How to downgrade / "brew install bazel@<version>" fails.

[drscotthawley]

Hi , thanks for preparing this. I'm a bit stuck, and I'm wondering if the README could include information about not only how to upgrade, but also how to downgrade.
I landed here from Tensorflow issue tensorflow/tensorflow#25490
in which downgrading bazel to 0.15.0 was suggested. So...

$ brew install bazel@0.15.0
Updating Homebrew...
==> Auto-updated Homebrew!
Updated 3 taps (homebrew/cask-versions, homebrew/core and homebrew/cask).
==> Updated Formulae
bazel ✔ ffmpeg ✔ apache-opennlp conjure-up crystal mpd ngircd streamlink

Error: No available formula with the name "bazel@0.15.0"
==> Searching for a previously deleted formula (in the last month)...
Error: No previously deleted formula found.
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
==> Searching taps on GitHub...
Error: No formulae found in taps.

Let's see what versions are available.

$ brew search bazel
==> Formulae
bazel ✔ bazelbuild/tap/bazel ✔ bazelbuild/tap/ibazel

? No version numbers listed?

Ok, finally let's try brew switch:

$ brew switch bazel 0.15.0
Error: bazel does not have a version "0.15.0" in the Cellar.
bazel installed versions: 0.22.0

? Would appreciate any help.

[cre8ivejp]

Same issue here.
There is any update on this?

[jamiesnape]

In general downgrading a homebrew formula is not supported. brew install https://raw.githubusercontent.com/Homebrew/homebrew-core/bab70bd0f3bad4dbd755ec4e5357d8fd782f89d6/Formula/bazel.rb may work (you would need to uninstall any other versions of bazel formulae first). You cannot add an arbitrary @{version} after a formula name, since each “version” is actually a separate formulae that must be explicitly created. IIRCbrew switch will only work if you previously installed that version and have not cleaned it up.

[SystemErrorWang]

@jamiesnape would you please tell me what should i do if i want to install bazel0.21.0? Failed to compose the correct url myself.

[jamiesnape]

Look at https://github.com/bazelbuild/homebrew-tap/commits/master/Formula/bazel.rb for the 0.21.0 release and you will see it was commit 42a4bf1 on December 20th, 2018.

Hence:

brew install https://github.com/bazelbuild/homebrew-tap/blob/42a4bf1f4411084321e95f89c0653fe62f74ae10/Formula/bazel.rb

[Imranmkt]

How to install bazel 0.24.1 on Mac ? #jamiensnape

[jamiesnape]

Use the same process as the previous comment explains. I am afraid I cannot give instructions for reverting arbitrary versions of bazel.

@katre @philwo Can you close this issue? It is not this tap's problem at all.

[katre]

Closing this since it's not something Bazel's homebrew-tap can fix.

Thanks @jamiesnape for help answering.

[farazBhatti]

@Imranmkt try:
brew install https://github.com/bazelbuild/homebrew-tap/blob/b515f2b67ce6bc8c3c23e63de6235f130f868acf/Formula/bazel.rb

[Imranmkt]

@farazBhatti Thank you for your comment. I tried the link to install bazel but it's showing unexpected syntax error.

Error: bazel: /Users/imran/Library/Caches/Homebrew/Formula/bazel.rb:7: syntax error, unexpected '<'

[plucury]

@Imranmkt Have try with brew install https://raw.githubusercontent.com/bazelbuild/homebrew-tap/b515f2b67ce6bc8c3c23e63de6235f130f868acf/Formula/bazel.rb

[farazBhatti]

@Imranmkt , i think a new thread should be opened for your problem so that other people facing problem same as your's can also be benefited. we can discuss this issue on the new thread

[powderluv]

The URL has changed. I have been able to install .26.1 to build tensorflow 2.0 with
brew install https://raw.githubusercontent.com/bazelbuild/homebrew-tap/c8a0ccc2a8b442d9887d88c6380f835f533ffd47/Formula/bazel.rb

[envil]

To get install URL for your desired version, get the raw link of the bazel.rb, for example:
https://raw.githubusercontent.com/bazelbuild/homebrew-tap/42a4bf1f4411084321e95f89c0653fe62f74ae10/Formula/bazel.rb

then

brew install <YOUR_URL HERE>

[jvmncs]

a better solution to this problem:

brew tap bazelbuild/tap
brew extract bazel bazelbuild/tap --version X.X.X