refactor: maintain dracut version in dracut.sh

Maintain the dracut version directly in `dracut.sh` and call
`dracut.sh --version` to get the version number. The version can be
changed with a simple sed command to a new version (for releases or for
distributors that want to include the packaging version):

```
sed -i "s/^DRACUT_VERSION=.*$/DRACUT_VERSION=\"${NEW_VERSION}\"/" dracut.sh
```

Fixes #2169
Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>

Makefile

@@ -1,13 +1,11 @@
--include dracut-version.sh
-
-DRACUT_MAIN_VERSION ?= $(shell env GIT_CEILING_DIRECTORIES=$(CURDIR)/.. git describe --abbrev=0 --tags --always 2>/dev/null || :)
-ifeq ($(DRACUT_MAIN_VERSION),)
-DRACUT_MAIN_VERSION = $(DRACUT_VERSION)
-endif
-DRACUT_FULL_VERSION ?= $(shell env GIT_CEILING_DIRECTORIES=$(CURDIR)/.. git describe --tags --always 2>/dev/null || :)
+DRACUT_FULL_VERSION ?= $(shell ./dracut.sh --version | cut -d' ' -f 2-)
 ifeq ($(DRACUT_FULL_VERSION),)
 DRACUT_FULL_VERSION = $(DRACUT_VERSION)
 endif
+DRACUT_MAIN_VERSION ?= $(shell echo "$(DRACUT_FULL_VERSION)" | sed 's/\([0-9]\+\).*/\1/')
+ifeq ($(DRACUT_MAIN_VERSION),)
+DRACUT_MAIN_VERSION = $(DRACUT_VERSION)
+endif
 
 HAVE_SHELLCHECK ?= $(shell command -v shellcheck >/dev/null 2>&1 && echo yes)
 HAVE_SHFMT ?= $(shell command -v shfmt >/dev/null  2>&1 && echo yes)
@@ -163,7 +161,6 @@ install: all
 	mkdir -p $(DESTDIR)$(pkglibdir)/dracut.conf.d
 	install -m 0755 dracut-init.sh $(DESTDIR)$(pkglibdir)/dracut-init.sh
 	install -m 0755 dracut-functions.sh $(DESTDIR)$(pkglibdir)/dracut-functions.sh
-	install -m 0755 dracut-version.sh $(DESTDIR)$(pkglibdir)/dracut-version.sh
 	ln -fs dracut-functions.sh $(DESTDIR)$(pkglibdir)/dracut-functions
 	install -m 0755 dracut-logger.sh $(DESTDIR)$(pkglibdir)/dracut-logger.sh
 	install -m 0755 dracut-initramfs-restore.sh $(DESTDIR)$(pkglibdir)/dracut-initramfs-restore

dracut.sh

@@ -18,6 +18,8 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
+DRACUT_VERSION="059"
+
 # store for logging
 
 unset BASH_ENV
@@ -36,13 +38,6 @@ readonly dracut_cmd=$(readlink -f "$0")
 set -o pipefail
 
 usage() {
-    [[ $sysroot_l ]] && dracutsysrootdir="$sysroot_l"
-    [[ $dracutbasedir ]] || dracutbasedir="$dracutsysrootdir"/usr/lib/dracut
-    if [[ -f $dracutbasedir/dracut-version.sh ]]; then
-        # shellcheck source=./dracut-version.sh
-        . "$dracutbasedir"/dracut-version.sh
-    fi
-
     #                                                   80x25 linebreak here ^
     cat << EOF
 Usage: $dracut_cmd [OPTION]... [<initramfs> [<kernel-version>]]
@@ -63,12 +58,6 @@ EOF
 }
 
 long_usage() {
-    [[ $dracutbasedir ]] || dracutbasedir="$dracutsysrootdir"/usr/lib/dracut
-    if [[ -f $dracutbasedir/dracut-version.sh ]]; then
-        # shellcheck source=./dracut-version.sh
-        . "$dracutbasedir"/dracut-version.sh
-    fi
-
     #                                                   80x25 linebreak here ^
     cat << EOF
 Usage: $dracut_cmd [OPTION]... [<initramfs> [<kernel-version>]]
@@ -292,15 +281,6 @@ For example:
 EOF
 }
 
-long_version() {
-    [[ $dracutbasedir ]] || dracutbasedir="$dracutsysrootdir"/usr/lib/dracut
-    if [[ -f $dracutbasedir/dracut-version.sh ]]; then
-        # shellcheck source=./dracut-version.sh
-        . "$dracutbasedir"/dracut-version.sh
-    fi
-    echo "dracut $DRACUT_VERSION"
-}
-
 # Fills up host_devs stack variable and makes sure there are no duplicates
 push_host_devs() {
     local _dev
@@ -854,7 +834,7 @@ while :; do
             machine_id_l="no"
             ;;
         --version)
-            long_version
+            echo "dracut $DRACUT_VERSION"
             exit 0
             ;;
         --)
@@ -1291,11 +1271,6 @@ if [[ $print_cmdline ]]; then
     kmsgloglvl=0
 fi
 
-if [[ -f $dracutbasedir/dracut-version.sh ]]; then
-    # shellcheck source=./dracut-version.sh
-    . "$dracutbasedir"/dracut-version.sh
-fi
-
 if systemd-detect-virt -c &> /dev/null; then
     export DRACUT_NO_MKNOD=1 DRACUT_NO_XATTR=1
     if [[ $hostonly ]]; then

tools/release.sh

@@ -41,13 +41,13 @@ cat NEWS_header.md NEWS_header_new.md NEWS_body_new.md NEWS_body_with_conttribut
 # message for https://github.com/dracutdevs/dracut/releases/tag
 cat -s NEWS_body_new.md CONTRIBUTORS.md > release.md
 
-# dracut-version.sh
-printf "#!/bin/sh\n# shellcheck disable=SC2034\nDRACUT_VERSION=%s\n" "$NEW_VERSION" > dracut-version.sh
+# Set new dracut version
+sed -i "s/^DRACUT_VERSION=.*$/DRACUT_VERSION=\"${NEW_VERSION}\"/" dracut.sh
 
 # Check in AUTHORS and NEWS.md
 git config user.name "Dracut Release Bot"
 git config user.email "<>"
-git commit -m "docs: update NEWS.md and AUTHORS" NEWS.md AUTHORS dracut-version.sh
+git commit -m "release dracut $NEW_VERSION" NEWS.md AUTHORS dracut.sh
 git push origin master
 git tag "$NEW_VERSION" -m "$NEW_VERSION"
 git push --tags