[tbb-bugs] #16956 [Tor Browser]: Make the error more explicit when tor browser version cannot be extracted from git tags

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#16956: Make the error more explicit when tor browser version cannot be extracted
from git tags
---------------------------+-----------------------------------------------
     Reporter:  boklm      |      Owner:  boklm
         Type:             |     Status:  needs_review
  enhancement              |  Milestone:
     Priority:  normal     |    Version:
    Component:  Tor        |   Keywords:  TorBrowserTeam201509R, tbb-gitian
  Browser                  |  Parent ID:
   Resolution:             |
Actual Points:             |
       Points:             |
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Comment (by boklm):

 With this patch, we now have an error like this when no version tag is
 found (I added a build-beta rule to test this, as we currently don't have
 beta tags):
 {{{
 $ make build-beta
 ./mkbundle-linux.sh versions.beta
 Could not find TORBROWSER version from tags. Does your git repo have tags
 ?
 Makefile:32: recipe for target 'build-beta' failed
 make: *** [build-beta] Error 1
 }}}

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16956#comment:2>
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