core_version is a string the code states, null or keyed by build mode,
and the schema refuses Git, SVN, unknown, master, main, latest, dev and
HEAD, alone or annotated. version_basis is defined per kind with the
fields each one needs, and kind none requires a null version.
tests/test_version_basis.py reads a recorded fixture of forge answers
offline and fails on drift, holds every profile to a basis (tag versions
in describe form, aliases equal to their profile, none as null), checks
that a pin advance reads the version again or is refused, and that the
schema refuses placeholders.
version_basis says where a profile's version is read: a pattern in a
file, the nearest tag and its distance, an alias, a package, none, or
unverified with the reason. profile_sync --verify-version reads it again
at the pin and exits 1 on a difference, --set-version writes what the
code states. A pin advance reads the version at the new pin in the same
write and is refused when it cannot.
upstream.describe counts the commits after the nearest tag in a treeless
clone kept under the cache, and graph_ancestry answers a pair GitHub
refuses to compare.
Abdessamad Derraz