v3.3.0

Closes #327

CHANGELOG.md

@@ -1,13 +1,35 @@
 # Changelog
 
-## v3.2.1
+## v3.3.0 - 2021-03-20
+
+- Add support for delegating CLI arguments to commands with `--` and a
+  special `CLI_ARGS` variable
+  ([#327](https://github.com/go-task/task/issues/327)).
+- Add a `--concurrency` (alias `-C`) flag, to limit the number of tasks that
+  run concurrently. This is useful for heavy workloads.
+  ([#345](https://github.com/go-task/task/pull/345)).
+
+## v3.2.2 - 2021-01-12
+
+- Improve performance of `--list` and `--summary` by skipping running shell
+  variables for these flags
+  ([#332](https://github.com/go-task/task/issues/332)).
+- Fixed a bug where an environment in a Taskfile was not always overridable
+  by the system environment
+  ([#425](https://github.com/go-task/task/issues/425)).
+- Fixed environment from .env files not being available as variables
+  ([#379](https://github.com/go-task/task/issues/379)).
+- The install script is now working for ARM platforms
+  ([#428](https://github.com/go-task/task/pull/428)).
+
+## v3.2.1 - 2021-01-09
 
 - Fixed some bugs and regressions regarding dynamic variables and directories
   ([#426](https://github.com/go-task/task/issues/426)).
 - The [slim-sprig](https://github.com/go-task/slim-sprig) package was updated
   with the upstream [sprig](https://github.com/Masterminds/sprig).
 
-## v3.2.0
+## v3.2.0 - 2021-01-07
 
 - Fix the `.task` directory being created in the task directory instead of the
   Taskfile directory
@@ -20,7 +42,7 @@
   should be more stable now
   ([#423](https://github.com/go-task/task/pull/423), [#365](https://github.com/go-task/task/issues/365)).
 
-## v3.1.0
+## v3.1.0 - 2021-01-03
 
 - Fix a bug when the checksum up-to-date resolution is used by a task
   with a custom `label:` attribute
@@ -36,7 +58,7 @@
   sentence was in the last line
   ([#403](https://github.com/go-task/task/issues/403)).
 
-## v3.0.1
+## v3.0.1 - 2020-12-26
 
 - Allow use as a library by moving the required packages out of the `internal`
   directory
@@ -46,7 +68,7 @@
 - Fix panic when you have empty tasks in your Taskfile
   ([#338](https://github.com/go-task/task/issues/338), [#362](https://github.com/go-task/task/pull/362)).
 
-## v3.0.0
+## v3.0.0 - 2020-08-16
 
 - On `v3`, all CLI variables will be considered global variables
   ([#336](https://github.com/go-task/task/issues/336), [#341](https://github.com/go-task/task/pull/341))
@@ -89,7 +111,7 @@
   commands are green, errors are red, etc
   ([#207](https://github.com/go-task/task/pull/207)).
 
-## v2.8.1 - 2019-05-20
+## v2.8.1 - 2020-05-20
 
 - Fix error code for the `--help` flag
   ([#300](https://github.com/go-task/task/issues/300), [#330](https://github.com/go-task/task/pull/330)).

Taskfile.yml

@@ -12,6 +12,9 @@ vars:
   GO_PACKAGES:
     sh: go list ./...
 
+env:
+  CGO_ENABLED: '0'
+
 tasks:
   default:
     cmds:
@@ -21,8 +24,6 @@ tasks:
     desc: Installs Task
     cmds:
       - go install -v -ldflags="-w -s -X main.version={{.GIT_COMMIT}}" ./cmd/task
-    env:
-      CGO_ENABLED: '0'
 
   mod:
     desc: Downloads and tidy Go modules

args/args.go

@@ -9,7 +9,7 @@ import (
 // ParseV3 parses command line argument: tasks and global variables
 func ParseV3(args ...string) ([]taskfile.Call, *taskfile.Vars) {
 	var calls []taskfile.Call
-	var globals *taskfile.Vars
+	var globals = &taskfile.Vars{}
 
 	for _, arg := range args {
 		if !strings.Contains(arg, "=") {
@@ -17,9 +17,6 @@ func ParseV3(args ...string) ([]taskfile.Call, *taskfile.Vars) {
 			continue
 		}
 
-		if globals == nil {
-			globals = &taskfile.Vars{}
-		}
 		name, value := splitVar(arg)
 		globals.Set(name, taskfile.Var{Static: value})
 	}
@@ -34,7 +31,7 @@ func ParseV3(args ...string) ([]taskfile.Call, *taskfile.Vars) {
 // ParseV2 parses command line argument: tasks and vars of each task
 func ParseV2(args ...string) ([]taskfile.Call, *taskfile.Vars) {
 	var calls []taskfile.Call
-	var globals *taskfile.Vars
+	var globals = &taskfile.Vars{}
 
 	for _, arg := range args {
 		if !strings.Contains(arg, "=") {
@@ -43,9 +40,6 @@ func ParseV2(args ...string) ([]taskfile.Call, *taskfile.Vars) {
 		}
 
 		if len(calls) < 1 {
-			if globals == nil {
-				globals = &taskfile.Vars{}
-			}
 			name, value := splitVar(arg)
 			globals.Set(name, taskfile.Var{Static: value})
 		} else {

