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utils: Add 'switch-symlinks', moved from (guix ui).

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* guix/ui.scm (switch-symlinks): Move to...
* guix/utils.scm: ... here.  New procedure.
* guix/scripts/pull.scm: Use it.
This commit is contained in:
Ludovic Courtès 2015-10-26 22:17:25 +01:00
parent 65797bfffd
commit 3bb168b099
3 changed files with 9 additions and 8 deletions
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1
guix/scripts/pull.scm
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@ -18,6 +18,7 @@
(define-module (guix scripts pull)
#:use-module (guix ui)
#:use-module (guix utils)
#:use-module (guix scripts)
#:use-module (guix store)
#:use-module (guix config)

8
guix/ui.scm
View file

@ -73,7 +73,6 @@
read/eval
read/eval-package-expression
location->string
switch-symlinks
config-directory
fill-paragraph
texi->plain-text
@ -715,13 +714,6 @@ replacement if PORT is not Unicode-capable."
(($ <location> file line column)
(format #f "~a:~a:~a" file line column))))
(define (switch-symlinks link target)
"Atomically switch LINK, a symbolic link, to point to TARGET. Works
both when LINK already exists and when it does not."
(let ((pivot (string-append link ".new")))
(symlink target pivot)
(rename-file pivot link)))
(define (config-directory)
"Return the name of the configuration directory, after making sure that it
exists. Honor the XDG specs,

8
guix/utils.scm
View file

@ -74,6 +74,7 @@
arguments-from-environment-variable
file-extension
file-sans-extension
switch-symlinks
call-with-temporary-output-file
call-with-temporary-directory
with-atomic-file-output
@ -557,6 +558,13 @@ minor version numbers from version-string."
(substring file 0 dot)
file)))
(define (switch-symlinks link target)
"Atomically switch LINK, a symbolic link, to point to TARGET. Works
both when LINK already exists and when it does not."
(let ((pivot (string-append link ".new")))
(symlink target pivot)
(rename-file pivot link)))
(define* (string-replace-substring str substr replacement
#:optional
(start 0)