systemd: support systemd-boot as a stand-alone EFI bootloader

The "systemd-boot" is gummiboot now included into systemd project.
The old gummiboot project supported in OE is dead.

Our intention is to get a gummiboot-like EFI bootloader without
much dependency on systemd and its features.

This work is largely derived from the existing bbclass and recipes
of gummiboot and systemd.
(commit tip: ee25d0e3987d7732a2e46e1640693b4cf419a9fc)

Please refer to the history up to the tip for authorship and
credit information for the original works.

To enable the systemd-boot in build, add this line
EFI_PROVIDER = "systemd-boot" in your machine conf file.

Signed-off-by: Jianxun Zhang <jianxun.zhang@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 124 insertions, 0 deletions

diff --git a/meta/classes/systemd-boot.bbclass b/meta/classes/systemd-boot.bbclass
new file mode 100644
index 0000000000..9e9398a2a5
--- /dev/null
+++ b/meta/classes/systemd-boot.bbclass
@@ -0,0 +1,124 @@
+# Copyright (C) 2016 Intel Corporation
+#
+# Released under the MIT license (see COPYING.MIT)
+
+# systemd-boot.bbclass - The "systemd-boot" is essentially the gummiboot merged into systemd.
+#                        The original standalone gummiboot project is dead without any more
+#                        maintenance. As a start point, we replace all gummitboot occurrences
+#                        with systemd-boot in gummiboot.bbclass to have a base version of this
+#                        systemd-boot.bbclass.
+#
+# Set EFI_PROVIDER = "systemd-boot" to use systemd-boot on your live images instead of grub-efi
+# (images built by image-live.bbclass or image-vm.bbclass)
+
+do_bootimg[depends] += "${MLPREFIX}systemd-boot:do_deploy"
+do_bootdirectdisk[depends] += "${MLPREFIX}systemd-boot:do_deploy"
+
+EFIDIR = "/EFI/BOOT"
+
+SYSTEMD_BOOT_CFG ?= "${S}/loader.conf"
+SYSTEMD_BOOT_ENTRIES ?= ""
+SYSTEMD_BOOT_TIMEOUT ?= "10"
+
+# Need UUID utility code.
+inherit fs-uuid
+
+efi_populate() {
+        DEST=$1
+
+        EFI_IMAGE="systemd-bootia32.efi"
+        DEST_EFI_IMAGE="bootia32.efi"
+        if [ "${TARGET_ARCH}" = "x86_64" ]; then
+            EFI_IMAGE="systemd-bootx64.efi"
+            DEST_EFI_IMAGE="bootx64.efi"
+        fi
+
+        install -d ${DEST}${EFIDIR}
+        # systemd-boot requires these paths for configuration files
+        # they are not customizable so no point in new vars
+        install -d ${DEST}/loader
+        install -d ${DEST}/loader/entries
+        install -m 0644 ${DEPLOY_DIR_IMAGE}/${EFI_IMAGE} ${DEST}${EFIDIR}/${DEST_EFI_IMAGE}
+        install -m 0644 ${SYSTEMD_BOOT_CFG} ${DEST}/loader/loader.conf
+        for i in ${SYSTEMD_BOOT_ENTRIES}; do
+            install -m 0644 ${i} ${DEST}/loader/entries
+        done
+}
+
+efi_iso_populate() {
+        iso_dir=$1
+        efi_populate $iso_dir
+        mkdir -p ${EFIIMGDIR}/${EFIDIR}
+        cp $iso_dir/${EFIDIR}/* ${EFIIMGDIR}${EFIDIR}
+        cp $iso_dir/vmlinuz ${EFIIMGDIR}
+        EFIPATH=$(echo "${EFIDIR}" | sed 's/\//\\/g')
+        echo "fs0:${EFIPATH}\\${DEST_EFI_IMAGE}" > ${EFIIMGDIR}/startup.nsh
+        if [ -f "$iso_dir/initrd" ] ; then
+            cp $iso_dir/initrd ${EFIIMGDIR}
+        fi
+}
+
+efi_hddimg_populate() {
+        efi_populate $1
+}
+
+python build_efi_cfg() {
+    s = d.getVar("S", True)
+    labels = d.getVar('LABELS', True)
+    if not labels:
+        bb.debug(1, "LABELS not defined, nothing to do")
+        return
+
+    if labels == []:
+        bb.debug(1, "No labels, nothing to do")
+        return
+
+    cfile = d.getVar('SYSTEMD_BOOT_CFG', True)
+    try:
+         cfgfile = open(cfile, 'w')
+    except OSError:
+        raise bb.build.funcFailed('Unable to open %s' % (cfile))
+
+    cfgfile.write('# Automatically created by OE\n')
+    cfgfile.write('default %s\n' % (labels.split()[0]))
+    timeout = d.getVar('SYSTEMD_BOOT_TIMEOUT', True)
+    if timeout:
+        cfgfile.write('timeout %s\n' % timeout)
+    else:
+        cfgfile.write('timeout 10\n')
+    cfgfile.close()
+
+    for label in labels.split():
+        localdata = d.createCopy()
+
+        overrides = localdata.getVar('OVERRIDES', True)
+        if not overrides:
+            raise bb.build.FuncFailed('OVERRIDES not defined')
+
+        entryfile = "%s/%s.conf" % (s, label)
+        d.appendVar("SYSTEMD_BOOT_ENTRIES", " " + entryfile)
+        try:
+            entrycfg = open(entryfile, "w")
+        except OSError:
+            raise bb.build.funcFailed('Unable to open %s' % (entryfile))
+        localdata.setVar('OVERRIDES', label + ':' + overrides)
+        bb.data.update_data(localdata)
+
+        entrycfg.write('title %s\n' % label)
+        entrycfg.write('linux /vmlinuz\n')
+
+        append = localdata.getVar('APPEND', True)
+        initrd = localdata.getVar('INITRD', True)
+
+        if initrd:
+            entrycfg.write('initrd /initrd\n')
+        lb = label
+        if label == "install":
+            lb = "install-efi"
+        entrycfg.write('options LABEL=%s ' % lb)
+        if append:
+            append = replace_rootfs_uuid(d, append)
+            entrycfg.write('%s' % append)
+        entrycfg.write('\n')
+        entrycfg.close()
+}