image/rootfs-postcommands: Separate out post rootfs commands to separate class

Reading image.bbclass is a little difficult as it has many post rootfs
helper functions and its hard to separate those from the core contents
of the rootfs/image code.

Moving it to a separate class would be one way of making it clearer
what these functions are. There are some comment layout improvements
but no code changes.

(From OE-Core rev: df4cb51c8e60fa46d4d15be8da3d84287ff08ae7)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 258 insertions, 0 deletions

diff --git a/meta/classes/rootfs-postcommands.bbclass b/meta/classes/rootfs-postcommands.bbclass
new file mode 100644
index 0000000000..7c440acf00
--- /dev/null
+++ b/meta/classes/rootfs-postcommands.bbclass
@@ -0,0 +1,258 @@
+
+# Zap the root password if debug-tweaks feature is not enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains_any("IMAGE_FEATURES", [ 'debug-tweaks', 'empty-root-password' ], "", "zap_empty_root_password ; ",d)}'
+
+# Allow dropbear/openssh to accept logins from accounts with an empty password string if debug-tweaks is enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains_any("IMAGE_FEATURES", [ 'debug-tweaks', 'allow-empty-password' ], "ssh_allow_empty_password; ", "",d)}'
+
+# Enable postinst logging if debug-tweaks is enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains_any("IMAGE_FEATURES", [ 'debug-tweaks', 'post-install-logging' ], "postinst_enable_logging; ", "",d)}'
+
+# Create /etc/timestamp during image construction to give a reasonably sane default time setting
+ROOTFS_POSTPROCESS_COMMAND += "rootfs_update_timestamp ; "
+
+# Tweak the mount options for rootfs in /etc/fstab if read-only-rootfs is enabled
+ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("IMAGE_FEATURES", "read-only-rootfs", "read_only_rootfs_hook; ", "",d)}'
+
+# Write manifest
+IMAGE_MANIFEST = "${DEPLOY_DIR_IMAGE}/${IMAGE_NAME}.rootfs.manifest"
+ROOTFS_POSTUNINSTALL_COMMAND =+ "write_image_manifest ; "
+# Set default postinst log file
+POSTINST_LOGFILE ?= "${localstatedir}/log/postinstall.log"
+# Set default target for systemd images
+SYSTEMD_DEFAULT_TARGET ?= '${@bb.utils.contains("IMAGE_FEATURES", "x11-base", "graphical.target", "multi-user.target", d)}'
+ROOTFS_POSTPROCESS_COMMAND += '${@bb.utils.contains("DISTRO_FEATURES", "systemd", "set_systemd_default_target; ", "", d)}'
+
+ROOTFS_POSTPROCESS_COMMAND += 'empty_var_volatile;'
+
+# Disable DNS lookups, the SSH_DISABLE_DNS_LOOKUP can be overridden to allow
+# distros to choose not to take this change
+SSH_DISABLE_DNS_LOOKUP ?= " ssh_disable_dns_lookup ; "
+ROOTFS_POSTPROCESS_COMMAND_append_qemuall = "${SSH_DISABLE_DNS_LOOKUP}"
+
+
+
+#
+# A hook function to support read-only-rootfs IMAGE_FEATURES
+#
+read_only_rootfs_hook () {
+        # Tweak the mount option and fs_passno for rootfs in fstab
+        sed -i -e '/^[#[:space:]]*\/dev\/root/{s/defaults/ro/;s/\([[:space:]]*[[:digit:]]\)\([[:space:]]*\)[[:digit:]]$/\1\20/}' ${IMAGE_ROOTFS}/etc/fstab
+
+        # If we're using openssh and the /etc/ssh directory has no pre-generated keys,
+        # we should configure openssh to use the configuration file /etc/ssh/sshd_config_readonly
+        # and the keys under /var/run/ssh.
+        if [ -d ${IMAGE_ROOTFS}/etc/ssh ]; then
+                if [ -e ${IMAGE_ROOTFS}/etc/ssh/ssh_host_rsa_key ]; then
+                        echo "SYSCONFDIR=/etc/ssh" >> ${IMAGE_ROOTFS}/etc/default/ssh
+                        echo "SSHD_OPTS=" >> ${IMAGE_ROOTFS}/etc/default/ssh
+                else
+                        echo "SYSCONFDIR=/var/run/ssh" >> ${IMAGE_ROOTFS}/etc/default/ssh
+                        echo "SSHD_OPTS='-f /etc/ssh/sshd_config_readonly'" >> ${IMAGE_ROOTFS}/etc/default/ssh
+                fi
+        fi
+
+        # Also tweak the key location for dropbear in the same way.
