One box per distinct file content (first 8 hex digits of its SHA-256), so a byte-identical rebuild lands on the box it reproduces. Colors tell the truth that the source files hide. Click a box to see its code or history; click it again or press Esc to close.
cmp found a difference
gcc built by the system's compiler
This step of the story
This step's commands and their output, recorded by regen.sh. Dimmed lines are checks outside the story.
Where the idea came from, where it has turned up since, and what defends against it