image.bbclass: avoid boot error on read-only systemd image

The following changes since commit fcbd1b19383daf5e160a864df1418130da01be28:

build-appliance-image: Update to dizzy head revision (2014-10-11 08:11:11 +0100)

are available in the git repository at:

git://git.openembedded.org/openembedded-core-contrib ChenQi/systemd-read-only
http://cgit.openembedded.org/cgit.cgi/openembedded-core-contrib/log/?h=ChenQi/systemd-read-only

Chen Qi (1):
image.bbclass: avoid boot error on read-only systemd image

 meta/classes/image.bbclass | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

1.9.1

New version of systemd implements a new feature of updating /etc or /var when needed at boot. For details, please see link below.

Opointer.de/blog/projects/stateless.html

For now, at boot time, the systemd-sysusers.service would update user database files (/etc/passwd, /etc/group, etc.) according to the configuration files under /usr/lib/sysusers.d. This step is necessary for other systemd services to work correctly. Examples of such services are systemd-resolved and systemd-tmpfiles-setup.

The problem is that on a read-only file system, that is, if /etc is read-only, the user database files could not be updated, causing failures of services.

This patch fixes this problem by adding users/groups at rootfs time.

---
 meta/classes/image.bbclass | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

index 940bdb6..56109a0 100644
@@ -225,6 +225,27 @@ read_only_rootfs_hook () {
 			fi
 		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
 }
 
 PACKAGE_EXCLUDE ??= ""

1.9.1

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