From 9e7b3e5dd0d950790c1cc44be8e4716a7ed2e8f2 Mon Sep 17 00:00:00 2001
From: Kirill Isakov <bootctl@gmail.com>
Date: Sat, 28 May 2022 19:13:44 +0600
Subject: [PATCH] Make build files compatible with muon

---
 INSTALL.md              | 16 ++++++++++++++--
 VERSION                 |  1 -
 meson.build             | 36 +++++++++++++++++++++---------------
 src/include/meson.build |  1 -
 test/meson.build        |  5 ++++-
 version.py              | 35 ++++-------------------------------
 6 files changed, 43 insertions(+), 51 deletions(-)
 delete mode 100644 VERSION

diff --git a/INSTALL.md b/INSTALL.md
index 7f1c6fab..4ba0bffd 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -1,14 +1,26 @@
 # Dependencies
 
+## Required
+
 Before you can start compiling tinc from a fresh git clone, you have
 to install the very latest versions of the following packages:
 
-- `meson`
-- `ninja`
+- `meson` or `muon` (read below)
+- `ninja` or `samurai`
 - `pkgconf` or `pkg-config`
 - `GCC` or `Clang` (any version with C11 support, although older versions might work)
 - `OpenSSL`\* (1.1.0+) or `LibreSSL` or `libgcrypt` (not needed if legacy protocol is disabled)
 
+### No Python?
+
+If you're on a constrained system that doesn't have (or cannot run) Python, you can try building tinc with [muon][muon],
+which is a pure C reimplementation of the same idea.
+Please note that `meson` is considered to be the main way of building tinc, and `muon` is supported on a best-effort basis.
+
+[muon]: https://git.sr.ht/~lattis/muon
+
+## Optional
+
 Plus a few optional dependencies. Support for them will be enabled if they're present:
 
 - `ncurses` or `PDCurses`
diff --git a/VERSION b/VERSION
deleted file mode 100644
index c0540cbd..00000000
--- a/VERSION
+++ /dev/null
@@ -1 +0,0 @@
-1.1pre18
diff --git a/meson.build b/meson.build
index 7354953d..15542198 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('tinc', 'c',
-  version: run_command([find_program('python3'), 'version.py', 'short'], check: true).stdout(),
+  version: '1.1pre18',
   license: 'GPL-2.0-or-later',
   meson_version: '>=0.51',
   default_options: [
@@ -36,11 +36,15 @@ os_name = host_machine.system()
 cpu_family = host_machine.cpu_family()
 cc_name = cc.get_id()
 
-python = find_program('python3')
-if meson_version.version_compare('>=0.55')
-  python_path = python.full_path()
+python = find_program('python3', required: false)
+if python.found()
+  if meson_version.version_compare('>=0.55')
+    python_path = python.full_path()
+  else
+    python_path = python.path()
+  endif
 else
-  python_path = python.path()
+  python_path = ''
 endif
 
 cc_defs = ['-D_GNU_SOURCE']
@@ -155,16 +159,18 @@ if os_name == 'linux' and not opt_systemd.disabled()
   subdir('systemd')
 endif
 
-run_target('reformat', command: [
-  python,
-  '@SOURCE_ROOT@/lint.py',
-  '--fix',
-])
-
-run_target('lint', command: [
-  python,
-  '@SOURCE_ROOT@/lint.py',
-])
+if python.found()
+  run_target('reformat', command: [
+    python,
+    '@SOURCE_ROOT@/lint.py',
+    '--fix',
+  ])
+
+  run_target('lint', command: [
+    python,
+    '@SOURCE_ROOT@/lint.py',
+  ])
+endif
 
 if meson_version.version_compare('>=0.53')
   summary({
diff --git a/src/include/meson.build b/src/include/meson.build
index f8e6f0d2..c192f186 100644
--- a/src/include/meson.build
+++ b/src/include/meson.build
@@ -2,7 +2,6 @@ configure_file(output: 'config.h', configuration: cdata)
 
 src_lib_common += vcs_tag(
   command: [python_path, src_root / 'version.py'],
-  fallback: 'unknown',
   input: '../version_git.h.in',
   output: 'version_git.h',
 )
diff --git a/test/meson.build b/test/meson.build
index 48e66898..60f4eeb0 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -1,3 +1,6 @@
-subdir('integration')
+if python.found()
+  subdir('integration')
+endif
+
 subdir('unit')
 
diff --git a/version.py b/version.py
index 3213e327..85f3b713 100755
--- a/version.py
+++ b/version.py
@@ -1,17 +1,9 @@
 #!/usr/bin/env python3
 
-"""Print current tinc version for using in build scripts.
-
-First try to determine the latest version using git tags. If this fails (because
-the .git directory is missing, git is not installed, or for some other reason),
-fall back to using the VERSION file. If it is not present or could not be read,
-use 'unknown'.
-"""
+"""Print current tinc version for using in build scripts."""
 
 from os import path, environ
-from sys import argv, stderr
 import subprocess as subp
-import typing as T
 
 PREFIX = "release-"
 SOURCE_ROOT = path.dirname(path.realpath(__file__))
@@ -27,25 +19,6 @@ cmd = [
     "--match=" + PREFIX + "*",
 ]
 
-if "short" in argv:
-    cmd.append("--abbrev=0")
-
-version: T.Optional[str] = None
-
-try:
-    result = subp.run(cmd, stdout=subp.PIPE, encoding="utf-8", check=False)
-    if not result.returncode:
-        version = result.stdout
-except FileNotFoundError:
-    pass
-
-if not version:
-    try:
-        with open(path.join(SOURCE_ROOT, "VERSION"), "r", encoding="utf-8") as f:
-            version = f.read().strip()
-    except OSError as e:
-        print("could not read version from file", e, file=stderr)
-elif version.startswith(PREFIX):
-    version = version[len(PREFIX) :].strip()
-
-print(version if version else "unknown", end="")
+result = subp.run(cmd, stdout=subp.PIPE, encoding="utf-8", check=True)
+version = result.stdout.strip().removeprefix("release-")
+print(version)
-- 
2.20.1