[PATCH v4 10/27] fsmonitor-settings: NTFS and FAT32 on MacOS are incompatible

["Jeff Hostetler via GitGitGadget" <gitgitgadget@xxxxxxxxx>]

From: Jeff Hostetler <jeffhost@xxxxxxxxxxxxx>

On MacOS mark repos on NTFS or FAT32 volumes as incompatible.

The builtin FSMonitor used Unix domain sockets on MacOS for IPC
with clients.  These sockets are kept in the .git directory.
Unix sockets are not supported by NTFS and FAT32, so the daemon
cannot start up.

Test for this during our compatibility checking so that client
commands do not keep trying to start the daemon.

Signed-off-by: Jeff Hostetler <jeffhost@xxxxxxxxxxxxx>
---
 compat/fsmonitor/fsm-settings-darwin.c | 20 +++++++++++++++++---
 fsmonitor-settings.c                   |  5 +++++
 fsmonitor-settings.h                   |  1 +
 3 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/compat/fsmonitor/fsm-settings-darwin.c b/compat/fsmonitor/fsm-settings-darwin.c
index fdd762bf79d..efc732c0f31 100644
--- a/compat/fsmonitor/fsm-settings-darwin.c
+++ b/compat/fsmonitor/fsm-settings-darwin.c
@@ -7,7 +7,7 @@
 #include <sys/mount.h>
 
 /*
- * Remote working directories are problematic for FSMonitor.
+ * [1] Remote working directories are problematic for FSMonitor.
  *
  * The underlying file system on the server machine and/or the remote
  * mount type (NFS, SAMBA, etc.) dictates whether notification events
@@ -40,8 +40,16 @@
  *
  * So (for now at least), mark remote working directories as
  * incompatible.
+ *
+ *
+ * [2] FAT32 and NTFS working directories are problematic too.
+ *
+ * The builtin FSMonitor uses a Unix domain socket in the .git
+ * directory for IPC.  These Windows drive formats do not support
+ * Unix domain sockets, so mark them as incompatible for the daemon.
+ *
  */
-static enum fsmonitor_reason check_remote(struct repository *r)
+static enum fsmonitor_reason check_volume(struct repository *r)
 {
 	struct statfs fs;
 
@@ -60,6 +68,12 @@ static enum fsmonitor_reason check_remote(struct repository *r)
 	if (!(fs.f_flags & MNT_LOCAL))
 		return FSMONITOR_REASON_REMOTE;
 
+	if (!strcmp(fs.f_fstypename, "msdos")) /* aka FAT32 */
+		return FSMONITOR_REASON_NOSOCKETS;
+
+	if (!strcmp(fs.f_fstypename, "ntfs"))
+		return FSMONITOR_REASON_NOSOCKETS;
+
 	return FSMONITOR_REASON_OK;
 }
 
@@ -67,7 +81,7 @@ enum fsmonitor_reason fsm_os__incompatible(struct repository *r)
 {
 	enum fsmonitor_reason reason;
 
-	reason = check_remote(r);
+	reason = check_volume(r);
 	if (reason != FSMONITOR_REASON_OK)
 		return reason;
 
diff --git a/fsmonitor-settings.c b/fsmonitor-settings.c
index 0a1811ff004..60d5eaee497 100644
--- a/fsmonitor-settings.c
+++ b/fsmonitor-settings.c
@@ -194,6 +194,11 @@ int fsm_settings__error_if_incompatible(struct repository *r)
 		error(_("virtual repository '%s' is incompatible with fsmonitor"),
 		      r->worktree);
 		return 1;
+
+	case FSMONITOR_REASON_NOSOCKETS:
+		error(_("repository '%s' is incompatible with fsmonitor due to lack of Unix sockets"),
+		      r->worktree);
+		return 1;
 	}
 
 	BUG("Unhandled case in fsm_settings__error_if_incompatible: '%d'",
diff --git a/fsmonitor-settings.h b/fsmonitor-settings.h
index 34391b583b3..23d5676c8c8 100644
--- a/fsmonitor-settings.h
+++ b/fsmonitor-settings.h
@@ -19,6 +19,7 @@ enum fsmonitor_reason {
 	FSMONITOR_REASON_ERROR, /* FS error probing for compatibility */
 	FSMONITOR_REASON_REMOTE,
 	FSMONITOR_REASON_VFS4GIT, /* VFS for Git virtualization */
+	FSMONITOR_REASON_NOSOCKETS, /* NTFS,FAT32 do not support Unix sockets */
 };
 
 void fsm_settings__set_ipc(struct repository *r);
-- 
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