Work-around snap.yaml command line limitations

This makes the package conformant with other snaps by adding a command
wrapper script inside the root of the snap, which calls out to lsi-exec
to do the real job.

Signed-off-by: Ikey Doherty <ikey@solus-project.com>

apps/linux-steam-integration/meta/snap.yaml

@@ -50,7 +50,7 @@ apps:
       - x11
 
   settings:
-    command: bin/linux-steam-integration.exec $SNAP/bin/linux-steam-integration.settings
+    command: command-linux-steam-integration.settings.wrapper
     plugs:
       - gsettings
       - opengl
@@ -59,28 +59,28 @@ apps:
       - x11
 
   glxgears:
-    command: bin/linux-steam-integration.exec $SNAP/bin/glxgears
+    command: command-glxgears.wrapper
     plugs:
       - opengl
       - unity7
       - x11
 
   glxgears-32:
-    command: bin/linux-steam-integration.exec $SNAP/bin/glxgears-32
+    command: command-glxgears-32.wrapper
     plugs:
       - opengl
       - unity7
       - x11
 
   glxinfo:
-    command: bin/linux-steam-integration.exec $SNAP/bin/glxinfo
+    command: command-glxinfo.wrapper
     plugs:
       - opengl
       - unity7
       - x11
 
   glxinfo-32:
-    command: bin/linux-steam-integration.exec $SNAP/bin/glxinfo-32
+    command: command-glxinfo-32.wrapper
     plugs:
       - opengl
       - unity7

mkapp.sh

@@ -21,6 +21,17 @@ function init_root()
     fi
 }
 
+# Write a wrapper out that runs the named command via our lsi-exec handler
+# and accepts commands. This is so we pass review as we cannot have compound
+# command lines within snap.yaml
+function write_wrapper()
+{
+    local shfile="$ROOTDIR/command-$1.wrapper"
+    echo "#!/bin/sh" > "$shfile"
+    echo "exec \$SNAP/bin/linux-steam-integration.exec \$SNAP/bin/$1 \$*" >> "$shfile"
+    chmod 00755 $shfile
+}
+
 # Cheap and dirty, copy the named runtime meta into the root and tell it to
 # bake a snap for us
 function cook_snap()
@@ -47,6 +58,10 @@ done
 
 rm -rf "$PACKAGE_OUT_DIR"
 
+for wrap in "linux-steam-integration.settings" "glxgears" "glxgears-32" "glxinfo" "glxinfo-32" ; do
+    write_wrapper $wrap
+done
+
 # Now lets cook a snap
 cook_snap linux-steam-integration