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package lfs
import (
"github.com/git-lfs/git-lfs/v3/git"
"github.com/git-lfs/git-lfs/v3/tools"
)
// calcSkippedRefs checks that locally cached versions of remote refs are still
// present on the remote before they are used as a 'from' point. If the server
// implements garbage collection and a remote branch had been deleted since we
// last did 'git fetch --prune', then the objects in that branch may have also
// been deleted on the server if unreferenced. If some refs are missing on the
// remote, use a more explicit diff command.
func calcSkippedRefs(remote string) []string {
cachedRemoteRefs, _ := git.CachedRemoteRefs(remote)
// Since CachedRemoteRefs() only returns branches, request that
// RemoteRefs() ignore tags and also return only branches.
actualRemoteRefs, _ := git.RemoteRefs(remote, false)
// The list of remote refs can be very large, so convert them to
// a set for faster lookups in the skip calculation loop.
actualRemoteRefsSet := tools.NewStringSet()
for _, ref := range actualRemoteRefs {
actualRemoteRefsSet.Add(ref.Name)
}
// Only check for missing refs on remote; if the ref is different it has moved
// forward probably, and if not and the ref has changed to a non-descendant
// (force push) then that will cause a re-evaluation in a subsequent command.
var skippedRefs []string
for _, cachedRef := range cachedRemoteRefs {
if actualRemoteRefsSet.Contains(cachedRef.Name) {
skippedRefs = append(skippedRefs, "^"+cachedRef.Sha)
}
}
return skippedRefs
}
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