+        if [ -d ${IMAGE_ROOTFS}/etc/dropbear ]; then
+                if [ -e ${IMAGE_ROOTFS}/etc/dropbear/dropbear_rsa_host_key ]; then
+                        echo "DROPBEAR_RSAKEY_DIR=/etc/dropbear" >> ${IMAGE_ROOTFS}/etc/default/dropbear
+                else
+                        echo "DROPBEAR_RSAKEY_DIR=/var/lib/dropbear" >> ${IMAGE_ROOTFS}/etc/default/dropbear
+                fi
+        fi
+
+
+        if ${@bb.utils.contains("DISTRO_FEATURES", "sysvinit", "true", "false", d)}; then
+                # Change the value of ROOTFS_READ_ONLY in /etc/default/rcS to yes
+                if [ -e ${IMAGE_ROOTFS}/etc/default/rcS ]; then
+                        sed -i 's/ROOTFS_READ_ONLY=no/ROOTFS_READ_ONLY=yes/' ${IMAGE_ROOTFS}/etc/default/rcS
+                fi
+                # Run populate-volatile.sh at rootfs time to set up basic files
+                # and directories to support read-only rootfs.
+                if [ -x ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh ]; then
+                        ${IMAGE_ROOTFS}/etc/init.d/populate-volatile.sh
+                fi
+        fi
+
+        if ${@bb.utils.contains("DISTRO_FEATURES", "systemd", "true", "false", d)}; then
+            # Update user database files so that services don't fail for a read-only systemd system
+            for conffile in ${IMAGE_ROOTFS}/usr/lib/sysusers.d/systemd.conf ${IMAGE_ROOTFS}/usr/lib/sysusers.d/systemd-remote.conf; do
+                [ -e $conffile ] || continue
+                grep -v "^#" $conffile | sed -e '/^$/d' | while read type name id comment; do
+                    if [ "$type" = "u" ]; then
+                        useradd_params=""
+                        [ "$id" != "-" ] && useradd_params="$useradd_params --uid $id"
+                        [ "$comment" != "-" ] && useradd_params="$useradd_params --comment $comment"
+                        useradd_params="$useradd_params --system $name"
+                        eval useradd --root ${IMAGE_ROOTFS} $useradd_params || true
+                    elif [ "$type" = "g" ]; then
+                        groupadd_params=""
+                        [ "$id" != "-" ] && groupadd_params="$groupadd_params --gid $id"
+                        groupadd_params="$groupadd_params --system $name"
+                        eval groupadd --root ${IMAGE_ROOTFS} $groupadd_params || true
+                    fi
+                done
+            done
+        fi
+}
+
+#
+# This function is intended to disallow empty root password if 'debug-tweaks' is not in IMAGE_FEATURES.
+#
+zap_empty_root_password () {
+        if [ -e ${IMAGE_ROOTFS}/etc/shadow ]; then
+                sed -i 's%^root::%root:*:%' ${IMAGE_ROOTFS}/etc/shadow
+        fi
+        if [ -e ${IMAGE_ROOTFS}/etc/passwd ]; then
+                sed -i 's%^root::%root:*:%' ${IMAGE_ROOTFS}/etc/passwd
+        fi
+} 
+
+#
+# allow dropbear/openssh to accept root logins and logins from accounts with an empty password string
+#
+ssh_allow_empty_password () {
+        if [ -e ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config ]; then
+                sed -i 's/^[#[:space:]]*PermitRootLogin.*/PermitRootLogin yes/' ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config
+                sed -i 's/^[#[:space:]]*PermitEmptyPasswords.*/PermitEmptyPasswords yes/' ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config
+        fi
+
+        if [ -e ${IMAGE_ROOTFS}${sbindir}/dropbear ] ; then
+                if grep -q DROPBEAR_EXTRA_ARGS ${IMAGE_ROOTFS}${sysconfdir}/default/dropbear 2>/dev/null ; then
+                        if ! grep -q "DROPBEAR_EXTRA_ARGS=.*-B" ${IMAGE_ROOTFS}${sysconfdir}/default/dropbear ; then
+                                sed -i 's/^DROPBEAR_EXTRA_ARGS="*\([^"]*\)"*/DROPBEAR_EXTRA_ARGS="\1 -B"/' ${IMAGE_ROOTFS}${sysconfdir}/default/dropbear
+                        fi
+                else
+                        printf '\nDROPBEAR_EXTRA_ARGS="-B"\n' >> ${IMAGE_ROOTFS}${sysconfdir}/default/dropbear
+                fi
+        fi
+
+        if [ -d ${IMAGE_ROOTFS}${sysconfdir}/pam.d ] ; then
+                sed -i 's/nullok_secure/nullok/' ${IMAGE_ROOTFS}${sysconfdir}/pam.d/*
+        fi
+}
+
+ssh_disable_dns_lookup () {
+        if [ -e ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config ]; then
+                sed -i -e 's:#UseDNS yes:UseDNS no:' ${IMAGE_ROOTFS}${sysconfdir}/ssh/sshd_config
+        fi
+}
+
+#
+# Enable postinst logging if debug-tweaks is enabled
+#
+postinst_enable_logging () {
+        mkdir -p ${IMAGE_ROOTFS}${sysconfdir}/default
+        echo "POSTINST_LOGGING=1" >> ${IMAGE_ROOTFS}${sysconfdir}/default/postinst
+        echo "LOGFILE=${POSTINST_LOGFILE}" >> ${IMAGE_ROOTFS}${sysconfdir}/default/postinst
+}
+
+#
+# Modify systemd default target
+#
+set_systemd_default_target () {
+        if [ -d ${IMAGE_ROOTFS}${sysconfdir}/systemd/system -a -e ${IMAGE_ROOTFS}${systemd_unitdir}/system/${SYSTEMD_DEFAULT_TARGET} ]; then
+                ln -sf ${systemd_unitdir}/system/${SYSTEMD_DEFAULT_TARGET} ${IMAGE_ROOTFS}${sysconfdir}/systemd/system/default.target
+        fi
+}
+
+# If /var/volatile is not empty, we have seen problems where programs such as the
+# journal make assumptions based on the contents of /var/volatile. The journal
+# would then write to /var/volatile before it was mounted, thus hiding the
+# items previously written.
