Implement synchronisation detection

1 files changed, 34 insertions, 3 deletions

diff --git a/src/main.c b/src/main.c
index 59ad231..85bf4ce 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1075,13 +1075,44 @@ static void ftag_query(int argc, char **argv)
 
 static void ftag_sync(int argc, char **argv)
 {
-	struct stat st;
 	char *remote_path = FTAG_REMOTE_ROOT "/ftag.sqlite3";
 	char cmd[1024];
 	strbuild(cmd, "ssh %s sh -c 'test -f %s && stat --format=%%Y %s || echo 0'",
 		 FTAG_REMOTE_HOST, remote_path, remote_path);
-	FILE *stream = popen(cmd, "r");
-	int rc = stat(DATABASE_PATH, &st);
+	FILE *pipe = popen(cmd, "r");
+	if (!pipe) {
+		fprintf(stderr, "popen: ssh %s: ", FTAG_REMOTE_HOST);
+		perror("");
+		exit(EXIT_FAILURE);
+	}
+	size_t line_size = 32;
+	char *line = malloc(line_size);
+	ssize_t line_len;
+	printf("Output of \"%s\":\n", cmd);
+	printf("BEGIN\n");
+	while ((line_len = getline(&line, &line_size, pipe)) != -1) {
+		printf("%s", line);
+	}
+	printf("END\n");
+	if (ferror(pipe)) {
+		perror("getline");
+		exit(EXIT_FAILURE);
+	}
+	int rc = pclose(pipe);
+	if (rc == 1) {
+		fprintf(stderr, "pclose: ssh %s: ", FTAG_REMOTE_HOST);
+		perror("");
+		exit(EXIT_FAILURE);
+	}
+	time_t remote_mtime = atol(line);
+	free(line);
+	struct stat st;
+	rc = stat(DATABASE_PATH, &st);
+	time_t local_mtime = st.st_mtim.tv_sec;
+	if (local_mtime > remote_mtime)
+		printf("ftag sync: local is more recent than remote !\n");
+	else
+		printf("ftag sync: local is more recent than remote !\n");
 }
 
 /* Check that the tag we are trying to create does not exist yet. If this