Having Trouble Using "brew link" to switch between PostgreSQLs - macos

I want to run a Rails app on Heroku so I installed PostgreSQL on my Snow Leopard machine using Homebrew. Currently, brew installs 9.1.2 into /usr/local/Cellar/postgresql. After some research, I discovered that the free, shared version of Heroku requires 8.3.x. While homebrew-alt doesn't have 8.3, it does have 8.4 so I downloaded it instead and it installed into /usr/local/Cellar/postgresql8. I then confirmed that I am able to create and run databases on each version. Thinking that I could use "brew [link | unlink] to switch back and forth, I ran "brew unlink postgresql8" and then "brew link postgresql". However, running the latter command results in this error:
Linking /usr/local/Cellar/postgresql/9.1.2...
Error: Cannot link postgresql
Another version is already linked: /usr/local/Cellar/postgresql/9.1.2
Is there any way to do this (switch back and forth) or am I misunderstanding how brew link/unlink is supposed to be used?
By the way, "brew list" shows "postgresql" and "postgresql8" so I don't think it's the case that I should say "brew link postgresql9".
Thanks.

Use brew switch, which is an extension shipped with Homebrew. In your case, you could use 8.4 by running
$ brew switch postgresql 8.4

Thanks, mipadi! That did the trick. There was only one additional thing that I needed to do. The 'brew switch' command assumes all versions of postgresql are installed in /usr/local/Cellar/postgresql. That was not the case with version 8.4.8 as it was installed in /usr/local/Cellar/postgresql8. Consequently I had to create a symbolic link to point to this older version:
cd /usr/local/Cellar/postgresql
ln -s ../postgresql8/8.4.8 8.4.8
Naturally, it also makes sense to keep your database clusters in separate directories:
/usr/local/var/postgres/8.4.8
/usr/local/var/postgres/9.1.2

Related

How to change Homebrew's prefix?

I'm using MACOS M1, and started to install brew under ARM. Then at the other day, I installed some formula under x86.
When I run a command
brew doctor
And I got this message
Some of Homebrew's bottles (binary packages) can only be used with the default
prefix (/usr/local).
You will encounter build failures with some formulae.
Please create pull requests instead of asking for help on Homebrew's GitHub,
Twitter or any other official channels. You are responsible for resolving
any issues you experience while you are running this
unsupported configuration.
How to change the prefix to /usr/local/?
When I run which -a brew I got this result
/opt/homebrew/bin/brew
/usr/local/bin/brew
Thanks in advance.
I had the same issue because I did not installed the homebrew from the local path on my terminal.
I just uninstalled the homebrew, installed it again (from the local path this time) and it is fine now.
To uninstall Homebrew, run the uninstall script from the HomeBrew/install repository.

Why do I have two versions of sqlite?

On my iMac (10.13.6, which is as far as it can be upgraded), I typed sqlite3 and it said I was running version 3.19.3.
So I tried upgrading with brew upgrade sqlite3 but it said sqlite3 3.28.0 already installed. The SQLite site says 3.28.0 is currently the most up to date version.
How come I have two different versions of SQLite? Does Brew install to a different location than the standard OSX version? And if so, how do I either use the upgraded brew version or upgrade the OSX version?
In general, homebrew installs links for all binaries it installs in /usr/local/bin. You can see that by running:
ls -l /usr/local/bin
So, you need to add that directory to your PATH:
export PATH=/usr/local/bin:$PATH
You likely want to do this in your login profile, which is probably $HOME/.profile so that it gets set every time you login.
I ended up creating alias command in the .zshrc file like so:
alias sqlite=/usr/local/opt/sqlite/bin/sqlite3
Don't know if that was the best way, though.

