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

@@ -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: |

.gitignore

@@ -2,6 +2,7 @@
 .deps
 .dirstamp
 .libs
+.version
 *.la
 *.lo
 *.o

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
 #

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

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

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)

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