opam package file access.
Normally opam metadata access is only needed at distribution
time and this is handled by
Topkg_care.Opam.File using the
However there is one case where we want to be able to access
the metadata from
Topkg: on pin builds where the
watermarking process needs to be run to turn
the repo into a pseudo-distribution.
Since we don't want
Topkg to have any dependency and that
opam currently doesn't allow to consult the fields of arbitrary
opam files (see
issue #2446) we
assume a pin build has the
topkg tool installed and call
to it to get the opam fields for watermarking (if
unavailable the watermarks are simply undefined).
(string * string list) list
The type for a simplified model the fields of an opam
val codec :
codec is a codec for opam file fields.
val fields :
Topkg.fpath -> (string * string list) list Topkg.result
fields file are the fields of the opam file
are obtained by calling the
topkg topkg executable.