MongoDB installed via Homebrew not working

I installed MongoDB via Homebrew (following http://docs.mongodb.org/manual/tutorial/install-mongodb-on-os-x/) but it's not working.
Typing mongod at shell prompt gives me:
-bash: mongod: command not found
Not sure if I need to add something for Homebrew to my PATH env var?
I can see Mongo is installed under /usr/local/Cellar/mongodb – but am assuming I don't need to add everything I install via homebrew to the path? Also, assuming I can run mongod from any directory or am I actually meant to be in install directory?
When I run brew doctor I get:
Warning: You have unlinked kegs in your Cellar
Followed by a list of 3 items which includes MongoDB – but I'm not sure how I'm meant to link them?
Works perfectly
brew update
brew tap mongodb/brew
brew install mongodb-community#4.2
For latest version, check https://docs.mongodb.com/manual/release-notes/
You're getting this error because your 'brew' install failed to create the correct symlinks in /usr/local/bin. As a result, the shell can't find the mongo executables in your $PATH. You can fix this using the following steps:
Check the permissions on /usr/local/bin and make sure that you own that directory and have write permissions on it
$ ls -ld /usr/local/bin
Once you've fixed that, run 'brew link' to fix the symlinks
$ brew link mongodb
If you are on mongodb-community#4.0. You can try to reinstall with brew reinstall mongodb-community#4.0.
Then I get the following hint:
==> Caveats
mongodb-community#4.0 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.
If you need to have mongodb-community#4.0 first in your PATH run:
echo 'export PATH="/usr/local/opt/mongodb-community#4.0/bin:$PATH"' >> ~/.bash_profile
So you can just copy the echo command and restart your shell!
Copied from a different channel running these commands in the terminal updated the installation/configuration issues as described in OP
brew tap mongodb/brew
brew install mongodb-community
brew services start mongodb-community
I faced the same problem and this solution seemed to work for me. I had previously uninstalled mongodb and reinstalled it through homebrew which gave me a bunch of problems. This solution seemed to work just fine.
brew uninstall --force mongodb
brew cleanup -s mongodb
brew cleanup --prune-prefix
brew install mongodb
It works from the directory since the sh searches the ENV path and then the cwd for a program named mongod. I have been looking around a little and it seems that the default install of MongoDB (I am not a Mac user) does not install a rc or init script for which sh to understand it's running behaviour as stated here:
http://docs.mongodb.org/manual/tutorial/install-mongodb-on-os-x/#using-mongodb-from-homebrew-and-macports
The packages installed with Homebrew and MacPorts contain no control
scripts or interaction with the system’s process manager.
If you have configured Homebrew and MacPorts correctly, including
setting your PATH, the MongoDB applications and utilities will be
accessible from the system shell. Start the mongod process in a
terminal (for testing or development) or using a process management
tool.
So you must actually define (as you said) MongoDBs path, here is an example: https://snipt.net/sido/installing-mongodb-on-os-x/
Edit: the example is not mine. I just stole it from it's user: https://snipt.net/sido/

