diff options
Diffstat (limited to 'guix/build')
| -rw-r--r-- | guix/build/utils.scm | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/guix/build/utils.scm b/guix/build/utils.scm index b822caf619..ce7bdb2024 100644 --- a/guix/build/utils.scm +++ b/guix/build/utils.scm @@ -60,6 +60,7 @@ directory-exists? executable-file? symbolic-link? + switch-symlinks call-with-temporary-output-file call-with-ascii-input-file file-header-match @@ -240,6 +241,13 @@ introduce the version part." "Return #t if FILE is a symbolic link (aka. \"symlink\".)" (eq? (stat:type (lstat file)) 'symlink)) +(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 (call-with-temporary-output-file proc) "Call PROC with a name of a temporary file and open output port to that file; close the file and delete it when leaving the dynamic extent of this |