From cf0d7b4cd0c74e99655c1bc57e2ca5f6ea99ba03 Mon Sep 17 00:00:00 2001
From: Martin Pitt <martin@piware.de>
Date: Thu, 30 Jun 2022 19:46:40 +0200
Subject: [PATCH] Determine version dynamically from git

Ship a ./version file so that this also works when building from dist
tarballs. Add a little helper shell script to determine this.

This enables us to reduce the release process to merely pushing a signed
tag.
---
 .github/workflows/tests.yml |  3 +++
 .gitignore                  |  1 +
 meson.build                 |  4 +++-
 src/getversion.sh           | 15 +++++++++++++++
 tests/run-alpine            |  2 +-
 tests/run-gentoo            |  4 ++++
 tests/run-nix               |  3 ++-
 7 files changed, 29 insertions(+), 3 deletions(-)
 create mode 100755 src/getversion.sh

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index a8197429..a9328741 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -31,6 +31,9 @@ jobs:
     steps:
       - name: Clone repository
         uses: actions/checkout@v2
+        with:
+          # need this to also fetch tags
+          fetch-depth: 0
 
       - name: Run unit tests
         run: |
diff --git a/.gitignore b/.gitignore
index b052459e..a0848c48 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,6 +2,7 @@
 .deps
 .dirstamp
 .libs
+.version
 *.la
 *.lo
 *.o
diff --git a/meson.build b/meson.build
index 2ed90270..e977e84e 100644
--- a/meson.build
+++ b/meson.build
@@ -1,5 +1,5 @@
 project('umockdev', 'c', 'vala',
-  version: run_command('sed', '-rn', '1 { s/^.*\[([0-9.]+)\].*/\\1/; p }', 'NEWS', check: true).stdout().strip(),
+  version: run_command(meson.current_source_dir() / 'src' / 'getversion.sh', check: true).stdout().strip(),
   license: 'LGPLv2.1+')
 
 srcdir = meson.current_source_dir() / 'src'
@@ -44,6 +44,8 @@ if cc.has_function('__fxstatat', prefix: '#include <sys/stat.h>')
   add_project_arguments('-DHAVE_FXSTATAT', language: 'c')
 endif
 
+meson.add_dist_script(srcdir / 'getversion.sh')
+
 #
 # dependencies
 #
diff --git a/src/getversion.sh b/src/getversion.sh
new file mode 100755
index 00000000..0305852b
--- /dev/null
+++ b/src/getversion.sh
@@ -0,0 +1,15 @@
+#!/bin/sh
+ROOT=$(dirname $(dirname $(realpath "$0")))
+if [ -n "${MESON_SOURCE_ROOT:-}/.git" ] && VER=$(git -C "$MESON_SOURCE_ROOT" describe); then
+    # make version number distribution friendly
+    VER=$(echo "$VER" | sed 's/-/./g')
+    # when invoked as dist script, write the stamp; this is false when invoked from project.version()
+    [ -z "${MESON_DIST_ROOT:-}" ] || echo "$VER" > "${MESON_DIST_ROOT}/.version"
+    echo "$VER"
+# when invoked from a tarball, it should be in the source root
+elif [ -e "${ROOT}/.version" ]; then
+    cat "${ROOT}/.version"
+else
+    echo "ERROR: Neither a git checkout nor .version, cannot determine version" >&2
+    exit 1
+fi
diff --git a/tests/run-alpine b/tests/run-alpine
index 699e2bfd..f3ae9317 100755
--- a/tests/run-alpine
+++ b/tests/run-alpine
@@ -15,7 +15,7 @@ $RUNC run --interactive ${OPTS:-} --volume `pwd`:/source:ro ${1:-docker.io/alpin
 trap '[ \$? -eq 0 ] || exit 1' EXIT
 
 # install build dependencies
-apk add --no-cache meson gcc musl-dev glib-dev eudev-dev libpcap-dev make vala linux-headers xz usbutils ${EXTRA_PACKAGES:-}
+apk add --no-cache meson git gcc musl-dev glib-dev eudev-dev libpcap-dev make vala linux-headers xz usbutils ${EXTRA_PACKAGES:-}
 
 # run build as user
 adduser -D build
diff --git a/tests/run-gentoo b/tests/run-gentoo
index 5051057c..1b24f9ba 100755
--- a/tests/run-gentoo
+++ b/tests/run-gentoo
@@ -19,6 +19,10 @@ $RUNC run --interactive ${OPTS:-} \
   docker.io/gentoo/stage3 /bin/sh -eux <<EOF
 # install build dependencies
 ACCEPT_KEYWORDS="~*" emerge dev-util/umockdev --with-test-deps --onlydeps
+# install git, "meson dist" dependency
+emerge dev-vcs/git
+
+git config --global safe.directory /source
 
 cd /source
 export VALAC=\$(ls /usr/bin/valac-* |sort | tail -n1)
diff --git a/tests/run-nix b/tests/run-nix
index eeddb5d9..642393f1 100755
--- a/tests/run-nix
+++ b/tests/run-nix
@@ -26,8 +26,9 @@ in pkgs.umockdev.overrideAttrs (attrs: {
   preCheck = "";
   doCheck = true;
   nativeBuildInputs = attrs.nativeBuildInputs ++ [ ${DEBUG:+pkgs.breakpointHook} ];
+  # git is a "meson dist" time dependency
   # libpcap is a new dependency, it can be removed again later
-  buildInputs = attrs.buildInputs ++ [ pkgs.libpcap ];
+  buildInputs = attrs.buildInputs ++ [ pkgs.git pkgs.libpcap ];
 })
 EOG