fix(deploy): retain the active release when rollback failsHEADmain

[Problem]
- Failed rollback could delete a directory still used by current.

[Root Cause]
- Failure cleanup did not check the active symlink target.

[Solution]
- Preserve release directories still referenced by current.
- Document the self-hosted publishing and manual rollback procedure.

[Impact]
- Blog deployment cleanup is safer; article content remains unchanged.

1 files changed, 12 insertions, 2 deletions

diff --git a/deploy/scripts/build.sh b/deploy/scripts/build.sh
index b76d6ec0..e598700a 100755
--- a/deploy/scripts/build.sh
+++ b/deploy/scripts/build.sh
@@ -113,12 +113,22 @@ while :; do
               && echo "rolled back to $prev" >> "$LOG" \
               || echo "ROLLBACK FAILED: current -> $DEST_NAME stays" >> "$LOG"
           fi
-          rm -rf -- "$RELEASES/$DEST_NAME"
+          live=$(readlink "$RELEASES/current" 2>/dev/null || true)
+          if [ "$live" != "$DEST_NAME" ]; then
+            rm -rf -- "$RELEASES/$DEST_NAME"
+          else
+            echo "kept $DEST_NAME: current still points at it" >> "$LOG"
+          fi
           RC_LAST=1
         fi
       fi
       if [ "$OK" -eq 0 ]; then
-        rm -rf -- "$RELEASES/$DEST_NAME"
+        live=$(readlink "$RELEASES/current" 2>/dev/null || true)
+        if [ "$live" != "$DEST_NAME" ]; then
+          rm -rf -- "$RELEASES/$DEST_NAME"
+        else
+          echo "kept $DEST_NAME: current still points at it" >> "$LOG"
+        fi
         echo "==== build $TS FAILED at publish, previous release kept ====" >> "$LOG"
         RC_LAST=1
       fi