new module to format newroot's /tmp

Uses SLX_TMP_PARTITION_IDENTIFIER from the openslx configuration file to detect which partition to format.
Formatting is done either by the command in SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND, if set, or by either mkfs.xfs or mkfs.ext4 as fallbacks

2 files changed, 54 insertions, 0 deletions

diff --git a/builder/modules.d/openslx_tmp_format/module-setup.sh b/builder/modules.d/openslx_tmp_format/module-setup.sh
new file mode 100755
index 00000000..c20eb1dd
--- /dev/null
+++ b/builder/modules.d/openslx_tmp_format/module-setup.sh
@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+
+check() {
+	# Tell dracut that this module should only be included if it is required
+	# explicitly.
+	return 255
+}
+depends() {
+	echo dnbd3-rootfs
+}
+install() {
+	# must be *after* the download of the openslx config
+	# which is currently 00-fetch-config.sh
+	inst_hook pre-mount 10 "$moddir/scripts/format_openslx_tmp.sh"
+	inst_multiple mkfs.xfs mkfs.ext4
+}
diff --git a/builder/modules.d/openslx_tmp_format/scripts/format_openslx_tmp.sh b/builder/modules.d/openslx_tmp_format/scripts/format_openslx_tmp.sh
new file mode 100755
index 00000000..26b6cb81
--- /dev/null
+++ b/builder/modules.d/openslx_tmp_format/scripts/format_openslx_tmp.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+#
+# Formats the partition used for "${NEWROOT}/tmp"
+# using filesystem given as SLX_TMP_PARTITION_FILESYSTEM
+# if possible. If not, it tries xfs and ext4 as fallbacks.
+
+command -v emergency_shell >/dev/null || source /lib/dracut-lib.sh
+
+. /etc/openslx
+
+if [ -z "${SLX_TMP_PARTITION_IDENTIFIER}" ]; then
+	emergency_shell "[${BASH_SOURCE[0]}] \
+		SLX_TMP_PARTITION_IDENTIFIER not set!"
+fi
+SLX_TMP_PARTITION_DEVICE="/dev/disk/by-partlabel/${SLX_TMP_PARTITION_IDENTIFIER}"
+if [ ! -b "$(readlink -f ${SLX_TMP_PARTITION_DEVICE})" ]; then
+	emergency_shell "[${BASH_SOURCE[0]}] \
+		'${SLX_TMP_PARTITION_DEVICE}' does not point to a block device"
+fi
+
+if [ -z "${SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND}" ] || \
+		! command -v "${SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND%%\ *}" >/dev/null; then
+	if command -v mkfs.xfs >/dev/null; then
+		SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND="mkfs.xfs -f"
+	elif command -v mkfs.ext4 >/dev/null; then
+		SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND="mkfs.ext4 -F"
+	else
+		emergency_shell "[${BASH_SOURCE[0]}] No suitable mkfs command found!"
+	fi
+fi
+
+if ! ${SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND} "${SLX_TMP_PARTITION_DEVICE}"; then
+	emergency_shell "[${BASH_SOURCE[0]}] \
+		Failed to format '${SLX_TMP_PARTITION_DEVICE}' using: \
+		${SLX_TMP_PARTITION_FILESYSTEM_CREATE_COMMAND}"
+fi
+
+exit 0