Bug 1665445: install-moz-phab installs the Phabricator credentials r=firefox-build-system-reviewers,rstewart

Since `install-moz-phab` is meant to simplify the moz-phab setup flow,
automatically prompting for Phabricator credentials removes an otherwise
manual step.

Detecting the "console_script" location of a package in a
cross-platform, virtualenv-supporting and "--user"-supporting way is
tough, and the most consistent solution seems to be to list the package
contents of moz-phab and look for the one that seems to be the entry
point.

Differential Revision: https://phabricator.services.mozilla.com/D90642

build/mach_bootstrap.py

@@ -427,7 +427,7 @@ def _finalize_telemetry_legacy(context, instance, handler, success, start_time,
 
     # The user is performing a maintenance command, skip the upload
     if handler.name in ('bootstrap', 'doctor', 'mach-commands', 'vcs-setup',
-                        'create-mach-environment',
+                        'create-mach-environment', 'install-moz-phab',
                         # We call mach environment in client.mk which would cause the
                         # data submission to block the forward progress of make.
                         'environment'):

mach

@@ -55,6 +55,7 @@ py2commands="
 nativecmds="
     bootstrap
     create-mach-environment
+    install-moz-phab
 "
 
 run_py() {

tools/phabricator/mach_commands.py

@@ -27,6 +27,7 @@ class PhabricatorCommandProvider(MachCommandBase):
         import os
         import subprocess
         import sys
+        import pkg_resources
 
         existing = mozfile.which("moz-phab")
         if existing and not force:
@@ -90,3 +91,23 @@ class PhabricatorCommandProvider(MachCommandBase):
 
         self.log(logging.INFO, "run", {}, "Installing moz-phab")
         subprocess.run(command)
+
+        dist = pkg_resources.get_distribution('mozphab')
+
+        # "get_metadata_lines('RECORD')" shows us all the files (paths and hashes) used by this
+        # package. Fetch them and strip off the hash.
+        package_files = [file.split(',')[0] for file in dist.get_metadata_lines('RECORD')]
+        potential_cli_paths = [file for file in package_files
+                               if os.path.basename(file) in ('moz-phab.exe', 'moz-phab')]
+
+        if len(potential_cli_paths) != 1:
+            self.log(
+                logging.WARNING,
+                "no_mozphab_console_script",
+                {},
+                "Could not find the CLI script for moz-phab. Skipping install-certificate step."
+            )
+            sys.exit(1)
+
+        console_script = os.path.realpath(os.path.join(dist.location, potential_cli_paths[0]))
+        subprocess.run([console_script, 'install-certificate'])