From: Richard W.M. Jones <rjones@redhat.com>
Date: Sat, 13 Nov 2010 14:41:01 +0000 (+0000)
Subject: inspect: Optimize root filesystem check.
X-Git-Tag: 1.7.6~7
X-Git-Url: http://git.annexia.org/?p=libguestfs.git;a=commitdiff_plain;h=a5fd85e7392b589d9d90ab515ad3e4bd1befd874;hp=55e6ccb23e0b1f954107b4d0284d3d41f7a4e7b8

inspect: Optimize root filesystem check.

Avoid duplicate checks for things like /etc and /bin.
---

diff --git a/src/inspect.c b/src/inspect.c
index f5e4490..2f543b5 100644
--- a/src/inspect.c
+++ b/src/inspect.c
@@ -257,13 +257,18 @@ check_filesystem (guestfs_h *g, const char *device)
   fs->device = safe_strdup (g, device);
   fs->is_mountable = 1;
 
+  /* Optimize some of the tests by avoiding multiple tests of the same thing. */
+  int is_dir_etc = guestfs_is_dir (g, "/etc") > 0;
+  int is_dir_bin = guestfs_is_dir (g, "/bin") > 0;
+  int is_dir_share = guestfs_is_dir (g, "/share") > 0;
+
   /* Grub /boot? */
   if (guestfs_is_file (g, "/grub/menu.lst") > 0 ||
       guestfs_is_file (g, "/grub/grub.conf") > 0)
     fs->content = FS_CONTENT_LINUX_BOOT;
   /* Linux root? */
-  else if (guestfs_is_dir (g, "/etc") > 0 &&
-           guestfs_is_dir (g, "/bin") > 0 &&
+  else if (is_dir_etc &&
+           is_dir_bin &&
            guestfs_is_file (g, "/etc/fstab") > 0) {
     fs->is_root = 1;
     fs->content = FS_CONTENT_LINUX_ROOT;
@@ -271,16 +276,16 @@ check_filesystem (guestfs_h *g, const char *device)
       return -1;
   }
   /* Linux /usr/local? */
-  else if (guestfs_is_dir (g, "/etc") > 0 &&
-           guestfs_is_dir (g, "/bin") > 0 &&
-           guestfs_is_dir (g, "/share") > 0 &&
+  else if (is_dir_etc &&
+           is_dir_bin &&
+           is_dir_share &&
            guestfs_exists (g, "/local") == 0 &&
            guestfs_is_file (g, "/etc/fstab") == 0)
     fs->content = FS_CONTENT_LINUX_USR_LOCAL;
   /* Linux /usr? */
-  else if (guestfs_is_dir (g, "/etc") > 0 &&
-           guestfs_is_dir (g, "/bin") > 0 &&
-           guestfs_is_dir (g, "/share") > 0 &&
+  else if (is_dir_etc &&
+           is_dir_bin &&
+           is_dir_share &&
            guestfs_exists (g, "/local") > 0 &&
            guestfs_is_file (g, "/etc/fstab") == 0)
     fs->content = FS_CONTENT_LINUX_USR;