Commit Object Structure
-----------------------

[graphviz]
----
digraph {
  rankdir=LR
  node [shape=record, style=filled, fillcolor="#FFAAA1", fontname=arial, fontsize=18]
  commit [label="commit|<f1> tree: 9ce23|Author: John Doe|Committer: John Doe|Initial commit of my project\n\n..."]

  snapshot1 [fillcolor=grey, label="Snapshot 1"]
  commit:f1 -> snapshot1
}
----

[role="incremental"]
* 'SHA1' - globally unique commit ID
* 'SHA1' is function of the commit object content
** 40-digit hexadecimal number
** seen in `git log` output, git history view etc...
** examples: `1590b5c...`, `97aff7a...`, `c0ffee...`