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And, if it isn't, print more helpful debugging messages.
Fixes #1456.
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These don't make sense to be tied to the `HOMEBREW_REPOSITORY` but
instead should live in the `HOMEBREW_PREFIX` as they all relate to its
state.
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Since #292, HOMEBREW_CACHE was moved to a per-user directory. This makes
it unsuitable to store global lock files on multiple users environment.
Therefore, introducing a global lock directory `/Library/Lock.d` to
store lock files from formula lockers as well as `brew update`.
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This avoids weird issues with custom Rubies.
Closes #253.
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a Bash implementation of lock using `flock(2)`.
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