Initial commit

meta-phosphor/recipes-phosphor/preinit-mounts/preinit-mounts.bb

@@ -0,0 +1,24 @@
+LICENSE = "Apache-2.0"
+LIC_FILES_CHKSUM = "file://${COREBASE}/meta/files/common-licenses/Apache-2.0;md5=89aea4e17d99a7cacdbeed46a0096b10"
+
+SRC_URI += "file://init"
+
+inherit allarch
+inherit update-alternatives
+
+do_install() {
+        install -d ${D}/${base_sbindir}
+        install -m 0755 ${WORKDIR}/init ${D}/${base_sbindir}/preinit-mounts
+}
+
+RDEPENDS:${PN} += "${VIRTUAL-RUNTIME_base-utils}"
+
+FILES:${PN} += "${base_sbindir}/init"
+
+ALTERNATIVE_LINK_NAME[init] = "${base_sbindir}/init"
+# Use a number higher than the systemd init alternative so that
+# ours is enabled instead.
+ALTERNATIVE_PRIORITY[init] ?= "400"
+
+ALTERNATIVE:${PN} = "init"
+ALTERNATIVE_TARGET[init] = "${base_sbindir}/preinit-mounts"

meta-phosphor/recipes-phosphor/preinit-mounts/preinit-mounts/init

@@ -0,0 +1,63 @@
+#!/bin/sh
+
+mount_overlay() {
+    if ! mount overlay /etc -t overlay -o defaults,lowerdir=/etc,upperdir=/var/persist/etc,workdir=/var/persist/etc-work; then
+        mount overlay /etc -t overlay -o defaults,lowerdir=/etc:/var/persist/etc
+    fi
+}
+
+recreate_overlay() {
+    # Attempt to re-create the overlay by moving out the overlay contents and
+    # copying them back to /etc, which would create them back in the overlay
+    cd /
+    if ! umount /etc; then
+        return
+    fi
+    rm -rf /var/persist/etc-save
+    mv /var/persist/etc /var/persist/etc-save
+    mkdir -p /var/persist/etc
+    mount_overlay
+    cp -rp /var/persist/etc-save/* /etc/
+    rm -rf /var/persist/etc-save
+}
+
+if ! mount ubi0:rwfs /var -t ubifs -o defaults; then
+    if ! mount ubi0:rwfs /var -t ubifs -o defaults,ro; then
+        mount tmpfs /var -t tmpfs -o defaults
+    fi
+fi
+
+mkdir -p /var/persist/etc /var/persist/etc-work /var/persist/home/root
+
+rm -rf /var/persist/etc-work/*
+# rm -rf specifically skips . and .. directories; pipe all output to null to avoid the error message
+rm -rf /var/persist/etc-work/.* > /dev/null 2>&1
+
+mount_overlay
+
+# Check if there are any issues accessing the files in /etc after mounting the
+# overlay by doing an 'ls' command
+error="/var/overlay-error"
+recreate_overlay_done=
+files=$(find /var/persist/etc -type f | sed 's#/var/persist/etc/##')
+for i in $files; do
+    ls -i "/etc/$i" >/dev/null 2>${error};
+    if [ -s ${error} ]; then
+        # We don't have a way to print this error to the journal, delete it
+        rm -f ${error}
+        if test -n "$recreate_overlay_done"; then
+            recreate_overlay
+            recreate_overlay_done="true"
+        fi
+        # Check file once more
+        ls -i "/etc/$i" >/dev/null 2>${error};
+        if [ -s ${error} ]; then
+            # File still corrupted, delete it from the overlay
+            echo "Removing corrupted file from overlay: $i"
+            rm -f ${error}
+            rm -f "/var/persist/etc/$i"
+        fi
+    fi
+done
+
+exec /lib/systemd/systemd