Add 'checksum' command.

1 files changed, 85 insertions, 0 deletions

diff --git a/daemon/checksum.c b/daemon/checksum.c
new file mode 100644
index 00000000..bdbef13b
--- /dev/null
+++ b/daemon/checksum.c
@@ -0,0 +1,85 @@
+/* libguestfs - the guestfsd daemon
+ * Copyright (C) 2009 Red Hat Inc. 
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "../src/guestfs_protocol.h"
+#include "daemon.h"
+#include "actions.h"
+
+char *
+do_checksum (const char *csumtype, const char *path)
+{
+  const char *program;
+  char *buf;
+  char *out, *err;
+  int r, len;
+
+  NEED_ROOT (NULL);
+  ABS_PATH (path, NULL);
+
+  if (strcasecmp (csumtype, "crc") == 0)
+    program = "cksum";
+  else if (strcasecmp (csumtype, "md5") == 0)
+    program = "md5sum";
+  else if (strcasecmp (csumtype, "sha1") == 0)
+    program = "sha1sum";
+  else if (strcasecmp (csumtype, "sha224") == 0)
+    program = "sha224sum";
+  else if (strcasecmp (csumtype, "sha256") == 0)
+    program = "sha256sum";
+  else if (strcasecmp (csumtype, "sha384") == 0)
+    program = "sha384sum";
+  else if (strcasecmp (csumtype, "sha512") == 0)
+    program = "sha512sum";
+  else {
+    reply_with_error ("unknown checksum type, expecting crc|md5|sha1|sha224|sha256|sha384|sha512");
+    return NULL;
+  }
+
+  /* Make the path relative to /sysroot. */
+  len = strlen (path) + 9;
+  buf = malloc (len);
+  if (!buf) {
+    reply_with_perror ("malloc");
+    return NULL;
+  }
+  snprintf (buf, len, "/sysroot%s", path);
+
+  r = command (&out, &err, program, buf, NULL);
+  free (buf);
+  if (r == -1) {
+    reply_with_error ("%s: %s", program, err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  /* Split it at the first whitespace. */
+  len = strcspn (out, " \t\n");
+  out[len] = '\0';
+
+  return out;			/* Caller frees. */
+}