I found it -- this might kind of be a `tup` bug too.
Basically, bundle tries to look for `gemspec` files in certain folders 
recursively. The recursive search is done with `Dir['{,*,*/*}.gemspec']` 
which triggers `open/openat` with 
`O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC` calls for each file/directory. 
Since the O_DIRECTORY flag causes these calls to immediate fail on 
nodirectory entries, `tup` shouldn't register these open calls open calls 
that set up a dependency.


On Saturday, February 7, 2015 at 10:40:20 AM UTC+1, Petr Skočík wrote:
>
> Seems like an issue with bundler. I figured out how to do the dot graphs, 
> and it turns out adding `bundle exec` into the command adds a dependency on 
> every other file in the directory.
> As a matter of fact doing `./noop.rb` on any of those files triggers a 
> rebuild.
> I'll try to look into bundler to see where it tries to read each file in 
> the directory.
>
> On Friday, February 6, 2015 at 10:43:03 PM UTC+1, Freddie Chopin wrote:
>>
>> On 02/06/2015 10:29 PM, Petr Skočík wrote: 
>> > Hi, 
>> > How can I do this please? 
>> > I'd like to be able to add new rules or remove old ones, and I don't 
>> > want this to mark every other target as outdated. 
>> > I tried resetting the timestamp to its original value as it was before 
>> > I opened the Tupfile for writing, but even so rebuilding gets 
>> > triggered for all targets (even if I just open it for writing, close 
>> > it, and restore the original atime and mtime). 
>>
>>  From what I know as long as you don't change* the rules for these 
>> "every other targets" they should _NOT_ be rebuilt - tup will check what 
>> changed and do only the necessary minimum of work that has to be done. 
>>
>> If your experience is different, then there must be something wrong - 
>> post a minimal example and we'll take a look. 
>>
>> Regards, 
>> FCh 
>>
>> * "change" as an actual modification to the command, not just some 
>> formatting, saving of Tupfiles or stuff like that - there has to be a 
>> change that makes the command string different from what it was 
>> previously 
>>
>

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