If FILE is a gzip file, reset its embedded timestamp (as with 'gzip --no-name') and return true. Otherwise return #f. When KEEP-MTIME? is true, preserve FILE's modification time.

Find a file named FILE among the INPUTS and return its absolute file name.

FILE must be a string like "bin/sh". If FILE is not found, an exception is raised.

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 call.

Create directory DIR and all its ancestors.

Return the name of locale category CATEGORY, one of the 'LC_' constants. If CATEGORY is a bitwise or of several 'LC_' constants, an approximation is returned.

Return true if FILE is in the store.

Remove from FILE occurrences of file names in STORE; return #t when store paths were encountered in FILE, #f otherwise. This procedure is known as `nuke-refs' in Nixpkgs.

Wrap the script PROG such that VARS are set first. The format of VARS is the same as in the WRAP-PROGRAM procedure. This procedure differs from WRAP-PROGRAM in that it does not create a separate shell script. Instead, PROG is modified directly by prepending a Guile script, which is interpreted as a comment in the script's language.

Special encoding comments as supported by Python are recreated on the second line.

Note that this procedure can only be used once per file as Guile scripts are not supported.

Open FILE as an ASCII or binary file, and pass the resulting port to PROC. FILE is closed when PROC's dynamic extent is left. Return the return values of applying PROC to the port.

Set the atime/mtime of FILE to that specified by STAT.

This is like 'every', but process all the elements of LST instead of stopping as soon as PRED returns false. This is useful when PRED has side effects, such as displaying warnings or error messages.

Return the name of the compressor package/binary used to compress or decompress FILE-NAME, based on its file extension, else false.

Create DIRECTORY if it does not exist and copy FILE in there under the same name.

Return #t if FILE exists and is executable.

Return the lexicographically sorted list of files under DIR for which PRED returns true. PRED is passed two arguments: the absolute file name, and its stat buffer; the default predicate always returns true. PRED can also be a regular expression, in which case it is equivalent to (file-name-predicate PRED). STAT is used to obtain file information; using 'lstat' means that symlinks are not followed. If DIRECTORIES? is true, then directories will also be included. If FAIL-ON-ERROR? is true, raise an exception upon error.

Return the complete file name for PROGRAM as found in $PATH, or #f if PROGRAM could not be found.

Given NAME, a package name like "foo-0.9.1b", return two values: "foo" and "0.9.1b". When the version part is unavailable, NAME and #f are returned. The first hyphen followed by a digit is considered to introduce the version part.

Return the directory name of the store.