add make install-suid target

eth-cscs · Jun 21, 2022 · d8ecf01 · d8ecf01
1 parent 9c350b8
commit d8ecf01
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Showing 2 changed files with 17 additions and 5 deletions.
diff --git a/Makefile b/Makefile
@@ -1,4 +1,4 @@
-.PHONY: install clean
+.PHONY: install install-suid clean
 
 prefix = /usr/local
 exec_prefix = $(prefix)
@@ -17,10 +17,13 @@ all: squashfs-mount
 squashfs-mount: squashfs-mount.o
 	$(CC) $< $(LDFLAGS) $(SQUASHFS_MOUNT_LDFLAGS) -o $@
 
-
 install: squashfs-mount
 	mkdir -p $(DESTDIR)$(bindir)
 	cp -p squashfs-mount $(DESTDIR)$(bindir)
 
+install-suid: install
+	chown root:root $(DESTDIR)$(bindir)/squashfs-mount
+	chmod u+s $(DESTDIR)$(bindir)/squashfs-mount
+
 clean:
 	rm -f squashfs-mount squashfs-mount.o
diff --git a/README.md b/README.md
@@ -97,9 +97,18 @@ issues:
 
 ## Install instructions
 
+Build and install without privileges and make it a root-owned setuid binary by hand:
+
 ```console
 make
-sudo chown root:root squashfs-mount
-sudo chmod +s squashfs-mount
-make install
+make install prefix=./install
+sudo chown root:root ./install/bin/squashfs-mount
+sudo chmod u+s ./install/bin/squashfs-mount
+```
+
+Or use the `install-suid` target:
+
+```
+make install prefix=./install
+sudo make install-suid prefix=./install
 ```