I want to compare two versions of a file (which exist at different paths) at different commits in git. I don't want the diff, I simply want to know if the contents and modes are the same. The documentation for diff-files doesn't indicate any meaning for return values. I don't see something similar to cmp(1) in git. Is there another plumbing tool to do this or does diff-files have return values that express this?
git ls-tree <commit> -- <path> outputs
<mode> SP <type> SP <object> TAB <file>
<mode> is the file mode. <object> is the sha1 that indicates the content.
Compare the modes and objects.
<object> here can be named in another way
<commit>:<path>
So git rev-parse <commit>:<path> can output the sha1 of the blob or the tree. Comparing the two sha1, we can see if the contents are the same or not.