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Is there a way to get SHA of current GIT commit from R? I need to access it via a function call (not as a hard string).
I have adapted GIT as version control system for analysis, and want to print the SHA on footnote of my intermediate reports (my working drafts, in pdf format, get a life of their own and it is not immediately obvious by looking at them at what moment they were generated; this creates a reproducibility issue).
For reference: I am using R 3.4.1 via R Studio and creating reports via r markdown.
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# open the git config editor $ git config --global --edit # in the alias section, add ... [alias] lastcommit = rev-parse HEAD ... From here on, use git lastcommit to show the last commit's hash.
Git relies on the collision-resistance of SHA-1. (In practice, if you encounter such a collision, which I believe has never occurred outside of intentional attempts to create collisions), you can just add a space to the end of the commit message, which will generate a new hash.
The SHA1 of the commit is the hash of all the information. And because this hash is unique to its content, a commit can't change. If you change any data about the commit, it will have a new SHA1. Even if the files don't change, the created date will.
You'll need to invoke the git rev-parse command as explained here: How to retrieve the hash for the current commit in Git?
You can do it using system():
https://stat.ethz.ch/R-manual/R-devel/library/base/html/system.html
Putting it together:
system("git rev-parse HEAD", intern=TRUE)
Install git2r package and then:
> library(git2r)
> r = revparse_single(path,"HEAD")
> sha(r)
[1] "f5bb1f115e9db0c732840298465488e8dfea5032"
It also gives you some other info about the commit too, in other members of the returned object:
> r$author
name: Barry Rowlingson
email: [email protected]
when: 2022-01-12 18:37:14 GMT
These are documented in help(commit), but only sha seems to have an accessor function for it.
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