Fixed Jenkins build error MSB4018: System.InvalidOperationException: Unable to set permission while creating /tmp/NuGetScratch

Problem

• NET Core Jenkin build fail and build logs.

...NuGet.targets(394,5): error MSB4018: The "WarnForInvalidProjectsTask" task failed unexpectedly. [<<Your CS Project>>]                                                                                                                                                                                                                          
...NuGet.targets(394,5): error MSB4018: System.InvalidOperationException: Unable to set permission while creating /tmp/NuGetScratch, errno=1. [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at NuGet.Common.NuGetEnvironment.<GetFolderPath>g__CreateSharedDirectory|6_0(String path) [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at NuGet.Common.NuGetEnvironment.GetFolderPath(NuGetFolderPath folder) [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at NuGet.Common.PathUtility.CheckIfFileSystemIsCaseInsensitive() [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at System.Lazy`1.ViaFactory(LazyThreadSafetyMode mode) [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at System.Lazy`1.ExecutionAndPublication(LazyHelper executionAndPublication, Boolean useDefaultConstructor) [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at System.Lazy`1.CreateValue() [<<Your CS Project>>]
...NuGet.targets(394,5): error MSB4018:    at System.Lazy`1.get_Value() [<<Your CS Project>>]

• It tell System.InvalidOperationException: Unable to set permission while creating /tmp/NuGetScratch
• check /tmp permission by using following command
  NOTE: drwxrwxrwt >> t mean sticky bit is set. A file created in the /tmp directory can only be removed by its owner, or the root user.

# ls -ld /tmp
drwxrwxrwt 21 root root 12288 Apr 24 16:18 /tmp

Solution

• restore correct permission in path /tmp by running the following command

chmod 1777 /tmp
#or
chmod a+trwx /tmp

Reference

• chown - What are correct permissions for /tmp ? I unintentionally set it all public recursively - Unix & Linux Stack Exchange
• My Answer on stackoverflow >> How do I use a docker build cache with nuget when switching users? - Stack Overflow