use go modules, tweak docker image

.gitignore

 vendor
+chart-server

Dockerfile

-FROM golang:1.9 AS build
-
-RUN curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
-
-WORKDIR /go/src/gitlab.ssec.wisc.edu/brucef/chart-server
+FROM golang:1.13-alpine AS build
+RUN apk add --no-cache git
+WORKDIR /code
 COPY . .
-RUN dep ensure && ./build.sh
-
+RUN ./build.sh
 
 
-FROM debian:buster-slim
-COPY --from=build /go/bin/chart-server .
-ENTRYPOINT ["./chart-server"]
-CMD ["$@"]
+FROM alpine:3.10
+# UID 1000
+ARG uid=1000
+COPY --from=build /code/chart-server /
+COPY entrypoint.sh /
+RUN mkdir /charts
+RUN apk add --no-cache dumb-init
+RUN adduser -DS -u $uid app
+USER app
+EXPOSE 8080
+WORKDIR /tmp
+ENTRYPOINT ["/entrypoint.sh"]
\ No newline at end of file

Gopkg.lock

-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  name = "github.com/gorilla/context"
-  packages = ["."]
-  revision = "08b5f424b9271eedf6f9f0ce86cb9396ed337a42"
-  version = "v1.1.1"
-
-[[projects]]
-  name = "github.com/gorilla/handlers"
-  packages = ["."]
-  revision = "7e0847f9db758cdebd26c149d0ae9d5d0b9c98ce"
-  version = "v1.4.0"
-
-[[projects]]
-  name = "github.com/gorilla/mux"
-  packages = ["."]
-  revision = "e3702bed27f0d39777b0b37b664b6280e8ef8fbf"
-  version = "v1.6.2"
-
-[[projects]]
-  name = "github.com/pkg/errors"
-  packages = ["."]
-  revision = "645ef00459ed84a119197bfb8d8205042c6df63d"
-  version = "v0.8.0"
-
-[[projects]]
-  name = "github.com/spf13/pflag"
-  packages = ["."]
-  revision = "9a97c102cda95a86cec2345a6f09f55a939babf5"
-  version = "v1.0.2"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "f6087c0b85729f6281d53f35c3d177780a29d49c74ea6dfde0a7ad376af7e256"
-  solver-name = "gps-cdcl"
-  solver-version = 1

Gopkg.toml

-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#   name = "github.com/x/y"
-#   version = "2.4.0"
-#
-# [prune]
-#   non-go = false
-#   go-tests = true
-#   unused-packages = true
-
-
-[[constraint]]
-  name = "github.com/pkg/errors"
-  version = "0.8.0"
-
-[[constraint]]
-  name = "github.com/spf13/pflag"
-  version = "1.0.2"
-
-[prune]
-  go-tests = true
-  unused-packages = true
-
-[[constraint]]
-  name = "github.com/gorilla/mux"
-  version = "1.6.2"

build.sh

-#!/usr/bin/env bash
+#!/usr/bin/env sh
 ver=$(git describe)
 sha=$(git rev-parse HEAD)
 dt="$(date +%Y-%m-%d)T$(date +%H:%M:%S)Z"
 buildStr="v${ver} (${dt})"
 pkg=gitlab.ssec.wisc.edu/brucef/chart-server
-go install -v --ldflags "-X 'main.buildStr=${buildStr}'" ${pkg}/...
+go build -v --ldflags "-X 'main.buildStr=${buildStr}'" ${pkg}/...

entrypoint.sh

+#!/usr/bin/env sh
+[[ -z $CHART_SVR_URL ]] && echo "CHART_SVR_URL is required" && exit 2
+exec dumb-init -- /chart-server --dir=/charts

go.mod

+module gitlab.ssec.wisc.edu/brucef/chart-server
+
+go 1.12
+
+require (
+	github.com/gorilla/context v1.1.1
+	github.com/gorilla/handlers v1.4.0
+	github.com/gorilla/mux v1.6.2
+	github.com/pkg/errors v0.8.0
+	github.com/spf13/pflag v1.0.2
+)

go.sum

+github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
+github.com/gorilla/handlers v1.4.0 h1:XulKRWSQK5uChr4pEgSE4Tc/OcmnU9GJuSwdog/tZsA=
+github.com/gorilla/handlers v1.4.0/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
+github.com/gorilla/mux v1.6.2 h1:Pgr17XVTNXAk3q/r4CpKzC5xBM/qW1uVLV+IhRZpIIk=
+github.com/gorilla/mux v1.6.2/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/pkg/errors v0.8.0 h1:WdK/asTD0HN+q6hsWO3/vpuAkAr+tw6aNJNDFFf0+qw=
+github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/spf13/pflag v1.0.2 h1:Fy0orTDgHdbnzHcsOgfCN4LtHf0ec3wwtiwJqwvf3Gc=
+github.com/spf13/pflag v1.0.2/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=