+#
+# This change is to attempt to fix those types of issues in a way that doesn't
+# affect users that may not be using /var/volatile.
+empty_var_volatile () {
+        if [ -e ${IMAGE_ROOTFS}/etc/fstab ]; then
+                match=`awk '$1 !~ "#" && $2 ~ /\/var\/volatile/{print $2}' ${IMAGE_ROOTFS}/etc/fstab 2> /dev/null`
+                if [ -n "$match" ]; then
+                        find ${IMAGE_ROOTFS}/var/volatile -mindepth 1 -delete
+                fi
+        fi
+}
+
+# Turn any symbolic /sbin/init link into a file
+remove_init_link () {
+        if [ -h ${IMAGE_ROOTFS}/sbin/init ]; then
+                LINKFILE=${IMAGE_ROOTFS}`readlink ${IMAGE_ROOTFS}/sbin/init`
+                rm ${IMAGE_ROOTFS}/sbin/init
+                cp $LINKFILE ${IMAGE_ROOTFS}/sbin/init
+        fi
+}
+
+make_zimage_symlink_relative () {
+        if [ -L ${IMAGE_ROOTFS}/boot/zImage ]; then
+                (cd ${IMAGE_ROOTFS}/boot/ && for i in `ls zImage-* | sort`; do ln -sf $i zImage; done)
+        fi
+}
+
+insert_feed_uris () {
+        
+        echo "Building feeds for [${DISTRO}].."
+
+        for line in ${FEED_URIS}
+        do
+                # strip leading and trailing spaces/tabs, then split into name and uri
+                line_clean="`echo "$line"|sed 's/^[ \t]*//;s/[ \t]*$//'`"
+                feed_name="`echo "$line_clean" | sed -n 's/\(.*\)##\(.*\)/\1/p'`"
+                feed_uri="`echo "$line_clean" | sed -n 's/\(.*\)##\(.*\)/\2/p'`"
+                
+                echo "Added $feed_name feed with URL $feed_uri"
+                
+                # insert new feed-sources
+                echo "src/gz $feed_name $feed_uri" >> ${IMAGE_ROOTFS}/etc/opkg/${feed_name}-feed.conf
+        done
+}
+
+python write_image_manifest () {
+    from oe.rootfs import image_list_installed_packages
+    with open(d.getVar('IMAGE_MANIFEST', True), 'w+') as image_manifest:
+        image_manifest.write(image_list_installed_packages(d, 'ver'))
+        image_manifest.write("\n")
+}
+
+# Can be use to create /etc/timestamp during image construction to give a reasonably 
+# sane default time setting
+rootfs_update_timestamp () {
+        date -u +%4Y%2m%2d%2H%2M%2S >${IMAGE_ROOTFS}/etc/timestamp
+}
+
+# Prevent X from being started
+rootfs_no_x_startup () {
+        if [ -f ${IMAGE_ROOTFS}/etc/init.d/xserver-nodm ]; then
+                chmod a-x ${IMAGE_ROOTFS}/etc/init.d/xserver-nodm
+        fi
+}
+
+rootfs_trim_schemas () {
+        for schema in ${IMAGE_ROOTFS}/etc/gconf/schemas/*.schemas
+        do
+                # Need this in case no files exist
+                if [ -e $schema ]; then
+                        oe-trim-schemas $schema > $schema.new
+                        mv $schema.new $schema
+                fi
+        done
+}
+
+rootfs_check_host_user_contaminated () {
+        contaminated="${WORKDIR}/host-user-contaminated.txt"
+        HOST_USER_UID="$(PSEUDO_UNLOAD=1 id -u)"
+        HOST_USER_GID="$(PSEUDO_UNLOAD=1 id -g)"
+
+        find "${IMAGE_ROOTFS}" -wholename "${IMAGE_ROOTFS}/home" -prune \
+            -user "$HOST_USER_UID" -o -group "$HOST_USER_GID" >"$contaminated"
+
+        if [ -s "$contaminated" ]; then
+                echo "WARNING: Paths in the rootfs are owned by the same user or group as the user running bitbake. See the logfile for the specific paths."
+                cat "$contaminated" | sed "s,^,  ,"
+        fi
+}
+
+# Make any absolute links in a sysroot relative
+rootfs_sysroot_relativelinks () {
+        sysroot-relativelinks.py ${SDK_OUTPUT}/${SDKTARGETSYSROOT}
+}
+
+