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-rw-r--r--guix/git-download.scm95
1 files changed, 68 insertions, 27 deletions
diff --git a/guix/git-download.scm b/guix/git-download.scm
index 316835502c..5019a3e62f 100644
--- a/guix/git-download.scm
+++ b/guix/git-download.scm
@@ -1,6 +1,7 @@
;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2014, 2015, 2016 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2014, 2015, 2016, 2017 Ludovic Courtès <ludo@gnu.org>
;;; Copyright © 2017 Mathieu Lirzin <mthl@gnu.org>
+;;; Copyright © 2017 Christopher Baines <mail@cbaines.net>
;;;
;;; This file is part of GNU Guix.
;;;
@@ -28,6 +29,7 @@
#:use-module (ice-9 match)
#:use-module (ice-9 popen)
#:use-module (ice-9 rdelim)
+ #:use-module (ice-9 vlist)
#:use-module (srfi srfi-1)
#:export (git-reference
git-reference?
@@ -125,45 +127,84 @@ HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f."
"Return the file-name for packages using git-download."
(string-append name "-" version "-checkout"))
+
+;;;
+;;; 'git-predicate'.
+;;;
+
+(define (files->directory-tree files)
+ "Return a tree of vhashes representing the directory listed in FILES, a list
+like '(\"a/b\" \"b/c/d\")."
+ (fold (lambda (file result)
+ (let loop ((file (string-split file #\/))
+ (result result))
+ (match file
+ ((_)
+ result)
+ ((directory children ...)
+ (match (vhash-assoc directory result)
+ (#f
+ (vhash-cons directory (loop children vlist-null)
+ result))
+ ((_ . previous)
+ ;; XXX: 'vhash-delete' is O(n).
+ (vhash-cons directory (loop children previous)
+ (vhash-delete directory result)))))
+ (()
+ result))))
+ vlist-null
+ files))
+
+(define (directory-in-tree? tree directory)
+ "Return true if DIRECTORY, a string like \"a/b\", denotes a directory listed
+in TREE."
+ (let loop ((directory (string-split directory #\/))
+ (tree tree))
+ (match directory
+ (()
+ #t)
+ ((head . tail)
+ (match (vhash-assoc head tree)
+ ((_ . sub-tree) (loop tail sub-tree))
+ (#f #f))))))
+
(define (git-predicate directory)
"Return a predicate that returns true if a file is part of the Git checkout
living at DIRECTORY. Upon Git failure, return #f instead of a predicate.
The returned predicate takes two arguments FILE and STAT where FILE is an
absolute file name and STAT is the result of 'lstat'."
- (define (parent-directory? thing directory)
- ;; Return #t if DIRECTORY is the parent of THING.
- (or (string-suffix? thing directory)
- (and (string-index thing #\/)
- (parent-directory? (dirname thing) directory))))
-
- (let* ((pipe (with-directory-excursion directory
- (open-pipe* OPEN_READ "git" "ls-files")))
- (files (let loop ((lines '()))
- (match (read-line pipe)
- ((? eof-object?)
- (reverse lines))
- (line
- (loop (cons line lines))))))
- (inodes (map (lambda (file)
- (let ((stat (lstat
- (string-append directory "/" file))))
- (cons (stat:dev stat) (stat:ino stat))))
- files))
- (status (close-pipe pipe)))
+ (let* ((pipe (with-directory-excursion directory
+ (open-pipe* OPEN_READ "git" "ls-files")))
+ (files (let loop ((lines '()))
+ (match (read-line pipe)
+ ((? eof-object?)
+ (reverse lines))
+ (line
+ (loop (cons line lines))))))
+ (directory-tree (files->directory-tree files))
+ (inodes (fold (lambda (file result)
+ (let ((stat
+ (lstat (string-append directory "/"
+ file))))
+ (vhash-consv (stat:ino stat) (stat:dev stat)
+ result)))
+ vlist-null
+ files))
+ (prefix-length (+ 1 (string-length (canonicalize-path directory))))
+ (status (close-pipe pipe)))
(and (zero? status)
(lambda (file stat)
(match (stat:type stat)
('directory
- ;; 'git ls-files' does not list directories, only regular files,
- ;; so we need this special trick.
- (any (lambda (f) (parent-directory? f file))
- files))
+ (directory-in-tree? directory-tree
+ (string-drop file prefix-length)))
((or 'regular 'symlink)
;; Comparing file names is always tricky business so we rely on
;; inode numbers instead
- (member (cons (stat:dev stat) (stat:ino stat))
- inodes))
+ (match (vhash-assv (stat:ino stat) inodes)
+ ((_ . dev) (= dev (stat:dev stat)))
+ (#f #f)))
(_
#f))))))