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Jeremy Bobbio 13d04fe6ae New option --clamp-mtime 
The new `--clamp-mtime` option will change the behavior of `--mtime` to only
use the time specified if the file mtime is newer than the given time.
The `--clamp-mtime` option can only be used together with `--mtime`.

Typical use case is to make builds reproducible: to loose less
information, it's better to keep the original date of an archive, except for
files modified during the build process. In that case, using a reference
(and thus reproducible) timestamps for the latter is good enough. See
<https://wiki.debian.org/ReproducibleBuilds> for more information.

Patch submitted by Jeremy Bobbio and
Daniel Kahn Gillmor <dkg@fifthhorseman.net>

* doc/tar.1: Document --clamp-mtime
* doc/tar.texi: Likewise.

* src/common.h (set_mtime_option_mode): New enum
(set_mtime_option): Change type to enum set_mtime_option_mode.
(NEWER_OPTION_INITIALIZED): Rename to NEWER_OPTION_INITIALIZED.
* src/create.c (start_header): Set mtime depending on set_mtime_option.
* src/tar.c (options,parse_opt): New option --clamp-mtime
(decode_options): Initialize mtime_option

* tests/time02.at: New testcase.
* tests/Makefile.am: Add new testcase
* tests/testsuite.at: Likewise.
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