From b67ced0f2eac48387ce46cb5b5ea9dfe0eb210ee Mon Sep 17 00:00:00 2001
From: Andreas Hrubak <ad132454@uucp.hu>
Date: Tue, 30 Jul 2024 16:58:03 +0200
Subject: [PATCH] add new mount helper (virtual fstype) : mount.abshelper

---
 mount/Makefile        |  5 ++++-
 mount/mount.abshelper | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100755 mount/mount.abshelper

diff --git a/mount/Makefile b/mount/Makefile
index 83d989e..20181b8 100644
--- a/mount/Makefile
+++ b/mount/Makefile
@@ -1,5 +1,5 @@
 
-TOOLS = mount.bindfs mount.posixovlfs mount.xattrovlfs mount.fusefile \
+TOOLS = mount.bindfs mount.posixovlfs mount.xattrovlfs mount.fusefile mount.abshelper \
   mount.restic
 
 TARGETS = $(foreach name,$(TOOLS),/sbin/$(name))
@@ -15,3 +15,6 @@ install-all: $(TARGETS)
 $(TARGETS): /sbin/%: %
 	install --compare $< $@
 	@echo remove $@ >> uninstall.sh
+
+
+# TODO: discover usage of /sbin/fs.d and /sbin/fs directories.
diff --git a/mount/mount.abshelper b/mount/mount.abshelper
new file mode 100755
index 0000000..9136a2c
--- /dev/null
+++ b/mount/mount.abshelper
@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# this wrapper mount script makes relative device paths to absolute.
+# some mount fs types needs them to be absolute, but I'd like to keep
+# the option to be able to mount different devices in different directories,
+# only their relative paths being the same.
+
+set -e
+set -u
+
+mount_opts=()
+
+dev=$1
+shift
+moutpoint=$1
+shift
+
+while [ $# -gt 0 ]
+do
+	case "$1" in
+	(-t)
+		shift
+		fstype=$1
+		if [[ $fstype =~ abshelper\.(.+) ]]
+		then
+			fstype_encoded=${BASH_REMATCH[1]}
+			fstype=${fstype_encoded//\//.}
+		fi
+		if [[ $fstype =~ ([^.]+) ]]
+		then
+			fstype_master=${BASH_REMATCH[1]}
+		else
+			fstype_master=$fstype
+		fi
+		;;
+	(*)
+		mount_opts+=("$1")
+		;;
+	esac
+	shift
+done
+
+if [ "${dev:0:1}" != / ]
+then
+	dev=$PWD/$dev
+fi
+
+exec /sbin/"mount.$fstype_master" "$dev" "$moutpoint" -t "$fstype" "${mount_opts[@]}"
-- 
2.11.4.GIT