[Replicant] [PATCH] screencap: Add naive SSH backend implementation.

[Wolfgang Wiedmeyer]

Denis 'GNUtoo' Carikli writes:

> This implementation is not efficent as each command will spawn a
> new ssh command, which has considerable overhead and latency.
>
> Example usage:
>   ./screencap.sh -h root at 192.168.43.1 -f OUTPUT.PNG

Thanks, applied! It would be good to document this functionality in the
wiki[1]. I'll have a look at the related issue you opened.
I added a small patch on top that restores the possibility to
set the ADB path at the top of the script.

By the way, do you want to have write access to the repo?

Best regards,
Wolfgang


> Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo at no-log.org>
> ---
>  screencap/screencap.sh | 29 +++++++++++++++++++++++++++--
>  1 file changed, 27 insertions(+), 2 deletions(-)
>
> diff --git a/screencap/screencap.sh b/screencap/screencap.sh
> index 53284b3..7ed7d8c 100755
> --- a/screencap/screencap.sh
> +++ b/screencap/screencap.sh
> @@ -18,13 +18,25 @@
>  set -e
>  
>  FFMEG="ffmpeg"
> -ADB="adb"
> +ADB=""
>  FB_PATH="/dev/graphics/fb0"
> +SSH_HOST=""
>  
>  TMP_FB="fb_raw"
>  TMP_FB_RS="fb_raw_rs"
>  RECOVERY=false
>  
> +ssh_wrapper()
> +{
> +        if [ "$1" = "shell" ] ; then
> +		shift 1
> +                ssh "${SSH_HOST}" "su -c \"$@\""
> +        elif [ "$1" = "pull" ] ; then
> +		shift 1
> +                scp ${SSH_HOST}:$@
> +        fi
> +}
> +
>  print_usage () {
>      echo
>      echo "Usage: $0 [OPTIONS] -f OUTPUT.PNG"
> @@ -33,6 +45,7 @@ print_usage () {
>      echo "Options:"
>      echo "-r, --recovery        Device is booted in recovery mode"
>      echo "-s, --screen-size     Specify screen size (mandatory in recovery mode)"
> +    echo "-h, --ssh-host        Connect to the given host through SSH"
>      echo
>  }
>  
> @@ -66,7 +79,8 @@ take_screenshot () {
>  	PIX_FMT="rgb565"
>      fi
>  
> -    $ADB pull $FB_PATH $TMP_FB
> +    $ADB shell "cat $FB_PATH > /data/local/tmp/$TMP_FB"
> +    $ADB pull /data/local/tmp/$TMP_FB $TMP_FB
>      dd bs=$BS count=$SCREEN_SIZE_Y if=$TMP_FB of=$TMP_FB_RS
>  
>      $FFMEG -vcodec rawvideo -f rawvideo -pix_fmt $PIX_FMT -s $SCREEN_SIZE \
> @@ -91,6 +105,11 @@ do
>  	    SCREEN_SIZE="$2"
>  	    shift 2
>  	    ;;
> +	-h|--ssh-host)
> +	    SSH_HOST="$2"
> +	    shift 2
> +	    ;;
> +
>  	"")
>  	    break
>  	    ;;
> @@ -102,6 +121,12 @@ do
>      esac
>  done
>  
> +if [ -z "${SSH_HOST}" ] ; then
> +	ADB="adb"
> +else
> +	ADB="ssh_wrapper"
> +fi
> +
>  if [ "$OUTFILE" = "" ]; then
>      echo "No output file specified"
>      print_usage



[1]  https://redmine.replicant.us/projects/replicant/wiki/Screenshots

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