From: "Philip Oakley" <>
> From: "Christian Couder" <>
>> Maybe we can show that in an example. But I think the patch is quite
>> clear as it is and should be enough.
>> If we really want to correct some false beliefs, the best would be to
>> state the truth where those false beliefs are stated.
> I've added a sub-comment to the original SO post that started this
> thread (my post $gmane/231598 - SO/a/18027030/717355), but given the
> guy's blog has comments going back to 2009 I suspect its a bit of a
> task, hence my desire that it's explicitly
> mentioned in the 'replace' documentation. In addition, if the guy
> doesn't correct his post I'll mark it down in a couple of days to make
> it plain to other readers it's in error.
> The creation of a (merge?) commit that's equivalent to a graft line
> isn't something that jumps out (to me) as an easy couple lines of bash
> script.
> A 'graft2replace' script (or 'git-graft' command) which takes an
> existing graft file (or command line list) and creates the replacement
> objects and then does the replace, all while still in a dirty tree
> would be the holy grail for properly deprecating grafts (which are
> sooo easy to create)

You mean something like the following:

$ cat  ./ 

while read orig parents
        printf "%s" "git cat-file commit $orig"
        printf "%s" " | perl -n -e 'print unless /^parent /'"
        for commit in $parents; do insn="$insn print \"parent $commit\\n\";"; 
        printf "%s" " | perl -n -e 'print; if (/^tree /) { $insn }'"
        printf "%s\n" " > new_commit.txt"
        printf "%s\n" 'REPL=$(git hash-object -t commit -w new_commit.txt)'
        printf "%s\n" "git replace $orig \$REPL"

This generates shell instructions from a graft file. Then you only need to 
execute the generated shell instructions.
For example:

$ cat graft_file.txt 

$ cat graft_file.txt | ./ 
git cat-file commit 5bf34fff3186254d7254583675d10ddf98df989b | perl -n -e 
'print unless /^parent /' | perl -n -e 'print; if (/^tree /) {  print "parent 
79fe155489351e8af829a3106e7150397c57d863\n"; print "parent 
dcfbab6bea3df3166503f3084cec2679f10f9e80\n"; }' > new_commit.txt
REPL=$(git hash-object -t commit -w new_commit.txt)
git replace 5bf34fff3186254d7254583675d10ddf98df989b $REPL
git cat-file commit fb5657082148297b61fbca7e64d51c1e7870309a | perl -n -e 
'print unless /^parent /' | perl -n -e 'print; if (/^tree /) {  }' > 
REPL=$(git hash-object -t commit -w new_commit.txt)
git replace fb5657082148297b61fbca7e64d51c1e7870309a $REPL

Note that I haven't really tested it.

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