MobDev.Plugin.NifActivation (mob_dev v0.7.4)

Warnings for the two ways a plugin's NIF silently misses the installed app (MOB-281).

A plugin's on_load tolerates a missing NIF, so neither case fails a build or a boot — the first signal is {:nif_not_loaded, ...} from the first NIF call, with nothing pointing at the cause:

Installed but not activated. The plugin is in mix.exs deps but not in config :mob, :plugins in mob.exs. Activation is the deliberate second opt-in step (see MOB_PLUGINS.md), so the native build compiles none of its NIFs. mix mob.deploy --native and mix mob.doctor name every such device-runtime dep (not only: :dev / runtime: false) that declares nifs: and print the exact config line.
Activated after the last native build. The plugin is activated, but only a BEAM-only mix mob.deploy / mix mob.push ran since, so the installed binary predates it. Every successful native build records, per platform, which activated plugins it compiled NIFs for (mob_native_plugins.txt under Mix.Project.build_path/0); a BEAM-only deploy or push compares the current activation against that record and names the plugins the installed app was built without.

The checks themselves are advisory: warnings, never errors, and a failure to write the record is itself only a warning. (A mob.exs that fails to load still raises, as every mob.exs reader does — MOB-280.) The record describes the last native build on this machine for this MIX_ENV, not what a particular device has installed — a device last installed from another checkout or before a mix clean can still disagree with it. A missing record (a project built before this check existed, or a wiped _build) is reported separately from a known stale build.

Manifests are read through MobDev.Plugin.Verify.load_verified/2, like every other build path (MOB-74): a dep whose manifest fails verification is never evaluated, so its NIFs are unknown and it is not reported here.

Summary

Types

build_record()

Per-platform plugin names compiled into the last native build.

dep_manifest()

{dep_name, manifest} — nil for a non-plugin dep or an unverifiable manifest.

drift()

One stale-build finding: the plugin, the platform, and why.

Functions

activated()

The activated plugin names, non-atom entries dropped.

config_line(activated, inactive)

The config :mob, :plugins, [...] line that activates inactive on top of the currently activated plugins — the whole list, so it replaces the existing line verbatim.

dep_manifests()

Every dep as {name, manifest}, manifests read through Verify.load_verified/2 (honouring :acknowledge_unsafe_plugins, like MobDev.Plugin.activated_with_verify/0). Unverifiable manifests are nil.

drift(current, recorded, platforms)

Plugins activated now (current, from nif_plugins_by_platform/2) that the recorded native build for each of platforms lacks. :not_built when that platform has a record without the plugin; :no_record when that platform was never recorded. Sorted by plugin, then platform.

drift_warning(drift)

The yellow warning block for drift/3's result, or nil when empty.

inactive_nif_plugins(activated)

inactive_nif_plugins/3 for this project, against the activated plugins.

inactive_nif_plugins(dep_manifests, activated, runtime)

Device-runtime deps that ship a manifest declaring at least one NIF but are not in activated. runtime is the set of dep names that ship to the device (MobDev.HotPush.runtime_lib_names/0): an only: :dev or runtime: false dep never reaches the app, so activating it would fix nothing. Tier-0 plugins (no manifest), manifests without nifs:, and activated plugins are never flagged. Sorted.

inactive_warning(inactive, activated)

The yellow warning block for inactive_nif_plugins/3's result, or nil when it is empty. activated is the current config :mob, :plugins list; the printed config line is that list plus the inactive plugins, so it can replace the existing line verbatim.

nif_plugins_by_platform(dep_manifests, activated)

For each platform, the activated plugins whose manifest declares a NIF for it (a NIF without :platform counts for both). Every platform is a key, possibly with []. Names are strings, the form the record stores.

node_platforms(nodes, app)

The platforms of connected device nodes of the project app app, from the node names MobDev.Device.node_name/1 builds: <app>_android[_<suffix>]@… and <app>_ios[_<suffix>]@…. The app prefix is stripped before reading the platform, so an app named e.g. my_ios_app isn't mistaken for iOS. Nodes of other apps are ignored.

parse_record(text)

Parses the record file's text. One line per platform — the platform name followed by the space-separated plugin names; # lines are comments. Unknown platforms and malformed lines are ignored.

put_record(record, platform, names)

record with platform's entry replaced by names; other platforms kept.

read_record(path)

Reads the record at path; a missing or unreadable file is %{}.

record_native_build(platforms)

Records that a native build for each of platforms just succeeded with the currently activated NIF plugins. Other platforms' entries are kept.

record_native_build(platforms, current, path)

Merges current's entries for platforms into the record at path. The record is advisory: a write failure prints a warning and returns :ok rather than failing the build that just succeeded.

record_path()

Where the native-build record lives: under Mix.Project.build_path/0.

render_record(record)

Renders a record as the text parse_record/1 reads.

warn_inactive()

Prints inactive_warning/2 for this project, if any.

warn_stale_build(platforms)

Prints drift_warning/1 for a BEAM-only deploy or push to platforms, if any.