[Qemu-devel] Difference between commit and rebase

[lampahome]

I want to remove snapshots and I found two ways:
qemu-img commit
qemu-img rebase

I found they both can choose where to rebase(merge) the images.
commit can truncate or not on specific image.
rebase won't truncate rebased image.

I found they have something similarity and I don't know what situation is
suitable for commit or rebase?