Symlinks in opt and LinkedKegs point directly at a keg in the cellar, so
only resolving one symlink should suffice, and make it clear what path
we are actually interested in.
In order to allow kegs built with the same version but differing formula
revisions to coexist, we must encode the revision as part of the keg's
name. This is necessary to actually perform an upgrade, as we cannot
upgrade a keg in-place, and temporarily moving it pending the result of
the upgrade is error-prone and potentially slow.
To accomplish this, we introduce a new Formula#pkg_version method that
concatenates the active_spec version with the formula revision. An
exception is made for a formula that has no revision: the tag is
omitted. This preserves compatibility with existing installations.
Still in alpha state.
Handles defaults and merging changes with new versions.
Enable by setting the HOMEBREW_GIT_ETC environment variable.
ClosesHomebrew/homebrew#15751.
ClosesHomebrew/homebrew#17713.
If the `src` in the Cellar of a formula is a symlink to another dir
in the same Cellar (for example `Frameworks/QtGui.framework` is a
symlink to `lib/QtGui.framework`), then we should make a symlink
directly instead of possibly creating an empty dir.
This is needed because Ruby's `find` does not follow symlinks (newer
versions can, but we have to support 10.8 for a long time).
Currently this probably only occurs for Qt, where we put symlinks
into the Cellar/Frameworks and the frameworks linking code is a bit
special to create a directory to "merge" together different versions
of the same framework from different formulae. See `python` and
`python3`; both install `Python.framework` and only one can be the
`Current` but the other should still be put into
`Python.framework/Versions`. Therefore `Python.framework` has to
be a dir and no symlink.
Gnome desktop support has a lot of folders in share that should be created
directly in share, rather than shared.
Add these folders to keg, and don't link any icon cache files into share.
ClosesHomebrew/homebrew#20340.
