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steps to delete a copyrighted file from a git repository using BFG-repo-cleaner
# my local copy of the offending repo was at ~/github/nlesc/enram
# ================= stage 1 =================
# (I removed offending files with git rm, then commited and pushed to GitHub)
# key thing is: the HEAD needs to be clean of offending files
# I also cut all branches except master, not sure how that affects anything
# also important: merge any open pull requests, otherwise you end up undoing the
# history deletion when you merge them later
# ================= stage 2 =================
# create a *mirror* clone in a new directory
cd ~/tmp
# cloning with https is apparently important (I didn't try with
git clone --mirror
# don't cd into it...yet
# download BFG-repo-cleaner from here:
# BFG comes in the form of a jar, so to run it, you'll need Java Runtime
# for simplicity I made a bash_alias in ~/.bash_aliases:
# bfg='java -jar <path to bfg.jar>'
# (open new terminal in order to use new alias)
# BFG retroactively deletes files by filename, so if 'Chapter09.pdf' is the offending file:
bfg --delete-files Chapter09.pdf enram.git
# Note: if you happen to have (had) a file named 'Chapter09.pdf' some place else in the
# directory tree, I assume BFG's filename-based matching will result in deletion of
# those files as well, which may not be what you want.
# now cd into the repo
cd enram.git
# do some git magic (not entirely sure what this does, but it takes a while to complete):
git reflog expire --expire=now --all
git gc --prune=now --aggressive
# push the repo with changed history
git push
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