Implement '*grep*' family of commands.

[libguestfs.git] / daemon / grep.c

diff --git a/daemon/grep.c b/daemon/grep.c
new file mode 100644 (file)
index 0000000..c51dc0b
--- /dev/null
+++ b/daemon/grep.c
@@ -0,0 +1,140 @@
+/* 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"
+
+static char **
+grep (const char *prog, const char *flag, char *regex, char *path)
+{
+  char *buf;
+  char *out, *err;
+  int r;
+  char **lines;
+
+  NEED_ROOT (NULL);
+  ABS_PATH (path, NULL);
+
+  /* Make the path relative to /sysroot. */
+  buf = sysroot_path (path);
+  if (!buf) {
+    reply_with_perror ("malloc");
+    return NULL;
+  }
+
+  /* Note that grep returns an error if no match.  We want to
+   * suppress this error and return an empty list.
+   */
+  r = commandr (&out, &err, prog, flag, regex, buf, NULL);
+  free (buf);
+  if (r == -1 || r > 1) {
+    reply_with_error ("%s %s %s: %s", prog, flag, regex, err);
+    free (out);
+    free (err);
+    return NULL;
+  }
+
+  free (err);
+
+  lines = split_lines (out);
+  free (out);
+  if (lines == NULL) return NULL;
+
+  return lines;
+}
+
+char **
+do_grep (char *regex, char *path)
+{
+  /* The "--" is not really needed, but it helps when we don't need a flag. */
+  return grep ("grep", "--", regex, path);
+}
+
+char **
+do_egrep (char *regex, char *path)
+{
+  return grep ("egrep", "--", regex, path);
+}
+
+char **
+do_fgrep (char *regex, char *path)
+{
+  return grep ("fgrep", "--", regex, path);
+}
+
+char **
+do_grepi (char *regex, char *path)
+{
+  return grep ("grep", "-i", regex, path);
+}
+
+char **
+do_egrepi (char *regex, char *path)
+{
+  return grep ("egrep", "-i", regex, path);
+}
+
+char **
+do_fgrepi (char *regex, char *path)
+{
+  return grep ("fgrep", "-i", regex, path);
+}
+
+char **
+do_zgrep (char *regex, char *path)
+{
+  return grep ("zgrep", "--", regex, path);
+}
+
+char **
+do_zegrep (char *regex, char *path)
+{
+  return grep ("zegrep", "--", regex, path);
+}
+
+char **
+do_zfgrep (char *regex, char *path)
+{
+  return grep ("zfgrep", "--", regex, path);
+}
+
+char **
+do_zgrepi (char *regex, char *path)
+{
+  return grep ("zgrep", "-i", regex, path);
+}
+
+char **
+do_zegrepi (char *regex, char *path)
+{
+  return grep ("zegrep", "-i", regex, path);
+}
+
+char **
+do_zfgrepi (char *regex, char *path)
+{
+  return grep ("zfgrep", "-i", regex, path);
+}