This is so that the Installer will be built with the correct Swift
settings, especially those that instruct the Xcode to package the Swift
runtime libraries. This is needed because the Installer now depends on
InputSourceHelper, which is written in Swift. Without this, the app
would not be packaged with the Swift runtime libraries, which caused
the installer to be unusable on older but supported macOS versions.
We now let the Installer to call the TextInputSources API. Since macOS
12, users are prompted to allow enabling of third-party IMEs in
Preferences.app the momemnt TISRegisterInputSource or
TISEnableInputSource is called. By moving the activation to the
Installer, a user will clearly see that it's the Installer that wants to
enable the IME.
In addition, we had to make necessary changes so that on macOS 12 and
later, the Installer always enable the default input source. This is due
to the observation that the kTISPropertyInputSourceIsEnabled becomes
unreliable on macOS 12--it may be true even if the user has removed the
input mode from their active input mode list in Preferences.app.
This ensures that, after the Installer has killed the current input method
process, the Installer can tell if the translocated input method bundle is no
longer mounted. It turns out that getfsstat() may return cached results and a
call to statfs() is necessary.
This fixes the bug that the Installer did not always correctly report that a
new version of the input method has been installed over a previous version.
The bug only manifests when getfsstat() returns cached results. That seems to
be the case on newer versions of macOS.
Soon notarization will be required for Developer ID apps. This change allows
the Installer to run in two modes. The "dev mode" still builds the IME as
the prerequisite of the Installer and places the IME app bundle inside the
Installer's resources folder. That has been so since the beginning of this
project, and this continues to allow IME developers to test the input method.
On the other hand, if "McBopomofo-r$rev.zip" is placed in the NotarizedArchives
folder and McBopomofo is not built as a dependency of the Installer and the
app bundle is not copied to the resources folder, the Installer then can be
built as a notarizable app (otherwise Xcode wouldn't even let you submit it
for notarization).
To build the distributable Installer, notarize the IME app first, then zip the
app as McBopomofo-r$rev.zip and place that to the NotarizedArchives folder
under Source/Installer. Then build and submit the Installer for notarization.
This is in line with Apple's guideline in
https://developer.apple.com/documentation/xcode/notarizing_your_app_before_distribution/customizing_the_notarization_workflow
("If you distribute your software via a custom third-party installer, you need
two rounds of notarization.")
We don't expect that we make new Installers often enough, and therefore we
don't intend to automate this process via scripting.