After I easily switched from Mercurial to Git, I needed to update the committer’s name and email adress. I found that using git filter-branch could help me.
Here is what I did :
git filter-branch --env-filter \ 'export GIT_AUTHOR_NAME="Foo" ; GIT_AUTHOR_EMAIL="foo.bar@example.com"'
And git updated the author’s name and author’s email for every commit.
‘Hope that helps 
For a project I am currently working I needed to switch from Mercurial to Git.
I used the method described below, that is really trivial and it works just fine.
Download fast-export and extract it wherever you want.
Run the following commands :
mkdir git.migration && cd !$ && git init /path/to/fast-export/hg-fast-export.sh -r /path/to/your/mercurial/repository
And wait for a few minutes/seconds, depending on the size of your repository. In the end of the process you should get a result like :
git-fast-import statistics: --------------------------------------------------------------------- Alloc'd objects: 10000 Total objects: 5426 ( 566 duplicates ) blobs : 1990 ( 453 duplicates 1454 deltas) trees : 3027 ( 113 duplicates 1762 deltas) commits: 409 ( 0 duplicates 0 deltas) tags : 0 ( 0 duplicates 0 deltas) Total branches: 1 ( 1 loads ) marks: 1024 ( 409 unique ) atoms: 1030 Memory total: 2540 KiB pools: 2149 KiB objects: 390 KiB --------------------------------------------------------------------- pack_report: getpagesize() = 4096 pack_report: core.packedGitWindowSize = 33554432 pack_report: core.packedGitLimit = 268435456 pack_report: pack_used_ctr = 1 pack_report: pack_mmap_calls = 1 pack_report: pack_open_windows = 1 / 1 pack_report: pack_mapped = 7542871 / 7542871 ---------------------------------------------------------------------
Now run :
git checkout
Done.
‘Hope that helps
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