New API: mdadm-detail.

[libguestfs.git] / daemon / md.c

diff --git a/daemon/md.c b/daemon/md.c
index 257bd0f..82ddb82 100644 (file)
--- a/daemon/md.c
+++ b/daemon/md.c
@@ -27,6 +27,7 @@
 #include "daemon.h"
 #include "actions.h"
 #include "optgroups.h"
+#include "c-ctype.h"
 
 int
 optgroup_mdadm_available (void)
@@ -230,3 +231,82 @@ error:
   if (r != NULL) free_strings (r);
   return NULL;
 }
+
+char **
+do_mdadm_detail(const char *md)
+{
+  int r;
+
+  char *out = NULL, *err = NULL;
+  char **lines = NULL;
+
+  char **ret = NULL;
+  int size = 0, alloc = 0;
+
+  const char *mdadm[] = { "mdadm", "-DY", md, NULL };
+  r = commandv(&out, &err, mdadm);
+  if (r == -1) {
+    reply_with_error("%s", err);
+    goto error;
+  }
+
+  /* Split the command output into lines */
+  lines = split_lines(out);
+  if (lines == NULL) {
+    reply_with_perror("malloc");
+    goto error;
+  }
+
+  /* Parse the output of mdadm -DY:
+   * MD_LEVEL=raid1
+   * MD_DEVICES=2
+   * MD_METADATA=1.0
+   * MD_UUID=cfa81b59:b6cfbd53:3f02085b:58f4a2e1
+   * MD_NAME=localhost.localdomain:0
+   */
+  for (char **i = lines; *i != NULL; i++) {
+    char *line = *i;
+
+    /* Skip blank lines (shouldn't happen) */
+    if (line[0] == '\0') continue;
+
+    /* Split the line in 2 at the equals sign */
+    char *eq = strchr(line, '=');
+    if (eq) {
+      *eq = '\0'; eq++;
+
+      /* Remove the MD_ prefix from the key and translate the remainder to lower
+       * case */
+      if (STRPREFIX(line, "MD_")) {
+        line += 3;
+        for (char *j = line; *j != '\0'; j++) {
+          *j = c_tolower(*j);
+        }
+      }
+
+      /* Add the key/value pair to the output */
+      if (add_string(&ret, &size, &alloc, line) == -1 ||
+          add_string(&ret, &size, &alloc, eq) == -1) goto error;
+    } else {
+      /* Ignore lines with no equals sign (shouldn't happen). Log to stderr so
+       * it will show up in LIBGUESTFS_DEBUG. */
+      fprintf(stderr, "mdadm-detail: unexpected output ignored: %s", line);
+    }
+  }
+
+  free(out);
+  free(err);
+  free(lines); /* We freed the contained strings when we freed out */
+
+  if (add_string(&ret, &size, &alloc, NULL) == -1) return NULL;
+
+  return ret;
+
+error:
+  free(out);
+  free(err);
+  if (lines) free(lines);
+  if (ret) free_strings(ret);
+
+  return NULL;
+}