[PATCH 3/6] meta/classes: add image-locales-extension class

[claudius.heine.ext@siemens.com]

From: Claudius Heine <ch@denx.de>

This class allows to configure the locales of the image and also uses
'localepurge' to remove unwanted locales.

The locale can be configured the same way as with the
isar-cfg-localepurge package, via the `LOCALE_GEN` and `LOCALE_DEFAULT`
variables.

Signed-off-by: Claudius Heine <ch@denx.de>
---
 meta/classes/image-locales-extension.bbclass | 97 ++++++++++++++++++++
 meta/classes/image.bbclass                   |  1 +
 meta/classes/rootfs.bbclass                  |  4 +
 3 files changed, 102 insertions(+)
 create mode 100644 meta/classes/image-locales-extension.bbclass

diff --git a/meta/classes/image-locales-extension.bbclass b/meta/classes/image-locales-extension.bbclass
new file mode 100644
index 0000000..3c0758f
--- /dev/null
+++ b/meta/classes/image-locales-extension.bbclass
@@ -0,0 +1,97 @@
+# This software is a part of ISAR.
+# Copyright (C) Siemens AG, 2019
+#
+# SPDX-License-Identifier: MIT
+#
+# This class extends the image.bbclass for setting locales and purging unneeded
+# ones.
+
+LOCALE_GEN ?= "en_US.UTF-8 UTF-8\n\
+               en_US ISO-8859-1\n"
+LOCALE_DEFAULT ?= "en_US.UTF-8"
+
+def get_locale_gen(d, sep='\n'):
+    locale_gen = d.getVar("LOCALE_GEN", True) or ""
+    return sep.join(sorted(set(i.strip()
+                               for i in locale_gen.split('\\n')
+                               if i.strip())))
+
+def get_nopurge(d):
+    locale_gen = d.getVar("LOCALE_GEN", True) or ""
+    return '\n'.join(sorted(set(i.strip()
+                                for j in locale_gen.split('\\n')
+                                if j.strip()
+                                for i in (j.split()[0].split("_")[0],
+                                          j.split()[0].split(".")[0],
+                                          j.split()[0]))))
+
+ROOTFS_INSTALL_COMMAND_BEFORE_CLEAN += "image_install_localepurge_download"
+image_install_localepurge_download[weight] = "40"
+image_install_localepurge_download() {
+    sudo -E chroot '${ROOTFSDIR}' \
+        /usr/bin/apt-get ${ROOTFS_APT_ARGS} --download-only localepurge
+}
+
+ROOTFS_INSTALL_COMMAND += "image_install_localepurge_install"
+image_install_localepurge_install[weight] = "700"
+image_install_localepurge_install() {
+
+    # Generate locale and localepurge configuration:
+    cat<<__EOF__ > ${WORKDIR}/locale.gen
+${@get_locale_gen(d)}
+__EOF__
+    cat<<__EOF__ > ${WORKDIR}/locale.debconf
+locales     locales/locales_to_be_generated    multiselect ${@get_locale_gen(d, ', ')}
+locales     locales/default_environment_locale select      ${LOCALE_DEFAULT}
+__EOF__
+    cat<<__EOF__ > ${WORKDIR}/locale.default
+LANG=${LOCALE_DEFAULT}
+__EOF__
+    cat<<__EOF__ > ${WORKDIR}/locale.nopurge
+#USE_DPKG
+MANDELETE
+DONTBOTHERNEWLOCALE
+#SHOWFREEDSPACE
+#QUICKNDIRTYCALC
+#VERBOSE
+${@get_nopurge(d)}
+__EOF__
+
+    # Install configuration into image:
+    sudo -E -s <<'EOSUDO'
+        cat '${WORKDIR}/locale.gen' >> '${ROOTFSDIR}/etc/locale.gen'
+        cat '${WORKDIR}/locale.default' > '${ROOTFSDIR}/etc/default/locale'
+        cat '${WORKDIR}/locale.nopurge' > '${ROOTFSDIR}/etc/locale.nopurge'
+        cat '${WORKDIR}/locale.debconf' > '${ROOTFSDIR}/tmp/locale.debconf'
+
+        # Enter image and trigger locales config and localepurge:
+        chroot '${ROOTFSDIR}' /bin/sh <<'EOSH'
+            localepurge_state='i'
+            if dpkg -s localepurge 2>/dev/null >&2
+            then
+                echo 'localepurge was installed (leaving it installed later)'
+            else
+                localepurge_state='p'
+                echo 'localepurge was not installed (removing it later)'
+                apt-get ${ROOTFS_APT_ARGS} localepurge
+            fi
+
+            echo 'running locale debconf-set-selections'
+            debconf-set-selections /tmp/locale.debconf
+            rm -f '/tmp/locale.debconf'
+
+            echo 'reconfigure locales'
+            dpkg-reconfigure -f noninteractive locales
+
+            echo 'running localepurge'
+            localepurge
+
+            if [ "$localepurge_state" = 'p' ]
+            then
+                echo removing localepurge...
+                apt-get purge --yes localepurge 
+                apt-get autoremove --purge --yes
+            fi
+EOSH
+EOSUDO
+}
diff --git a/meta/classes/image.bbclass b/meta/classes/image.bbclass
index 89dc5e4..c1ae4f6 100644
--- a/meta/classes/image.bbclass
+++ b/meta/classes/image.bbclass
@@ -60,6 +60,7 @@ inherit image-sdk-extension
 inherit image-cache-extension
 inherit image-tools-extension
 inherit image-postproc-extension
+inherit image-locales-extension
 
 # Extra space for rootfs in MB
 ROOTFS_EXTRA ?= "64"
diff --git a/meta/classes/rootfs.bbclass b/meta/classes/rootfs.bbclass
index 0fc8ba8..5736eee 100644
--- a/meta/classes/rootfs.bbclass
+++ b/meta/classes/rootfs.bbclass
@@ -99,6 +99,7 @@ rootfs_install_pkgs_update() {
         -o Dir::Etc::sourceparts="-" \
         -o APT::Get::List-Cleanup="0"
 }
+
 ROOTFS_INSTALL_COMMAND += "rootfs_install_resolvconf"
 rootfs_install_resolvconf[weight] = "1"
 rootfs_install_resolvconf() {
@@ -112,6 +113,9 @@ rootfs_install_pkgs_download() {
         /usr/bin/apt-get ${ROOTFS_APT_ARGS} --download-only ${ROOTFS_PACKAGES}
 }
 
+ROOTFS_INSTALL_COMMAND_BEFORE_CLEAN ??= ""
+ROOTFS_INSTALL_COMMAND += "${ROOTFS_INSTALL_COMMAND_BEFORE_CLEAN}"
+
 ROOTFS_INSTALL_COMMAND += "${@ 'rootfs_install_clean_files' if (d.getVar('ROOTFS_CLEAN_FILES') or '').strip() else ''}"
 rootfs_install_clean_files[weight] = "2"
 rootfs_install_clean_files() {
-- 
2.20.1