feat(remake): clarify exercise

- specify what happens when directory passed as argument does not
exist
- add hints in subjects
- update solution and tests accordingly

sh/tests/remake_test.sh

@@ -4,16 +4,19 @@ IFS='
 '
 
 challenge () {
-    if [[ $# -eq 1 ]]; then
+    if [[ $# -eq 1 && -d "$1" ]]; then
         submitted=$(bash student/remake.sh "$1")
         expected=$(bash solutions/remake.sh "$1"-expected)
         diff <(echo $submitted) <(echo $expected)
         diff <(ls -ltr $1) <(ls -ltr $1-expected)
-        rm -rf "$1" "$1-expected"
     else
         diff <(bash student/remake.sh "$@") <(bash solutions/remake.sh "$@")
     fi
 }
 
+mkdir remake remake-expected
 challenge remake 
 challenge
+challenge not-there
+rm -rf remake remake-expected
+

sh/tests/solutions/remake.sh

@@ -3,8 +3,7 @@
 IFS='
 '
 
-if [[ $# -eq 1 ]]; then
+if [[ $# -eq 1 && -d "$1" ]]; then
-    mkdir -p $1
     cd $1
     touch -t 01010001 ciao
     chmod 442 ciao

subjects/devops/remake/README.md

@@ -4,7 +4,7 @@
 
 Create a file `remake.sh`, which will take one argument, the relative path of a directory, and will create new files and directories in it. The new files and directories created must have the same name, permission and modification dates as shown in the example below.
 
-If the number of given arguments is not one, your script should print `Error` and exit with the status code 1.
+If the number of given arguments is not one or if the directory given as argument does not exist, your script should print `Error` and exit with the status code 1.
 
 Below the expected behavior of your script:
 
@@ -25,5 +25,19 @@ $
 
 - `touch -t <file-path>` allows to specify the modification time in the format `[[CC]YY]MMDDhhmm[.ss]` instead of the current time for the file at `<file-path>`.
 
+- it is possible to check whether a file or a directory exists with the following commands:
+
+```bash
+if [[ -d $DIRPATH ]]; then # for a directory
+    echo "the $DIRPATH exists"
+fi
+```
+
+```bash
+if [[ -f $FILEPATH ]]; then # for a file
+    echo "the $FILEPATH exists"
+fi
+```
+
 > You have to use Man or Google to know more about commands flags, in order to solve this exercise!
 > Google and Man will be your friends!