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Problem: tests: Test_recover_corrupted_swap_file() cannot handle
symlinks
Solution: Use writefile(readblob()) instead (Vladimír Marek)
Test_recover_corrupted_swap_file1() copies prebuilt corrupt swap samples
before recovering them. In an out-of-source-tree build those sample
files may be symlinks into the source tree. filecopy() preserves
symlinks, so the copied target may remain a symlink. Recovery opens
swap files with O_NOFOLLOW, so that copied symlink cannot be opened.
Read the sample as a blob and write it back so the recovery target is a
real swap file.
closes: vim/vim#20561
88cbd00312
Co-authored-by: Vladimír Marek <vlmarek13@gmail.com>