nvme: Add git ref to the binary

In order to be able to figure out which binary is in use (for example
in debugging situation) it's really helpful to have the 'git describe'
ref added to the binary.

  $ .build/nvme --version
  nvme version 2.0 (git 2.0-2-gcbd3f8d+)

  $ .build/nvme wdc --version
  nvme wdc version 1.16.4 (git 2.0-2-gcbd3f8d+)

Signed-off-by: Daniel Wagner <[email protected]>

Author: igaw

meson-vcs-tag.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+set -eu
+set -o pipefail
+
+dir="${1:?}"
+fallback="${2:?}"
+
+# Apparently git describe has a bug where it always considers the work-tree
+# dirty when invoked with --git-dir (even though 'git status' is happy). Work
+# around this issue by cd-ing to the source directory.
+cd "$dir"
+# Check that we have either .git/ (a normal clone) or a .git file (a work-tree)
+# and that we don't get confused if a tarball is extracted in a higher-level
+# git repository.
+[ -e .git ] && git describe --abbrev=7 --dirty=+ 2>/dev/null | sed 's/^v//' || echo "$fallback"

meson.build

@@ -29,6 +29,17 @@ systemddir     = join_paths(prefixdir, get_option('systemddir'))
 conf = configuration_data()
 requires = ''
 
+version_tag = get_option('version-tag')
+if version_tag != ''
+        conf.set('GIT_VERSION', '"@0@"'.format(version_tag))
+else
+    r = run_command('meson-vcs-tag.sh',
+                    meson.current_source_dir(),
+                    meson.project_version(),
+                    check: true)
+    conf.set('GIT_VERSION', '"@0@"'.format(r.stdout().strip()))
+endif
+
 conf.set('SYSCONFDIR', '"@0@"'.format(sysconfdir))
 
 libnvme_dep = dependency('libnvme', fallback : ['libnvme', 'libnvme_dep'])

meson_options.txt

@@ -1,3 +1,4 @@
+option('version-tag', type : 'string', description : 'override the git version string')
 option('udevrulesdir', type : 'string', value : 'lib/udev/rules.d', description : 'directory for udev rules files')
 option('dracutrulesdir', type : 'string', value : 'lib/dracut/dracut.conf.d/', description : 'directory for dracut rules files')
 option('systemddir', type : 'string', value : 'lib/systemd/', description : 'directory for systemd files')

plugin.c

@@ -10,10 +10,13 @@ static int version(struct plugin *plugin)
 {
 	struct program *prog = plugin->parent;
 
-	if (plugin->name)
-		printf("%s %s version %s\n", prog->name, plugin->name, plugin->version);
-	else
-		printf("%s version %s\n", prog->name, prog->version);
+	if (plugin->name) {
+		printf("%s %s version %s (git %s)\n",
+			prog->name, plugin->name, plugin->version, GIT_VERSION);
+	} else {
+		printf("%s version %s (git %s)\n",
+		       prog->name, prog->version, GIT_VERSION);
+	}
 	return 0;
 }