Return the package name part of PATH, a file name in the store.

Return information about the subset of PATHS that is substitutable. For each substitutable path, a `substitutable?' object is returned; thus, the resulting list can be shorter than PATHS. Furthermore, that there is no guarantee that the order of the resulting list matches the order of PATHS.

Return the SHA256 hash of the nar serialization of PATH as a bytevector.

Return the names of the supported built-in derivation builders supported by STORE.

Return the build log file for FILE, or #f if none could be found. FILE must be an absolute store file name, or a derivation file name.

Monadic version of 'query-path-info' that returns #f when ITEM is not in the store.

Return the list of currently configured substitutes URLs for STORE, or #f if the daemon is too old and does not implement this RPC.

Return the direct store path part of PATH, stripping components after '/gnu/store/xxxx-foo'.

Call PROC, and catch if a connection fails, print a warning and return #f.

Look up narinfos for PATHS on all of CACHES, a list of URLS, in that order. That is, when a cache lacks an AUTHORIZED? narinfo, look it up in the next cache, and so on.

Return a list of narinfos for PATHS or a subset thereof. The returned narinfos are either AUTHORIZED?, or they claim a hash that matches an AUTHORIZED? narinfo.

Return the narinfos for PATHS, invoking the server at CACHE when no information is available locally.

Download from REF, a <svn-reference> object to STORE. Write progress reports to LOG.

Download from REF, a <svn-multi-reference> object to STORE. Write progress reports to LOG.