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Full Discussion: Happy birthday Linux
Special Forums News, Links, Events and Announcements Happy birthday Linux Post 76717 by zylwyz on Thursday 30th of June 2005 05:21:47 AM
Old 06-30-2005

Yes happy birthday to Linux! Ten tumblers of beer for all hackers who are using Linux!
Smilie Smilie Smilie Smilie Smilie Smilie Smilie Smilie Smilie Smilie

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PRISTINE-TAR(1) 						   pristine-tar 						   PRISTINE-TAR(1)

pristine-tar - regenerate pristine tarballs SYNOPSIS
pristine-tar [-vdk] gendelta tarball delta pristine-tar [-vdk] gentar delta tarball pristine-tar [-vdk] [-m message] commit tarball [upstream] pristine-tar [-vdk] checkout tarball pristine-tar [-vdk] list DESCRIPTION
pristine-tar can regenerate an exact copy of a pristine upstream tarball using only a small binary delta file and the contents of the tarball, which are typically kept in an upstream branch in version control. The delta file is designed to be checked into version control along-side the upstream branch, thus allowing Debian packages to be built entirely using sources in version control, without the need to keep copies of upstream tarballs. pristine-tar supports compressed tarballs, calling out to pristine-gz(1), pristine-bz2(1), and pristine-xz(1) to produce the pristine gzip, bzip2, and xz files. COMMANDS
pristine-tar gendelta tarball delta This takes the specified upstream tarball, and generates a small binary delta file that can later be used by pristine-tar gentar to recreate the tarball. If the delta filename is "-", it is written to standard output. pristine-tar gentar delta tarball This takes the specified delta file, and the files in the current directory, which must have identical content to those in the upstream tarball, and uses these to regenerate the pristine upstream tarball. If the delta filename is "-", it is read from standard input. pristine-tar commit tarball [upstream] pristine-tar commit generates a pristine-tar delta file for the specified tarball, and commits it to version control. The pristine-tar checkout command can later be used to recreate the original tarball based only on the information stored in version control. The upstream parameter specifies the tag or branch that contains the same content that is present in the tarball. This defaults to "refs/heads/upstream", or if there's no such branch, any branch matching "upstream". The name of the tree it points to will be recorded for later use by pristine-tar checkout. Note that the content does not need to be 100% identical to the content of the tarball, but if it is not, additional space will be used in the delta file. The delta files are stored in a branch named "pristine-tar", with filenames corresponding to the input tarball, with ".delta" appended. This branch is created or updated as needed to add each new delta. pristine-tar checkout tarball This regenerates a copy of the specified tarball using information previously saved in version control by pristine-tar commit. pristine-tar list This lists tarballs that pristine-tar is able to checkout from version control. OPTIONS
-v --verbose Verbose mode, show each command that is run. -d --debug Debug mode. -k --keep Don't clean up the temporary directory on exit. -m message --message=message Use this option to specify a custom commit message to pristine-tar commit. EXAMPLES
Suppose you maintain the hello package, in a git repository. You have just created a tarball of the release, hello-1.0.tar.gz, which you will upload to a "forge" site. You want to ensure that, if the "forge" loses the tarball, you can always recreate exactly that same tarball. And you'd prefer not to keep copies of tarballs for every release, as that could use a lot of disk space when hello gets the background mp3s and user-contributed levels you are planning for version 2.0. The solution is to use pristine-tar to commit a delta file that efficiently stores enough information to reproduce the tarball later. cd hello git tag -s 1.0 pristine-tar commit ../hello-1.0.tar.gz 1.0 Remember to tell git to push both the pristine-tar branch, and your tag: git push --all --tags Now it is a year later. The worst has come to pass; the "forge" lost all its data, you deleted the tarballs to make room for bug report emails, and you want to regenerate them. Happily, the git repository is still available. git clone git://github.com/joeyh/hello.git cd hello pristine-tar checkout ../hello-1.0.tar.gz LIMITATIONS
Only tarballs, gzipped tarballs, bzip2ed tarballs, and xzed tarballs are currently supported. Currently only the git revision control system is supported by the "checkout" and "commit" commands. It's ok if the working copy is not clean or has uncommitted changes, or has changes staged in the index; none of that will be touched by "checkout" or "commit". ENVIRONMENT
TMPDIR Specifies a location to place temporary files, other than the default. AUTHOR
Joey Hess <joeyh@debian.org> Licensed under the GPL, version 2 or above. perl v5.14.2 2013-06-01 PRISTINE-TAR(1)

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