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Re: amrecover questions
2002-11-01 20:01:44
Howdy Gang,
Further news on the tar issue...it is NOT amanda (I figured as much) but
it is indeed tar...I (finally) found the documentation I was looking
for. I quote the relevant snippet below...
--incremental (-G) in conjunction with --extract (--get, -x) causes
|tar| to read the lists of directory contents previously stored in the
archive, /delete/ files in the file system that did not exist in their
directories when the archive was created, and then extract the files in
the archive.
Note "/delete/ files in the file system that did not exist in their
directories when the archive was created" is at issue here as an
incremental only has the files that have changed and therefore will
delete everything that that hasn't changed. This is unfortunate
behavior and I'm surprised I haven't come across anything in the
archives regarding this...
I'm going to look into how difficult it will be to implement the -g
option. From the little bit of the docs given I'm hoping that there may
be a way to tie it into the indexer. I'm including the relevant info
for -g below...
--listed-incremental=snapshot-file (-g snapshot-file) acts like
--incremental (-G), but when used in conjunction with --create (-c) will
also cause |tar| to use the file snapshot-file, which contains
information about the state of the file system at the time of the last
backup, to decide which files to include in the archive being created.
That file will then be updated by |tar|. If the file file does not exist
when this option is specified, |tar| will create it, and include all
appropriate files in the archive.
The file file, which is archive independent, contains the date it was
last modified and a list of devices, inode numbers and directory names.
|tar| will archive files with newer mod dates or inode change times, and
directories with an unchanged inode number and device but a changed
directory name. The file is updated after the files to be archived are
determined, but before the new archive is actually created.
Developer input would be a great help about now as this may be beyond my
meager C skills (although with a little help I may be able to do it).
=G=
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