Unable to get MacPort functionality after installing Xcode 4.3

I am having trouble getting MacPorts to function properly. I just installed OSX Lion 10.7.3 I downloaded and installed MacPorts first, and then after reading the requirements, I downloaded Xcode4.3 from the App Store, and then installed it. I launched Xcode and it looks to be operational and functional. However when I attempted to port with MacPorts, it gave me this error message(excerpt):
Warning: xcodebuild exists but failed to execute
Warning: Xcode does not appear to be installed; most ports will likely fail to build.
I followed the advice from:
How do i install additional packages for Xcode on OSX Lion to allow MacPorts to work
and installed command_line_tools_for_xcode from the Preferences within Xcode. I closed Xcode, and again got the errors:
$ sudo port install libsocketsPassword:
Warning: xcodebuild exists but failed to execute
Warning: Xcode does not appear to be installed; most ports will likely fail to build.
---> Computing dependencies for libsockets
---> Dependencies to be installed: openssl zlib
---> Extracting zlib
Error: Couldn't determine your Xcode version (from '/usr/bin/xcodebuild -version').
Error:
Error: If you have not installed Xcode, install it now; see:
Error: http://guide.macports.org/chunked/installing.xcode.html
Error:
Error: Target org.macports.extract returned: unable to find Xcode
Error: Failed to install zlib
Log for zlib is at: /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_archivers_zlib/zlib/main.log
Error: The following dependencies were not installed: openssl zlib
Error: Status 1 encountered during processing.
I am uncertain where to go next with this. How do i trouble shoot my Xcode and MacPort interface?
In theory this should work if you have Xcode4.3 installed (in /Applications):
$ sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer/
(And you've installed the optional command line tools)
Everything will start working fine after installation of "Command Line Tools for Xcode" package.
You can get it from here: https://developer.apple.com/downloads/index.action#
Please see the MacPorts migration instructions for Xcode 4.3.
The instructions are pretty involved. You need to run xcode-select to set a new tools path, update developer_dir in macports.conf (as described by Henk Poley), re-install MacPorts (ouch), and finally uninstall and re-install all of your ports (double ouch).
Edit: libpvx still wouldn't install after the above. Two extra steps were required:
sudo ln -s /Developer /
sudo ln -s /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs /SDKs
YMMV if you have different ports installed!
Also in /opt/local/etc/macports/macports.conf change the line with developer_dir to point to / instead of /Developer.
After
sudo xcode-select -switch /Applications/Xcode.app
I also had to run
sudo xcodebuild -license
and accept the licence
Here is a solution that has worked for me:
Install Command Line Tools for Xcode
Xcode -> Preferences -> Downloads
Help MacPorts find the right Xcode folder
sudo /usr/bin/xcode-select -switch /Applications/Xcode.app
Create symbolic links for clang compilers as they now live elsewhere
sudo ln -s `which clang` /Applications/Xcode.app/Contents/Developer/usr/bin/
sudo ln -s `which clang++` /Applications/Xcode.app/Contents/Developer/usr/bin/
Try using trunk, there's no release supporting Xcode 4.3 yet.
Setting the developer path in /opt/local/etc/macports.conf works for me,
developer_dir /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
since most of the compilers are stored there now instead of /usr/bin under Developer.
None of this works for me. Wait for macports to release a new version that officially supports XCode 4.3+
sudo mv /usr/bin/xcodebuild /usr/bin/xcodebuild.old
sudo ln -s /Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild /usr/bin/xcodebuild
Starting with Xcode 4.3, the command-line build tools are not installed by default. Launch Xcode, open the Preferences, and go to the Downloads tab. From there you should have an option to install the command-line tools.
You can also download them from the web here: https://developer.apple.com/downloads/index.action
Disclaimer: I haven't installed Xcode 4.3 yet. I have only read about it on the web.
As of 27/2/2012, the official suggestion from MacPorts seems to be to not use XCode 4.3 and instead use 4.1 through 4.2.1, which can be downloaded from Apple.
There is a bug ticket which might be useful to follow the evolution of this.
Incidentally, and as reported in my comment #11 in that bug report, I am able to build ports without warnings by using the 2 most sane-looking suggestions found in this question: sudo /usr/bin/xcode-select -switch /Applications/Xcode.app/Contents/Developer and changing developer_dir in /opt/local/etc/macports/macports.conf to /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain
I have macports installed without admin/root privileges, so I was unable to test the xcode-select answers. However, I observed that Pall Melsted's answer worked, but not initially. What I found out was that I had not accepted the Xcode 4.5 license agreement!
If you have just installed Xcode for the purposes of macports, and you haven't accepted the Xcode license yet, you might get the error presented by the original post. When I checked my Xcode version using /usr/bin/xcodebuild -version, I was given the prompt to read and accept the license. After doing so, and after having made the changes suggested by Pall to the macports.conf developer_dir, it all works now.
As alternative: you can make downgrade of Xcode to 4.2.1 version. DMG of Xcode 4.2.1 placed here: https://developer.apple.com/downloads/index.action
After this MacPorts became works fine for me.
This is fixed in MacPorts 2.0.4.
To upgrade:
Download MacPorts 2.0.4 from the install site or run sudo port selfupdate.
Run the MacPorts migration described here to reinstall all ports. This is painful but required to get back to a working state.
You should definitely run sudo xcode-select -switch /Applications/Xcode.app like everyone here says, that'll fix many problems, but certainly not all.
Afaik, all the remaining problems exist within the configuration information for various packages. You might simply reinstall MacPorts as described in the migration instructions, but I found another solution.
You should begin finding all effected port files using commands like grep /Developer/ ..., after executing sudo bash and cd /opt/local naturally.
You should identify all effected ports by using port provides ..., which I piped through sed and sort | uniq. You could simply reinstall all these ports using either port -n upgrade --force ... or separate port uninstall ... and port install ... commands.
I recommend using one large port -n upgrade --force ... command to avoid duplicate rebuilds of dependencies, using the separate uninstall and install commands afterwards.
There are of course various ports for which /Developer exists only inside text config files, meaning you can fix them manually with sed -i -e 's/\/Developer//g' ..., but you cannot do so with binaries obviously.
I'm afraid you must at minimum rebuild all your Python and Perl installations, making this upgrade an ideal time to clean out packages that depend upon older versions, ala python26 and perl5.8.
There are several technically effected ports I decided against rebuilding like fuse4x-kext, who contained /Developer inside Library/Extensions/fuse4x.kext/Contents/MacOS/fuse4x but hasn't prevented sshfs from working correctly.
I had initially installed xcode 3.2.2, after which I installed 4.3. When I ran the xcode-select, I still got the same error about no xcode project in /Applications. I then dug into the /usr/bin/xcodebuild script and found out that this was working correctly, and another instance of xcodebuild (the one installed with xcode 4.3, not the one in /usr/bin) was being run and returning the error:
xcodebuild: error: The directory /Applications does not contain an Xcode project.
It seems the /usr/bin/xcode-select does not work for xcode 4.3, (it's compiled so you can't really see why it's not working). Strings doesn't give any clues. Good thing osx has strace.. oh wait.
Anyways, the best I could do was modify /opt/local/etc/macports.conf
and uncomment the line containing the path to the xcode installation. That seems to fix my problem for the most part.

