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home: symlink-manager: Move helper procedures as top-level defines.

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* gnu/home/services/symlink-manager.scm (update-symlinks-script): Remove
'config-home', which is unused.  Move 'home-path', 'backup-dir',
'get-target-path', 'get-backup-path', 'directory?', 'empty-directory?',
'symlink-to-store?', and 'backup-file' to the top level.  Move
'create-symlinks' and 'cleanup-symlinks' to the top level as well, and
add parameters.  Adjust callers.
This commit is contained in:
Ludovic Courtès 2022-02-18 16:58:27 +01:00
parent 66bf60a4cd
commit 7a8856f540
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1 changed files with 116 additions and 124 deletions
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240
gnu/home/services/symlink-manager.scm
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@ -88,12 +88,121 @@ (define ((file-tree-traverse preordering) node)
(list (cons 'dir path))
(append-map (file-tree-traverse preordering) rest))))))
(define home-path
(getenv "HOME"))
(define backup-dir
(string-append home-path "/" (number->string (current-time))
"-guix-home-legacy-configs-backup"))
(define (get-target-path path)
(string-append home-path "/." path))
(define (get-backup-path path)
(string-append backup-dir "/." path))
(define (directory? path)
(equal? (stat:type (stat path)) 'directory))
(define (empty-directory? dir)
(equal? (scandir dir) '("." "..")))
(define (symlink-to-store? path)
(and (equal? (stat:type (lstat path)) 'symlink)
(store-file-name? (readlink path))))
(define (backup-file path)
(mkdir-p backup-dir)
(format #t (G_ "Backing up ~a...") (get-target-path path))
(mkdir-p (dirname (get-backup-path path)))
(rename-file (get-target-path path) (get-backup-path path))
(display (G_ " done\n")))
(define (cleanup-symlinks old-tree)
;; Delete from directory OLD-TREE symlinks that correspond to a
;; previous generation.
(let ((to-delete ((file-tree-traverse #f) old-tree)))
(display
(G_
"Cleaning up symlinks from previous home-environment.\n\n"))
(map
(match-lambda
(('dir . ".")
(display (G_ "Cleanup finished.\n\n")))
(('dir . path)
(if (and
(file-exists? (get-target-path path))
(directory? (get-target-path path))
(empty-directory? (get-target-path path)))
(begin
(format #t (G_ "Removing ~a...")
(get-target-path path))
(rmdir (get-target-path path))
(display (G_ " done\n")))
(format
#t
(G_ "Skipping ~a (not an empty directory)... done\n")
(get-target-path path))))
(('file . path)
(when (file-exists? (get-target-path path))
;; DO NOT remove the file if it is no longer a symlink to
;; the store, it will be backed up later during
;; create-symlinks phase.
(if (symlink-to-store? (get-target-path path))
(begin
(format #t (G_ "Removing ~a...") (get-target-path path))
(delete-file (get-target-path path))
(display (G_ " done\n")))
(format
#t
(G_ "Skipping ~a (not a symlink to store)... done\n")
(get-target-path path))))))
to-delete)))
(define (create-symlinks new-tree new-files-path)
;; Create in directory NEW-TREE symlinks to the files under
;; NEW-FILES-PATH, creating backups as needed.
(define (get-source-path path)
(readlink (string-append new-files-path "/" path)))
(let ((to-create ((file-tree-traverse #t) new-tree)))
(map
(match-lambda
(('dir . ".")
(display
(G_ "New symlinks to home-environment will be created soon.\n"))
(format
#t (G_ "All conflicting files will go to ~a.\n\n") backup-dir))
(('dir . path)
(let ((target-path (get-target-path path)))
(when (and (file-exists? target-path)
(not (directory? target-path)))
(backup-file path))
(if (file-exists? target-path)
(format
#t (G_ "Skipping ~a (directory already exists)... done\n")
target-path)
(begin
(format #t (G_ "Creating ~a...") target-path)
(mkdir target-path)
(display (G_ " done\n"))))))
(('file . path)
(when (file-exists? (get-target-path path))
(backup-file path))
(format #t (G_ "Symlinking ~a -> ~a...")
