build: target for go library dependencies

Didn't notice it because vendor/ was already populated on my dev
machine, but did notice it in Docker build.

Docker build now consumes devsetup like regular user, so this should
catch future problems.

Remove remaining curl|shit functionality from lazy.sh (no checkout logic
needed anymore).

refs #35

lazy.sh

@@ -13,7 +13,7 @@ step() {
     echo "${bold}$1${normal}"
 }
 
-if ! type go; then
+if ! type go >/dev/null; then
     step "go binary not installed or not in \$PATH" 1>&2
     exit 1
 fi
@@ -25,23 +25,6 @@ fi
 
 CHECKOUTPATH="${GOPATH}/src/github.com/zrepl/zrepl"
 
-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 "$CHECKOUTPATH"
-        fi
-    else
-        mkdir -p "$GOPATH/src/github.com/zrepl"
-        cd "$GOPATH/src/github.com/zrepl"
-        git clone https://github.com/zrepl/zrepl.git
-        cd zrepl
-    fi
-}
-
 builddep() {
     step "Install build depdencies using 'go get' to \$GOPATH/bin"
     go get -u golang.org/x/tools/cmd/stringer
@@ -75,16 +58,15 @@ release() {
     make release
 }
 
-# precheck
 for cmd in "$@"; do
     case "$cmd" in
-        clone|builddep|godep|docdep|release_bins|docs)
+        builddep|godep|docdep|release_bins|docs)
+            eval $cmd
             continue
             ;;
         devsetup)
             step "Installing development dependencies"
             builddep
-            godep
             docdep
             step "Development dependencies installed"
             continue
@@ -96,8 +78,3 @@ for cmd in "$@"; do
     esac
 done
 
-for cmd in "$@"; do
-    step "Step ${cmd}"
-    eval $cmd
-done
-