Return the "reference" for CHANNEL, an sexp suitable for 'latest-repository-commit'.

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 an sexp representation of INSTANCE, a channel instance.

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 list of channel instances corresponding to the latest checkouts of CHANNELS and the channels on which they depend.

When AUTHENTICATE? is true, authenticate the subset of CHANNELS that has a "channel introduction".

When VERIFY-CERTIFICATE? is false, invalid X.509 host certificates are accepted.

CURRENT-CHANNELS is the list of currently used channels. It is compared against the newly-fetched instances of CHANNELS, and VALIDATE-PULL is called for each channel update and can choose to emit warnings or raise an error, depending on the policy it implements.

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.

Read SEXP, a provenance sexp as created by 'channel-instance->sexp'; use NAME as the channel name if SEXP does not specify it. Return #f if the sexp does not have the expected structure.

Return the latest builds performed by the CI server at URL. If EVALUATION is an integer, restrict to builds of EVALUATION. If SYSTEM is true (a system string such as "x86_64-linux"), restrict to builds for SYSTEM.