AppImage: AppImage builder

.github/workflows/release.yml

@@ -0,0 +1,32 @@
+name: Release
+
+# Run on all tags
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  runtime_builder:
+    name: Runtime ${{ matrix.cfg.id }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        cfg:
+          - { id: x86_64,    img: alpine       }
+          - { id: i386 ,     img: i386/alpine  }
+    container: ${{ matrix.cfg.img }}:latest
+
+  steps:
+    - uses: actions/checkout@v2
+    - name: Building ${{ matrix.cfg.id }} Meson runtime
+      run: ./packaging/appimage/build_${{ matrix.cfg.id }}.sh
+    - name: Upload binaries to release
+      uses: svenstaro/upload-release-action@v2
+      with:
+        repo_token: ${{ secrets.GITHUB_TOKEN }}
+        file: appimage/meson-${{ matrix.cfg.id }}.runtime
+        tag: ${{ github.ref }}
+        overwrite: true
+        body: ${{ github.ref }}

.gitignore

@@ -21,9 +21,11 @@ __pycache__
 .DS_Store
 *~
 *.swp
+meson*.runtime
 packagecache
 /MANIFEST
 /build
+/appimage
 /dist
 /meson.egg-info
 

mesonbuild/mesonlib/universal.py

@@ -219,7 +219,9 @@ def set_meson_command(mainfile: str) -> None:
     global _meson_command
     # On UNIX-like systems `meson` is a Python script
     # On Windows `meson` and `meson.exe` are wrapper exes
-    if not mainfile.endswith('.py'):
+    if 'MESON_COMMAND' in os.environ:
+        _meson_command = shlex.split(os.environ['MESON_COMMAND'])
+    elif not mainfile.endswith('.py'):
         _meson_command = [mainfile]
     elif os.path.isabs(mainfile) and mainfile.endswith('mesonmain.py'):
         # Can't actually run meson with an absolute path to mesonmain.py, it must be run as -m mesonbuild.mesonmain

mesonbuild/msetup.py

@@ -17,12 +17,16 @@
 import sys, stat
 import datetime
 import os.path
+import os
 import platform
 import cProfile as profile
 import argparse
 import tempfile
 import shutil
 import glob
+import subprocess
+
+from pathlib import Path
 
 from . import environment, interpreter, mesonlib
 from . import build
@@ -74,6 +78,20 @@ def __init__(self, options: argparse.Namespace) -> None:
                                                                options.sourcedir,
                                                                options.reconfigure,
                                                                options.wipe)
+        # Detect if we are running from the AppImage runtime. Then self-extract
+        # and relaunch with the extracted binaries
+        if 'APPIMAGE' in os.environ:
+            rc = subprocess.run([os.environ['APPIMAGE'], '--runtime-setup', self.build_dir]).returncode
+            if rc == 0:
+                del os.environ['APPIMAGE']  # avoid infinite loops
+                del os.environ['APPDIR']
+                meson_exe = Path(self.build_dir) / 'meson-runtime' / 'fakebin' / 'meson'
+                meson_exe = meson_exe.resolve()
+                os.execve(meson_exe.as_posix(), [meson_exe.as_posix(), *sys.argv[1:]], os.environ)
+                # execve never returns. See `man 3 exec`.
+
+            mlog.warning('Failed to self extract', mlog.bold(os.environ['APPIMAGE']), 'to', mlog.bold(options.builddir), f'(rc = {rc})')
+
         if options.wipe:
             # Make a copy of the cmd line file to make sure we can always
             # restore that file if anything bad happens. For example if