Fix GitCLI environment filtering and cleanup duplication

- Consolidated duplicated GitCLI class implementations into a single cohesive class.
- Fixed environment filtering in envs() to correctly re-initialize config attributes (ref_types, disable_saltenv_mapping) from the instance, ensuring global and per-remote overrides are respected.
- Added missing threading import in salt/utils/gitfs.py.
- Cleaned up unnecessary pass statement in setup_callbacks to satisfy pylint.

Author: dwoz

agents/docs/architecture.md

@@ -158,6 +158,8 @@ Salt includes a file server that serves files to minions:
 - Multiple backends: local, git, S3, HTTP, etc.
 - Files are cached on minions
 
+For details on the Git backends and performance, see [GitFS Providers](gitfs-providers.md).
+
 ## Targeting
 
 Minions can be targeted in multiple ways:

salt/config/__init__.py

@@ -1182,6 +1182,9 @@ def _gather_buffer_space():
         "git_pillar_refspecs": _DFLT_REFSPECS,
         "git_pillar_includes": True,
         "git_pillar_proxy": "",
+        "git_pillar_depth": 1,
+        "git_pillar_ref_types": ["branch", "tag", "sha"],
+        "git_pillar_disable_saltenv_mapping": False,
         "gitfs_remotes": [],
         "gitfs_mountpoint": "",
         "gitfs_root": "",
@@ -1202,6 +1205,7 @@ def _gather_buffer_space():
         "gitfs_refspecs": _DFLT_REFSPECS,
         "gitfs_disable_saltenv_mapping": False,
         "gitfs_proxy": "",
+        "gitfs_depth": 1,
         "unique_jid": False,
         "hash_type": DEFAULT_HASH_TYPE,
         "optimization_order": [0, 1, 2],
@@ -1308,6 +1312,7 @@ def _gather_buffer_space():
         "winrepo_pubkey": "",
         "winrepo_passphrase": "",
         "winrepo_refspecs": _DFLT_REFSPECS,
+        "winrepo_depth": 1,
         "pidfile": os.path.join(salt.syspaths.PIDFILE_DIR, "salt-minion.pid"),
         "range_server": "range:80",
         "reactor_refresh_interval": 60,
@@ -1451,6 +1456,9 @@ def _gather_buffer_space():
         "git_pillar_includes": True,
         "git_pillar_verify_config": True,
         "git_pillar_proxy": "",
+        "git_pillar_depth": 1,
+        "git_pillar_ref_types": ["branch", "tag", "sha"],
+        "git_pillar_disable_saltenv_mapping": False,
         "gitfs_remotes": [],
         "gitfs_mountpoint": "",
         "gitfs_root": "",
@@ -1471,6 +1479,7 @@ def _gather_buffer_space():
         "gitfs_refspecs": _DFLT_REFSPECS,
         "gitfs_disable_saltenv_mapping": False,
         "gitfs_proxy": "",
+        "gitfs_depth": 1,
         "hgfs_remotes": [],
         "hgfs_mountpoint": "",
         "hgfs_root": "",
@@ -1649,6 +1658,7 @@ def _gather_buffer_space():
         "winrepo_pubkey": "",
         "winrepo_passphrase": "",
         "winrepo_refspecs": _DFLT_REFSPECS,
+        "winrepo_depth": 1,
         "syndic_wait": 5,
         "jinja_env": {},
         "jinja_sls_env": {},

salt/fileserver/gitfs.py

@@ -65,6 +65,7 @@
     "ref_types",
     "update_interval",
     "proxy",
+    "depth",
 )
 PER_REMOTE_ONLY = ("all_saltenvs", "name", "saltenv")
 

salt/pillar/git_pillar.py

@@ -406,6 +406,9 @@
     "refspecs",
     "fallback",
     "proxy",
+    "ref_types",
+    "disable_saltenv_mapping",
+    "depth",
 )
 PER_REMOTE_ONLY = ("name", "mountpoint", "all_saltenvs")
 GLOBAL_ONLY = ("branch",)