish by "txt~".

With -am you just follow the order in which you speak, this gives:

	-am -X "*~" -I "*txt~" -X "trash*"

Without -am option, this statement would include any "*txt~" file that
do not match "*~" nor "trash*", thus you would have no file at all, as
any file matching "*txt~" also match "*~". Without -am the order of -X
and -I has no importance. Where from the name "ordered" mask for -am option.

> 
> Then there would be no need for the -g.  After -X '*/' to exclude
> everything, -I options would have the same functionality as the present -g
> (this would require that -X '*/' also matched the root).
> 
> There would be no need for -P.  The proposed -X does all that -P currently
> does (-X '*/<expression>' would replace the current -X '<expression>').
> 
> Best
> 
> Charles 
> 

Regards,
Denis.
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