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UNIX for Dummies Questions & Answers
tar symlinks: relative vs absolute
Post 302346320 by TreeMan on Friday 21st of August 2009 01:41:15 PM
08-21-2009
Thanks for the reply. I tried to do this with mixed results. If the link was farther down the path, it woked, ie:
ln -s test/test/filea.txt filea.txt
This is restored no problem. But if I have a link like so:
ln -s ../test/filea.txt filea.txt
Then even though the parent dir and it's child 'test' are in the tar, the link is replaced with an actual copy of the file, so that an ls -al will show a file there now instead of a link. This does make sense to my why it would work this way, but I need it to not work that way.
Maybe tar is the wrong answer. I really just need to be able to archive up a bunch of files under /usr and then extract them under /tmp/test and have any links in there that used to point to /usr/... now point to /tmp/test/... Is this possible? The alternative will be to make a list of the symlinks using something like 'find . -type l' and then create a script to insert the symlinks after extraction. This is a less desirable option.
Thanks again
Edit: the less desirable option won. I made a script to go in and redo the absolute links so they use the new absolute path.
ln -s test/test/filea.txt filea.txt
This is restored no problem. But if I have a link like so:
ln -s ../test/filea.txt filea.txt
Then even though the parent dir and it's child 'test' are in the tar, the link is replaced with an actual copy of the file, so that an ls -al will show a file there now instead of a link. This does make sense to my why it would work this way, but I need it to not work that way.
Maybe tar is the wrong answer. I really just need to be able to archive up a bunch of files under /usr and then extract them under /tmp/test and have any links in there that used to point to /usr/... now point to /tmp/test/... Is this possible? The alternative will be to make a list of the symlinks using something like 'find . -type l' and then create a script to insert the symlinks after extraction. This is a less desirable option.
Thanks again
Edit: the less desirable option won. I made a script to go in and redo the absolute links so they use the new absolute path.
Last edited by TreeMan; 08-21-2009 at 05:58 PM..
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DH_LINK(1) Debhelper DH_LINK(1) NAME dh_link - create symlinks in package build directories SYNOPSIS dh_link [debhelperoptions] [-A] [-Xitem] [sourcedestination...] DESCRIPTION dh_link is a debhelper program that creates symlinks in package build directories. dh_link accepts a list of pairs of source and destination files. The source files are the already existing files that will be symlinked from (called target by ln(1)). The destination files are the symlinks that will be created (called link name by ln(1)). There must be an equal number of source and destination files specified. Be sure you do specify the absolute path to both the source and destination files (unlike you would do if you were using something like ln(1)). Please note that the leading slash is optional. dh_link will generate symlinks that comply with Debian policy - absolute when policy says they should be absolute, and relative links with as short a path as possible. It will also create any subdirectories it needs to put the symlinks in. Any pre-existing destination files will be replaced with symlinks. dh_link also scans the package build tree for existing symlinks which do not conform to Debian policy, and corrects them (v4 or later). FILES debian/package.links Lists pairs of source and destination files to be symlinked. Each pair should be put on its own line, with the source and destination separated by whitespace. In each pair the source file (called target by ln(1)) comes first and is followed by the destination file (called link name by ln(1)). Thus the pairs of source and destination files in each line are give in the same order as they would be given to ln(1). In contrast to ln(1), source and destination paths must be absolute (the leading slash is optional). OPTIONS -A, --all Create any links specified by command line parameters in ALL packages acted on, not just the first. -Xitem, --exclude=item Exclude symlinks that contain item anywhere in their filename from being corrected to comply with Debian policy. source destination ... Create a file named destination as a link to a file named source. Do this in the package build directory of the first package acted on. (Or in all packages if -A is specified.) EXAMPLES dh_link usr/share/man/man1/foo.1 usr/share/man/man1/bar.1 Make bar.1 be a symlink to foo.1 dh_link var/lib/foo usr/lib/foo usr/share/man/man1/foo.1 usr/share/man/man1/bar.1 Make /usr/lib/foo/ be a link to /var/lib/foo/, and bar.1 be a symlink to the foo.1 var/lib/foo usr/lib/foo usr/share/man/man1/foo.1 usr/share/man/man1/bar.1 Same as above but as content for a debian/package.links file. SEE ALSO debhelper(7) This program is a part of debhelper. AUTHOR Joey Hess <joeyh@debian.org> 11.1.6ubuntu2 2018-05-10 DH_LINK(1)