meson: make kernel-install a template file, add --version, add to tests

In --help output, change "$0" → "kernel-install". We generally don't include
the full path in --help output, and let's not do this here either.

kernel-install is now in build/ directly, not in the subdirectory.

src/kernel-install/kernel-install.in

@@ -23,11 +23,12 @@ skip_remaining=77
 usage()
 {
     echo "Usage:"
-    echo "  $0 [OPTIONS...] add KERNEL-VERSION KERNEL-IMAGE [INITRD-FILE ...]"
-    echo "  $0 [OPTIONS...] remove KERNEL-VERSION"
-    echo "  $0 [OPTIONS...] inspect"
+    echo "  kernel-install [OPTIONS...] add KERNEL-VERSION KERNEL-IMAGE [INITRD-FILE...]"
+    echo "  kernel-install [OPTIONS...] remove KERNEL-VERSION"
+    echo "  kernel-install [OPTIONS...] inspect"
     echo "Options:"
-    echo "  -h, --help     Print this help"
+    echo "  -h, --help     Print this help and exit"
+    echo "      --version  Print version string and exit"
     echo "  -v, --verbose  Increase verbosity"
 }
 
@@ -59,6 +60,13 @@ for i; do
     fi
 done
 
+for i; do
+    if [ "$i" = "--version" ]; then
+        echo "kernel-install {{PROJECT_VERSION}} ({{GIT_VERSION}})"
+        exit 0
+    fi
+done
+
 export KERNEL_INSTALL_VERBOSE=0
 if [ "$1" = "--verbose" ] || [ "$1" = "-v" ]; then
     shift

src/kernel-install/meson.build

@@ -1,10 +1,8 @@
 # SPDX-License-Identifier: LGPL-2.1-or-later
 
-if want_kernel_install
-        install_data('kernel-install',
-                     install_mode : 'rwxr-xr-x',
-                     install_dir : bindir)
+kernel_install_in = files('kernel-install.in')
 
+if want_kernel_install
         install_data('50-depmod.install',
                      '90-loaderentry.install',
                      install_mode : 'rwxr-xr-x',