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| author | Ludovic Courtès <ludo@gnu.org> | 2018-07-02 23:50:38 +0200 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2018-07-03 00:39:10 +0200 |
| commit | 0744a9f0029b2f78cc86b193214004b4501fa847 (patch) | |
| tree | 5c063b17909770bd7b09be6bbca9debf99e7cac3 /guix/store.scm | |
| parent | 24420f5ffabfbdbe913a5765e5c00e17de18fb4c (diff) | |
| download | gnu-guix-0744a9f0029b2f78cc86b193214004b4501fa847.tar gnu-guix-0744a9f0029b2f78cc86b193214004b4501fa847.tar.gz | |
store: Add 'query-path-info*'.
* guix/scripts/size.scm (query-path-info*): Move to...
* guix/store.scm (query-path-info*): ... here.
Diffstat (limited to 'guix/store.scm')
| -rw-r--r-- | guix/store.scm | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/guix/store.scm b/guix/store.scm index 3bf56573bf..bac42f2738 100644 --- a/guix/store.scm +++ b/guix/store.scm @@ -107,6 +107,7 @@ references references/substitutes references* + query-path-info* requisites referrers optimize-store @@ -1398,6 +1399,15 @@ where FILE is the entry's absolute file name and STAT is the result of (define references* (store-lift references)) +(define (query-path-info* item) + "Monadic version of 'query-path-info' that returns #f when ITEM is not in +the store." + (lambda (store) + (guard (c ((nix-protocol-error? c) + ;; ITEM is not in the store; return #f. + (values #f store))) + (values (query-path-info store item) store)))) + (define-inlinable (current-system) ;; Consult the %CURRENT-SYSTEM fluid at bind time. This is equivalent to ;; (lift0 %current-system %store-monad), but inlinable, thus avoiding |