home: symlink-manager: 'create-symlinks' uses 'file-system-fold'.
This removes the need for two intermediate representations of the file tree. * gnu/home/services/symlink-manager.scm (update-symlinks-script) [simplify-file-tree, file-tree-traverse]: Remove. [create-symlinks]: Rewrite in terms of 'file-system-fold'.
This commit is contained in:
Ludovic Courtès
parent
5fa188e92e
commit
1fb6ef0473
@ -43,52 +43,11 @@
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(guix i18n)))
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#~(begin
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(use-modules (ice-9 ftw)
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(ice-9 curried-definitions)
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(ice-9 match)
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(srfi srfi-1)
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(guix i18n)
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(guix build utils))
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(define ((simplify-file-tree parent) file)
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"Convert the result produced by `file-system-tree' to less
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verbose and more suitable for further processing format.
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Extract dir/file info from stat and compose a relative path to the
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root of the file tree.
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Sample output:
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((dir . \".\")
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((dir . \"config\")
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((dir . \"config/fontconfig\")
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(file . \"config/fontconfig/fonts.conf\"))
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((dir . \"config/isync\")
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(file . \"config/isync/mbsyncrc\"))))
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"
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(match file
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((name stat) `(file . ,(string-append parent name)))
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((name stat children ...)
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(cons `(dir . ,(string-append parent name))
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(map (simplify-file-tree
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(if (equal? name ".")
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""
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(string-append parent name "/")))
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children)))))
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(define ((file-tree-traverse preordering) node)
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"Traverses the file tree in different orders, depending on PREORDERING.
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if PREORDERING is @code{#t} resulting list will contain directories
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before files located in those directories, otherwise directory will
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appear only after all nested items already listed."
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(let ((prepend (lambda (a b) (append b a))))
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(match node
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(('file . path) (list node))
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((('dir . path) . rest)
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((if preordering append prepend)
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(list (cons 'dir path))
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(append-map (file-tree-traverse preordering) rest))))))
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(define home-path
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(getenv "HOME"))
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@ -176,64 +135,63 @@ appear only after all nested items already listed."
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(display (G_ "Cleanup finished.\n\n")))
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(define (create-symlinks new-tree new-files-path)
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;; Create in directory NEW-TREE symlinks to the files under
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;; NEW-FILES-PATH, creating backups as needed.
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(define (create-symlinks home-generation)
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;; Create in $HOME symlinks for the files in HOME-GENERATION.
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(define config-file-directory
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;; Note: Trailing slash is needed because "files" is a symlink.
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(string-append home-generation "/files/"))
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(define (strip file)
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(string-drop file
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(+ 1 (string-length config-file-directory))))
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(define (get-source-path path)
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(readlink (string-append new-files-path "/" path)))
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(readlink (string-append config-file-directory path)))
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(let ((to-create ((file-tree-traverse #t) new-tree)))
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(for-each
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(match-lambda
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(('dir . ".")
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(display
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(G_ "New symlinks to home-environment will be created soon.\n"))
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(format
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#t (G_ "All conflicting files will go to ~a.\n\n") backup-dir))
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(('dir . path)
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(let ((target-path (get-target-path path)))
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(when (and (file-exists? target-path)
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(not (file-is-directory? target-path)))
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(backup-file path))
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(if (file-exists? target-path)
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(format
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#t (G_ "Skipping ~a (directory already exists)... done\n")
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target-path)
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(begin
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(format #t (G_ "Creating ~a...") target-path)
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(mkdir target-path)
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(display (G_ " done\n"))))))
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(('file . path)
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(when (file-exists? (get-target-path path))
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(backup-file path))
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(file-system-fold
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(const #t) ;enter?
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(lambda (file stat result) ;leaf
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(let ((source (get-source-path (strip file)))
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(target (get-target-path (strip file))))
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(when (file-exists? target)
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(backup-file (strip file)))
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(format #t (G_ "Symlinking ~a -> ~a...")
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(get-target-path path) (get-source-path path))
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(symlink (get-source-path path) (get-target-path path))
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target source)
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(symlink source target)
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(display (G_ " done\n"))))
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to-create)))
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(lambda (directory stat result) ;down
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(unless (string=? directory config-file-directory)
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(let ((target (get-target-path (strip directory))))
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(when (and (file-exists? target)
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(not (file-is-directory? target)))
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(backup-file (strip directory)))
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(catch 'system-error
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(lambda ()
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(mkdir target))
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(lambda args
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(let ((errno (system-error-errno args)))
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(unless (= EEXIST errno)
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(format #t (G_ "failed to create directory ~a: ~s~%")
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target (strerror errno))
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(apply throw args))))))))
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(const #t) ;up
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(const #t) ;skip
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(const #t) ;error
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#t ;init
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config-file-directory))
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#$%initialize-gettext
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(let* ((he-path (string-append (getenv "HOME") "/.guix-home"))
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(new-he-path (string-append he-path ".new"))
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(new-home (getenv "GUIX_NEW_HOME"))
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(old-home (getenv "GUIX_OLD_HOME"))
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(new-files-path (string-append new-home "/files"))
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;; Trailing dot is required, because files itself is symlink and
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;; to make file-system-tree works it should be a directory.
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(new-files-dir-path (string-append new-files-path "/."))
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(new-tree ((simplify-file-tree "")
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(file-system-tree new-files-dir-path))))
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(old-home (getenv "GUIX_OLD_HOME")))
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(when old-home
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(cleanup-symlinks old-home))
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(create-symlinks new-tree new-files-path)
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(create-symlinks new-home)
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(symlink new-home new-he-path)
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(rename-file new-he-path he-path)
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