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#!/bin/sh
# Copied from https://raw.githubusercontent.com/docker-library/golang/master/1.9-rc/stretch/go-wrapper
# Copied into Docker images.
set -e
usage() {
base="$(basename "$0")"
cat <<EOUSAGE
usage: $base command [args]
This script assumes that is is run from the root of your Go package (for
example, "/go/src/app" if your GOPATH is set to "/go").
In Go 1.4, a feature was introduced to supply the canonical "import path" for a
given package in a comment attached to a package statement
(https://golang.org/s/go14customimport).
This script allows us to take a generic directory of Go source files such as
"/go/src/app" and determine that the canonical "import path" of where that code
expects to live and reference itself is "github.com/jsmith/my-cool-app". It
will then ensure that "/go/src/github.com/jsmith/my-cool-app" is a symlink to
"/go/src/app", which allows us to build and run it under the proper package
name.
For compatibility with versions of Go older than 1.4, the "import path" may also
be placed in a file named ".godir".
Available Commands:
$base download
$base download -u
(equivalent to "go get -d [args] [godir]")
$base install
$base install -race
(equivalent to "go install [args] [godir]")
$base run
$base run -app -specific -arguments
(assumes "GOPATH/bin" is in "PATH")
EOUSAGE
}
# make sure there is a subcommand specified
if [ "$#" -eq 0 ]; then
usage >&2
exit 1
fi
# "shift" so that "$@" becomes the remaining arguments and can be passed along to other "go" subcommands easily
cmd="$1"
shift
goDir="$(go list -e -f '{{.ImportComment}}' 2>/dev/null || true)"
if [ -z "$goDir" -a -s .godir ]; then
goDir="$(cat .godir)"
fi
dir="$(pwd -P)"
if [ "$goDir" ]; then
goPath="${GOPATH%%:*}" # this just grabs the first path listed in GOPATH, if there are multiple (which is the detection logic "go get" itself uses, too)
goDirPath="$goPath/src/$goDir"
mkdir -p "$(dirname "$goDirPath")"
if [ ! -e "$goDirPath" ]; then
ln -sfv "$dir" "$goDirPath"
elif [ ! -L "$goDirPath" ]; then
echo >&2 "error: $goDirPath already exists but is unexpectedly not a symlink!"
exit 1
fi
goBin="$goPath/bin/$(basename "$goDir")"
else
goBin="$(basename "$dir")" # likely "app"
fi
case "$cmd" in
download)
set -- go get -v -d "$@"
if [ "$goDir" ]; then set -- "$@" "$goDir"; fi
set -x; exec "$@"
;;
install)
set -- go install -v "$@"
if [ "$goDir" ]; then set -- "$@" "$goDir"; fi
set -x; exec "$@"
;;
run)
set -x; exec "$goBin" "$@"
;;
*)
echo >&2 'error: unknown command:' "$cmd"
usage >&2
exit 1
;;
esac
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