From: Eric DeCosta <edecosta@xxxxxxxxxxxxx>
Though perhaps not common, there are uses cases where users have large,
network-mounted repos. Having the ability to run fsmonitor against
network paths would benefit those users.
Most modern Samba-based filers have the necessary support to enable
fsmonitor on network-mounted repos. As a first step towards enabling
fsmonitor to work against network-mounted repos, introduce a
configuration option, 'fsmonitor.allowRemote'. Setting this option to
true will override the default behavior (erroring-out) when a
network-mounted repo is detected by fsmonitor.
Additionally, as part of this first step, monitoring of network-mounted
repos will be restricted to those mounted over SMB regardless of the
value of 'fsmonitor.allowRemote' until more extensive testing can be
performed.
Signed-off-by: Eric DeCosta <edecosta@xxxxxxxxxxxxx>
---
compat/fsmonitor/fsm-settings-win32.c | 59 ++++++++++++++++++++++++++-
1 file changed, 58 insertions(+), 1 deletion(-)
diff --git a/compat/fsmonitor/fsm-settings-win32.c b/compat/fsmonitor/fsm-settings-win32.c
index 907655720bb..d120e4710cf 100644
--- a/compat/fsmonitor/fsm-settings-win32.c
+++ b/compat/fsmonitor/fsm-settings-win32.c
@@ -24,6 +24,58 @@ static enum fsmonitor_reason check_vfs4git(struct repository *r)
return FSMONITOR_REASON_OK;
}
+/*
+ * Check if monitoring remote working directories is allowed.
+ *
+ * By default monitoring remote working directories is not allowed,
+ * but users may override this behavior in enviroments where they
+ * have proper support.
+*/
+static enum fsmonitor_reason check_allow_remote(struct repository *r)
+{
+ int allow;
+
+ if (repo_config_get_bool(r, "fsmonitor.allowremote", &allow) || !allow)
+ return FSMONITOR_REASON_REMOTE;
+
+ return FSMONITOR_REASON_OK;
+}
+
+/*
+ * Check if the remote working directory is mounted via SMB
+ *
+ * For now, remote working directories are only supported via SMB mounts
+*/
+static enum fsmonitor_reason check_smb(wchar_t *wpath)
+{
+ HANDLE h;
+ FILE_REMOTE_PROTOCOL_INFO proto_info;
+
+ h = CreateFileW(wpath, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING,
+ FILE_FLAG_BACKUP_SEMANTICS, NULL);
+
+ if (h == INVALID_HANDLE_VALUE) {
+ error(_("[GLE %ld] unable to open for read '%ls'"),
+ GetLastError(), wpath);
+ return FSMONITOR_REASON_ERROR;
+ }
+
+ if (!GetFileInformationByHandleEx(h, FileRemoteProtocolInfo,
+ &proto_info, sizeof(proto_info))) {
+ error(_("[GLE %ld] unable to get protocol information for '%ls'"),
+ GetLastError(), wpath);
+ CloseHandle(h);
+ return FSMONITOR_REASON_ERROR;
+ }
+
+ CloseHandle(h);
+
+ if (proto_info.Protocol == WNNC_NET_SMB)
+ return FSMONITOR_REASON_OK;
+
+ return FSMONITOR_REASON_ERROR;
+}
+
/*
* Remote working directories are problematic for FSMonitor.
*
@@ -76,6 +128,7 @@ static enum fsmonitor_reason check_vfs4git(struct repository *r)
*/
static enum fsmonitor_reason check_remote(struct repository *r)
{
+ enum fsmonitor_reason reason;
wchar_t wpath[MAX_PATH];
wchar_t wfullpath[MAX_PATH];
size_t wlen;
@@ -115,7 +168,11 @@ static enum fsmonitor_reason check_remote(struct repository *r)
trace_printf_key(&trace_fsmonitor,
"check_remote('%s') true",
r->worktree);
- return FSMONITOR_REASON_REMOTE;
+
+ reason = check_smb(wfullpath);
+ if (reason != FSMONITOR_REASON_OK)
+ return reason;
+ return check_allow_remote(r);
}
return FSMONITOR_REASON_OK;
--
gitgitgadget
