repeat-thyself.sh

#!/bin/bash
#
# Build repeatr repeatedly with repeatr.
#
# If you don't have repeatr on your path yet, you can
# use `./goad sys` to install it to your local `/usr/bin/`,
# or `./goad install` to update a copy in `./.gopath/bin/`.
#
set -euo pipefail

if [ -x .gopath/bin/repeatr ]; then PATH=$PWD/.gopath/bin/:$PATH; fi
if [ ! -d .git ]; then echo "this script assumes it is run from a local git repo containing repeatr." 1>&2 ; exit 1 ; fi



### Set values for metadata our build injects for debugging purposes.
#  These are used by go-generate (see `cli/go.version.tmpl`);
#  In order to produce consistent outputs, we have to affix them.

# Pick out the current head hash.
# Of course you could use any commit hash you want.
GITCOMMIT=${GITCOMMIT:-$(git rev-parse HEAD)}

# Nil builddate by default.  But if you want to set one, go ahead.
BUILDDATE=${BUILDDATE:-"xxx"}

# CI requires some special modes, but you probably don't on localhost.
CI_FLAGS=${CI_FLAGS:-}



### Assemble the full formula
# This is mostly just taking our metadata variables above, and injecting them.
Formula="$(cat <<EOF
inputs:
	"/":
		type: "tar"
		hash: "uJRF46th6rYHt0zt_n3fcDuBfGFVPS6lzRZla5hv6iDoh5DVVzxUTMMzENfPoboL"
		silo: "http+ca://repeatr.s3.amazonaws.com/assets/"
	"/app/go/":
		type: "tar"
		hash: "vbl0TwPjBrjoph65IaWxOy-Yl0MZXtXEDKcxodzY0_-inUDq7rPVTEDvqugYpJAH"
		silo: "https://storage.googleapis.com/golang/go1.5.linux-amd64.tar.gz"
	"/task/repeatr/":
		type: "git"
		hash: "${GITCOMMIT}"
		silo:
			- "."
			- "https://github.com/polydawn/repeatr.git"
action:
	command:
		- "/bin/bash"
		- "-c"
		- |
			#!/bin/bash
			export GOROOT=/app/go/go
			export PATH=\$PATH:/app/go/go/bin
			>&2 echo building...
			./goad install
			>&2 echo build complete!
	cwd: "/task/repeatr/"
	env:
		"GITCOMMIT": "${GITCOMMIT}"
		"BUILDDATE": "${BUILDDATE}"
outputs:
	"executable":
		type: "tar"
		mount: "/task/repeatr/.gopath/bin/"
		silo: "file://repeatr.tar"
EOF
)"


### run it!
time repeatr run $CI_FLAGS <(echo "${Formula}")