investigate dir not being reported as empty, blocking deletion

[leonstafford]

on a 2nd run (at least one existing archive dir), getting warning that archive dir isn't empty:

./wp-content
./wp-content/themes
./wp-content/themes/twentytwenty
./wp-content/themes/twentytwenty/inc

but nothing in the inc dir.

maybe environment specific

[thegulshankumar]

Steps to repro

1. Upgrade from v6 to latest on existing site
2. click "static site export"
3. It will return Failed during "Analyzing site... this may take a few minutes (but it's worth it!)", please check your Export Log from Logs tab or email support.
4. Error 502 ajax.php request
5. Below is sample logs
6. Solution: Deleting previous directories

root@example.com:/var/log/nginx# tail -f error.log
2020/05/24 03:20:58 [error] 1397#1397: *9 FastCGI sent in stderr: "PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/gp-premium/backgrounds): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugns/gp-premium/secondary-nav): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/gp-premium): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/tablepress/admin): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Wa                   rning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/tablepress): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/wp-last-modified-info/admin/assets/lib/selectize): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/wp-last-modified-info/admin/assets/lib): Directory not empty in /var/www/html/wp-content/plugins/static-html-output-plugin/src/FilesHelper.php on line 34PHP message: PHP Warning:  rmdir(/var/www/html/wp-content/uploads/wp-static-html-output-1590242843/wp-content/plugins/wp-last-modified-info/admin/assets): Directory not empty in /va
2020/05/24 03:20:58 [error] 1397#1397: *9 upstream sent too big header while reading response header from upstream, client: 103.74.109.129, server: example.com.org, request: "POST /wp-admin/admin-ajax.php HTTP/2.0", upstream: "fastcgi://unix:/run/php/php7.4-fpm.sock:", host: "www.example.com.org", referrer: "https://www.example.com.org/wp-admin/admin.php?page=statichtmloutput"
^C
root@example.com:/var/log/nginx# cd /var/www/html/wp-content/uploads/wp-static-html-output-1590242843/
root@example.com:/var/www/html/wp-content/uploads/wp-static-html-output-1590242843# ls
wp-content
root@example.com:/var/www/html/wp-content/uploads/wp-static-html-output-1590242843# cd ..
root@example.com:/var/www/html/wp-content/uploads# ls
2019                                 wp-static-html-output-1590242843  wp-static-html-output-1590246619  wp-static-html-output-1590281738  wp-static-html-output-1590288791  wp-static-html-output-1590290230
2020                                 wp-static-html-output-1590246419  wp-static-html-output-1590246654  wp-static-html-output-1590287887  wp-static-html-output-1590288886  wp-static-html-output-1590290255
WP2STATIC-CURRENT-ARCHIVE.txt        wp-static-html-output-1590246421  wp-static-html-output-1590246755  wp-static-html-output-1590288167  wp-static-html-output-1590289031  wp-static-html-output-1590290458
WP-STATIC-CRAWLED-LINKS.txt          wp-static-html-output-1590246468  wp-static-html-output-1590246756  wp-static-html-output-1590288281  wp-static-html-output-1590289465  WP-STATIC-INITIAL-CRAWL-LIST.txt
WP-STATIC-DISCOVERED-URLS-TOTAL.txt  wp-static-html-output-1590246489  wp-static-html-output-1590246757  wp-static-html-output-1590288473  wp-static-html-output-1590289931  WP-STATIC-INITIAL-CRAWL-TOTAL.txt
WP-STATIC-EXPORT-LOG.txt             wp-static-html-output-1590246512  wp-static-html-output-1590250454  wp-static-html-output-1590288543  wp-static-html-output-1590290121  WP-STATIC-MODIFIED-CRAWL-LIST.txt
WP-STATIC-FINAL-CRAWL-LIST.txt       wp-static-html-output-1590246555  wp-static-html-output-1590250615  wp-static-html-output-1590288653  wp-static-html-output-1590290127  WP-STATIC-PROGRESS.txt
wp-static-html-output-1590237127     wp-static-html-output-1590246562  wp-static-html-output-1590281737  wp-static-html-output-1590288689  wp-static-html-output-1590290165  WP-STATIC-TOTAL-FILES-TO-DEPLOY.txt
root@example.com:/var/www/html/wp-content/uploads# rm -rf wp-static*
root@example.com:/var/www/html/wp-content/uploads# ls
2019  WP2STATIC-CURRENT-ARCHIVE.txt  WP-STATIC-DISCOVERED-URLS-TOTAL.txt  WP-STATIC-FINAL-CRAWL-LIST.txt    WP-STATIC-INITIAL-CRAWL-TOTAL.txt  WP-STATIC-PROGRESS.txt
2020  WP-STATIC-CRAWLED-LINKS.txt    WP-STATIC-EXPORT-LOG.txt             WP-STATIC-INITIAL-CRAWL-LIST.txt  WP-STATIC-MODIFIED-CRAWL-LIST.txt  WP-STATIC-TOTAL-FILES-TO-DEPLOY.txt
root@example.com:/var/www/html/wp-content/uploads# rm -rf WP-STATIC*
root@example.com:/var/www/html/wp-content/uploads# ls
2019  2020  WP2STATIC-CURRENT-ARCHIVE.txt