[PATCH for-4.14 RFC] docs/support-matrix: Gross bodge to unbreak docs rendering

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

The cronjob which renders https://xenbits.xen.org/docs/ has been broken for a
while.  commitish_version() pulls an old version of xen/Makefile out of
history, and uses the xenversion rule.

Currently, this fails with:

  tmp.support-matrix.xen.make:130: scripts/Kbuild.include: No such file or 
directory

which is because the Makefile legitimately references Kbuild.include with a
relative rather than absolute path.

Rearrange $CWD of the make rune to be in xen/

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: George Dunlap <George.Dunlap@xxxxxxxxxxxxx>
CC: Ian Jackson <ian.jackson@xxxxxxxxxx>
CC: Jan Beulich <JBeulich@xxxxxxxx>
CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Julien Grall <julien@xxxxxxx>
CC: Anthony PERARD <anthony.perard@xxxxxxxxxx>
CC: Paul Durrant <paul@xxxxxxx>

This is obviously not a proper fix.  It will break in an unfixable way if we
ever delete a file from the xen/ build system.

I don't think pulling a makefile out of history and expecting it to work in
the current working tree is a reasonable expectation.
---
 docs/support-matrix-generate | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/support-matrix-generate b/docs/support-matrix-generate
index a3d93321f1..2a1c3fad57 100755
--- a/docs/support-matrix-generate
+++ b/docs/support-matrix-generate
@@ -102,8 +102,8 @@ commitish_version () {
     esac
 
     git cat-file blob "$commitish:$versionfile" >"$tmp_versionfile"
-    version=$(make --no-print-directory -C docs \
-                   -f "${tmp_versionfile#docs/}" xenversion)
+    version=$(make --no-print-directory -C xen \
+                   -f "../${tmp_versionfile}" xenversion)
     case "$version" in
         *.*.*) version="${version%.*}" ;;
     esac
-- 
2.11.0