From 66954c83bfc7549897eed4610ef4fca899d343fc Mon Sep 17 00:00:00 2001
From: andy5995 <andy400-dev@yahoo.com>
Date: Mon, 26 Apr 2021 00:26:09 -0500
Subject: [PATCH] try using faccessat() instead of lstat()

(#283)
---
 src/restore_rmw.c       | 45 ++++++++++++++++++++++++++++++++---------
 src/utils_rmw.c         | 13 +++++++++++-
 test/test_restore.sh.in |  2 +-
 3 files changed, 48 insertions(+), 12 deletions(-)

diff --git a/src/restore_rmw.c b/src/restore_rmw.c
index 8cf6942c..dee733e9 100644
--- a/src/restore_rmw.c
+++ b/src/restore_rmw.c
@@ -65,10 +65,35 @@ char *get_waste_parent (const char *src)
 int
 restore (const char *src, st_time *st_time_var, const rmw_options * cli_user_options, st_waste *waste_head)
 {
-  if (exists (src))
+  char *src_with_path = src;
+  if (*src != '.' && *src != '/')
   {
-    bufchk (src, LEN_MAX_PATH);
-    char *waste_parent = get_waste_parent (src);
+    src_with_path = malloc (LEN_MAX_PATH);
+    chk_malloc (src_with_path, __func__, __LINE__);
+    src_with_path = getcwd (src_with_path, PATH_MAX);
+    if (src_with_path == NULL || *src_with_path != '/')
+    {
+      print_msg_error ();
+      fprintf (stderr, "while getting the current working directory\n");
+      return 1;
+    }
+    int req_len = multi_strlen (src_with_path, "/", src, NULL) + 1;
+    bufchk_len (req_len, LEN_MAX_PATH, __func__, __LINE__);
+    char tmp[LEN_MAX_PATH];
+    snprintf (tmp, req_len, "%s/%s", src_with_path, src);
+    strcpy (src_with_path, tmp);
+  }
+
+  char src_real[strlen (src_with_path) + 1];
+  strcpy (src_real, src_with_path);
+
+  if (src_with_path != src)
+    free (src_with_path);
+
+  if (exists (src_real))
+  {
+    bufchk (src_real, LEN_MAX_PATH);
+    char *waste_parent = get_waste_parent (src_real);
 
     st_waste *waste_curr = waste_head;
     bool waste_match = false;
@@ -85,12 +110,12 @@ restore (const char *src, st_time *st_time_var, const rmw_options * cli_user_opt
     if (!waste_match)
     {
       print_msg_error ();
-      fprintf (stderr, "'%s' is not in a Waste directory.\n", src);
+      fprintf (stderr, "'%s' is not in a Waste directory.\n", src_real);
       return 1;
     }
 
-    char src_copy[strlen (src) + 1];
-    strcpy (src_copy, src);
+    char src_copy[strlen (src_real) + 1];
+    strcpy (src_copy, src_real);
     char *src_basename = basename (src_copy);
 
     char src_tinfo[LEN_MAX_PATH];
@@ -145,11 +170,11 @@ Duplicate filename at destination - appending time string...\n"));
 
     int rename_res = 0;
     if (cli_user_options->want_dry_run == false)
-      rename_res = rename (src, dest);
+      rename_res = rename (src_real, dest);
 
     if (!rename_res)
     {
-      printf ("+'%s' -> '%s'\n", src, dest);
+      printf ("+'%s' -> '%s'\n", src_real, dest);
 
       int result = 0;
       if (cli_user_options->want_dry_run == false)
@@ -166,7 +191,7 @@ Duplicate filename at destination - appending time string...\n"));
     }
     else
     {
-      msg_err_rename (src, dest, __func__, __LINE__);
+      msg_err_rename (src_real, dest, __func__, __LINE__);
       return rename_res;
     }
   }
@@ -176,7 +201,7 @@ Duplicate filename at destination - appending time string...\n"));
      * string below it unchanged */
     printf (" :");
     /* TRANSLATORS:  "%s" refers to a file or directory  */
-    printf (_("File not found: '%s'\n"), src);
+    printf (_("File not found: '%s'\n"), src_real);
     msg_return_code (ENOENT);
     return ENOENT;
   }
diff --git a/src/utils_rmw.c b/src/utils_rmw.c
index ca3ae51d..823d1e1e 100644
--- a/src/utils_rmw.c
+++ b/src/utils_rmw.c
@@ -28,6 +28,8 @@
   #include "globals.h"
 #endif
 
+#include <unistd.h>
+#include <fcntl.h>
 #include "utils_rmw.h"
 #include "strings_rmw.h"
 #include "messages_rmw.h"
@@ -100,7 +102,16 @@ bool exists (const char *filename)
 
   static struct stat st;
   static int res;
-  res = (lstat (filename, &st));
+  // res = (lstat (filename, &st));
+  char filename_copy[LEN_MAX_PATH];
+  strcpy (filename_copy, filename);
+  if (filename[0] != '.' && *filename != '/')
+  {
+    char tmp[LEN_MAX_PATH];
+    snprintf (tmp, LEN_MAX_PATH, "./%s", filename);
+    strcpy (filename_copy, tmp);
+  }
+  res = faccessat(0, filename_copy,  F_OK, AT_SYMLINK_NOFOLLOW);
   return res == 0 ? true : false;
 }
 
diff --git a/test/test_restore.sh.in b/test/test_restore.sh.in
index e803c363..cf6fd908 100644
--- a/test/test_restore.sh.in
+++ b/test/test_restore.sh.in
@@ -51,7 +51,7 @@ set -x
 $RMW_TEST_CMD_STRING $RMWTEST_HOME/somefiles/topdir -v || exit $?
 cd $PRIMARY_WASTE_DIR/files
 output=$($RMW_TEST_CMD_STRING -z topd*) || exit $?
-test "$output" = "+'topdir' -> '$RMWTEST_HOME/somefiles/topdir'" || exit $?
+test "$output" = "+'$RMWTEST_HOME/.Waste/files/topdir' -> '$RMWTEST_HOME/somefiles/topdir'" || exit $?
 
 echo $SEPARATOR
 echo "Try restoring a file that doesn't exist"