• MorphOS Developer
    Piru
    Posts: 387 from 2003/2/24
    From: finland, the l...
    Recent tar (should be included with the SDK) includes support for amiga file attributes and comments. You need to use --xattrs option to enable the support.

    Archive directory t:foo and save it to backup:foo.tar.gz:

    Code:
    tar --xattrs -z -c -v -f backup:foo.tar.gz -C t: foo


    Extract the archice to t: restoring the amiga attributes:

    Code:
    tar --xattrs -z -x -v -f backup:foo.tar.gz -C t:


    Note that unix systems don't know how to restore the amiga file attributes or comments. Neither some old builds of tar.

    Technical notes: This support was realized by adding a fake "xattrs" layer to ixemul.library. It reports amiga attributes and comments as special xattrs. When tar is compiled against a recent MorphOS SDK, it will automatically pick up xattrs support (just ./configure and make).

    File amiga protection modes are stored in "user.amiga.mode" xattr. The data is a 32bit big endian byte order integer. The amiga file comment is stored in "user.amiga.comment" xattr. The data is ISO 8859-1 (latin1) bytes forming the file comment.

    So inclined may check the ixemul source code. The implementation is at:
    Code:
    library/listxattr.c
    library/setxattr.c
    library/removexattr.c
    library/getxattr.c
    include/sys/xattr.h


    PS. MorphOS xadmaster.library Tar slave supports these xattrs as well. The implementation is at:
    Code:
    clients/Tar.c



    PPS. (L)GPL isn't hard.

    [ Edited by Piru 27.08.2018 - 00:52 ]
  • »26.08.18 - 21:41
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