Date: Wed, 8 Oct 2014 09:24:26 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: Jason Hellenthal <jhellenthal@dataix.net> Cc: hackers@freebsd.org, Ian Lepore <ian@FreeBSD.org> Subject: Re: tar and / Message-ID: <EF765340-81BE-4461-8DF4-5CAC4F5DDCD7@cs.huji.ac.il> In-Reply-To: <FD9D0411-6043-4AAD-8EE4-6277EFBB0900@dataix.net> References: <ED20B859-CDFF-4205-B7A9-A1A86AAAE1D9@cs.huji.ac.il> <FD9D0411-6043-4AAD-8EE4-6277EFBB0900@dataix.net>
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A facts that I did not mention: the tar file is created by ports when requesting ‘package’, it now adds /usr/local making extraction difficult for those that use nfs/amd for /usr/local (the solution is to extract the files in /var/tmp, and re-taring without the /usr/local :-) to my surprise, even though tar complains that it can’t do the link to / it actually does the link!! notice that I mentioned ‘link', not symlink! which of course brings the question why some ports insist on link, and not symlink is beyond me. thanks danny On Oct 7, 2014, at 5:35 PM, Jason Hellenthal <jhellenthal@dataix.net> wrote: > From tar(1) > > o Archive entries can exploit symbolic links to restore files to other directories. > An archive can restore a symbolic link to another directory, then use that link to > restore a file into that directory. To guard against this, tar checks each > extracted path for symlinks. If the final path element is a symlink, it will be > removed and replaced with the archive entry. If -U is specified, any intermediate > symlink will also be unconditionally removed. If neither -U nor -P is specified, > tar will refuse to extract the entry. > > With that stated you might want to roll through your filesystem with symlinks(1) [sysutils/symlinks]. Use of this to shorten, remove dangling etc.. > > DESCRIPTION > symlinks is a useful utility for maintainers of FTP sites, CDROMs, and > Linux software distributions. It scans directories for symbolic links > and lists them on stdout, often revealing flaws in the filesystem tree. > > Each link is output with a classification of relative, absolute, dan- > gling, messy, lengthy, or other_fs. > > relative links are those expressed as paths relative to the directory > in which the links reside, usually independent of the mount point of > the filesystem. > > absolute links are those given as an absolute path from the root direc- > tory as indicated by a leading slash (/). > > dangling links are those for which the target of the link does not cur- > rently exist. This commonly occurs for absolute links when a filesys- > tem is mounted at other than its customary mount point (such as when > the normal root filesystem is mounted at /mnt after booting from alter- > native media). > > messy links are links which contain unnecessary slashes or dots in the > path. These are cleaned up as well when -c is specified. > > lengthy links are links which use "../" more than necessary in the path > (eg. /bin/vi -> ../bin/vim) These are only detected when -s is speci- > fied, and are only cleaned up when -c is also specified. > > other_fs are those links whose target currently resides on a different > filesystem from where symlinks was run (most useful with -r ). > > Hope this helps. > > On Oct 7, 2014, at 1:44, Daniel Braniss <danny@cs.huji.ac.il> wrote: > >> hi,Ian Lepore <ian@FreeBSD.org> >> for security reasons tar removes the leading /, which is fine. >> so I can chadir to /var/tmp, and do an extract there. The problem arises when there >> is a file that is linked to /… >> Is there some way to drop that leading ‘/‘ too? >> >> cheers, >> >> _______________________________________________ >> freebsd-hackers@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers >> To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" > > -- > Jason Hellenthal > Mobile: +1 (616) 953-0176 > jhellenthal@DataIX.net > JJH48-ARIN >
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