[Build-common-hackers] get-orig-source target in debian/rules

[George Danchev]

Hello CDBS hackers,

	I would like to ask if it is a good idea to have some code in cdbs 
implementing the get-orig-source target which could then be included in 
debian/rules.

Rationale:

	* Since it is a common target I think it could be provided by cdbs or 
any similar package and should not be reinvented every now and then.
	* This target is optional, but providing it if possible is a good idea as 
said in Policy 4.8. 
	* Could be handy for the pkg-* projects keeping *only* their debian/ 
directories on a SCM  to get the orig-source ... just a target away.

The bad thing is that it (cdbs) should depend on some fetching tool like wget 
or probably http or ftp methods (/usr/lib/apt/methods) of apt could be used as 
downloaders to fetch the tarballs ?

Here is a sample illustrating /*not tested and probably insane*/ code.

These variables should be set in debian/rules 
( if any of these is not set we can stop ?:
# debuild expects to find orig tarball in ../
UDIR = ..
UPATH=url://host/dir
UFILE=file1.tar.gz
UFILE_ORIG=file1.orig.tar.gz
MD5TRU=af8f830baf081e3a1cf39e9299cf1b86
MD5CUR=`md5sum $(UDIR)/$(UFILE) | awk '{print $$1}'`


This target could be provided by some cdbs file and included in debian/rules:

get-orig-source:
        if [ ! -f $(UDIR)/$(UFILE_ORIG) ] ; then \
        	wget -O $(UDIR)/$(UFILE_ORIG) $(UPATH)/$(UFILE) ; \
        else \
        	echo "Upstream source tarball have been already downloaded" ; \
        fi

        if [ "$(MD5CUR)" != "$(MD5TRU)" ] ; then \
        	echo "md5sum mismatch!" ; \
        	false ; \
        else \
       		echo "md5sum is ok!" ; \
        fi


Again, I'm not sure if cdbs is the best place to provide this target, and if 
not which other package could be considered as well.


P.S. I'm not subscribed to the list, please CC me.

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