The TMPDIR was being automatically cleared and recreated even if it didn't already exist when TermuxService was stopped. This left an empty TMPDIR in the PREFIX directory when termux-reset was run and on termux restart the bootstrap wasn't installed again because PREFIX directory already existed. This resulted in a broken environment since no binaries/libs existed under PREFIX and /system/bin/sh was loaded.

This issue was created due to v0.109.

The TermuxInstaller.setupBootstrapIfNeeded() previously only checked if PREFIX directory existed or not to decide whether to install bootstrap or not. Now it will also check if its empty or only contains the tmp directory, since in that case the PREFIX must be deleted and bootstrap reinstalled, otherwise a broken environment will be loaded since no termux binaries/libs would exist.

It will now also delete any file at the prefix or staging prefix path, even if its not a directory. If the user does not want the bootstrap to be installed for some reason, then any other file other than "tmp" can be created under PREFIX.

This reverts commit 5d911ef.

Changes were made to bootstrap reinstallation logic in 107927f, but it wasn't considering that PREFIX may be a symlink file to a directory instead of a directory file. With this commit, the previous behaviour of termux is restored where PREFIX can optionally be a symlink to a valid directory where the symlink isn't broken/dangling.