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Correct a few minor mis-statements (libarchive does support reading

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GNU tar sparse files, people have extended cpio) and clarify an
important detail about pax format (that ustar-compliant archivers
can mostly read pax archives correctly).

MFC after: 7 days
This commit is contained in:
Tim Kientzle 2005-08-02 03:10:52 +00:00
parent 5d596ecb25
commit a2e467d35a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=148633
1 changed files with 6 additions and 5 deletions
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11
lib/libarchive/libarchive-formats.5
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@ -72,7 +72,7 @@ The
library can read GNU-format tar archives. library can read GNU-format tar archives.
It currently supports the most popular GNU extensions, including It currently supports the most popular GNU extensions, including
modern long filename and linkname support, as well as atime and ctime data. modern long filename and linkname support, as well as atime and ctime data.
The libarchive library does not support sparse files, multi-volume The libarchive library does not support multi-volume
archives, nor the old GNU long filename format. archives, nor the old GNU long filename format.
.It Cm pax .It Cm pax
The The
@ -105,6 +105,11 @@ ustar data (user name, group name, UID, GID, etc) cannot be fully
represented in the ustar header. represented in the ustar header.
In all cases, the result can be dearchived by any program that In all cases, the result can be dearchived by any program that
can read POSIX-compliant pax interchange format archives. can read POSIX-compliant pax interchange format archives.
Programs that correctly read ustar format (see below) will also be
able to read this format; any extended attributes will be extracted as
separate files stored in
.Pn PaxHeader
directories.
.It Cm ustar .It Cm ustar
The libarchive library can both read and write this format. The libarchive library can both read and write this format.
This format has the following limitations: This format has the following limitations:
@ -188,10 +193,6 @@ limit for most other fields makes it unsuitable for modern systems.
In addition, cpio formats only store numeric UID/GID values (not In addition, cpio formats only store numeric UID/GID values (not
usernames and group names), which can make it very difficult to correctly usernames and group names), which can make it very difficult to correctly
transfer archives across systems. transfer archives across systems.
Finally, there is no good way to extend the format, which means that
ACLs, file flags, character encoding information, and non-standard file
types can not be added except by breaking compatibility with existing
implementations.
.Ss Shar Formats .Ss Shar Formats
A A
.Dq shell archive .Dq shell archive