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git authenticate: Record introduction and keyring in ‘.git/config’.
* guix/scripts/git/authenticate.scm (%default-options): Remove ‘keyring-reference’. (config-value, configured-introduction, configured-keyring-reference) (configured?, record-configuration, current-branch): New procedures. (guix-git-authenticate)[missing-arguments]: New procedure. Use ‘configured-introduction’ when zero arguments are given. Use ‘configured-keyring-reference’ when ‘-k’ is not passed. Add call to ‘record-configuration’. * doc/guix.texi (Invoking guix git authenticate): Document it. Change-Id: I66e111a83f50407b52da71662629947f83a78bbc
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Ludovic Courtès
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3 changed files with 150 additions and 34 deletions
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@ -7314,6 +7314,8 @@ for Fortran development. For other languages, please use
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@section Invoking @command{guix git authenticate}
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@cindex @command{guix git authenticate}
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@cindex authentication, of Git checkouts
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@cindex Git checkout authentication
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The @command{guix git authenticate} command authenticates a Git checkout
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following the same rule as for channels (@pxref{channel-authentication,
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@ -7333,13 +7335,35 @@ The general syntax is:
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guix git authenticate @var{commit} @var{signer} [@var{options}@dots{}]
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@end example
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@cindex introduction, for Git authentication
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By default, this command authenticates the Git checkout in the current
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directory; it outputs nothing and exits with exit code zero on success
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and non-zero on failure. @var{commit} above denotes the first commit
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where authentication takes place, and @var{signer} is the OpenPGP
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fingerprint of public key used to sign @var{commit}. Together, they
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form a ``channel introduction'' (@pxref{channel-authentication, channel
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introduction}). The options below allow you to fine-tune the process.
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form a @dfn{channel introduction} (@pxref{channel-authentication, channel
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introduction}). On your first successful run, the introduction is
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recorded in the @file{.git/config} file of your checkout, allowing you
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to omit them from subsequent invocations:
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@example
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guix git authenticate [@var{options}@dots{}]
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@end example
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Should you have branches that require different introductions, you can
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specify them directly in @file{.git/config}. For example, if the branch
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called @code{personal-fork} has a different introduction than other
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branches, you can extend @file{.git/config} along these lines:
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@smallexample
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[guix "authentication-personal-fork"]
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introduction-commit = cabba936fd807b096b48283debdcddccfea3900d
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introduction-signer = C0FF EECA BBA9 E6A8 0D1D E643 A2A0 6DF2 A33A 54FA
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keyring = keyring
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@end smallexample
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The command-line options described below allow you to fine-tune the
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process.
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@table @code
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@item --repository=@var{directory}
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@ -31,6 +31,7 @@ (define-module (guix scripts git authenticate)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-37)
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#:use-module (srfi srfi-71)
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#:use-module (ice-9 format)
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#:use-module (ice-9 match)
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#:export (guix-git-authenticate))
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@ -73,8 +74,79 @@ (define %options
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(alist-cons 'show-stats? #t result)))))
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(define %default-options
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'((directory . ".")
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(keyring-reference . "keyring")))
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'((directory . ".")))
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(define (current-branch repository)
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"Return the name of the checked out branch of REPOSITORY or #f if it could
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not be determined."
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(and (not (repository-head-detached? repository))
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(let* ((head (repository-head repository))
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(name (reference-name head)))
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(and (string-prefix? "refs/heads/" name)
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(string-drop name (string-length "refs/heads/"))))))
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(define (config-value repository key)
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"Return the config value associated with KEY in the 'guix.authentication' or
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'guix.authentication-BRANCH' name space in REPOSITORY, or #f if no such config
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was found."
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(let-syntax ((false-if-git-error
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(syntax-rules ()
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((_ exp)
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(catch 'git-error (lambda () exp) (const #f))))))
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(let* ((config (repository-config repository))
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(branch (current-branch repository)))
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;; First try the BRANCH-specific value, then the generic one.`
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(or (and branch
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(false-if-git-error
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(config-entry-value
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(config-get-entry config
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(string-append "guix.authentication-"
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branch "." key)))))
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(false-if-git-error
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(config-entry-value
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(config-get-entry config
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(string-append "guix.authentication."
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key))))))))
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(define (configured-introduction repository)
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"Return two values: the commit and signer fingerprint (strings) as
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configured in REPOSITORY. Error out if one or both were missing."
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(let* ((commit (config-value repository "introduction-commit"))
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(signer (config-value repository "introduction-signer")))
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(unless (and commit signer)
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(leave (G_ "unknown introductory commit and signer~%")))
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(values commit signer)))
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(define (configured-keyring-reference repository)
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"Return the keyring reference configured in REPOSITORY or #f if missing."