(get-target-path path) (get-source-path path))
(symlink (get-source-path path) (get-target-path path))
(display (G_ " done\n"))))
to-create)))
#$%initialize-gettext
(let* ((config-home (or (getenv "XDG_CONFIG_HOME")
(string-append (getenv "HOME") "/.config")))
(he-path (string-append (getenv "HOME") "/.guix-home"))
(let* ((he-path (string-append (getenv "HOME") "/.guix-home"))
(new-he-path (string-append he-path ".new"))
(new-home (getenv "GUIX_NEW_HOME"))
(old-home (getenv "GUIX_OLD_HOME"))
@ -103,141 +212,24 @@ (define ((file-tree-traverse preordering) node)
;; to make file-system-tree works it should be a directory.
(new-files-dir-path (string-append new-files-path "/."))
(home-path (getenv "HOME"))
(backup-dir (string-append home-path "/"
(number->string (current-time))
"-guix-home-legacy-configs-backup"))
(old-tree (if old-home
((simplify-file-tree "")
(file-system-tree
(string-append old-home "/files/.")))
#f))
(new-tree ((simplify-file-tree "")
(file-system-tree new-files-dir-path)))
(get-source-path
(lambda (path)
(readlink (string-append new-files-path "/" path))))
(get-target-path
(lambda (path)
(string-append home-path "/." path)))
(get-backup-path
(lambda (path)
(string-append backup-dir "/." path)))
(directory?
(lambda (path)
(equal? (stat:type (stat path)) 'directory)))
(empty-directory?
(lambda (dir)
(equal? (scandir dir) '("." ".."))))
(symlink-to-store?
(lambda (path)
(and
(equal? (stat:type (lstat path)) 'symlink)
(store-file-name? (readlink path)))))
(backup-file
(lambda (path)
(mkdir-p backup-dir)
(format #t (G_ "Backing up ~a...") (get-target-path path))
(mkdir-p (dirname (get-backup-path path)))
(rename-file (get-target-path path) (get-backup-path path))
(display (G_ " done\n"))))
(cleanup-symlinks
(lambda ()
(let ((to-delete ((file-tree-traverse #f) old-tree)))
(display
(G_
"Cleaning up symlinks from previous home-environment.\n\n"))
(map
(match-lambda
(('dir . ".")
(display (G_ "Cleanup finished.\n\n")))
(('dir . path)
(if (and
(file-exists? (get-target-path path))
(directory? (get-target-path path))
(empty-directory? (get-target-path path)))
(begin
(format #t (G_ "Removing ~a...")
(get-target-path path))
(rmdir (get-target-path path))
(display (G_ " done\n")))
(format
#t
(G_ "Skipping ~a (not an empty directory)... done\n")
(get-target-path path))))
(('file . path)
(when (file-exists? (get-target-path path))
;; DO NOT remove the file if it is no longer
;; a symlink to the store, it will be backed
;; up later during create-symlinks phase.
(if (symlink-to-store? (get-target-path path))
(begin
(format #t (G_ "Removing ~a...") (get-target-path path))
(delete-file (get-target-path path))
(display (G_ " done\n")))
(format
#t
(G_ "Skipping ~a (not a symlink to store)... done\n")
(get-target-path path))))))
to-delete))))
(create-symlinks
(lambda ()
(let ((to-create ((file-tree-traverse #t) new-tree)))
(map
(match-lambda
(('dir . ".")
(display
(G_ "New symlinks to home-environment will be created soon.\n"))
(format
#t (G_ "All conflicting files will go to ~a.\n\n") backup-dir))
(('dir . path)
(let ((target-path (get-target-path path)))
(when (and (file-exists? target-path)
(not (directory? target-path)))
(backup-file path))
(if (file-exists? target-path)
(format
#t (G_ "Skipping ~a (directory already exists)... done\n")
target-path)
(begin
(format #t (G_ "Creating ~a...") target-path)
(mkdir target-path)
(display (G_ " done\n"))))))
(('file . path)
(when (file-exists? (get-target-path path))
(backup-file path))
(format #t (G_ "Symlinking ~a -> ~a...")
(get-target-path path) (get-source-path path))
(symlink (get-source-path path) (get-target-path path))
(display (G_ " done\n"))))
to-create)))))
(file-system-tree new-files-dir-path))))
(when old-tree
(cleanup-symlinks))
(cleanup-symlinks old-tree))
(create-symlinks)
(create-symlinks new-tree new-files-path)
(symlink new-home new-he-path)
(rename-file new-he-path he-path)
(display (G_" done\nFinished updating symlinks.\n\n")))))))
(define (update-symlinks-gexp _)
#~(primitive-load #$(update-symlinks-script)))