[trafficserver] 07/09: Add check on Environment input to validate it exists

[zw...@apache.org]

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zwoop pushed a commit to branch 7.1.x
in repository https://gitbox.apache.org/repos/asf/trafficserver.git

commit 4ba94efa85689ac86c19e3659c939bb93a2b2305
Author: Jason Kenny <dr...@live.com>
AuthorDate: Tue Aug 15 17:14:22 2017 -0500

    Add check on Environment input to validate it exists
    
    (cherry picked from commit ee9477d13f659e27ca6525ebdd084d91d50a00a1)
---
 lib/ts/runroot.cc | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/ts/runroot.cc b/lib/ts/runroot.cc
index c6261c4..ef49ce0 100644
--- a/lib/ts/runroot.cc
+++ b/lib/ts/runroot.cc
@@ -70,6 +70,15 @@ check_parent_path(const std::string &path, bool json = false)
   return {};
 }
 
+// until I get a <filesystem> impl in
+bool
+is_directory(const char *directory)
+{
+  struct stat buffer;
+  int result = stat(directory, &buffer);
+  return (!result && (S_IFDIR & buffer.st_mode)) ? true : false;
+}
+
 // handler for ts runroot
 void
 runroot_handler(const char **argv, bool json = false)
@@ -112,8 +121,9 @@ runroot_handler(const char **argv, bool json = false)
     }
   }
   // 2. argv provided invalid/no yaml file, then check env variable
-  if (getenv("TS_RUNROOT") != nullptr) {
-    setenv("USING_RUNROOT", getenv("TS_RUNROOT"), true);
+  char *env_val = getenv("TS_RUNROOT");
+  if ((env_val != nullptr) && is_directory(env_val)) {
+    setenv("USING_RUNROOT", env_val, true);
     if (!json)
       ink_notice("using the environment variable TS_RUNROOT");
     return;

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