Auto merge of #29909 - mrobinson:mach-bootstrap-macos, r=mukilan

Implement `./mach bootstrap` for MacOS

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---
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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes do not require tests because they just change build scripts.

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1 files changed, 15 insertions, 0 deletions

diff --git a/python/servo/platform/macos.py b/python/servo/platform/macos.py
index 0f5ca632b2f..38169e9a75a 100644
--- a/python/servo/platform/macos.py
+++ b/python/servo/platform/macos.py
@@ -54,6 +54,21 @@ class MacOS(Base):
             return False
         return True
 
+    def _platform_bootstrap(self, _cache_dir: str, force: bool) -> bool:
+        installed_something = False
+        try:
+            brewfile = os.path.join(util.SERVO_ROOT, "etc", "homebrew", "Brewfile")
+            output = subprocess.check_output(
+                ['brew', 'bundle', 'install', "--file", brewfile]
+            ).decode("utf-8")
+            print(output)
+            installed_something = "Installing" in output
+        except subprocess.CalledProcessError as e:
+            print("Could not run homebrew. Is it installed?")
+            raise e
+        installed_something |= self._platform_bootstrap_gstreamer(False)
+        return installed_something
+
     def _platform_bootstrap_gstreamer(self, force: bool) -> bool:
         if not force and self.is_gstreamer_installed(cross_compilation_target=None):
             return False