Return the build log file for DRV, a derivation file name, or #f if it could not be found.

Return as a monadic value the absolute file name in the store of the file containing DATA, a bytevector. REFERENCES is a list of store items that the resulting text file refers to; it defaults to the empty list.

Return a procedure of two arguments to record cache lookups, hits, and misses for COMPONENT. The procedure must be passed a Boolean indicating whether the cache lookup was a hit, and the actual cache (a vhash).

Add a garbage collector root pointing to TARGET, an element of the store, preventing TARGET from even being collected. This can also be used if TARGET does not exist yet.

Raise an error if the caller does not have write access to the GC root directory.

Return the store path whose hash part is HASH-PART (a nix-base32 string). Return the empty string if no such path exists.

Add the given TREE to the store on SERVER. TREE must be an entry such as:

("my-tree" directory ("a" regular (data "hello")) ("b" symlink "a") ("c" directory ("d" executable (file "/bin/sh"))))

This is a generalized version of 'add-to-store'. It allows you to reproduce an arbitrary directory layout in the store without creating a derivation.

Export the store paths listed in PATHS to PORT, in topological order, signing them if SIGN? is true. When RECURSIVE? is true, export the closure of PATHS---i.e., PATHS and all their dependencies.

START, PROGRESS, and FINISH are used to track progress of the data transfer. START is a one-argument that is passed the list of store items that will be transferred; it returns values that are then used as the initial state threaded through PROGRESS calls. PROGRESS is passed the store item about to be sent, along with the values previously return by START or by PROGRESS itself. FINISH is called when the last store item has been called.

Return as a monadic value the absolute file name in the store of the file containing TEXT, a string. REFERENCES is a list of store items that the resulting text file refers to; it defaults to the empty list.

Return the info (hash, references, etc.) for PATH.

Return #t when PATH designates a valid store item and #f otherwise (an invalid item may exist on disk but still be invalid, for instance because it is the result of an aborted or failed build.)

A '&store-protocol-error' condition is raised if PATH is not prefixed by the store directory (/gnu/store).

Return the hash part of PATH as a base32 string, or #f if PATH is not a syntactically valid store path.

Build THINGS, a list of store items which may be either '.drv' files or outputs, and return when the worker is done building them. Elements of THINGS that are not derivations can only be substituted and not built locally. Alternately, an element of THING can be a derivation/output name pair, in which case the daemon will attempt to substitute just the requested output of the derivation. Return #t on success.

When a handler is installed with 'with-build-handler', it is called any time 'build-things' is called.

Optimize the store by hard-linking identical files ("deduplication".) Return #t on success.

Return #t if PATH is a store path.