From 33f5b67fcaeb8705b04fd1b850873a180dc89aaa Mon Sep 17 00:00:00 2001
From: Paul Cruz <paulcruz74@meta.com>
Date: Mon, 18 Nov 2024 10:53:53 -0800
Subject: [PATCH] Allow systemd libs to be built from source

Summary:
X-link: https://github.com/facebookincubator/zstrong/pull/1066

Changes to enable building systemd libs from source (rather than relying on
system packages i.e. systemd, systemd-devel).

From the FBOSS perspective, this is desirable because statically linking the dependencies into the binaries makes them easier to package without relying on similar state between build and runtime environments.

Reviewed By: somasun

Differential Revision:
D65827936

Privacy Context Container: L1125642

fbshipit-source-id: c0ba2f0690466a969bb4d9a4db664b9a5b3d3d79
---
 build/fbcode_builder/getdeps/builder.py  | 55 ++++++++++++++++++++++++
 build/fbcode_builder/getdeps/manifest.py | 13 ++++++
 build/fbcode_builder/manifests/systemd   |  9 ++++
 3 files changed, 77 insertions(+)

diff --git a/build/fbcode_builder/getdeps/builder.py b/build/fbcode_builder/getdeps/builder.py
index 65bca2692a8..10bd2a62a62 100644
--- a/build/fbcode_builder/getdeps/builder.py
+++ b/build/fbcode_builder/getdeps/builder.py
@@ -487,6 +487,61 @@ def _build(self, reconfigure) -> None:
         self._run_cmd(install_cmd, env=env)
 
 
+class SystemdBuilder(BuilderBase):
+    # SystemdBuilder assumes that meson build tool has already been installed on
+    # the machine.
+    def __init__(
+        self,
+        loader,
+        dep_manifests,
+        build_opts,
+        ctx,
+        manifest,
+        src_dir,
+        build_dir,
+        inst_dir,
+    ) -> None:
+        super(SystemdBuilder, self).__init__(
+            loader,
+            dep_manifests,
+            build_opts,
+            ctx,
+            manifest,
+            src_dir,
+            build_dir,
+            inst_dir,
+        )
+
+    def _build(self, reconfigure) -> None:
+        env = self._compute_env()
+        meson = path_search(env, "meson")
+        if meson is None:
+            raise Exception("Failed to find Meson")
+
+        # Meson builds typically require setup, compile, and install steps.
+        # During this setup step we ensure that the static library is built and
+        # the prefix is empty.
+        self._run_cmd(
+            [
+                meson,
+                "setup",
+                "-Dstatic-libsystemd=true",
+                "-Dprefix=/",
+                self.build_dir,
+                self.src_dir,
+            ]
+        )
+
+        # Compile step needs to satisfy the build directory that was previously
+        # prepared during setup.
+        self._run_cmd([meson, "compile", "-C", self.build_dir])
+
+        # Install step
+        self._run_cmd(
+            [meson, "install", "-C", self.build_dir, "--destdir", self.inst_dir]
+        )
+
+
 class CMakeBuilder(BuilderBase):
     MANUAL_BUILD_SCRIPT = """\
 #!{sys.executable}
diff --git a/build/fbcode_builder/getdeps/manifest.py b/build/fbcode_builder/getdeps/manifest.py
index d02cfe83f21..e329da1ee69 100644
--- a/build/fbcode_builder/getdeps/manifest.py
+++ b/build/fbcode_builder/getdeps/manifest.py
@@ -22,6 +22,7 @@
     NopBuilder,
     OpenSSLBuilder,
     SqliteBuilder,
+    SystemdBuilder,
 )
 from .cargo import CargoBuilder
 from .expr import parse_expr
@@ -661,6 +662,18 @@ def create_builder(  # noqa:C901
                 inst_dir,
             )
 
+        if builder == "systemd":
+            return SystemdBuilder(
+                loader,
+                dep_manifests,
+                build_options,
+                ctx,
+                self,
+                src_dir,
+                build_dir,
+                inst_dir,
+            )
+
         if builder == "cargo":
             return self.create_cargo_builder(
                 loader,
diff --git a/build/fbcode_builder/manifests/systemd b/build/fbcode_builder/manifests/systemd
index 40564970d7f..0fb2a6f5a51 100644
--- a/build/fbcode_builder/manifests/systemd
+++ b/build/fbcode_builder/manifests/systemd
@@ -4,3 +4,12 @@ name = systemd
 [rpms]
 systemd
 systemd-devel
+
+[download]
+url = https://github.com/systemd/systemd/archive/refs/tags/v256.7.tar.gz 
+sha256 = 896d76ff65c88f5fd9e42f90d152b0579049158a163431dd77cdc57748b1d7b0 
+
+
+[build]
+builder = systemd
+subdir = systemd-256.7