Signed-off-by: Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/technical/signature-format.txt | 56 ++++++++++++++++++++++++++++
1 file changed, 56 insertions(+)
diff --git a/Documentation/technical/signature-format.txt b/Documentation/technical/signature-format.txt
index 7afd403..c50602f 100644
--- a/Documentation/technical/signature-format.txt
+++ b/Documentation/technical/signature-format.txt
@@ -184,3 +184,59 @@ Date: Wed Jun 15 09:13:29 2016 +0000
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: D4BE 2231 1AD3 131E 5EDA 29A4 6109 2E85 B722 7189
----
+
+== Push certificates
+
+- created by: `git push --signed`
+- payload: a push certificate header followed by the push transcript
+ (see pack-protocol.txt and below)
+- embedding: append the signature to the push transcript and pass it to receive hooks
+ via the environment (see below)
+- example: push of commit `dd1416f` updating `master` on `.` from `d36de3d`,
+ resulting in push certificate object `d4169b9`:
+
+----
+certificate version 0.1
+pusher C O Mitter <committer@xxxxxxxxxxx> 1465983405 +0000
+pushee .
+nonce 1465983405-07421dc1515c6f4d76d4
+
+d36de3db9b6a83076477254a3186b721a7bfaab7 dd1416f2cd1ec85957a9520a33e9053a133a775d refs/heads/master
+-----BEGIN PGP SIGNATURE-----
+Version: GnuPG v1
+
+iEYEABECAAYFAldhIa0ACgkQE7b1Hs3eQw2pGwCgmJs98xETSDZb6rooh/X7af3V
+zWgAn08ctVNga27jRkIdhFNetJy3x8De
+=WH0m
+-----END PGP SIGNATURE-----
+----
+
+- verify with: `git verify-tag --blob [-v]`
+
+----
+gpg: Signature made Wed Jun 15 11:36:45 2016 CEST using DSA key ID CDDE430D
+gpg: Good signature from "C O Mitter <committer@xxxxxxxxxxx>"
+certificate version 0.1
+pusher C O Mitter <committer@xxxxxxxxxxx> 1465983405 +0000
+pushee .
+nonce 1465983405-07421dc1515c6f4d76d4
+
+d36de3db9b6a83076477254a3186b721a7bfaab7 dd1416f2cd1ec85957a9520a33e9053a133a775d refs/heads/master
+----
+
+- pre- and post-receive hook input:
+
+----
+d36de3db9b6a83076477254a3186b721a7bfaab7 dd1416f2cd1ec85957a9520a33e9053a133a775d refs/heads/master
+----
+
+- pre- and post-receive hook environment:
+
+----
+GIT_PUSH_CERT_NONCE_STATUS=OK
+GIT_PUSH_CERT_KEY=13B6F51ECDDE430D
+GIT_PUSH_CERT=d4169b9a3c2674458f9656796132c145bbc5ba74
+GIT_PUSH_CERT_STATUS=G
+GIT_PUSH_CERT_SIGNER=C O Mitter <committer@xxxxxxxxxxx>
+GIT_PUSH_CERT_NONCE=1465983405-07421dc1515c6f4d76d4
+----
--
2.9.0.382.g87fd384
--
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