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home: symlink-manager: 'cleanup-symlinks' uses 'file-system-fold'.

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* gnu/home/services/symlink-manager.scm (update-symlinks-script)[cleanup-symlinks]:
Take a home generation and iterate over its config files directly with
'file-system-fold'.  Adjuster caller accordingly.  Remove 'old-tree'.
This commit is contained in:
Ludovic Courtès 2022-02-18 23:34:34 +01:00
parent 5fabaf1128
commit 5fa188e92e
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1 changed files with 57 additions and 50 deletions
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107
gnu/home/services/symlink-manager.scm
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@ -118,51 +118,63 @@ (define (backup-file 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"))
(for-each
(match-lambda
(('dir . ".")
(display (G_ "Cleanup finished.\n\n")))
(define (cleanup-symlinks home-generation)
;; Delete from $HOME files that originate in HOME-GENERATION, the
;; store item containing a home generation.
(define config-file-directory
;; Note: Trailing slash is needed because "files" is a symlink.
(string-append home-generation "/files/"))
(('dir . directory)
(let ((directory (get-target-path directory)))
(catch 'system-error
(lambda ()
(rmdir directory)
(format #t (G_ "Removed ~a.\n") directory))
(lambda args
(let ((errno (system-error-errno args)))
(cond ((= ENOTEMPTY errno)
(format
#t
(G_ "Skipping ~a (not an empty directory)...\n")
directory))
((= ENOTDIR errno)
#t)
(else
(apply throw args))))))))
(define (strip file)
(string-drop file
(+ 1 (string-length config-file-directory))))
(('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)))
(format #t (G_ "Cleaning up symlinks from previous home at ~a.~%")
home-generation)
(newline)
(file-system-fold
(const #t)
(lambda (file stat _) ;leaf
(let ((file (get-target-path (strip file))))
(when (file-exists? file)
;; 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? file)
(begin
(format #t (G_ "Removing ~a...") file)
(delete-file file)
(display (G_ " done\n")))
(format #t
(G_ "Skipping ~a (not a symlink to store)... done\n")
file)))))
(const #t) ;down
(lambda (directory stat _) ;up
(unless (string=? directory config-file-directory)
(let ((directory (get-target-path (strip directory))))
(catch 'system-error
(lambda ()
(rmdir directory)
(format #t (G_ "Removed ~a.\n") directory))
(lambda args
(let ((errno (system-error-errno args)))
(cond ((= ENOTEMPTY errno)
(format
#t
(G_ "Skipping ~a (not an empty directory)...\n")
directory))
((= ENOTDIR errno) #t)
(else
(apply throw args)))))))))
(const #t) ;skip
(const #t) ;error
#t ;init
config-file-directory
lstat)
(display (G_ "Cleanup finished.\n\n")))
(define (create-symlinks new-tree new-files-path)
;; Create in directory NEW-TREE symlinks to the files under
@ -215,16 +227,11 @@ (define (get-source-path path)
;; to make file-system-tree works it should be a directory.
(new-files-dir-path (string-append new-files-path "/."))
(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))))
(when old-tree
(cleanup-symlinks old-tree))
(when old-home
(cleanup-symlinks old-home))
(create-symlinks new-tree new-files-path)