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git-authenticate: Raise proper SRFI-35 conditions.

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* guix/git-authenticate.scm (&git-authentication-error)
(&unsigned-commit-error, &unauthorized-commit-error)
(&signature-verification-error, &missing-key-error): New condition
types.
(commit-signing-key, authenticate-commit): Raise them.
This commit is contained in:
Ludovic Courtès 2020-06-01 22:53:06 +02:00
parent 512b9e2da2
commit f8213f1bca
No known key found for this signature in database
GPG Key ID: 090B11993D9AEBB5
1 changed files with 42 additions and 2 deletions
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44
guix/git-authenticate.scm
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@ -41,7 +41,18 @@
authenticate-commits
load-keyring-from-reference
previously-authenticated-commits
cache-authenticated-commit))
cache-authenticated-commit
git-authentication-error?
git-authentication-error-commit
unsigned-commit-error?
unauthorized-commit-error?
unauthorized-commit-error-signing-key
signature-verification-error?
signature-verification-error-keyring
signature-verification-error-signature
missing-key-error?
missing-key-error-signature))
;;; Commentary:
;;;
@ -52,6 +63,27 @@
;;;
;;; Code:
(define-condition-type &git-authentication-error &error
git-authentication-error?
(commit git-authentication-error-commit))
(define-condition-type &unsigned-commit-error &git-authentication-error
unsigned-commit-error?)
(define-condition-type &unauthorized-commit-error &git-authentication-error
unauthorized-commit-error?
(signing-key unauthorized-commit-error-signing-key))
(define-condition-type &signature-verification-error &git-authentication-error
signature-verification-error?
(signature signature-verification-error-signature)
(keyring signature-verification-error-keyring))
(define-condition-type &missing-key-error &git-authentication-error
missing-key-error?
(signature missing-key-error-signature))
(define (commit-signing-key repo commit-id keyring)
"Return the OpenPGP key that signed COMMIT-ID (an OID). Raise an exception
if the commit is unsigned, has an invalid signature, or if its signing key is
@ -64,9 +96,10 @@ not in KEYRING."
(values #f #f)))))
(unless signature
(raise (condition
(&unsigned-commit-error (commit commit-id))
(&message
(message (format #f (G_ "commit ~a lacks a signature")
commit-id))))))
(oid->string commit-id)))))))
(let ((signature (string->openpgp-packet signature)))
(with-fluids ((%default-port-encoding "UTF-8"))
@ -77,12 +110,17 @@ not in KEYRING."
('bad-signature
;; There's a signature but it's invalid.
(raise (condition
(&signature-verification-error (commit commit-id)
(signature signature)
(keyring keyring))
(&message
(message (format #f (G_ "signature verification failed \
for commit ~a")
(oid->string commit-id)))))))
('missing-key
(raise (condition
(&missing-key-error (commit commit-id)
(signature signature))
(&message
(message (format #f (G_ "could not authenticate \
commit ~a: key ~a is missing")
@ -138,6 +176,8 @@ not specify anything, fall back to DEFAULT-AUTHORIZATIONS."
(commit-authorized-keys repository commit
default-authorizations))
(raise (condition
(&unauthorized-commit-error (commit id)
(signing-key signing-key))
(&message
(message (format #f (G_ "commit ~a not signed by an authorized \
key: ~a")