Add Docker build image, modularize lazy.sh and adjust build from source instructions

refs #35

lazy.sh

@@ -1,7 +1,7 @@
-#!/bin/sh
+#!/bin/bash
 set -e
 
-if [ ! -z "$TERM" ]; then
+if tty -s; then
     bold=$(tput bold)
     normal=$(tput sgr0)
 else
@@ -13,39 +13,91 @@ step() {
     echo "${bold}$1${normal}"
 }
 
+if ! type go; then
+    step "go binary not installed or not in \$PATH" 1>&2
+    exit 1
+fi
+
 if [ -z "$GOPATH" ]; then
     step "Make sure you have your GOPATH configured correctly" 1>&2
     exit 1
 fi
 
-step "Checkout sources to \$GOPATH/github.com/zrepl/zrepl"
 CHECKOUTPATH="${GOPATH}/src/github.com/zrepl/zrepl"
-if [ -e "$CHECKOUTPATH" ]; then
-    echo "${CHECKOUTPATH} already exists"
-    if [ ! -d "$CHECKOUTPATH" ]; then
-        echo "${CHECKOUTPATH} is not a directory, aborting" 1>&2
+
+clone() {
+    step "Checkout sources to \$GOPATH/github.com/zrepl/zrepl"
+    if [ -e "$CHECKOUTPATH" ]; then
+        echo "${CHECKOUTPATH} already exists"
+        if [ ! -d "$CHECKOUTPATH" ]; then
+            echo "${CHECKOUTPATH} is not a directory, aborting" 1>&2
+        else
+            cd "$CHECKOUTPATH"
+        fi
     else
-        cd "$CHECKOUTPATH"
+        mkdir -p "$GOPATH/src/github.com/zrepl"
+        cd "$GOPATH/src/github.com/zrepl"
+        git clone https://github.com/zrepl/zrepl.git
+        cd zrepl
     fi
-else
-    mkdir -p "$GOPATH/src/github.com/zrepl"
-    cd "$GOPATH/src/github.com/zrepl"
-    git clone https://github.com/zrepl/zrepl.git
-    cd zrepl
-fi
+}
 
-step "Install build depdencies using 'go get' to \$GOPATH/bin"
-go get -u golang.org/x/tools/cmd/stringer
-go get -u github.com/golang/dep/cmd/dep
-if ! type stringer || ! type dep; then
-    echo "Installed dependencies but can't find them in \$PATH, adjust it to contain \$GOPATH/bin" 1>&2
-    exit 1
-fi
+builddep() {
+    step "Install build depdencies using 'go get' to \$GOPATH/bin"
+    go get -u golang.org/x/tools/cmd/stringer
+    go get -u github.com/golang/dep/cmd/dep
+    if ! type stringer || ! type dep; then
+        echo "Installed dependencies but can't find them in \$PATH, adjust it to contain \$GOPATH/bin" 1>&2
+        exit 1
+    fi
+}
 
-step "Fetching dependencies using 'dep ensure'"
-dep ensure
+godep() {
+    step "Fetching dependencies using 'dep ensure'"
+    dep ensure
+}
 
-step "Making release"
-make release-bins
+docdep() {
+    if ! type pip3; then
+        step "pip3 binary not installed or not in \$PATH" 1>&2
+        exit 1
+    fi
+    step "Installing doc build dependencies"
+    local reqpath="${CHECKOUTPATH}/docs/requirements.txt"
+    if [ ! -z "$ZREPL_LAZY_DOCS_REQPATH" ]; then
+        reqpath="$ZREPL_LAZY_DOCS_REQPATH"
+    fi
+    pip3 install -r "$reqpath"
+}
+
+release() {
+    step "Making release"
+    make release
+}
+
+# precheck
+for cmd in "$@"; do
+    case "$cmd" in
+        clone|builddep|godep|docdep|release_bins|docs)
+            continue
+            ;;
+        devsetup)
+            step "Installing development dependencies"
+            builddep
+            godep
+            docdep
+            step "Development dependencies installed"
+            continue
+            ;;
+        *)
+            step "Invalid command ${cmd}, exiting"
+            exit 1
+            ;;
+    esac
+done
+
+for cmd in "$@"; do
+    step "Step ${cmd}"
+    eval $cmd
+done
 
-step "Release artifacts are available in $(pwd)/artifacts"