[PATCH v2 0/9] X509 (gpgsm) commit signing support

Changes in v2:
 - removed trailing commas in array initializers and add leading space
 - replaced assert(0) with BUG in p5
 - consolidated 2 format lookups reusing get_format_data p5
 - changed from format "PGP" to "openpgp", later X509 to "x509"
 - use strcasecmp instead of strcmp for format matching
 - introduce gpg.<format>.program in p8, no gpg.programX509 anymore
 - moved t/7510 patch inbetween the two patches changing validation code
 - changed t/7510 patch to use test_config and test_must_fail

This series adds support for signing commits with gpgsm.

The first two patches are cleanups of gpg-interface, they are already close to being merged. But since they have not been pulled to next i am resending them. The following 5 patches (p3-p7) prepare for the introduction of the actual feature in patch 8. Finally patch 9 extends the testsuite to cover the new feature.

This series can be seen as a follow up of a series that appeared under the name "gpg-interface: Multiple signing tools" in april 2018 [1]. After that series was not merged i decided to get my patches ready. The original series aimed at being generic for any sort of signing tool, while this series just introduced the X509 variant of gpg. (gpgsm) I collected authors and reviewers of that first series and already put them on cc.

[1] https://public-inbox.org/git/20180409204129.43537-1-mastahyeti@gmail.com/

Henning Schild (9):
  builtin/receive-pack: use check_signature from gpg-interface
  gpg-interface: make parse_gpg_output static and remove from interface
    header
  gpg-interface: add new config to select how to sign a commit
  t/t7510: check the validation of the new config gpg.format
  gpg-interface: introduce an abstraction for multiple gpg formats
  gpg-interface: do not hardcode the key string len anymore
  gpg-interface: introduce new config to select per gpg format program
  gpg-interface: introduce new signature format "x509" using gpgsm
  gpg-interface t: extend the existing GPG tests with GPGSM

 Documentation/config.txt   |  9 +++++
 builtin/receive-pack.c     | 17 ++-------
 gpg-interface.c            | 88 ++++++++++++++++++++++++++++++++++++++--------
 gpg-interface.h            |  2 --
 t/lib-gpg.sh               |  9 ++++-
 t/lib-gpg/gpgsm-gen-key.in |  6 ++++
 t/t4202-log.sh             | 66 ++++++++++++++++++++++++++++++++++
 t/t5534-push-signed.sh     | 52 +++++++++++++++++++++++++++
 t/t7003-filter-branch.sh   | 15 ++++++++
 t/t7030-verify-tag.sh      | 47 +++++++++++++++++++++++--
 t/t7510-signed-commit.sh   | 10 ++++++
 t/t7600-merge.sh           | 31 ++++++++++++++++
 12 files changed, 317 insertions(+), 35 deletions(-)
 create mode 100644 t/lib-gpg/gpgsm-gen-key.in