With my patch, "git subtree split -P" produces the same result (for my
data set) as "git filter-branch --subdirectory-filter", which is much
faster, because it selects the revisions to rewrite before rewriting.
As I am not using any of the advanced features of "git subtree", I will
just use "git filter-branch" instead.
Thanks!
Marcus
On 01/20/2016 05:05 AM, David A. Greene wrote:
> Marcus Brinkmann <m.brinkm...@semantics.de> writes:
>
>> 'git subtree split' will fail if the history of the subtree has empty
>> tree commits (or trees that are considered empty, such as submodules).
>> This fix keeps track of this condition and correctly follows the history
>> over such commits.
>
> Thanks for working on this! Please add a test to t7900-subtree.sh.
>
>> @@ -625,12 +629,16 @@ cmd_split()
>>
>> # ugly. is there no better way to tell if this is a subtree
>> # vs. a mainline commit? Does it matter?
>> - if [ -z $tree ]; then
>> - set_notree $rev
>> - if [ -n "$newparents" ]; then
>> - cache_set $rev $rev
>> + if [ -z $found_first_commit ]; then
>> + if [ -z $tree ]; then
>> + set_notree $rev
>> + if [ -n "$newparents" ]; then
>> + cache_set $rev $rev
>> + fi
>> + continue
>> + else
>> + found_first_commit=yes
>> fi
>> - continue
>> fi
>>
>> newrev=$(copy_or_skip "$rev" "$tree" "$newparents") || exit $?
>
> Can you explain the logic here? The old code appears to be using the
> lack of a tree to filter out "mainline" commits from the subtree history
> when splitting. If that test is only done before seeing a proper
> subtree commit and never after, then any commit mainline commit
> following the first subtree commit in the rev list will miss being
> marked with set_notree and the cache will not have the identity entry
> added.
>
> Test #36 in t7900-subtree.sh has a mainline commit listed after the
> first subtree commit in the rev list, I believe.
>
> I'm not positive your change is wrong, I'd just like to understand it
> better. I'd also like a comment explaining why it works so future
> developers don't get confused. Overall, I am trying to better comment
> the code as I make my own changes.
>
> -David
>
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