Bazel bash completion script requires git repo to build on macOS via MacPorts

[missa-prime]

Description of the problem / feature request:

After version 0.5.2, a git repo is required to build the Bazel bash completion script on macOS when attempting to install Bazel via MacPorts. The Portfile contains workaround code that deletes a temporary folder and creates a dummy repo to prevent the installation from failing. I'm not sure why all of this is necessary in the first place though.

Feature requests: what underlying problem are you trying to solve with this feature?

N/A

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

1. Make sure JDK 8 or newer is installed
2. Ensure that /etc/gitconfig file exists and user.name and user.email fields are populated
3. Install MacPorts from here
4. Remove the code below from /opt/local/var/macports/sources/rsync.macports.org/release/tarballs/ports/devel/bazel/Portfile:

# Get ready to build the bash completion script
file delete -force /var/tmp/_${name}_root

# build fails if it does not recognize this dir as a git repo
system -W ${worksrcpath} "git init"
system -W ${worksrcpath} "git add ."
system -W ${worksrcpath} "git commit -m GitRepo"

5. sudo port install bazel at a terminal prompt to install bazel

What operating system are you running Bazel on?

macOS 10.12.6

What's the output of bazel info release?

ERROR: The 'info' command is only supported from within a workspace.

Since I don't have a workspace handy, I'll provide the output of bazel version:

Build label: 0.9.0- (@non-git)
Build target: bazel-out/darwin-opt/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Fri Aug 1 19:08:22 +50104 (1518980756902)
Build timestamp: 1518980756902
Build timestamp as int: 1518980756902

If bazel info release returns "development version" or "(@non-git)", tell us how you built Bazel.

Bazel was built from source while being installed with MacPorts.

What's the output of git remote get-url origin ; git rev-parse master ; git rev-parse HEAD ?

N/A

Have you found anything relevant by searching the web?

No.

Any other information, logs, or outputs that you want to share?

Here is the type of error output you should see (assuming stdout and stderr are directed to a file) without the git repo:

Build successful! Binary is here: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_bazel/bazel/work/bazel-0.9.0-dist/output/bazel
xinstall: chdir(/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_bazel/bazel/work/bazel-0.9.0-dist/output)
xinstall: bazel -> /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_bazel/bazel/work/bazel-0.9.0-dist/bazel
Extracting Bazel installation...
.....................
Loading: 
Loading: 0 packages loaded
Analyzing: target //scripts:bazel-complete.bash (3 packages loaded)
Analyzing: target //scripts:bazel-complete.bash (4 packages loaded)
Analyzing: target //scripts:bazel-complete.bash (73 packages loaded)
Analyzing: target //scripts:bazel-complete.bash (75 packages loaded)
Analyzing: target //scripts:bazel-complete.bash (195 packages loaded)
INFO: Analysed target //scripts:bazel-complete.bash (195 packages loaded).
INFO: Found 1 target...
[0 / 2] [-----] BazelWorkspaceStatusAction stable-status.txt
ERROR: Process exited with status 128: Process exited with status 128
fatal: Not a git repository (or any of the parent directories): .git
Target //scripts:bazel-complete.bash failed to build
INFO: Elapsed time: 25.182s, Critical Path: 0.14s
FAILED: Build did NOT complete successfully
FAILED: Build did NOT complete successfully
Error: Failed to build bazel: child process exited abnormally
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_bazel/bazel/main.log for details.
Error: Follow https://guide.macports.org/#project.tickets to report a bug.
Error: Processing of port bazel failed

[jin]

According to the printed error (Error: Follow https://guide.macports.org/#project.tickets to report a bug.), please file a bug with MacPorts instead.