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pristine-tar

NAME

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

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) and pristine-bz2(1) to produce the pristine gzip and bzip2 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.

For pristine-tar checkout to work, you also need to store the precise contents of the tarball in version control. To specify in which tag (or branch or other treeish object) it's stored, use the upstream parameter. 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.

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.

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, and bzip2ed 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.