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author | Ludovic Courtès <ludo@gnu.org> | 2019-09-14 17:54:06 +0200 |
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committer | Ludovic Courtès <ludo@gnu.org> | 2019-09-23 10:38:43 +0200 |
commit | 873f6f1334ab06a69e768a8aea0054404237542f (patch) | |
tree | 81d0183061f1dec3c0a0fb276d9c912412c45105 /guix | |
parent | a78dcb3d599cc84b347578940bb0fd44b1ad50b4 (diff) | |
download | patches-873f6f1334ab06a69e768a8aea0054404237542f.tar patches-873f6f1334ab06a69e768a8aea0054404237542f.tar.gz |
git: Add 'commit-difference'.
* guix/git.scm (commit-closure, commit-difference): New procedures.
* guix/tests/git.scm, tests/git.scm: New files.
* Makefile.am (dist_noinst_DATA): Add guix/tests/git.scm.
(SCM_TESTS): Add tests/git.scm.
Diffstat (limited to 'guix')
-rw-r--r-- | guix/git.scm | 40 | ||||
-rw-r--r-- | guix/tests/git.scm | 97 |
2 files changed, 137 insertions, 0 deletions
diff --git a/guix/git.scm b/guix/git.scm index 92a7353b5a..d7dddde3a7 100644 --- a/guix/git.scm +++ b/guix/git.scm @@ -28,6 +28,7 @@ #:use-module (guix utils) #:use-module (guix records) #:use-module (guix gexp) + #:use-module (guix sets) #:use-module (rnrs bytevectors) #:use-module (ice-9 match) #:use-module (srfi srfi-1) @@ -37,8 +38,10 @@ #:export (%repository-cache-directory honor-system-x509-certificates! + with-repository update-cached-checkout latest-repository-commit + commit-difference git-checkout git-checkout? @@ -341,6 +344,43 @@ Log progress and checkout info to LOG-PORT." ;;; +;;; Commit difference. +;;; + +(define (commit-closure commit) + "Return the closure of COMMIT as a set." + (let loop ((commits (list commit)) + (visited (setq))) + (match commits + (() + visited) + ((head . tail) + (if (set-contains? visited head) + (loop tail visited) + (loop (append (commit-parents head) tail) + (set-insert head visited))))))) + +(define (commit-difference new old) + "Return the list of commits between NEW and OLD, where OLD is assumed to be +an ancestor of NEW. + +Essentially, this computes the set difference between the closure of NEW and +that of OLD." + (let loop ((commits (list new)) + (result '()) + (visited (commit-closure old))) + (match commits + (() + (reverse result)) + ((head . tail) + (if (set-contains? visited head) + (loop tail result visited) + (loop (append (commit-parents head) tail) + (cons head result) + (set-insert head visited))))))) + + +;;; ;;; Checkouts. ;;; diff --git a/guix/tests/git.scm b/guix/tests/git.scm new file mode 100644 index 0000000000..52abe77c83 --- /dev/null +++ b/guix/tests/git.scm @@ -0,0 +1,97 @@ +;;; GNU Guix --- Functional package management for GNU +;;; Copyright © 2019 Ludovic Courtès <ludo@gnu.org> +;;; +;;; This file is part of GNU Guix. +;;; +;;; GNU Guix is free software; you can redistribute it and/or modify it +;;; under the terms of the GNU General Public License as published by +;;; the Free Software Foundation; either version 3 of the License, or (at +;;; your option) any later version. +;;; +;;; GNU Guix 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 General Public License for more details. +;;; +;;; You should have received a copy of the GNU General Public License +;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>. + +(define-module (guix tests git) + #:use-module (git) + #:use-module (guix utils) + #:use-module (guix build utils) + #:use-module (ice-9 match) + #:use-module (ice-9 control) + #:export (git-command + with-temporary-git-repository + find-commit)) + +(define git-command + (make-parameter "git")) + +(define (populate-git-repository directory directives) + "Initialize a new Git checkout and repository in DIRECTORY and apply +DIRECTIVES. Each element of DIRECTIVES is an sexp like: + + (add \"foo.txt\" \"hi!\") + +Return DIRECTORY on success." + + ;; Note: As of version 0.2.0, Guile-Git lacks the necessary bindings to do + ;; all this, so resort to the "git" command. + (define (git command . args) + (apply invoke (git-command) "-C" directory + command args)) + + (mkdir-p directory) + (git "init") + + (let loop ((directives directives)) + (match directives + (() + directory) + ((('add file contents) rest ...) + (let ((file (string-append directory "/" file))) + (mkdir-p (dirname file)) + (call-with-output-file file + (lambda (port) + (display contents port))) + (git "add" file) + (loop rest))) + ((('commit text) rest ...) + (git "commit" "-m" text) + (loop rest)) + ((('branch name) rest ...) + (git "branch" name) + (loop rest)) + ((('checkout branch) rest ...) + (git "checkout" branch) + (loop rest)) + ((('merge branch message) rest ...) + (git "merge" branch "-m" message) + (loop rest))))) + +(define (call-with-temporary-git-repository directives proc) + (call-with-temporary-directory + (lambda (directory) + (populate-git-repository directory directives) + (proc directory)))) + +(define-syntax-rule (with-temporary-git-repository directory + directives exp ...) + "Evaluate EXP in a context where DIRECTORY contains a checkout populated as +per DIRECTIVES." + (call-with-temporary-git-repository directives + (lambda (directory) + exp ...))) + +(define (find-commit repository message) + "Return the commit in REPOSITORY whose message includes MESSAGE, a string." + (let/ec return + (fold-commits (lambda (commit _) + (and (string-contains (commit-message commit) + message) + (return commit))) + #f + repository) + (error "commit not found" message))) |