To elaborate on Anton Orlov's answer regarding fetch-depth.
To have git diff the current HEAD (depth:1) against the previous commit (depth:2), then one needs to have at least fetch-depth: 2, and if one wants to diff against deeper history one must set the depth accordingly. Many git work flows only fetch a depth:1 as an optimization, to avoid expensive IO copying entire repos when only the single commit is needed.
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To elaborate on Anton Orlov's answer regarding
fetch-depth.To have
gitdiff the current HEAD (depth:1) against the previous commit (depth:2), then one needs to have at leastfetch-depth: 2, and if one wants to diff against deeper history one must set the depth accordingly. Many git work flows only fetch adepth:1as an optimization, to avoid expensive IO copying entire repos when only the single commit is needed.