Hi,

I was in the need to rewrite author name and email and commit date for a single 
commit and I guess I found a bug.
I run this git-filter script

$ git filter-branch --commit-filter ‘
    if [ "$GIT_COMMIT"="9cfca27" ]; 
        then GIT_AUTHOR_NAME=“Michelle”; 
            GIT_AUTHOR_EMAIL=“miche...@email.com”; 
            GIT_AUTHOR_DATE="2009-12-31T23:59:59”; 
            git commit-tree "$@“; 
        else 
            git commit-tree "$@“;
    fi' HEAD

and found that all history was rewritten as if “Michelle” not only commit 
9cfca27.

I also tried using full length commit id and a non-existing commit id: nothing 
changes.
In the following example to replicate the replicate the bug I’m using a 
non-existing commit id to make the effect more evident.


$ git --version
git version 2.0.1

$ mkdir project

$ cd project

$ git init

$ for i in 1 2 3; do echo "foo" >> foo$i.txt; git add foo$i.txt; git commit -m 
"foo$i"; done
[master (root-commit) 89dec6e] foo1
 1 file changed, 1 insertion(+)
 create mode 100644 foo1.txt
[master 8a3c8e5] foo2
 1 file changed, 1 insertion(+)
 create mode 100644 foo2.txt
[master a3ca061] foo3
 1 file changed, 1 insertion(+)
 create mode 100644 foo3.txt

$ git log --graph --all --pretty=format:'%C(yellow)%h%C(cyan)%d%Creset %s 
%C(white)- %an, %ar%Creset'
* a3ca061 (HEAD, master) foo3 - David, 4 seconds ago
* 8a3c8e5 foo2 - David, 4 seconds ago
* 89dec6e foo1 - David, 4 seconds ago

$ git filter-branch --commit-filter '
    if [ "$GIT_COMMIT"="308add7" ]; 
        then GIT_AUTHOR_NAME="Michelle"; 
            GIT_AUTHOR_EMAIL="miche...@email.com"; 
            GIT_AUTHOR_DATE="2009-12-31T23:59:59"; 
            git commit-tree "$@"; 
        else 
            git commit-tree "$@";
    fi' HEAD

$ git log --graph --all --pretty=format:'%C(yellow)%h%C(cyan)%d%Creset %s 
%C(white)- %an, %ar%Creset'
* 8937dff (HEAD, master) foo3 - Michelle, 4 years, 8 months ago
* 30e494e foo2 - Michelle, 4 years, 8 months ago
* 2a2ba4f foo1 - Michelle, 4 years, 8 months ago
* a3ca061 (refs/original/refs/heads/master) foo3 - David, 8 seconds ago
* 8a3c8e5 foo2 - David, 8 seconds ago
* 89dec6e foo1 - David, 8 seconds ago

$ git log
commit 8937dff7e6a3f5545c2242e3fd5d33acbabe6df4
Author: Michelle <miche...@email.com>
Date:   Thu Dec 31 23:59:59 2009 +0100

    foo3

commit 30e494ef27f16c5456e66214ea46b780581dfb48
Author: Michelle <miche...@email.com>
Date:   Thu Dec 31 23:59:59 2009 +0100

    foo2

commit 2a2ba4fd6b9627e237a12b47570a3f020a202b55
Author: Michelle <miche...@email.com>
Date:   Thu Dec 31 23:59:59 2009 +0100

    foo1


using env-filter, I managed to rewrite the history with this:

$ git filter-branch --env-filter '
 
name="$GIT_AUTHOR_NAME"
email="$GIT_AUTHOR_EMAIL"
 
if [ "$GIT_COMMIT" = "89dec6e4bc1fb3cff694ea83f5ed900dad43449e" ]
then
    name="Michelle"
    email="miche...@email.com"
fi

export GIT_AUTHOR_NAME=“$name"
export GIT_AUTHOR_EMAIL=“$email"
'

Hope this helped.

Davide--
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