image: Add /sysroot as a toplevel bind mount to the real root

This allows tools to see and operate on the "real" root conveniently;
for example, ostree clearly needs to operate on /ostree/repo.

parallel-debian/gnomeos-make-image.sh

@@ -144,8 +144,10 @@ if ! test -d ${OBJ}; then
         rm ostree/gnomeos-origin/debian-setup.sh
         (cd ostree/gnomeos-origin; find . '!' -type p | grep -v '^.$' | $OSTREE commit -s 'Run debian-setup.sh' --repo=../repo --from-stdin)
 
-        cp -p ${SRCDIR}/chroot_break ostree/gnomeos-origin/sbin/chroot_break
-        (cd ostree/gnomeos-origin; $OSTREE commit -s 'Add chroot_break' --repo=../repo --add=sbin/chroot_break)
+        # This is the name for the real rootfs, not the chroot
+        (cd ostree/gnomeos-origin;
+            mkdir sysroot;
+            $OSTREE commit -s 'Add sysroot' --repo=../repo --add=sysroot)
 
         (cd ostree;
             rev=$($OSTREE rev-parse --repo=repo master)

parallel-debian/gnomeos-run.sh

@@ -45,4 +45,4 @@ fi
 kv=`uname -r`
 kernel=/boot/vmlinuz-${kv}
 
-exec qemu-kvm -kernel ${kernel} -initrd gnomeos-initrd.img -hda gnomeos-fs.img -append "root=/dev/sda ostree=current"
+exec qemu-kvm -kernel ${kernel} -initrd gnomeos-initrd.img -hda gnomeos-fs.img -append "root=/dev/sda ostree=current $1"

parallel-debian/ostree_switch_root.c

@@ -219,6 +219,12 @@ static int switchroot(const char *newroot, const char *subroot)
 		}
 	}
 
+	snprintf(destpath, sizeof(destpath), "%s/sysroot", subroot_path);
+	if (mount(newroot, destpath, NULL, MS_BIND, NULL) < 0) {
+		perrorv("Failed bind mount sysroot");
+		return -1;
+	}
+
 	if (chdir(newroot)) {
 		perrorv("failed to change directory to %s", newroot);
 		return -1;