Makefile: Create storage symlink as relative

Resolves: #1575
Signed-off-by: John Eckersberg <[email protected]>

Author: jeckersb

Makefile

@@ -13,12 +13,13 @@ CARGO_FEATURES ?= $(shell . /usr/lib/os-release; if echo "$$ID_LIKE" |grep -qF r
 all:
 	cargo build --release --features "$(CARGO_FEATURES)"
 
+STORAGE_RELATIVE_PATH ?= $(shell realpath -m -s --relative-to="$(prefix)/lib/bootc/storage" /sysroot/ostree/bootc/storage)
 install:
 	install -D -m 0755 -t $(DESTDIR)$(prefix)/bin target/release/bootc
 	install -D -m 0755 -t $(DESTDIR)$(prefix)/bin target/release/system-reinstall-bootc
 	install -d -m 0755 $(DESTDIR)$(prefix)/lib/bootc/bound-images.d
 	install -d -m 0755 $(DESTDIR)$(prefix)/lib/bootc/kargs.d
-	ln -s /sysroot/ostree/bootc/storage $(DESTDIR)$(prefix)/lib/bootc/storage
+	ln -s "$(STORAGE_RELATIVE_PATH)" "$(DESTDIR)$(prefix)/lib/bootc/storage"
 	install -D -m 0755 crates/cli/bootc-generator-stub $(DESTDIR)$(prefix)/lib/systemd/system-generators/bootc-systemd-generator 
 	install -d $(DESTDIR)$(prefix)/lib/bootc/install
 	# Support installing pre-generated man pages shipped in source tarball, to avoid