[Build-common-hackers] Adding support for xz compression in upstream-tarball.mk

[Vasudev Kamath]

Hello CDBS Hackers,

I filed a bug[1] yesterday requesting to add support for tar.xz compression
in upstream-tarball.mk.

I was looking at fixing the issue myself and also fixed it by adding
tar.xz in below snippet

	case "$(cdbs_upstream_received_tarball)" in \
	    *.tar.gz)  unpack="gunzip -c";; \
	    *.tar.bz2) unpack="bunzip2 -c"; grep -q '3.0 (quilt)' debian/source/format || uncompress="bunzip2";; \
	    *.tar.xz)  unpack="xz -dc";; \
	    *.tar.Z)   unpack="uncompress -c"; uncompress="uncompress";; \
	    *.zip)     unpack="unzip -q";      uncompress="false";       untar="-d"; nopipe="true";; \
	    *.tar)     unpack="cat";           uncompress="true";; \
	    *) echo "Unknown extension for upstream tarball $(cdbs_upstream_received_tarball)"; false;; \


But I noticed that in case of repackaging the source upstream-tarball
blindly uses gzip compression. If upstream has provided source tarball
in xz compression wouldn't this be wrong thing to do? In general isn't
it nice to use the source tar in same file format as upstream gives them?


[1] http://bugs.debian.org/700321

Best Regards
-- 
Vasudev Kamath
http://copyninja.info
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