feature: Added '--specignore' option to pass file containing specs to be ignored for fission spec commands (#2239)

- New flag `--specignore` has been added for command fission spec [list | validate | apply | destroy]
- This flag is optional.
- The default spec ignore file name is `.specignore`, if the flag is not used
- The spec ignore file existence will be checked in the `--specdir` path
- If spec ignore file is passed to the flag, with a name other than .specignore and if it does not exist in the `--specdir` path then an error will be returned.
- `--specdir` will be the root path against which the patterns will be evaluated
- The behaviour of the spec ignore file will be similar to .gitignore (only for yml and yaml files). For reference: http://git-scm.com/docs/gitignore

pkg/fission-cli/cmd/spec/command.go

@@ -39,7 +39,7 @@ func Commands() *cobra.Command {
 		RunE:  wrapper.Wrapper(Validate),
 	}
 	wrapper.SetFlags(validateCmd, flag.FlagSet{
-		Optional: []flag.Flag{flag.SpecDir},
+		Optional: []flag.Flag{flag.SpecDir, flag.SpecIgnore},
 	})
 
 	applyCmd := &cobra.Command{
@@ -48,7 +48,7 @@ func Commands() *cobra.Command {
 		RunE:  wrapper.Wrapper(Apply),
 	}
 	wrapper.SetFlags(applyCmd, flag.FlagSet{
-		Optional: []flag.Flag{flag.SpecDir, flag.SpecDelete, flag.SpecWait, flag.SpecWatch, flag.SpecValidation},
+		Optional: []flag.Flag{flag.SpecDir, flag.SpecIgnore, flag.SpecDelete, flag.SpecWait, flag.SpecWatch, flag.SpecValidation},
 	})
 
 	destroyCmd := &cobra.Command{
@@ -57,7 +57,7 @@ func Commands() *cobra.Command {
 		RunE:  wrapper.Wrapper(Destroy),
 	}
 	wrapper.SetFlags(destroyCmd, flag.FlagSet{
-		Optional: []flag.Flag{flag.SpecDir},
+		Optional: []flag.Flag{flag.SpecDir, flag.SpecIgnore},
 	})
 
 	listCmd := &cobra.Command{
@@ -66,7 +66,7 @@ func Commands() *cobra.Command {
 		RunE:  wrapper.Wrapper(List),
 	}
 	wrapper.SetFlags(listCmd, flag.FlagSet{
-		Optional: []flag.Flag{flag.SpecDeployID, flag.SpecDir},
+		Optional: []flag.Flag{flag.SpecDeployID, flag.SpecDir, flag.SpecIgnore},
 	})
 
 	command := &cobra.Command{