base-files: rework '/etc/os-release' file

* Do not hard-code the DISTRO* values and set them from the environment
* Move the build information to a different file (following commit)

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-del/recipes-core/base-files/base-files/os-release

@@ -1,11 +1,6 @@
-NAME="Digi Embedded Linux"
-VERSION="1.0.0 (for Danny)"
-ID=del
+NAME="##DISTRO_NAME##"
+VERSION="##DISTRO_VERSION##"
+ID=##DISTRO##
 ID_LIKE=yocto
-VERSION_ID="1.0.0"
-PRETTY_NAME="Digi Embedded Linux 1.0.0 (for Danny)"
-
-BUILD CONFIGURATION
-===================
-BUILD_TIMESTAMP=##BUILD_TIMESTAMP##
-DEL_TAG=##DEL_TAG##
+VERSION_ID="##DISTRO_VERSION##"
+PRETTY_NAME="##DISTRO_NAME## ##DISTRO_VERSION##"

meta-digi-del/recipes-core/base-files/base-files_3.0.14.bbappend

@@ -6,29 +6,16 @@ PR_append = "+${DISTRO}"
 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
 
 SRC_URI += " \
-	file://os-release \
-	file://sysctl.conf \
+    file://os-release \
+    file://sysctl.conf \
 "
 
-TIMESTAMP  = "${@time.strftime('%Y%m%d%H%M')}"
-LAYERS_REV = "${@"\nLayers revisions:\n%s\n" % '\n'.join(get_layers_branch_rev(d))}"
-DEL_TAG    = "${@del_tag(d).strip()}"
-
-def del_tag(d):
-    import subprocess
-    for layer in d.getVar('BBLAYERS', True).split():
-        if 'meta-digi-del' in layer:
-            cmd = 'git describe --tags --exact-match 2>/dev/null || true'
-            return subprocess.Popen(cmd, cwd=layer, shell=True, stdout=subprocess.PIPE).stdout.read()
-    return ""
-
 do_install_append() {
 	install -m 0644 ${WORKDIR}/os-release ${D}${sysconfdir}/
-	sed -i -e 's,##DEL_TAG##,${DEL_TAG},g' ${D}${sysconfdir}/os-release
-	sed -i -e 's,##BUILD_TIMESTAMP##,${TIMESTAMP},g' ${D}${sysconfdir}/os-release
-	cat >> ${D}${sysconfdir}/os-release <<-EOF
-		${LAYERS_REV}
-	EOF
+	sed -i  -e 's,##DISTRO##,${DISTRO},g' \
+		-e 's,##DISTRO_NAME##,${DISTRO_NAME},g' \
+		-e 's,##DISTRO_VERSION##,${DISTRO_VERSION},g' \
+		${D}${sysconfdir}/os-release
 	install -m 0644 ${WORKDIR}/sysctl.conf ${D}${sysconfdir}/
 }