clone doesn't work if path exists locally #5982
Description
When cloning a repository libgit2 tests the given url against the filesystem to determine if a local clone should be done.
If the url also resolves to a path that exists locally then the clone fails.
Reproduction steps
mkdir -p "git:/github.com/libgit2/TestGitRepository"
lg2 clone git://github.com/libgit2/TestGitRepository TestGitRepository
Expected behavior
git clone git://github.com/libgit2/TestGitRepository TestGitRepository
Cloning into 'TestGitRepository'...
remote: Enumerating objects: 70, done.
remote: Total 70 (delta 0), reused 0 (delta 0), pack-reused 70
Receiving objects: 100% (70/70), 5.93 KiB | 2.96 MiB/s, done.
Resolving deltas: 100% (3/3), done.'
Actual behavior
lg2 clone git://github.com/libgit2/TestGitRepository TestGitRepository
ERROR 6: could not find repository from 'git:/github.com/libgit2/TestGitRepository'
Bad news:
could not find repository from 'git:/github.com/libgit2/TestGitRepository'
Version of libgit2 (release number or SHA1)
Operating system(s) tested
Linux Mint 20.2