#
# \brief  Test for using chroot on Linux
# \author Norman Feske
# \date   2012-04-18
#
#
if {![have_spec linux]} { puts "Run script requires Linux"; exit 0 }

#
# Build
#

build { core init drivers/timer/linux test/timer }

if {[catch { exec which setcap }]} {
	puts stderr "Error: setcap not available, please install the libcap2-bin package"
	return 0
}


create_boot_directory

#
# Generate config
#

set config {
	<config>
		<parent-provides>
			<service name="ROM"/>
			<service name="LOG"/>
			<service name="CAP"/>
			<service name="RAM"/>
			<service name="CPU"/>
			<service name="RM"/>
			<service name="PD"/>
		</parent-provides>
		<default-route>
			<any-service> <parent/> <any-child/> </any-service>
		</default-route>
		<start name="timer">
			<resource name="RAM" quantum="1M"/>
			<provides><service name="Timer"/></provides>
		</start>
		<start name="test-timer" root="chroot_path">
			<resource name="RAM" quantum="1G"/>
		</start>
	</config>
}

proc chroot_path            { } { return "/tmp/chroot-test" }
proc chroot_cwd_path        { } { return "[chroot_path][pwd]/[run_dir]" }
proc chroot_genode_tmp_path { } { return "[chroot_path]/tmp/genode-[exec id -u]" }

proc cleanup_chroot { } {
	catch { exec sudo umount -l [chroot_cwd_path] }
	catch { exec sudo umount -l [chroot_genode_tmp_path] }
	catch { exec sudo umount -l [chroot_path]/lib }
	exec rm -rf [chroot_path]
}

# replace 'chroot_path' marker in config with actual path
regsub "chroot_path" $config [chroot_path] config

install_config $config

#
# Copy boot modules into run directory
#
# We cannot use the predefined 'build_boot_image' function here because
# this would create mere symlinks. However, we want to hardlink the
# run directory into the chroot environment. If the directory entries
# were symlinks, those would point to nowhere within the chroot.
#
foreach binary { core init timer test-timer } {
	exec cp -H  bin/$binary [run_dir] }

#
# Grant chroot permission to core
#
# CAP_SYS_ADMIN is needed for bind mounting genode runtime directories
# CAP_SYS_CHROOT is needed to perform the chroot syscall
#
exec sudo setcap cap_sys_admin,cap_sys_chroot=ep [run_dir]/core

#
# Setup chroot environment
#

# start with fresh directory
cleanup_chroot
exec mkdir -p [chroot_path]
exec mkdir -p [chroot_path]/lib

# bind mount '/lib' as we need ldso and libc within the chroot environment
exec sudo mount --bind /lib  [chroot_path]/lib

#
# Execute test case
#
run_genode_until {.*--- timer test finished ---.*} 60

#
# Remove artifacts created while running the test
#
cleanup_chroot

# vi: set ft=tcl :