meta-digi-del: add '/etc/os-release' file

This file contains version and OS info.

https://jira.digi.com/browse/DEL-280 #resolve

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

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

@@ -0,0 +1,11 @@
+NAME="Digi Embedded Linux"
+VERSION="1.0.0 (for Danny)"
+ID=del
+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##

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

@@ -0,0 +1,24 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+PR_append = "+${DISTRO}.r0"
+
+SRC_URI += "file://os-release"
+
+TIMESTAMP  = "${@time.strftime('%Y%m%d%H%M')}"
+LAYERS_REV = "${@"Layers revisions:\n%s\n" % '\n'.join(get_layers_branch_rev(d))}"
+DEL_TAG    = "${@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.check_output(cmd, cwd=layer, shell=True)
+    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
+	printf "\n%s\n" "${LAYERS_REV}" >> ${D}${sysconfdir}/os-release
+}