tools/server, docker: use downloaded version of artifact

Signed-off-by: deadprogram <[email protected]>

.gitignore

@@ -1,2 +1,3 @@
 build
 keys/*.pem
+tools/docker/versions/*.tar.gz

go.mod

@@ -4,6 +4,7 @@ go 1.15
 
 require (
 	github.com/bradleyfalzon/ghinstallation v1.1.1
+	github.com/cavaliercoder/grab v2.0.0+incompatible // indirect
 	github.com/google/go-github/v40 v40.0.0
 	github.com/mattermost/go-circleci v0.7.1
 	go.bug.st/serial v1.1.0

go.sum

@@ -1,5 +1,7 @@
 github.com/bradleyfalzon/ghinstallation v1.1.1 h1:pmBXkxgM1WeF8QYvDLT5kuQiHMcmf+X015GI0KM/E3I=
 github.com/bradleyfalzon/ghinstallation v1.1.1/go.mod h1:vyCmHTciHx/uuyN82Zc3rXN3X2KTK8nUTCrTMwAhcug=
+github.com/cavaliercoder/grab v2.0.0+incompatible h1:wZHbBQx56+Yxjx2TCGDcenhh3cJn7cCLMfkEPmySTSE=
+github.com/cavaliercoder/grab v2.0.0+incompatible/go.mod h1:tTBkfNqSBfuMmMBFaO2phgyhdYhiZQ/+iXCZDzcDsMI=
 github.com/creack/goselect v0.1.1 h1:tiSSgKE1eJtxs1h/VgGQWuXUP0YS4CDIFMp6vaI1ls0=
 github.com/creack/goselect v0.1.1/go.mod h1:a/NhLweNvqIYMuxcMOuWY516Cimucms3DglDzQP3hKY=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=

tools/docker/Dockerfile

@@ -17,12 +17,12 @@ RUN wget https://dl.google.com/go/go${GO_RELEASE}.linux-amd64.tar.gz && \
 ENV PATH=${PATH}:/usr/local/go/bin
 
 FROM tinygohci-base AS tinygohci-build
-ENV TINYGO_RELEASE=0.19.0
-ARG TINYGO_DOWNLOAD_URL=https://github.com/tinygo-org/tinygo/releases/download/v${TINYGO_RELEASE}/tinygo${TINYGO_RELEASE}.linux-amd64.tar.gz
-RUN wget ${TINYGO_DOWNLOAD_URL} -O tinygo.zip && \
-    unzip tinygo.zip tinygo.linux-amd64.tar.gz && \
-    tar -xzf tinygo.linux-amd64.tar.gz -C /usr/local && \
-    rm tinygo.zip tinygo.linux-amd64.tar.gz
+ENV TINYGO_RELEASE=0.21.0
+ARG TINYGO_DOWNLOAD_SHA=1234
+
+COPY versions/${TINYGO_DOWNLOAD_SHA}.tar.gz tinygo.linux-amd64.tar.gz
+RUN tar -xzf tinygo.linux-amd64.tar.gz -C /usr/local && \
+    rm tinygo.linux-amd64.tar.gz
 ENV PATH=${PATH}:/usr/local/tinygo/bin
 RUN go get -d tinygo.org/x/drivers
 

tools/docker/versions/README.md

@@ -0,0 +1 @@
+This directory is to hold downloaded version of the TinyGo executable.

tools/server/main.go

@@ -10,6 +10,7 @@ import (
 
 	"net/http"
 
+	"github.com/cavaliercoder/grab"
 	"github.com/google/go-github/v40/github"
 )
 
@@ -207,7 +208,14 @@ func processBuilds(builds chan *Build) {
 			}
 
 			log.Printf("Building docker image using TinyGo from %s\n", url)
-			err := buildDocker(url, build.sha)
+			err := downloadBinary(url, build.sha)
+			if err != nil {
+				log.Println(err)
+				build.failCheckSuite("binary download failed")
+				continue
+			}
+
+			err = buildDocker(build.sha)
 			if err != nil {
 				log.Println(err)
 				build.failCheckSuite("docker build failed")
@@ -233,8 +241,8 @@ func processBuilds(builds chan *Build) {
 
 // buildDocker does the docker build for the binary download
 // with this SHA.
-func buildDocker(url, sha string) error {
-	buildarg := fmt.Sprintf("TINYGO_DOWNLOAD_URL=%s", url)
+func buildDocker(sha string) error {
+	buildarg := fmt.Sprintf("TINYGO_DOWNLOAD_SHA=%s", sha)
 	buildtag := "tinygohci:" + sha[:7]
 	out, err := exec.Command("docker", "build",
 		"-t", buildtag,
@@ -249,6 +257,49 @@ func buildDocker(url, sha string) error {
 	return nil
 }
 
+// downloadBinary does the download for the binary build
+// with this SHA.
+func downloadBinary(url, sha string) error {
+	// check if the file is already downloaded for this sha
+	if !fileExists("tools/docker/versions/" + sha + ".tar.gz") {
+		log.Println("Downloading binary for", sha)
+
+		_, err := grab.Get("tinygo-latest.zip", url)
+		if err != nil {
+			return err
+		}
+
+		// unzip
+		_, err = exec.Command("unzip", "tinygo-latest.zip",
+			"tinygo.linux-amd64.tar.gz").CombinedOutput()
+		if err != nil {
+			return err
+		}
+
+		// move file
+		err = os.Rename("tinygo.linux-amd64.tar.gz", "tools/docker/versions/"+sha+".tar.gz")
+		if err != nil {
+			return err
+		}
+
+		err = os.Remove("tinygo-latest.zip")
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// fileExists checks if a file exists and is not a directory before we
+// try using it to prevent further errors.
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}
+
 func performCheckRun(cr *github.CheckRun, runID int64, buildsCh chan *Build) {
 	// do the retest here
 	url, err := getTinygoBinaryURLFromGH(runID)