Convert a DISTINFO string into an alist.

Return the latest verion of distribution specification.

name: <distribution-name> version: <destribution-release-version-date> system-index-url: <url-to-systems-list> release-index-url: <url-to-release-packages> archive-base-url: <url-base> canonical-distinfo-url: <url-to-released-dist-info> distinfo-subscription-url: <url-to-current-distribution-info-file>

Parse SYSTEMS string and return a list of metadata list and dependencies list of the given project. Each field of the SYSTEMS strings separated by a single space and have following sequence.

The first line starting with # of the file is a header with following format: - <field-0> :: project - <field-1> :: system file - <field-2> :: system name - <field-3...n> :: list of dependencies

Fetch CHANGESET from URL into DIRECTORY. CHANGESET must be a valid Mercurial changeset identifier. Return #t on success, #f otherwise.

Return the file-name for packages using pijul-download.

Return the version string for packages using pijul-download.

This procedure evaluates to a predicate that reports back whether a given file - stat combination is part of the files tracked by Pijul.

Return a fixed-output derivation that fetches REF, a <pijul-reference> object. The output is expected to have recursive hash HASH of type HASH-ALGO (a symbol). Use NAME as the file name, or a generic name if #f.