diff options
Diffstat (limited to 'guix/git-download.scm')
| -rw-r--r-- | guix/git-download.scm | 95 |
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)))))) |