How can I force Homebrew to install 64-bit PostgreSQL on OSX SL? Specifically the libpg.dylib file

I have been trying to install the Ruby PG gem, but kept getting the "Failed to build gem native extension." error.
After sifting through a lot of google results, I tried nearly every recommendation I came across, all without luck. However, I believe I've tracked down the source of the problem ... Homebrew.
Homebrew installed PostgreSQL 9.0.4, but only with the 32-bit libraries. As I am running Snow Leopard (10.6.8) with XCode 3.26, I need the 64-bit libraries in order to compile everything without library mismatch errors. But I cannot seem to find out how to force Homebrew to install them, even with ARCHFLAGS and ENV set to "-arch x86_64".
Suggestions, please :)
p.s. I found out that I only had 32-bit libraries installed by running:
file /usr/local/Cellar/postgresql/9.0.4/lib/libpq.5.3.dylib
which returned:
/usr/local/Cellar/postgresql/9.0.4/lib/libpq.5.3.dylib: Mach-O dynamically linked shared library i386
Update: re-installed Homebrew, which installed postgresql/9.1.1 and 64-bit shared libraries.
But another problem emerged, while installing the PG gem. For some reason it was looking for ginstall in /opt/local/bin. As I had removed MacPorts, that directory was also removed. I did find this solution:
mkdir -p /opt/local/bin/
sudo ln -s /usr/bin/install /opt/local/bin/ginstall
And now everything seems to be working ....
So it looks like my first install, using Homebrew, must have been done with regular Leopard.
Removing the Homebrew "Cell" directory and all of its contents, running the install script again, then doing "brew install" and "brew update" with all needed packages, got me the latest version of PostgreSQL, with 64-bit developer library.
And creating the above symbolic link fixed any left over errors from the MacPorts removal.
Now all is well :)

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