tree fe7a1954c437e62ebe0a5bb7f0f82ff8fb70c114
parent e02a7141f83326f7098800fed764061ecf1f0eff
author brian m. carlson <sandals@crustytoothpaste.net> 1582402662 +0000
committer Junio C Hamano <gitster@pobox.com> 1582565610 -0800

commit: use expected signature header for SHA-256

The transition plan anticipates that we will allow signatures using
multiple algorithms in a single commit. In order to do so, we need to
use a different header per algorithm so that it will be obvious over
which data to compute the signature.

The transition plan specifies that we should use "gpgsig-sha256", so
wire up the commit code such that it can write and parse the current
algorithm, and it can remove the headers for any algorithm when creating
a new commit. Add tests to ensure that we write using the right header
and that git fsck doesn't reject these commits.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>