Store loom name in metadata instead of path

src/emu/loom.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2021-2023 Barcelona Supercomputing Center (BSC)
+/* Copyright (c) 2021-2024 Barcelona Supercomputing Center (BSC)
  * SPDX-License-Identifier: GPL-3.0-or-later */
 
 #include "loom.h"
@@ -8,15 +8,13 @@
 #include "cpu.h"
 #include "path.h"
 #include "proc.h"
+#include "stream.h"
 #include "uthash.h"
 
-static const char *loom_prefix = "loom.";
-
 static void
 set_hostname(char host[PATH_MAX], const char name[PATH_MAX])
 {
-	/* Skip prefix */
-	const char *start = name + strlen(loom_prefix);
+	const char *start = name;
 
 	/* Copy until dot or end */
 	int i;
@@ -30,10 +28,19 @@ set_hostname(char host[PATH_MAX], const char name[PATH_MAX])
 	host[i] = '\0';
 }
 
-int
-loom_matches(const char *path)
+const char *
+loom_name(struct stream *s)
 {
-	return path_has_prefix(path, loom_prefix);
+	JSON_Object *meta = stream_metadata(s);
+	const char *loom = json_object_dotget_string(meta, "ovni.loom");
+
+	if (loom == NULL) {
+		err("cannot get attribute ovni.loom for stream: %s",
+				s->relpath);
+		return NULL;
+	}
+
+	return loom;
 }
 
 int
@@ -41,11 +48,6 @@ loom_init_begin(struct loom *loom, const char *name)
 {
 	memset(loom, 0, sizeof(struct loom));
 
-	if (!path_has_prefix(name, loom_prefix)) {
-		err("loom name must start with '%s': %s", loom_prefix, name);
-		return -1;
-	}
-
 	if (strchr(name, '/') != NULL) {
 		err("loom name cannot contain '/': %s", name);
 		return -1;

src/emu/loom.h

@@ -12,6 +12,7 @@
 #include "cpu.h"
 #include "extend.h"
 struct proc;
+struct stream;
 
 struct loom {
 	int64_t gindex;
@@ -50,7 +51,7 @@ struct loom {
 	struct extend ext;
 };
 
-USE_RET int loom_matches(const char *relpath);
+USE_RET const char *loom_name(struct stream *s);
 USE_RET int loom_init_begin(struct loom *loom, const char *name);
 USE_RET int loom_init_end(struct loom *loom);
 USE_RET int loom_add_cpu(struct loom *loom, struct cpu *cpu);

src/emu/stream.c

@@ -194,9 +194,13 @@ stream_data_get(struct stream *stream)
 	return stream->data;
 }
 
+/* Is never NULL */
 JSON_Object *
 stream_metadata(struct stream *stream)
 {
+	if (stream->meta == NULL)
+		die("stream metadata is NULL: %s", stream->relpath);
+
 	return stream->meta;
 }
 

src/emu/system.c

@@ -131,16 +131,11 @@ find_loom(struct system *sys, const char *id)
 }
 
 static struct loom *
-create_loom(struct system *sys, const char *relpath)
+create_loom(struct system *sys, struct stream *s)
 {
-	char name[PATH_MAX];
-	if (snprintf(name, PATH_MAX, "%s", relpath) >= PATH_MAX) {
-		err("path too long: %s", relpath);
-		return NULL;
-	}
-
-	if (strtok(name, "/") == NULL) {
-		err("cannot find first '/': %s", relpath);
+	const char *name = loom_name(s);
+	if (name == NULL) {
+		err("loom_name failed");
 		return NULL;
 	}
 
@@ -268,7 +263,7 @@ create_system(struct system *sys, struct trace *trace)
 			continue;
 		}
 
-		struct loom *loom = create_loom(sys, s->relpath);
+		struct loom *loom = create_loom(sys, s);
 		if (loom == NULL) {
 			err("create_loom failed");
 			return -1;

src/rt/ovni.c

@@ -556,6 +556,9 @@ thread_metadata_populate(void)
 
 	if (json_object_dotset_number(meta, "ovni.pid", (double) rproc.pid) != 0)
 		die("json_object_dotset_number failed");
+
+	if (json_object_dotset_string(meta, "ovni.loom", rproc.loom) != 0)
+		die("json_object_dotset_string failed");
 }
 
 static void