git-download: Rewrite 'git-predicate' using Guile-Git.
Fixes <https://bugs.gnu.org/27925>. * guix/git-download.scm (files->directory-tree) (directory-in-tree?): Remove. (git-file-list): New procedures. (git-predicate): Use it instead of opening a pipe to 'git'. Remove directory tree hack and rely exclusively on inode/device numbers.master
Ludovic Courtès
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3763e7716c
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aed0a59405
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@ -1,5 +1,5 @@
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;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2014, 2015, 2016, 2017, 2018 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
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;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
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;;;
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@ -19,7 +19,6 @@
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix git-download)
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#:use-module (guix build utils)
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#:use-module (guix gexp)
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#:use-module (guix store)
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#:use-module (guix monads)
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@ -27,9 +26,8 @@
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#:use-module (guix packages)
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#:use-module (guix modules)
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#:autoload (guix build-system gnu) (standard-packages)
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#:use-module (git)
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#:use-module (ice-9 match)
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#:use-module (ice-9 popen)
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#:use-module (ice-9 rdelim)
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#:use-module (ice-9 vlist)
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#:use-module (srfi srfi-1)
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#:export (git-reference
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@ -153,41 +151,31 @@ HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
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;;; 'git-predicate'.
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;;;
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(define (files->directory-tree files)
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"Return a tree of vhashes representing the directory listed in FILES, a list
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like '(\"a/b\" \"b/c/d\")."
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(fold (lambda (file result)
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(let loop ((file (string-split file #\/))
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(result result))
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(match file
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((_)
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result)
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((directory children ...)
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(match (vhash-assoc directory result)
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(#f
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(vhash-cons directory (loop children vlist-null)
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result))
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((_ . previous)
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;; XXX: 'vhash-delete' is O(n).
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(vhash-cons directory (loop children previous)
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(vhash-delete directory result)))))
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(()
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result))))
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vlist-null
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files))
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(define (directory-in-tree? tree directory)
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"Return true if DIRECTORY, a string like \"a/b\", denotes a directory listed
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in TREE."
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(let loop ((directory (string-split directory #\/))
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(tree tree))
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(match directory
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(()
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#t)
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((head . tail)
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(match (vhash-assoc head tree)
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((_ . sub-tree) (loop tail sub-tree))
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(#f #f))))))
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(define (git-file-list directory)
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"Return the list of files checked in in the Git repository at DIRECTORY.
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The result is similar to that of the 'git ls-files' command, except that it
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also includes directories, not just regular files. The returned file names
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are relative to DIRECTORY, which is not necessarily the root of the checkout."
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(let* ((directory (canonicalize-path directory))
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(dot-git (repository-discover directory))
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(top (dirname dot-git))
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(repository (repository-open dot-git))
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(head (repository-head repository))
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(oid (reference-target head))
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(commit (commit-lookup repository oid))
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(tree (commit-tree commit))
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(files (tree-list tree)))
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(repository-close! repository)
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(if (string=? top directory)
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files
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(let ((relative (string-append
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(string-drop directory
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(+ 1 (string-length top)))
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"/")))
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(filter-map (lambda (file)
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(and (string-prefix? relative file)
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(string-drop file (string-length relative))))
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files)))))
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(define (git-predicate directory)
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"Return a predicate that returns true if a file is part of the Git checkout
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@ -195,43 +183,20 @@ living at DIRECTORY. Upon Git failure, return #f instead of a predicate.
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The returned predicate takes two arguments FILE and STAT where FILE is an
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absolute file name and STAT is the result of 'lstat'."
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(let* ((pipe (with-directory-excursion directory
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(open-pipe* OPEN_READ "git" "ls-files")))
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(files (let loop ((lines '()))
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(match (read-line pipe)
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((? eof-object?)
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(reverse lines))
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(line
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(loop (cons line lines))))))
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(directory-tree (files->directory-tree files))
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(inodes (fold (lambda (file result)
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(let ((stat
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(lstat (string-append directory "/"
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file))))
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(vhash-consv (stat:ino stat) (stat:dev stat)
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result)))
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vlist-null
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files))
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;; Note: For this to work we must *not* call 'canonicalize-path' on
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;; DIRECTORY or we would get discrepancies of the returned lambda is
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;; called with a non-canonical file name.
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(prefix-length (+ 1 (string-length directory)))
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(status (close-pipe pipe)))
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(and (zero? status)
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(lambda (file stat)
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(match (stat:type stat)
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('directory
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(directory-in-tree? directory-tree
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(string-drop file prefix-length)))
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((or 'regular 'symlink)
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;; Comparing file names is always tricky business so we rely on
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;; inode numbers instead
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(match (vhash-assv (stat:ino stat) inodes)
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((_ . dev) (= dev (stat:dev stat)))
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(#f #f)))
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(_
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#f))))))
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(let* ((files (git-file-list directory))
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(inodes (fold (lambda (file result)
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(let ((stat
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(lstat (string-append directory "/"
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file))))
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(vhash-consv (stat:ino stat) (stat:dev stat)
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result)))
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vlist-null
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files)))
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(lambda (file stat)
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;; Comparing file names is always tricky business so we rely on inode
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;; numbers instead.
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(match (vhash-assv (stat:ino stat) inodes)
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((_ . dev) (= dev (stat:dev stat)))
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(#f #f)))))
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;;; git-download.scm ends here
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