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97jaz / gregor

Date and time library for Racket
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Odd issue with gregor+tzinfo #29

Closed srfoster closed 4 years ago

srfoster commented 5 years ago

I have a couple of packages that depend on gregor. I've noticed that occasionally, when I want to update, I have to update my packages twice. The second time always works. The first time fails with some interesting things in the raco log. First interesting thing is this bit:

The following out-of-date packages are listed as dependencies of MY-PACKAGE and they will be automatically updated:
    tzinfo
    tzinfo
    various
    other
    dependencies
    etc.

Why is tzinfo listed twice? I wasn't sure (though I do have a murky theory that I'll share at the end of this message).

The second weird thing is the actual failure:

Uninstalling to prepare re-install of tzinfo
Moving tzinfo to trash: /path/to/trash
Uninstsalling to prepare re-install of tzinfo
raco pkg install: package not currently installed
  package: tzinfo
  current scope: user

It tried to move tzinfo to the trash twice. The second time, it fails, and raco update MY-PACKAGE bails. Then when I run raco update MY-PACKAGE the second time, everything is fine -- because the first raco update left things in a state where tzinfo wasn't installed.

I was digging around in the gregor repo and I noticed that gregor depends on gregor-lib and gregor-docs. Both of those depend on tzinfo.

Normally, I wouldn't think that's a problem. However, when I look at this in light of the behavior I'm seeing, my theory is that something is causing Racket to think that it needs to update tzinfo twice. Not sure exactly why. And I'm not sure if this is actually a Racket/Raco bug.

However, do you think it could be the way the gregor dependencies are set up?

srfoster commented 5 years ago

My workaround, BTW, is to raco pkg update tzinfo before my first install. That circumvents the error. But I'm still curious about the root cause.

97jaz commented 5 years ago

@srfoster Off the top of my head, I don't know. I haven't seen this before. Does

raco pkg show -a|grep tzinfo

show more than one installation of the package?

97jaz commented 5 years ago

@srfoster To clarify, I don't think this is something that normally happens, so I suspect it has something to do with your local setup. It's normal for multiple packages to depend on the same package.

srfoster commented 5 years ago

Yes, it's definitely normal.

And I would tend to agree that there's something weird about my setup. However, I haven't been able to find anything weird about it.

To answer your other question, I don't appear to have more than one installation of the same package.

srfoster commented 5 years ago

Update:

Since posting, I've now seen the same error pop up with regard to non-gregor-related packages. It still mystifies me why it's happening, and it's starting to feel like a bug with raco update. I have a couple of machines where I can catch the bug happening, and I'm looking at the raco update source code to see if I can figure out what's going on. I'm also trying to discover a reliable way of reproducing what I'm seeing.

I'll report back when I know more. If you have ideas, please let me know. :)

97jaz commented 4 years ago

@srfoster I'm going to close this issue, but if you find out any thing further and it points to a bug in gregor, please let me know, and I'll reopen it.