Add test for new README.md in docs

Prefer index.md instead since they provide clean URLs in the docs site

scripts/lint-doc.sh

@@ -3,7 +3,7 @@
 cd "$(dirname "$0")/.."
 
 # Use long options (e.g. --header instead of -H) for curl examples in documentation.
-echo 'Checking for curl short options...'
+echo '=> Checking for cURL short options...'
 grep --extended-regexp --recursive --color=auto 'curl (.+ )?-[^- ].*' doc/ >/dev/null 2>&1
 if [ $? == 0 ]
 then
@@ -15,7 +15,7 @@ fi
 
 # Ensure that the CHANGELOG.md does not contain duplicate versions
 DUPLICATE_CHANGELOG_VERSIONS=$(grep --extended-regexp '^## .+' CHANGELOG.md | sed -E 's| \(.+\)||' | sort -r | uniq -d)
-echo 'Checking for CHANGELOG.md duplicate entries...'
+echo '=> Checking for CHANGELOG.md duplicate entries...'
 if [ "${DUPLICATE_CHANGELOG_VERSIONS}" != "" ]
 then
   echo '✖ ERROR: Duplicate versions in CHANGELOG.md:' >&2
@@ -25,7 +25,7 @@ fi
 
 # Make sure no files in doc/ are executable
 EXEC_PERM_COUNT=$(find doc/ app/ -type f -perm 755 | wc -l)
-echo 'Checking for executable permissions...'
+echo '=> Checking for executable permissions...'
 if [ "${EXEC_PERM_COUNT}" -ne 0 ]
 then
   echo '✖ ERROR: Executable permissions should not be used in documentation! Use `chmod 644` to the files in question:' >&2
@@ -33,5 +33,33 @@ then
   exit 1
 fi
 
+# Do not use 'README.md', instead use 'index.md'
+# Number of 'README.md's as of 2018-03-26
+NUMBER_READMES_CE=42
+NUMBER_READMES_EE=46
+FIND_READMES=$(find doc/ -name "README.md" | wc -l)
+echo '=> Checking for new README.md files...'
+if [ "${CI_PROJECT_NAME}" == 'gitlab-ce' ]
+then
+  if [ ${FIND_READMES} -ne ${NUMBER_READMES_CE} ]
+  then
+    echo
+    echo '  ✖ ERROR: New README.md file(s) detected, prefer index.md over README.md.' >&2
+    echo '  https://docs.gitlab.com/ee/development/writing_documentation.html#location-and-naming-documents'
+    echo
+    exit 1
+  fi
+elif [ "${CI_PROJECT_NAME}" == 'gitlab-ee' ]
+then
+  if [ ${FIND_READMES} -ne $NUMBER_READMES_EE ]
+  then
+    echo
+    echo '  ✖ ERROR: New README.md file(s) detected, prefer index.md over README.md.' >&2
+    echo '  https://docs.gitlab.com/ee/development/writing_documentation.html#location-and-naming-documents'
+    echo
+    exit 1
+  fi
+fi
+
 echo "✔ Linting passed"
 exit 0