git: Preserve sparse checkout directories when switching branches

[kane8n]

Description

Problem

When cloning a repository with SparseCheckoutDirectories option, the sparse checkout setting was not preserved when calling SwitchBranch(). This caused a full checkout of all files instead of only the specified directories.

Root Cause

The SwitchBranch() method in client.go did not pass SparseCheckoutDirectories to wt.Checkout(), unlike the clone functions in clone.go which correctly handle this option.

Solution

• Added sparseCheckoutDirectories field to the Client struct to store the sparse checkout configuration
• Store the sparse checkout directories during clone operations (cloneBranch, cloneTag, cloneCommit, cloneSemVer)
• Pass the stored sparseCheckoutDirectories to wt.Checkout() in SwitchBranch()

Changes

• git/gogit/client.go: Added sparseCheckoutDirectories field to Client struct and updated SwitchBranch() to use it
• git/gogit/clone.go: Store SparseCheckoutDirectories from clone options into the client
• git/gogit/client_test.go: Added test case to verify sparse checkout is preserved after branch switch

[stefanprodan]

LGTM

Thanks @kane8n

[matheuscscp]

LGTM

[matheuscscp]

Thanks @kane8n! git/gogit/v0.43.0 is tagged, can you please implement this in source-controller and image-automation-controller? Thanks!

[stefanprodan]

I don't think we switch branches in SC, this is an IAC only feature

[kane8n]

@matheuscscp
Created a PR in image-automation-controller to bump git/gogit to v0.43.0

• deps: update fluxcd/pkg/git/gogit to v0.43.0 image-automation-controller#999