formula: add .keepme files to prevent cleanup #19138
Merged
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Allow the use of
.keepme
files inside a keg to prevent the cleanup.Rather than having a binary state of "never cleanup if
.keepme
is present" and "can cleanup without", instead a.keepme
file is essentially providing reference counting.It can contain one or more lines which reference files on disk. If the file exists, the
.keepme
file will prevent cleanup. If/when it does not:brew cleanup
will happily cleanup this keg (providing all other conditions apply).