[PATCH for-4.8] git: Add metadata to the result of `git archive`

[Andrew Cooper <andrew.cooper3@citrix.com>]

When building Xen from a source tarball, commit information is usually lost,
especially if the tarball was generated from a tag.

Have `git archive` automatically fill in metadata at the point of creating the
archive, which is especially useful when using web snapshot links such as:

  http://xenbits.xen.org/gitweb/?p=xen.git;a=snapshot;h=HEAD;sf=tgz

to obtain the tarball.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: George Dunlap <George.Dunlap@eu.citrix.com>
CC: Ian Jackson <ian.jackson@eu.citrix.com>
CC: Jan Beulich <JBeulich@suse.com>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Tim Deegan <tim@xen.org>
CC: Wei Liu <wei.liu2@citrix.com>

It would be useful if this could be included in 4.8, and backported to older
releases  (Assuming noone has any objections)
---
 .gitarchive-info | 2 ++
 .gitattributes   | 1 +
 2 files changed, 3 insertions(+)
 create mode 100644 .gitarchive-info
 create mode 100644 .gitattributes

diff --git a/.gitarchive-info b/.gitarchive-info
new file mode 100644
index 0000000..83e5b86
--- /dev/null
+++ b/.gitarchive-info
@@ -0,0 +1,2 @@
+Changeset: $Format:%H$
+Commit date: $Format:%cD$
diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..f7bf506
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1 @@
+.gitarchive-info export-subst
-- 
2.1.4


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