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UNIX for Dummies Questions & Answers
tar symlinks: relative vs absolute
Post 302345957 by TreeMan on Thursday 20th of August 2009 05:18:07 PM
08-20-2009
tar symlinks: relative vs absolute
I create the tar file from / like so:
tar cEhf name.tar usr/us
And this creates the tar with the links intact. The problem is that this tar is going to be used for testing, so we want the links to point to the files in the tar. But when I extract the tar into /tmp, I get /tmp/usr/us/... as I expect, but the links are NOT /tmp/usr/us/... like I want but are /usr/us/...; the original location.
Is there a way to get the links to be relative the same way the rest of the files are?
System is Solaris 10 and I have been using tar xvf to extract. I'm hoping the problem is in the extraction since it will take several hours to rebuild a pristine system to redo the tar files if that's where the change needs to be made.
Oh, and finally, the links are important to what we are testing, so replacing the link with just a copy of what the link points to will not satisfy the conditions of the test.
Thanks.
tar cEhf name.tar usr/us
And this creates the tar with the links intact. The problem is that this tar is going to be used for testing, so we want the links to point to the files in the tar. But when I extract the tar into /tmp, I get /tmp/usr/us/... as I expect, but the links are NOT /tmp/usr/us/... like I want but are /usr/us/...; the original location.
Is there a way to get the links to be relative the same way the rest of the files are?
System is Solaris 10 and I have been using tar xvf to extract. I'm hoping the problem is in the extraction since it will take several hours to rebuild a pristine system to redo the tar files if that's where the change needs to be made.
Oh, and finally, the links are important to what we are testing, so replacing the link with just a copy of what the link points to will not satisfy the conditions of the test.
Thanks.
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LEARN ABOUT SUNOS
chroot
chroot(1M) System Administration Commands chroot(1M) NAME
chroot - change root directory for a command SYNOPSIS
/usr/sbin/chroot newroot command DESCRIPTION
The chroot utility causes command to be executed relative to newroot. The meaning of any initial slashes (/) in the path names is changed to newroot for command and any of its child processes. Upon execution, the initial working directory is newroot. Notice that redirecting the output of command to a file, chroot newroot command >x will create the file x relative to the original root of command, not the new one. The new root path name is always relative to the current root. Even if a chroot is currently in effect, the newroot argument is relative to the current root of the running process. This command can be run only by the super-user. RETURN VALUES
The exit status of chroot is the return value of command. EXAMPLES
Example 1: Using the chroot Utility The chroot utility provides an easy way to extract tar files (see tar(1)) written with absolute filenames to a different location. It is necessary to copy the shared libraries used by tar (see ldd(1)) to the newroot filesystem. example# mkdir /tmp/lib; cd /lib example# cp ld.so.1 libc.so.1 libcmd.so.1 libdl.so.1 libsec.so.1 /tmp/lib example# cp /usr/bin/tar /tmp example# dd if=/dev/rmt/0 | chroot /tmp tar xvf - ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
cd(1), tar(1), chroot(2), ttyname(3C), attributes(5) NOTES
Exercise extreme caution when referencing device files in the new root file system. References by routines such as ttyname(3C) to stdin, stdout, and stderr will find that the device associated with the file descriptor is unknown after chroot is run. SunOS 5.10 15 Dec 2003 chroot(1M)