git: Add metadata to the result of git archive

Have `git archive` automatically fill in metadata at the point of creating the archive, which makes it easier to track back from released packages to the source code which was used to build them. Based on https://xenbits.xen.org/gitweb/?p=xen.git;a=commitdiff;h=bd4d31be073166fc69b131e6375b55033b83b1c0, by Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Euan Harris <euan.harris@citrix.com>
robhoes · Nov 7, 2016 · ccd5d2e · ccd5d2e
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commit ccd5d2e
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diff --git a/.gitarchive-info b/.gitarchive-info
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+Changeset: $Format:%H$
+Commit date: $Format:%cD$
diff --git a/.gitattributes b/.gitattributes
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+.gitarchive-info export-subst