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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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LEARN ABOUT PLAN9
tar
TAR(1) General Commands Manual TAR(1) NAME
tar - archiver SYNOPSIS
tar key [ file ... ] DESCRIPTION
Tar saves and restores file trees. It is most often used to transport a tree of files from one system to another. The key is a string that contains at most one function letter plus optional modifiers. Other arguments to the command are names of files or directories to be dumped or restored. A directory name implies all the contained files and subdirectories (recursively). The function is one of the following letters: c Create a new archive with the given files as contents. x Extract the named files from the archive. If a file is a directory, the directory is extracted recursively. Modes are restored if possible. If no file argument is given, extract the entire archive. If the archive contains multiple entries for a file, the lat- est one wins. t List all occurrences of each file in the archive, or of all files if there are no file arguments. r The named files are appended to the archive. The modifiers are: v (verbose) Print the name of each file treated preceded by the function letter. With t, give more details about the archive entries. f Use the next argument as the name of the archive instead of the default standard input (for keys x and t) or standard output (for keys c and r). u Use the next (numeric) argument as the user id for files in the output archive. This is only useful when moving files to a non-Plan 9 system. g Use the next (numeric) argument as the group id for files in the output archive. EXAMPLES
Tar can be used to copy hierarchies thus: {cd fromdir; tar c .} | {cd todir; tar x} SOURCE
/sys/src/cmd/tar.c SEE ALSO
ar(1), bundle(1), tapefs(1) BUGS
There is no way to ask for any but the last occurrence of a file. File path names are limited to 100 characters. The tar format allows specification of links and symbolic links, concepts foreign to Plan 9: they are ignored. TAR(1)