X-Git-Url: https://git.dogcows.com/gitweb?a=blobdiff_plain;f=NEWS;h=1484c555a8fafecab89d8a63bc3ffbbf0e5ceef5;hb=9447e799ab5faa6e8be43de4000e1061e0879242;hp=11d3fa0f5c84c1f71364d9b265af1a3e51034ec4;hpb=b4bcb97e386a30996d3d4df8255116fc09c1f505;p=chaz%2Ftar diff --git a/NEWS b/NEWS index 11d3fa0..1484c55 100644 --- a/NEWS +++ b/NEWS @@ -1,4 +1,4 @@ -GNU tar NEWS - User visible changes. 2010-03-28 +GNU tar NEWS - User visible changes. 2010-09-23 Please send GNU tar bug reports to @@ -11,6 +11,44 @@ time stamps to the full resolution. * Bugfixes. +** More reliable directory traversal when creating archives + +Tar now checks for inconsistencies caused when a file system is +modified while tar is creating an archive. In the new approach, tar +maintains a cache of file descriptors to directories, so it uses more +file descriptors than before, but it adjusts to system limits on +the number of file descriptors. Tar also takes more care when +a file system is modified while tar is extracting from an archive. + +The new checks are implemented via the openat and related calls +standardized by POSIX.1-2008. On an older system where these calls do +not exist or do not return useful results, tar emulates the calls at +some cost in efficiency and reliability. + +** Symbolic link attributes + +When extracting symbolic links, tar now restores attributes such as +last-modified time and link permissions, if the operating system +supports this. For example, recent versions of the Linux kernel +support setting times on symlinks, and some BSD kernels also support +symlink permissions. + +** --dereference consistency + +The --dereference (-h) option now applies to files that are copied +into or out of archives, independently of other options. For example, +if F is a symbolic link and archive.tar contains a regular-file member +also named F, "tar --overwrite -x -f archive.tar F" now overwrites F +itself, rather than the file that F points to. (To overwrite the file +that F points to, add the --dereference (-h) option.) Formerly, +--dereference was intended to apply only when using the -c option, but +the implementation was not consistent. + +Also, the --dereference option no longer affects accesses to other +files, such as archives and time stamp files. Symbolic links to these +files are always followed. Previously, the links were usually but not +always followed. + ** Spurious error diagnostics on broken pipe. When receiving SIGPIPE, tar would exit with error status and @@ -46,7 +84,12 @@ update of an archive: tar -rf archive --label 'My volume' . -This did not work in previous versions, in spite of what the docs said. +This did not work in previous versions, in spite of what the docs said. + +** --record-size and --tape-length (-L) options + +Usual size suffixes are allowed for these options. For example, +-L10k stands for a 10 kilobyte tape length. ** Fix dead loop on extracting existing symlinks with the -k option. @@ -129,7 +172,7 @@ the Epoch or a `Time reference' (see below). * Time references in --pax-option argument. Any value from the --pax-option argument that is enclosed in a pair -of curly braces represents a time reference. The string between the +of curly braces represents a time reference. The string between the braces is understood either as a textual time representation, as described in chapter 7, "Date input formats", of the Tar manual, or as a name of an existing file, starting with `/' or `.'. In the latter @@ -163,14 +206,14 @@ version 1.22 - Sergey Poznyakoff, 2009-03-05 * Support for xz compression -Tar uses xz for compression if one of the following conditions is met: +Tar uses xz for compression if one of the following conditions is met: 1. The option --xz or -J (see below) is used. 2. The xz binary is set as compressor using --use-compress-program option. 3. The file name of the archive being created ends in `.xz' and auto-compress option (-a) is used. -Xz is used for decompression if one of the following conditions is met: +Xz is used for decompression if one of the following conditions is met: 1. The option --xz or -J is used. 2. The xz binary is set as compressor using --use-compress-program option. @@ -223,7 +266,7 @@ control type of archive members affected by them. The flags are: - s Apply transformation to symbolic link targets. - - h + - h Apply transformation to hard link targets. Corresponding upper-case letters negate the meaning, so that @@ -302,7 +345,7 @@ during both creation and extraction. Tar 1.19 used them only during extraction. For a detailed description, see chapter 6.7 "Modifying File and Member -Names". +Names". * Info (end-of-volume) scripts @@ -329,8 +372,8 @@ control systems, e.g. "CVS/", ".svn/", etc. The following options now work with incremental archives as well: - --exclude-caches - --exclude-caches-all + --exclude-caches + --exclude-caches-all --exclude-tag --exclude-tag-all --exclude-tag-under @@ -341,7 +384,7 @@ Previous versions always stored absolute file names in rename records, even if -P was not used. This is fixed: rename records contain file names processed in accordance with the command line settings. - + * Fix --version output. * Recognition of broken archives.