On Tuesday, November 8, 2016 1:19:36 PM CET [email protected] wrote: > Hello, Pavel! Thank you very much for your answer. But this is not exactly > what do I want. > I want to extract one archive with backup of some files to existing directry > with necessary files. If archive does not contain a file, but I have it > inside existing directory, I dont want it to be removed while unpacking > archive. But if archive contains new file (here I mean that everything is > files - diretory, symbolic link, anything) - I want tar to overwrite it. > For example: > ➜ ~ mkdir -p mydir/dir-with-files > ➜ ~ ln -s /dev/null mydir/link-will-be-dir > ➜ ~ touch mydir/dir-with-files/file1 > ➜ ~ tar -cf mybackup.tar mydir/ > ➜ ~ rm -f mydir/link-will-be-dir > ➜ ~ mkdir -p mydir/link-will-be-dir > ➜ ~ touch mydir/dir-with-files/file2 > mydir/link-will-be-dir/file-should-be-deleted-after-extract-since-its-parent-dir-become-symlink > ➜ ~ tar -x --some-awesome-flag mybackup.tar > and now i want it to have: > mydir/dir-with/files contains file1 and file2 > mydir/dir-will-be-link is symbolic link to /dev/null
Looks like you want something like the '--recursive-unlink' option, but that option would overwrite the non-empty directory only if (based on archive contents) it is to be overwritten by non-directory file. That's not implemented, but I'm not sure I follow. Pavel > 01.11.2016, 11:04, "Pavel Raiskup" <[email protected]>: > On Tuesday, November 1, 2016 2:56:23 AM CET [email protected] wrote: > > Hello. > I don't know if it is a bug or something like that. > What flag should I use if I want to overwrite existing non-empty directory by > symlink from my tar archive? > > There's --recursive-unlink. But I would be careful to explicitly select > proper set of files to be extracted, rather then extract the whole archive > (there's high chance this will cause some disaster). > > Documentation: info tar -n "Recursive Unlink" > > Pavel > > > I've tried --overwrite flag and -U, that did not > work. Tried with tar version 1.29 and 1.28. Here is example: > > ➜ ln -s /dev/null test > ➜ tar -cf archive.tar test > ➜ rm -f test > ➜ mkdir -p test/something > ➜ tar --overwrite -xf archive.tar > tar: test: Cannot open: File exists > tar: Exiting with failure status due to previous errors > ➜ tar -U -xf archive.tar > tar: test: Cannot unlink: Directory not empty > tar: Exiting with failure status due to previous errors > ➜ rmdir test/something > ➜ tar --overwrite -xf archive.tar > ➜ echo $? > 0 > > >
