Some setups (e.g. a default `tmux` session) will result in a user
starting multiple nested login shells. This is a problem for the way we
currently handle `shellenv` because a login shell invokes
`/usr/libexec/path_helper` which will prepend the contents of
`/etc/paths` and `/etc/paths.d` to `PATH`. In particular, the second
login shell will place `brew` further down the `PATH` than desired in a
non-`/usr/local` prefix, since `brew shellenv` will no longer produce
output the second time around.
Let's fix this by replacing the check that `brew` is in `PATH` with a
check that `${HOMEBREW_PREFIX}/bin` precedes `/usr/bin` in `PATH`.
Fixes#11851, #11883, Homebrew/discussions#2547.
See also:
- Homebrew/discussions#2237
- https://superuser.com/questions/544989/does-tmux-sort-the-path-variable
There's a few bits of functionality that Homebrew has changed over the
years, makes sense as a sensible default but some people find really
annoying:
- automatically running `brew update`
- automatically running `brew cleanup`
- automatically upgrading outdated dependents
- automatically reinstalling broken dependents
For each of these: let's improve the documentation of the commands
whose behaviour is changed and the environment variables themselves.
Whenever the `sysctl` call does not match `"Apple"*`, we can be sure
that `HOMEBREW_PROCESSOR` is `Intel`, so there's no need for this
additional check.
The previous commit only prevented the installation of an Intel Portable
Ruby into `/opt/homebrew` prefix. Let's actually install an ARM64
Portable Ruby there too.
Since `HOMEBREW_PROCESSOR` is populated using `uname -m`, this will
register as `Intel` even when a native ARM install is running under
Rosetta.
Let's work around this by checking `sysctl -n machdep.cpu.brand_string`.
On my Intel machine:
❯ sysctl -n machdep.cpu.brand_string
Intel(R) Core(TM) i3-1000NG4 CPU @ 1.10GHz
On Apple Silicon:
brew@HMBRW-A-001-M1-001 ~ % sysctl -n machdep.cpu.brand_string
Apple M1
The case of a Rosetta installation of Homebrew is already handled below
the proposed change.
FixesHomebrew/discussions#2434.
This allows specifying the path of an SSH config file that Homebrew should use instead of the default, `~/.ssh/config`, when fetching Git repos over SSH.
