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by default, all apps except internal rebar3 ones can be blacklisted.
Some months ago, someone added support for configurable lists within
rebar3 itself using the .app env.
This PR re-exports that functionality from the rebar.config file, so
that one can set something like:
{shell, [
{app_reload_blacklist, [cowboy, ranch]}
]}.
Which will allow to prevent applications that often crash when being
reloaded from doing so. For example, cowboy and ranch processes can be
stuck in an accept call for multiple reloads in dev, which ends up
causing large failures.
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This is mostly useful for tests, where a test suite of any kind can be
interrupted halfway through so that the user can probe the running
system to see what is happening.
This is done as follows:
1. the user must call `r3:break()` in a test suite
2. the user runs the task as `r3:async_do(ct)`
3. the test holds up and the user can do whatever
4. the user calls `r3:resume()` and the test proceeds as normal
A safeguard is added so that breakpoints are only triggered in the shell
in async mode
Sample session:
$ rebar3 shell
...
1> rebar_agent:async_do(ct).
ok
...
Running Common Test suites...
%%% rebar_alias_SUITE: .
=== BREAK ===
2> % <do some checks>
2> r3:resume().
ok
3> .....
%%% rebar_as_SUITE: ...........
%%% rebar_compile_SUITE: ......
...
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beam_lib:md5/1 to get the module's vsn
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refresh_paths when recompile
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Based off a macro by @okeuday at https://github.com/erlang/otp/pull/1783
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This is done through 3 main change groups:
- replacing `~s` by `~ts` in format strings, so that strings that
contain unicode are properly printed rather than crashing
- adding the `unicode` argument to all function of the `re` module to
ensure transformations on strings containing unicode data are valid
instead of crashing (see issue #1302)
- replacing `ec_cnv:to_binary/1` and `ec_cnv:to_list/1` with matching
functions in `rebar_utils`.
The last point has been done, rather than modifying and updating erlware
commons, because binary and list conversions can be a contentious
subject. For example, if what is being handled is actually bytes from a
given binary stream, then forcing a byte-oriented interpretation of the
data can corrupt it. As such, it does not appear safe to modify erlware
commons' conversion functions since it may not be safe for all its
users.
Instead, rebar3 reimplements a subset of them (only converting
atoms and chardata, ignoring numbers) with the explicit purpose of
handling unicode string data.
Tests were left as unchanged as possible. This may impact the ability to
run rebar3's own suites in a unicode path, but respects a principle of
least change for such a large patch.
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This uses the very risky '$handle_undefined_function'/2 export from the
r3 and rebar_agent modules to allow meta-calls that can support plugins
and all other rebar3 extensions.
This is nasty but very tempting. Currently we only support:
- r3:do(Command)
- r3:do(Namespace, Command)
There is currently no way to pass arguments to the function such that we
can, for example, run cover analysis or tests on a subset of suites.
With the new abuse of '$handle_undefined_function'/2, we can detect the
unused commands (since they are not exported) and re-route them:
- r3:Command()
- r3:Command("--args=as a string")
- r3:Command(Namespace, "--args=as a string")
Of course, in doing so, we make it impossible to use the 'do' provider
(as in 'rebar3 do ct -c, cover') since the 'do' function is already
required for things to work.
Since the previous function had very strict guards, we can, without
conflict, add manual overrides that simulate the meta-calls fine.
Sample run:
https://gist.github.com/ferd/2c06d59c7083c146d25e4ee301de0073
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Includes improvments and function documentation for all modules (in
alphabetical order) up to rebar_core, and may have included more in
other modules as I saw fit to dig and understand more of the internals.
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opps. Infinite loop fixed.
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https://github.com/erlang/rebar3/pull/1317
In reference to with support to load erlang code atomically but load nifs non-atomically.
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When an app contains one of the modules we can't afford to get upgraded
without breakage (i.e. erlware_commons, providers, getopt), skip
reloading that application from the rebar3 agent, such that it can keep
on working in subsequent calls.
Blacklisted:
- erlware_commons (broke on ec_cmd_log)
- providers (core to functionality)
- cf (useful to not explode on colors)
- cth_readable (only used for CT suites, but incompatibilities may break
whole runs)
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This tries to reduce memory usage when running `rebar3 shell` by running
the agent in the current process (and avoiding to copy state
cross-boundaries), and using frequent hibernation after each run to
force a full GC and compaction of the current process.
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The old run didn't necessarily apply all profiles well, and would only
reload modules in the app file. However, since adding extra_src_dirs,
modules can be compiled without ending up in the app file; this lets
the rebar3 shell agent handle that case.
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The feature may still be modified in the future.
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This allows proper checking of new configurations, deps, or plugins, and
makes sure they are detected during an active shell session.
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The shell agent allows to run rebar3 commands and autoload compiled
modules when that is done.
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