finding nearest tag of a commit #5589

mainrs · 2020-07-31T00:10:59Z

mainrs
Jul 31, 2020

Hey!

I need to find the closest tag for a given commit:

commit a (HEAD -> master)
commit b
commit c (tag: v1.2.0)

Given the commit hash b I need to somehow be able to tell that the latest tag from that point of view was v1.2.0. Could you point me into directions on how to do this?

Thank you!

Answered by mainrs

Aug 5, 2020

I figured it out. Maybe it's just me but I find the documentation of libgit2 super hard to read. With no prior knowledge of how exactly git works under the hood and what mechanisms can be used to achieve certain things, it takes a relatively long time to figure stuff out :)

I could luckily modify my problem domain. I now had to just get a list of all commits between HEAD and the latest git tag. This can be done fairly easily without any tricks. It's worth noting though that the latest git tag does not always mean the latest version. People often enough re-tag old releases and those tags are newer but might point to an older version of the software. So I parsed the version strings manually…

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mainrs · 2020-08-05T13:53:52Z

mainrs
Aug 5, 2020
Author

I figured it out. Maybe it's just me but I find the documentation of libgit2 super hard to read. With no prior knowledge of how exactly git works under the hood and what mechanisms can be used to achieve certain things, it takes a relatively long time to figure stuff out :)

I could luckily modify my problem domain. I now had to just get a list of all commits between HEAD and the latest git tag. This can be done fairly easily without any tricks. It's worth noting though that the latest git tag does not always mean the latest version. People often enough re-tag old releases and those tags are newer but might point to an older version of the software. So I parsed the version strings manually using semver to get the highest, e.g. latest version tag. Getting the commit for a tag can be done by simply peeling it.

Edit: For further readers, I've used the Rust library git2 and not libgit2 directly. So code won't help you probably.

2 replies

ltt-stripe Jul 5, 2021

Would be great if you could share some example code!

mainrs Oct 5, 2021
Author

Never be the guy who finds a solution for his own issue and just says "Nevermind, found the solution, bye".

I did edit my comment and said how I've done it. I just retrieved a list of all commits between HEAD and the latest git tag. And to get the latest git tag, I've retrieved the list of all git tags and sorted them after parsing them by semver, not by date. Since, in a lot of cases, people re-tag older releases.

The code won't help you, because I didn't use libgit2. I've used the Rust bindings. And since this is a C library, Rust code won't help you (probably).

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finding nearest tag of a commit #5589

mainrs Jul 31, 2020

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mainrs Aug 5, 2020 Author

ltt-stripe Jul 5, 2021

mainrs Oct 5, 2021 Author

mainrs
Jul 31, 2020

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mainrs
Aug 5, 2020
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mainrs Oct 5, 2021
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