Is it possible to specify a commit SHA when fetching/building?

[mjram0s]

Hello. I want to specify a specific commit (not version or master) to build. For example coinbrew build Cbc@<commit SHA>. Is this possible? I don't see it mentioned in the docs.

[tkralphs]

Yes, it's possible, but the mechanism should be improved. There seems to be a small bug. With the current version, it seems you have to do

coinbrew fetch Cbc@master --main-proj-sha=<commit SHA> 

The request for master ends up being ignored, but if you don't specify it, coinbrew will complain.

Note, however, that this does not check out the dependencies as they were at that time, so what you probably really want is to use the --time option, which checks out all packages at a particular point in time. You can use the date format of the git commit log. So do something like

~/projects/Clp> git show c5b57d3d759a6c
commit c5b57d3d759a6cf198600d768df87761e65e406c
Author: Ruan Luies <[email protected]>
Date:   Mon Jul 25 17:21:10 2022 +0200
...
~/Projects> coinbrew fetch Clp@master --time="Mon Jul 25 17:21:10 2022"

Note that the --time option has the same bug. If you open an issue on this, I'll try to have a look at it.

[tkralphs]

I guess it would be be easy to make the mechanism for checking out a particular SHA also figure out the time at which to check out other dependencies. I can also try to look at that if you open an issue.

[mjram0s]

Thank you for your help, I'll try the --time option. I opened a new issue from your comment and will add to it if I run into problems.

[mjram0s]

When building after fetching, do I just need to pass in the project name? e.g.

> coinbrew fetch Clp@master --time="Mon Jul 25 17:21:10 2022"
> coinbrew build Clp

[tkralphs]

Yes, if you don't specify version, whatever version is already fetched will be built. You can actually do building and fetching all at once. If you specify a version with the build command that has not already been fetched, it will automatically fetch it first. I personally prefer just to do the fetch first and then build.