Truncating commit history

Redmine to Github migration of all relevant branches.

This is a copy of script used for truncating the history and rewriting the hashes before pushing to Github.
updateFBR.sh

Truncating development branch history

Truncating the history of an existing branch in a development clone could use truncate-history.sh

Runtimes for example feature branch

This is a table of the time it took to run the development branch script using branch feature/MVP1a.

repo	runtime	# rewritten
larana	0m18.331s	1222
larcore	0m11.186s	761
larcorealg	0m22.399s	1544
larcoreobj	0m0.205s	0
lardata	0m23.491s	1608
lardataalg	0m0.173s	0
lardataobj	0m10.398s	520
larevt	0m9.634s	649
lareventdisplay	0m13.403s	930
larexamples	0m7.436s	509
larg4	0m0.164s	0
larpandora	0m13.518s	895
larreco	1m36.789s	6319
larsim	2m47.225s	8666
larsoft	0m17.011s	1209
larsoftobj	0m0.169s	0
larwirecell	0m0.176s	0

Truncating commit history at svn to git transition

The git replace —graft command is used to truncate the history. This requires git version 2.13 or better.