Improve fork check in Git hooks installation

This change ensures that the repository is named "lab0-c" both
locally and on GitHub while verifying that it is correctly forked
from "sysprog21/lab0-c." The validation now relies on the GitHub
API to check both the fork status and the parent repository name.

The previous approach using grep and sed for parsing has been replaced
with Git commands and awk to extract the repository owner and name.
Additional validation ensures the repository name is "lab0-c",
and fork verification has been improved by directly analyzing
the GitHub API response.

Author: willy-liu

scripts/install-git-hooks

@@ -31,7 +31,8 @@ fi
 ((CURRENT_STEP++))
 progress "$CURRENT_STEP" "$TOTAL_STEPS"
 
-ACCOUNT=$(git config -l | grep -w remote.origin.url | sed -e 's/^.*github.com[\/:]\(.*\)\/lab0-c.*/\1/')
+ACCOUNT=$(git config --get remote.origin.url | awk -F'[:/]' '{print $(NF-1)}')
+REPO_NAME=$(git config --get remote.origin.url | awk -F'[:/]' '{gsub(/\.git$/, "", $NF); print $NF}')
 
 CURL=$(which curl)
 if [ $? -ne 0 ]; then
@@ -43,25 +44,24 @@ CURL_RES=$(${CURL} -s \
 https://api.github.com/repos/${ACCOUNT}/lab0-c/actions/workflows)
 
 TOTAL_COUNT=$(echo ${CURL_RES} | sed -e 's/.*"total_count": \([^,"]*\).*/\1/')
-case ${TOTAL_COUNT} in
-  *"Not Found"*)
-    throw "Check your repository. It should be located at https://github.com/${ACCOUNT}/lab0-c"
-esac
+if [[ "$REPO_NAME" != "lab0-c" || "$TOTAL_COUNT" == *"Not Found"* ]]; then
+  throw "Check your repository. It should be located at https://github.com/${ACCOUNT}/lab0-c"
+fi
 
 # 3. Ensure this repository is frok from sysprog21/lab0-c'.
 ((CURRENT_STEP++))
 progress "$CURRENT_STEP" "$TOTAL_STEPS"
 
 if [[ "${ACCOUNT}" != "sysprog21" ]]; then
-  REPO_FORKED=$(${CURL} -s \
-                -H "Accept: application/vnd.github.v3+json" \
-                https://api.github.com/repos/${ACCOUNT}/lab0-c | grep -m 1 fork)
-  case ${REPO_FORKED} in
-    *true*)
-      ;;
-    *)
-      throw "Your repository MUST be forked from 'sysprog21/lab0-c'."
-  esac
+  RESPONSE=$(${CURL} -s -H "Accept: application/vnd.github.v3+json" \
+            "https://api.github.com/repos/${ACCOUNT}/lab0-c")
+
+  IS_FORK=$(echo "$RESPONSE" | sed -n 's/.*"fork": \(true\|false\).*/\1/p' | head -n1)
+  PARENT_NAME=$(echo "$RESPONSE" | awk -F'"' '/"parent": \{/{flag=1} flag && /"full_name":/{print $4; exit}')
+
+  if [[ "$IS_FORK" != "true" || "$PARENT_NAME" != "sysprog21/lab0-c" ]]; then
+    throw "Your repository MUST be forked from 'sysprog21/lab0-c'."
+  fi
 fi
 
 # 4. Check GitHub Actions