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;;; Guix Data Service -- Information about Guix over time
;;; Copyright © 2023 Christopher Baines <mail@cbaines.net>
;;;
;;; This program is free software: you can redistribute it and/or
;;; modify it under the terms of the GNU Affero General Public License
;;; as published by the Free Software Foundation, either version 3 of
;;; the License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Affero General Public License for more details.
;;;
;;; You should have received a copy of the GNU Affero General Public
;;; License along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (guix-data-service poll-git-repository)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-11)
#:use-module (srfi srfi-19)
#:use-module (srfi srfi-71)
#:use-module (ice-9 threads)
#:use-module (squee)
#:use-module (git)
#:use-module (guix git)
#:use-module (guix channels)
#:use-module ((guix build syscalls)
#:select (set-thread-name))
#:use-module (guix-data-service database)
#:use-module (guix-data-service model git-repository)
#:use-module (guix-data-service model git-branch)
#:use-module (guix-data-service model git-commit)
#:use-module (guix-data-service jobs load-new-guix-revision)
#:export (start-thread-to-poll-git-repository))
(define (start-thread-to-poll-git-repository git-repository-id)
(call-with-new-thread
(lambda ()
(catch 'system-error
(lambda ()
(set-thread-name
(simple-format #f "poll git ~A"
git-repository-id)))
(const #t))
(libgit2-init!)
(honor-system-x509-certificates!)
(with-postgresql-connection
(simple-format #f "poll-git-repository-~A"
git-repository-id)
(lambda (conn)
(let loop ()
(with-exception-handler
(lambda (exn)
(simple-format #t "exception when polling git repository (~A): ~A\n"
git-repository-id exn))
(lambda ()
(with-throw-handler #t
(lambda ()
(poll-git-repository conn git-repository-id))
(lambda _
(backtrace))))
#:unwind? #t)
(and=>
(fifth (select-git-repository conn git-repository-id))
(lambda (poll-interval)
(sleep poll-interval)
(loop)))))))))
(define* (just-update-cached-checkout url
#:key
(ref '())
recursive?
(cache-directory
(url-cache-directory
url (%repository-cache-directory)
#:recursive? recursive?)))
(let* ((cache-exists? (openable-repository? cache-directory))
(repository (if cache-exists?
(repository-open cache-directory)
((@@ (guix git) clone/swh-fallback)
url ref cache-directory))))
;; Only fetch remote if it has not been cloned just before.
(when cache-exists?
(remote-fetch (remote-lookup repository "origin")
#:fetch-options ((@@ (guix git) make-default-fetch-options))))
(repository-close! repository)))
(define (poll-git-repository conn git-repository-id)
(define git-repository-details
(select-git-repository conn git-repository-id))
;; Obtain a session level lock here, to avoid conflicts with other jobs over
;; the Git repository.
(with-advisory-session-lock/log-time
conn
'latest-channel-instances
(lambda ()
;; This was using update-cached-checkout, but it wants to checkout
;; refs/remotes/origin/HEAD by default, and that can fail for some reason
;; on some repositories:
;;
;; reference 'refs/remotes/origin/HEAD' not found
;;
;; I just want to update the cached checkout though, so trying to
;; checkout some revision is unnecessary, hence
;; just-update-cached-checkout
(just-update-cached-checkout (second git-repository-details))
(let* ((repository-directory
(url-cache-directory
(second git-repository-details)))
(included-branches
excluded-branches
(select-includes-and-excluded-branches-for-git-repository
conn
git-repository-id))
;; remote-ls returns remote-head's where the oid's aren't like the
;; oid's found through branches, and I'm not sure how to handle
;; them. Work around this by just using remote-ls to check what
;; branches exist on the remote.
(remote-branch-names
(with-repository repository-directory repository
(let ((remote (remote-lookup repository "origin")))
(remote-connect remote)
(filter-map
(lambda (rh)
(let ((name (remote-head-name rh)))
(if (string-prefix? "refs/heads/" name)
(string-drop name
(string-length "refs/heads/"))
#f)))
(remote-ls remote)))))
(repository-branches
(with-repository repository-directory repository
(filter-map
(lambda (branch-reference)
(let* ((branch-name
(string-drop (reference-shorthand branch-reference)
(string-length "origin/"))))
(and
;; branch-list may list branches which don't exist on the
;; remote, so use the information from remote-ls to
;; filter them out
(member branch-name remote-branch-names)
(cons
branch-name
;; TODO Not sure what the right way to do this is
(and=> (false-if-exception
(reference-target branch-reference))
oid->string)))))
(branch-list repository BRANCH-REMOTE)))))
(with-postgresql-transaction
conn
(lambda (conn)
(exec-query conn "LOCK TABLE git_commits IN EXCLUSIVE MODE")
(let* ((repository-branch-details
(all-branches-with-most-recent-commit conn
git-repository-id))
(branch-names
(filter
(lambda (branch-name)
(let ((excluded-branch?
(member branch-name excluded-branches string=?))
(included-branch?
(member branch-name included-branches string=?)))
(and (not excluded-branch?)
(or (null? included-branches)
included-branch?))))
(delete-duplicates!
(append!
(map car repository-branches)
(map car repository-branch-details))))))
(for-each
(lambda (branch-name)
(define (git-branch-entry)
(or (git-branch-for-repository-and-name
conn
git-repository-id
branch-name)
(insert-git-branch-entry
conn
git-repository-id
branch-name)))
(let ((repository-commit
(assoc-ref repository-branches branch-name))
(database-commit
(and=> (assoc-ref repository-branch-details
branch-name)
first)))
(if repository-commit
(if (and database-commit
(string=? database-commit
repository-commit))
#f ;; Nothing to do
(begin
(insert-git-commit-entry conn
(git-branch-entry)
repository-commit
(current-date 0))
(unless #f
(enqueue-load-new-guix-revision-job
conn
git-repository-id
repository-commit
"poll"))))
(if (or (not database-commit)
(string=? database-commit ""))
#f ;; Nothing to do
(insert-git-commit-entry conn
(git-branch-entry)
""
(current-date 0))))))
branch-names))))))))
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