[ros-users] Tutorial doubts

[Narasimhan Rajagopal]

i have ubuntu 10.04. i have installed ROS using the precompiled binaries(karmic ubuntu 9.10) method. i installed ROS only(didn't install base and pr2).

i was following the tutorials when i came across a few problems.

1. in this http://www.ros.org/wiki/ROS/Tutorials/NavigatingTheFilesystem

the command

"rospack find roscpp"

returns

narasimhan at narasimhan-desktop:/opt/ros/boxturtle/ros$ rospack find roscpp
[rospack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
/opt/ros/boxturtle/ros/core/roscpp

and if i execute the same command again it returns

/opt/ros/boxturtle/ros/core/roscpp

why does the "[rospack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks" occurs the first time but not the 2nd time.

2. the output of these commands
$ roscd roscpp
$ pwd
is
/opt/ros/boxturtle/ros/core/roscpp
but the one shown in the tutorial is
~/ros/ros/core/roscpp
and in the next tutorial http://www.ros.org/wiki/ROS/Tutorials/CreatingPackage
the output of commands
$ roscd beginner_tutorials 
$ pwd
is
/home/narasimhan/ros-tutorials/ros_tutorials/beginner_tutorials
but the one shown in the tutorial is
~/ros/pkgs/ros_tutorials/beginner_tutorials
my guess is that the tutorials given in the website are written using some previous version of ros

3.the command "ros log" gives
No active roscore
bash: cd: /home/narasimhan/.ros/log: No such file or directory

4.in this http://www.ros.org/wiki/ROS/Tutorials/NavigatingTheFilesystem
the following packages does not exist in my ROS
rosls ethercat_hardware/

rosls laser_
laser_assembler/                laser_geometry/
laser_camera_calibration/       laser_head_updater/
laser_cb_detector/              laser_joint_processor/
laser_cb_processing/            laser_pipeline/
laser_drivers/                  laser_scan_publisher_tutorial/
laser_filters/

only laser_scan_publisher_tutorial/ exists.

5.in this tutorial http://www.ros.org/wiki/ROS/Tutorials/BuildingPackages
the command
"rosdep install turtlesim"
gives output as
"executing this script:
 set -o errexit
#No Packages to install"

is this ok?

6.the command
$ roscd  turtle_teleop
$ svn up
gives output as
At revision 29804.

the command
$ roscd 
$ svn up
gives output
Skipped '.'

is these outputs normal?

7.the command
"rosdep install turtle_teleop rxtools"
gives output
narasimhan at narasimhan-desktop:/opt/ros/boxturtle/ros$ rosdep install turtle_teleop rxtools
"[rosstack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
Failed to find stack for package [joy]
Failed to load rosdep.yaml for package [joy]:Cannot locate installation of package joy: [rospack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
[rospack] couldn't find package [joy]. ROS_ROOT[/opt/ros/boxturtle/ros] ROS_PACKAGE_PATH[/home/narasimhan/ros-tutorials/ros_tutorials:/home/narasimhan/ros-tutorials/ros_pkg_tutorials:/opt/ros/boxturtle/stacks]
Failed to find stack for package [spacenav_node]
Failed to load rosdep.yaml for package [spacenav_node]:Cannot locate installation of package spacenav_node: [rospack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
[rospack] couldn't find package [spacenav_node]. ROS_ROOT[/opt/ros/boxturtle/ros] ROS_PACKAGE_PATH[/home/narasimhan/ros-tutorials/ros_tutorials:/home/narasimhan/ros-tutorials/ros_pkg_tutorials:/opt/ros/boxturtle/stacks]
Failed to find stack for package [ps3joy]
Failed to load rosdep.yaml for package [ps3joy]:Cannot locate installation of package ps3joy: [rospack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
[rospack] couldn't find package [ps3joy]. ROS_ROOT[/opt/ros/boxturtle/ros] ROS_PACKAGE_PATH[/home/narasimhan/ros-tutorials/ros_tutorials:/home/narasimhan/ros-tutorials/ros_pkg_tutorials:/opt/ros/boxturtle/stacks]
Failed to find stack for package [wiimote]
Failed to load rosdep.yaml for package [wiimote]:Cannot locate installation of package wiimote: [rospack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
[rospack] couldn't find package [wiimote]. ROS_ROOT[/opt/ros/boxturtle/ros] ROS_PACKAGE_PATH[/home/narasimhan/ros-tutorials/ros_tutorials:/home/narasimhan/ros-tutorials/ros_pkg_tutorials:/opt/ros/boxturtle/stacks]
[rosstack] opendir error [No such file or directory] while crawling /opt/ros/boxturtle/stacks
[rosstack] couldn't find dependency [joystick_drivers] of [ros_pkg_tutorials]
[rosstack] missing dependency
executing this script:
 set -o errexit
#No Packages to install"

i think the problem here is in the manifest file of both turtle_teleop and rxtools there is no row specifying system dependencies.

thanks for reading and please help


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