From aeedc5826cb0594318031e35acaf8b4a1b6e7c32 Mon Sep 17 00:00:00 2001
From: Michael Orlitzky <michael@orlitzky.com>
Date: Sun, 25 Feb 2018 20:03:44 -0500
Subject: [PATCH] Inline the is_hardlink_safe() and is_regular_file()
 functions.

These two functions were only called in one place, and they were
called right after one another. Both functions merely peek the stat
structure for a file descriptor, so it's easier to stat the thing once
and then just inline the two checks rather than setup/teardown
everything twice.
---
 src/apply-default-acl.c | 67 +++++++----------------------------------
 1 file changed, 11 insertions(+), 56 deletions(-)

diff --git a/src/apply-default-acl.c b/src/apply-default-acl.c
index b43a1c6..fb472a5 100644
--- a/src/apply-default-acl.c
+++ b/src/apply-default-acl.c
@@ -35,56 +35,6 @@
 
 
 
-/**
- * @brief Determine if the given file descriptor might refer to an
- *   (unsafe) hard link.
- *
- * @param fd
- *   The file descriptor whose link count we want to investigate.
- *
- * @return true if we are certain that @c fd does not describe a hard
- *   link, and false otherwise. In case of error, false is returned,
- *   because we are not sure that @c fd is not a hard link.
- */
-bool is_hardlink_safe(int fd) {
-  if (fd <= 0) {
-    return false;
-  }
-  struct stat s;
-  if (fstat(fd, &s) == 0) {
-    return (s.st_nlink == 1 || S_ISDIR(s.st_mode));
-  }
-  else {
-    return false;
-  }
-}
-
-
-/**
- * @brief Determine whether or not the given file descriptor is for
- *   a regular file.
- *
- * @param fd
- *   The file descriptor to test for regular-fileness.
- *
- * @return true if @c fd describes a regular file, and false otherwise.
- */
-bool is_regular_file(int fd) {
-  if (fd <= 0) {
-    return false;
-  }
-
-  struct stat s;
-  if (fstat(fd, &s) == 0) {
-    return S_ISREG(s.st_mode);
-  }
-  else {
-    return false;
-  }
-}
-
-
-
 /**
  * @brief Determine whether or not the given path is accessible.
  *
@@ -679,16 +629,21 @@ int apply_default_acl(const char* path, bool no_exec_mask) {
    * between when we open the file descriptor (look above) and when we
    * fstat it.
   */
-  if (!is_hardlink_safe(fd)) {
-    result = ACL_FAILURE;
+  struct stat s;
+  if (fstat(fd, &s) == -1) {
+    perror("apply_default_acl (fstat)");
     goto cleanup;
   }
-
-  if (!is_regular_file(fd) && !is_directory(fd)) {
-    result = ACL_FAILURE;
-    goto cleanup;
+  if (!S_ISDIR(s.st_mode)) {
+    /* If it's not a directory, make sure it's a regular,
+       non-hard-linked file. */
+    if (!S_ISREG(s.st_mode) || s.st_nlink != 1) {
+      result = ACL_FAILURE;
+      goto cleanup;
+    }
   }
 
+
   /* Default to not masking the exec bit; i.e. applying the default
      ACL literally. If --no-exec-mask was not specified, then we try
      to "guess" whether or not to mask the exec bit. */
-- 
2.44.2