esr:
Junio C Hamano <gitster <at> pobox.com>:
quoted
Perhaps not exactly what you are looking for, but don't we have
import-tar somewhere in contrib/fast-import hierarchy (sorry, not on
a machine yet, and I cannot give more details).
If I recall correctly, that can only be used for original import.
You may find my (old) ag-import-patch tool useful. Although the name does not
imply it, it allows to import a series of releases that can be available either as
tarballs or as patches.
http://ydirson.free.fr/soft/git/argit.git/
There's not much doc in there, and not so much I can remember myself from the short
help string. IIRC you can specify which base revision a patch applies to (ie. it
may apply to an older revision, not necessarily to the current HEAD).
It has also quite some bitrot (git-* direct invocation, use of cg-tag, surely more).