parted: Add --json cmdline switch to output JSON

This outputs the disk's details as a JSON object. eg. a disk image with
a single partition from 1M to 100M:

{
   "disk": {
      "path": "/root/disk1.img",
      "size": "2097152s",
      "model": "",
      "transport": "file",
      "logical-sector-size": 512,
      "physical-sector-size": 512,
      "label": "gpt",
      "max-partitions": 128,
      "partitions": [
         {
            "number": 0,
            "start": "34s",
            "end": "2047s",
            "size": "2014s",
            "type": "free"
         },{
            "number": 1,
            "start": "2048s",
            "end": "200703s",
            "size": "198656s",
            "type": "primary",
            "name": "root"
         },{
            "number": 0,
            "start": "200704s",
            "end": "2097118s",
            "size": "1896415s",
            "type": "free"
         }
      ]
   }
}

Signed-off-by: Brian C. Lane <bcl@redhat.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/parted/jsonwrt.h b/parted/jsonwrt.h
new file mode 100644
index 0000000..4587b60
--- /dev/null
+++ b/parted/jsonwrt.h
@@ -0,0 +1,46 @@
+#ifndef UTIL_LINUX_JSONWRT_H
+#define UTIL_LINUX_JSONWRT_H
+
+enum {
+	UL_JSON_OBJECT,
+	UL_JSON_ARRAY,
+	UL_JSON_VALUE
+};
+
+struct ul_jsonwrt {
+	FILE *out;
+	int indent;
+
+	unsigned int after_close :1;
+};
+
+void ul_jsonwrt_init(struct ul_jsonwrt *fmt, FILE *out, int indent);
+void ul_jsonwrt_indent(struct ul_jsonwrt *fmt);
+void ul_jsonwrt_open(struct ul_jsonwrt *fmt, const char *name, int type);
+void ul_jsonwrt_close(struct ul_jsonwrt *fmt, int type);
+
+#define ul_jsonwrt_root_open(_f)	ul_jsonwrt_open(_f, NULL, UL_JSON_OBJECT)
+#define ul_jsonwrt_root_close(_f)	ul_jsonwrt_close(_f, UL_JSON_OBJECT)
+
+#define ul_jsonwrt_array_open(_f, _n)	ul_jsonwrt_open(_f, _n, UL_JSON_ARRAY)
+#define ul_jsonwrt_array_close(_f)	ul_jsonwrt_close(_f, UL_JSON_ARRAY)
+
+#define ul_jsonwrt_object_open(_f, _n)	ul_jsonwrt_open(_f, _n, UL_JSON_OBJECT)
+#define ul_jsonwrt_object_close(_f)	ul_jsonwrt_close(_f, UL_JSON_OBJECT)
+
+#define ul_jsonwrt_value_open(_f, _n)	ul_jsonwrt_open(_f, _n, UL_JSON_VALUE)
+#define ul_jsonwrt_value_close(_f)	ul_jsonwrt_close(_f, UL_JSON_VALUE)
+
+
+void ul_jsonwrt_value_raw(struct ul_jsonwrt *fmt,
+			const char *name, const char *data);
+void ul_jsonwrt_value_s(struct ul_jsonwrt *fmt,
+			const char *name, const char *data);
+void ul_jsonwrt_value_u64(struct ul_jsonwrt *fmt,
+			const char *name, uint64_t data);
+void ul_jsonwrt_value_boolean(struct ul_jsonwrt *fmt,
+			const char *name, int data);
+void ul_jsonwrt_value_null(struct ul_jsonwrt *fmt,
+			const char *name);
+
+#endif /* UTIL_LINUX_JSONWRT_H */