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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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8
guix/utils.scm
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@ -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)