AWS Codebuild: git clone depth of 1 doesn't work

Question

We have a large repo, where a normal clone would take 10+ minutes. We want to set fetch depth to 1 to minimise the time to download source code on AWS Codebuild.

• Setting clone depth to 1 doesn't show any improvement in time:

• It takes 600+ seconds on Codebuild regardless of dept 1 or full depth.

• On local, git clone [email protected]:<org/repo>.git --depth 1 takes less than 1 minute.

• Shallow clone on Github Action takes less than 30 seconds for the same repo. A wild guess is that clone with fetch depth won't work when you specify a branch/version. Github actions might be getting around this by doing a git init followed by a git fetch as per this StackOverflow post: Log output from above screenshot:

/usr/bin/git init /home/runner/work/<repo/name>
/usr/bin/git remote add origin https://github.com/<repo/name>
/usr/bin/git -c protocol.version=2 fetch --no-tags --prune --progress --no-recurse-submodules --depth=1 origin <sha>:refs/remotes/pull/6981/merge

Any thoughts on how to speed up the time spent in downloading source code?