13

I currently do in a shellscript very inefficiently:

cp -a $MYPATH /tmp/$VERSION
cd /tmp
tar cjf archive.tar.bz2 $VERSION

I want everything to be contained in the directory called $VERSION - is there a way to do this without having to copy everything as in the above script?

migrated from stackoverflow.com May 14 '13 at 17:17

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  • Why copying it in the first place? Why not tar cjf archive.tar.bz2 $MYPATH? – Chewie May 14 '13 at 12:37
  • 1
    @Chewie he said, he want the $version as parent dir in archive. – Kent May 14 '13 at 12:39
  • Oh, I see it now. – Chewie May 14 '13 at 12:45
22

The GNU version of tar supports the --transform option (and its alias --xform), you could use it like this

tar --transform "s/^$MYPATH/$VERSION/" -cf archive.tar.bz2 "$MYPATH"

For example, given this directory tree

foo
└── foo.txt

the command

tar --transform "s/^foo/bar/" -cf foo.tar.bz2 foo

will produce an archive like

$ tar -tf foo.tar.bz2
bar/
bar/foo.txt
  • 3
    It is noteworthy that this approach might break symbolic links. Prepending flags=r; solves the problem as mentioned in stackoverflow.com/a/29661783/388803. – eregon Aug 15 '17 at 15:35
  • don't include a trailing slash; when I put a trailing slash in the transform, the original prefix is missed; eg s/^a\//b\//, the tar -t still shows a/ while all other files are under b/; I assume this is hazardous, and I don't really need to protect against some other file with the same prefix that isn't a directory in the tar file; so no trailing slash is fine, I woudln't mind knowing the best way to handle the case of a/ being transformed but not aa/ if it were a sibling of the root node. – ThorSummoner Aug 20 '18 at 23:42
14

To tar the current directory and add a prefix, this worked for me:

tar --transform 's,^\.,$VERSION,' -cf foo.tar .
0

If you can get away without preserving symbolic links within the file tree you're tarring, you could do

ln -s $MYPATH /tmp/$VERSION
cd /tmp
tar cjhf archive.tar.bz2 $VERSION

The h option means dereference symlinks, i.e. include the file or directory that the link points to rather than simply recording the fact that there was a symlink and what it pointed to.

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