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(config-value repository "keyring"))
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(define (configured? repository)
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"Return true if REPOSITORY already container introduction info in its
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'config' file."
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(and (config-value repository "introduction-commit")
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(config-value repository "introduction-signer")))
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(define* (record-configuration repository
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#:key commit signer keyring-reference)
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"Record COMMIT, SIGNER, and KEYRING-REFERENCE in the 'config' file of
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REPOSITORY."
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(define config
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(repository-config repository))
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;; Guile-Git < 0.7.0 lacks 'set-config-string'.
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(if (module-defined? (resolve-interface '(git)) 'set-config-string)
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(begin
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(set-config-string config "guix.authentication.introduction-commit"
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commit)
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(set-config-string config "guix.authentication.introduction-signer"
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signer)
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(set-config-string config "guix.authentication.keyring"
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keyring-reference)
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(info (G_ "introduction and keyring recorded \
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in repository configuration file~%")))
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(warning (G_ "could not record introduction and keyring configuration\
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(Guile-Git too old?)~%"))))
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(define (show-stats stats)
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"Display STATS, an alist containing commit signing stats as returned by
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@ -158,35 +230,48 @@ (define (make-reporter start-commit end-commit commits)
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(progress-reporter/bar (length commits))
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progress-reporter/silent))
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(define (missing-arguments)
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(leave (G_ "wrong number of arguments; \
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expected COMMIT and SIGNER~%")))
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(with-error-handling
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(with-git-error-handling
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(match (command-line-arguments options)
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((commit signer)
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(let* ((directory (assoc-ref options 'directory))
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(show-stats? (assoc-ref options 'show-stats?))
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(keyring (assoc-ref options 'keyring-reference))
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(repository (repository-open directory))
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(end (match (assoc-ref options 'end-commit)
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(#f (reference-target
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(repository-head repository)))
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(oid oid)))
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(history (match (assoc-ref options 'historical-authorizations)
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(#f '())
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(file (call-with-input-file file
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read-authorizations))))
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(cache-key (or (assoc-ref options 'cache-key)
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(repository-cache-key repository))))
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(define stats
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(authenticate-repository repository (string->oid commit)
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(openpgp-fingerprint* signer)
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#:end end
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#:keyring-reference keyring
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#:historical-authorizations history
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#:cache-key cache-key
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#:make-reporter make-reporter))
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(let* ((directory (assoc-ref options 'directory))
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(show-stats? (assoc-ref options 'show-stats?))
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(repository (repository-open directory))
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(commit signer (match (command-line-arguments options)
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((commit signer)
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(values commit signer))
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(()
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(configured-introduction repository))
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(_
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(missing-arguments))))
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(keyring (or (assoc-ref options 'keyring-reference)
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(configured-keyring-reference repository)
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"keyring"))
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(end (match (assoc-ref options 'end-commit)
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(#f (reference-target
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(repository-head repository)))
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(oid oid)))
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(history (match (assoc-ref options 'historical-authorizations)
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(#f '())
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(file (call-with-input-file file
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read-authorizations))))
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(cache-key (or (assoc-ref options 'cache-key)
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(repository-cache-key repository))))
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(define stats
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(authenticate-repository repository (string->oid commit)
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(openpgp-fingerprint* signer)
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#:end end
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#:keyring-reference keyring
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#:historical-authorizations history
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#:cache-key cache-key
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#:make-reporter make-reporter))
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(when (and show-stats? (not (null? stats)))
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(show-stats stats))))
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(_
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(leave (G_ "wrong number of arguments; \
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expected COMMIT and SIGNER~%")))))))
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(unless (configured? repository)
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(record-configuration repository
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#:commit commit #:signer signer
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#:keyring-reference keyring))
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(when (and show-stats? (not (null? stats)))
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(show-stats stats))))))
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@ -1,5 +1,5 @@
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# GNU Guix --- Functional package management for GNU
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# Copyright © 2020, 2022 Ludovic Courtès <ludo@gnu.org>
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# Copyright © 2020, 2022, 2024 Ludovic Courtès <ludo@gnu.org>
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#
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# This file is part of GNU Guix.
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#
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@ -46,6 +46,13 @@ guix git authenticate "$intro_commit" "$intro_signer" \
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--cache-key="$cache_key" --stats \
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--end="$v1_2_0_commit"
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# Check a commit that came soon after v1.2.0. No need to repeat $intro_commit
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# and $intro_signer because it should have been recorded in '.git/config'.
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after_v1_2_0="be4d9527b55b6829e33a6e0727496af25927a786"
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guix git authenticate \
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--cache-key="$cache_key" --stats \
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--end="$v1_2_0_commit"
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rm "$XDG_CACHE_HOME/guix/authentication/$cache_key"
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# Commit and signer of the 'v1.0.0' tag.
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