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store: Memoize 'add-to-store' based on the result of 'lstat', not 'stat'.

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* guix/store.scm (add-to-store): Change 'stat' call to 'lstat'.  Clarify
  docstring.
This commit is contained in:
Ludovic Courtès 2015-06-19 10:17:37 +02:00
parent 020f3e4156
commit 69792b285c
1 changed files with 6 additions and 5 deletions
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11
guix/store.scm
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@ -610,11 +610,12 @@ path."
store-path)))
(lambda (server basename recursive? hash-algo file-name)
"Add the contents of FILE-NAME under BASENAME to the store. When
RECURSIVE? is true and FILE-NAME designates a directory, the contents of
FILE-NAME are added recursively; if FILE-NAME designates a flat file and
RECURSIVE? is true, its contents are added, and its permission bits are
kept. HASH-ALGO must be a string such as \"sha256\"."
(let* ((st (stat file-name #f))
RECURSIVE? is false, FILE-NAME must designate a regular file--not a directory
nor a symlink. When RECURSIVE? is true and FILE-NAME designates a directory,
the contents of FILE-NAME are added recursively; if FILE-NAME designates a
flat file and RECURSIVE? is true, its contents are added, and its permission
bits are kept. HASH-ALGO must be a string such as \"sha256\"."
(let* ((st (false-if-exception (lstat file-name)))
(args `(,st ,basename ,recursive? ,hash-algo))
(cache (nix-server-add-to-store-cache server)))
(or (and st (hash-ref cache args))