/usr/share/shape_msgs/msg/Mesh.msg is in ros-shape-msgs 1.12.5-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | # Definition of a mesh
# list of triangles; the index values refer to positions in vertices[]
MeshTriangle[] triangles
# the actual vertices that make up the mesh
geometry_msgs/Point[] vertices
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