sdk: emit proper tag references for base URLs
authorJo-Philipp Wich <jo@mein.io>
Sun, 19 Feb 2017 19:45:11 +0000 (20:45 +0100)
committerJo-Philipp Wich <jo@mein.io>
Sun, 19 Feb 2017 19:47:49 +0000 (20:47 +0100)
Properly resolve symbolic tag names when constructing the base feed Git url
and avoid emitting "HEAD" references when building from detached commits.

Fixes #495, #501.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

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