Remove expired narinfo entries from the cache if deemed necessary. Call CACHE-ENTRIES with CACHE to retrieve the list of cache entries.

ENTRY-EXPIRATION must be a procedure that, when passed an entry, returns the expiration time of that entry in seconds since the Epoch. DELETE-ENTRY is a procedure that removes the entry passed as an argument. Finally, CLEANUP-PERIOD denotes the minimum time between two cache cleanups.

Return a channel instance for CHECKOUT, which is assumed to be a checkout of COMMIT at URL. Use NAME as the channel name.

Return as a monadic value the derivation that builds the profile for the latest instances of CHANNELS. CURRENT-CHANNELS and VALIDATE-PULL are passed to 'latest-channel-instances'.

Return the list of channels corresponding to entries in PROFILE. If PROFILE is not a profile created by 'guix pull', return the empty list.

Return true if CHANNEL is the 'guix' channel.

Raise an error if RELATION is not 'ancestor, meaning that START is not an ancestor of COMMIT, unless CHANNEL specifies a commit.

This procedure implements a channel update policy meant to be used as a #:validate-pull argument.

Return the derivation of the profile containing INSTANCES, a list of channel instances. If BUILT-IN-BUILDERS is provided, it should be a list of strings and this will be used instead of the builtin builders provided by the build daemon for store connections used during this process.

Look for a Git repository in DIRECTORY or its ancestors and return a channel that uses that repository and the commit HEAD currently points to; use INTRODUCTION as the channel's introduction. Return #f if no Git repository could be found at DIRECTORY or one of its ancestors.

Return a new channel introduction: COMMIT is the introductory where authentication starts, and SIGNER is the OpenPGP fingerprint (a bytevector) of the signer of that commit.

Convert STR, an OpenPGP fingerprint (hexadecimal string with whitespace), to the corresponding bytevector.