Preserve Linux capabilities when running tar, and misc fixes for mkrootfs. (#92)

* Preserve Linux capabilities in various tar invocations.

Otherwise, ping as non-root will not work when using a Void image.

Don't try to umount pseudofilesystems when $rootfs is undefined.
On mktemp failure, die in the script itself, not the $( ... ) subshell.
And remove the second FATAL: from the error message.

installer.sh.in

@@ -1116,15 +1116,14 @@ log_and_count() {
 }
 
 copy_rootfs() {
-    local tar_in="--create --one-file-system"
-    local tar_out="--extract --preserve-permissions"
+    local tar_in="--create --one-file-system --xattrs"
     TITLE="Check $LOG for details ..."
     INFOBOX "Counting files, please be patient ..." 4 60
     copy_total=$(tar ${tar_in} -v -f /dev/null / 2>/dev/null | wc -l)
     export copy_total copy_count=0 copy_progress=
     clear
     tar ${tar_in} -f - / 2>/dev/null | \
-        tar ${tar_out} -v -f - -C $TARGETDIR | \
+        tar --extract --xattrs --xattrs-include='*' --preserve-permissions -v -f - -C $TARGETDIR | \
         log_and_count | \
         DIALOG --title "${TITLE}" \
             --progressbox "Copying live image to target rootfs." 5 60

mkimage.sh.in

@@ -179,7 +179,7 @@ if [ "$PLATFORM" = "beaglebone" ]; then
     touch $ROOTFSDIR/boot/uEnv.txt
     umount $ROOTFSDIR/boot
 fi
-tar xfp $ROOTFS_TARBALL -C $ROOTFSDIR
+tar xfp $ROOTFS_TARBALL --xattrs --xattrs-include='*' -C $ROOTFSDIR
 
 fspassno="1"
 if [ "$ROOT_FSTYPE" = "f2fs" ]; then

mkrootfs.sh.in

@@ -69,9 +69,11 @@ mount_pseudofs() {
 }
 
 umount_pseudofs() {
-    for f in dev proc sys; do
-        umount -f $rootfs/$f >/dev/null 2>&1
-    done
+    if [ -d "${rootfs}" ]; then
+        for f in dev proc sys; do
+            umount -f $rootfs/$f >/dev/null 2>&1
+        done
+    fi
 }
 
 run_cmd_target() {
@@ -192,7 +194,7 @@ fi
 #
 # Check if package base-system is available.
 #
-rootfs=$(mktemp -d || die "FATAL: failed to create tempdir, exiting...")
+rootfs=$(mktemp -d) || die "failed to create tempdir, exiting..."
 mkdir -p $rootfs/var/db/xbps/keys
 cp keys/*.plist $rootfs/var/db/xbps/keys
 
@@ -264,7 +266,7 @@ if [ -n "${_ARCH}" ]; then
 fi
 
 tarball=void-${PLATFORM}-rootfs-$(date '+%Y%m%d').tar.xz
-run_cmd "tar -cp --posix -C $rootfs . | xz -T0 -9 > $tarball "
+run_cmd "tar -cp --posix --xattrs -C $rootfs . | xz -T0 -9 > $tarball "
 
 rm -rf $rootfs