[PATCH v5 0/6] tag: move PGP verification code to tag.c

From: Santiago Torres <santiago@nyu.edu>

v5 (this): Added helpful feedback by Eric

 * Reordering of the patches, to avoid temporal inclusion of a regression
 * Fix typos here and there.
 * Review commit messages, as some weren't representative of what the patches
   were doing anymore.
 * Updated t7030 to include Peff's suggestion, and added a helped-by line here
   as it was mostly Peff's code.
 * Updated the error-handling/printing issues that were introduced when.
   libifying the verify_tag function.
   
v4:

Thanks Eric, Jeff, and Hannes for the feedback.

 * I relocated the sigchain_push call so it comes after the error on
   gpg-interface (thanks Hannnes for catching this).
 * I updated the unit test to match the discussion on [3]. Now it generates
   the expected output of the tag on the fly for comparison. (This is just
   copy and paste from [3], but I verified that it works by breaking the
   while)
 * I split moving the code and renaming the variables into two patches so
   these are easier to review.
 * I used an adapter on builtin/tag.c instead of redefining all the fn*
   declarations everywhere. This introduces an issue with the way git tag -v
   resolves refnames though. I added a new commit to restore the previous
   behavior of git-tag. I'm not sure if I should've split this into two commits
   though.

v3: Thanks Eric, Jeff, for the feedback.

 * I separated the patch in multiple sub-patches.
 * I compared the behavior of previous git tag -v and git verify-tag 
   invocations to make sure the behavior is the same
 * I dropped the multi-line comment, as suggested.
 * I fixed the issue with the missing brackets in the while (this is 
   now detected by the test).

v2:

 * I moved the pgp-verification code to tag.c 
 * I added extra arguments so git tag -v and git verify-tag both work
   with the same function
 * Relocated the SIGPIPE handling code in verify-tag to gpg-interface

v1:
 
The verify tag function is just a thin wrapper around the verify-tag
command. We can avoid one fork call by doing the verification inside
the tag builtin instead.

This applies on v2.8.0.

Thanks! -Santiago

Santiago Torres (6):
  builtin/verify-tag.c: Ignore SIGPIPE on gpg-interface
  t7030-verify-tag: Adds validation for multiple tags
  builtin/verify-tag: change variable name for readability
  builtin/verify-tag: replace name argument with sha1
  builtin/verify-tag: move verification code to tag.c
  tag: use gpg_verify_function in tag -v call

 builtin/tag.c         |  8 +------
 builtin/verify-tag.c  | 65 +++++++++------------------------------------------
 gpg-interface.c       |  2 ++
 t/t7030-verify-tag.sh | 12 ++++++++++
 tag.c                 | 48 +++++++++++++++++++++++++++++++++++++
 tag.h                 |  1 +
 6 files changed, 75 insertions(+), 61 deletions(-)