args/args_test.go

@@ -96,7 +96,9 @@ func TestArgsV3(t *testing.T) {
 		t.Run(fmt.Sprintf("TestArgs%d", i+1), func(t *testing.T) {
 			calls, globals := args.ParseV3(test.Args...)
 			assert.Equal(t, test.ExpectedCalls, calls)
+			if test.ExpectedGlobals.Len() > 0 || globals.Len() > 0 {
 				assert.Equal(t, test.ExpectedGlobals, globals)
+			}
 		})
 	}
 }
@@ -198,7 +200,10 @@ func TestArgsV2(t *testing.T) {
 		t.Run(fmt.Sprintf("TestArgs%d", i+1), func(t *testing.T) {
 			calls, globals := args.ParseV2(test.Args...)
 			assert.Equal(t, test.ExpectedCalls, calls)
+			if test.ExpectedGlobals.Len() > 0 || globals.Len() > 0 {
 				assert.Equal(t, test.ExpectedGlobals, globals)
+			}
+
 		})
 	}
 }

cmd/task/task.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"os/signal"
 	"path/filepath"
+	"strings"
 	"syscall"
 
 	"github.com/spf13/pflag"
@@ -65,6 +66,7 @@ func main() {
 		dry         bool
 		summary     bool
 		parallel    bool
+		concurrency int
 		dir         string
 		entrypoint  string
 		output      string
@@ -87,6 +89,7 @@ func main() {
 	pflag.StringVarP(&entrypoint, "taskfile", "t", "", `choose which Taskfile to run. Defaults to "Taskfile.yml"`)
 	pflag.StringVarP(&output, "output", "o", "", "sets output style: [interleaved|group|prefixed]")
 	pflag.BoolVarP(&color, "color", "c", true, "colored output")
+	pflag.IntVarP(&concurrency, "concurrency", "C", 0, "limit number tasks to run concurrently")
 	pflag.Parse()
 
 	if versionFlag {
@@ -132,6 +135,7 @@ func main() {
 		Summary:     summary,
 		Parallel:    parallel,
 		Color:       color,
+		Concurrency: concurrency,
 
 		Stdin:  os.Stdin,
 		Stdout: os.Stdout,
@@ -156,12 +160,16 @@ func main() {
 	var (
 		calls                 []taskfile.Call
 		globals               *taskfile.Vars
+		tasksAndVars, cliArgs = getArgs()
 	)
+
 	if v >= 3.0 {
-		calls, globals = args.ParseV3(pflag.Args()...)
+		calls, globals = args.ParseV3(tasksAndVars...)
 	} else {
-		calls, globals = args.ParseV2(pflag.Args()...)
+		calls, globals = args.ParseV2(tasksAndVars...)
 	}
+
+	globals.Set("CLI_ARGS", taskfile.Var{Static: strings.Join(cliArgs, " ")})
 	e.Taskfile.Vars.Merge(globals)
 
 	ctx := context.Background()
@@ -182,6 +190,22 @@ func main() {
 	}
 }
 
+func getArgs() (tasksAndVars, cliArgs []string) {
+	var (
+		args          = pflag.Args()
+		doubleDashPos = pflag.CommandLine.ArgsLenAtDash()
+	)
+
+	if doubleDashPos != -1 {
+		tasksAndVars = args[:doubleDashPos]
+		cliArgs = args[doubleDashPos:]
+	} else {
+		tasksAndVars = args
+	}
+
+	return
+}
+
 func getSignalContext() context.Context {
 	ch := make(chan os.Signal, 1)
 	signal.Notify(ch, os.Interrupt, os.Kill, syscall.SIGTERM)

concurrency.go

@@ -0,0 +1,25 @@
+package task
+
+func (e *Executor) acquireConcurrencyLimit() func() {
+	if e.concurrencySemaphore == nil {
+		return emptyFunc
+	}
+
+	e.concurrencySemaphore <- struct{}{}
+	return func() {
+		<-e.concurrencySemaphore
+	}
+}
+
+func (e *Executor) releaseConcurrencyLimit() func() {
+	if e.concurrencySemaphore == nil {
+		return emptyFunc
+	}
+
+	<-e.concurrencySemaphore
+	return func() {
+		e.concurrencySemaphore <- struct{}{}
+	}
+}
+
+func emptyFunc() {}

docs/install.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -e
-# Code generated by godownloader on 2018-04-07T17:47:38Z. DO NOT EDIT.
+# Code generated by godownloader on 2021-01-12T13:40:40Z. DO NOT EDIT.
 #
 
 usage() {
@@ -27,11 +27,12 @@ parse_args() {
   # over-ridden by flag below
 
   BINDIR=${BINDIR:-./bin}
-  while getopts "b:dh?" arg; do
+  while getopts "b:dh?x" arg; do
     case "$arg" in
       b) BINDIR="$OPTARG" ;;
       d) log_set_priority 10 ;;
       h | \?) usage "$0" ;;
+      x) set -x ;;
     esac
   done
   shift $((OPTIND - 1))
@@ -42,46 +43,41 @@ parse_args() {
 # network, either nothing will happen or will syntax error
 # out preventing half-done work
 execute() {
-  tmpdir=$(mktmpdir)
+  tmpdir=$(mktemp -d)
   log_debug "downloading files into ${tmpdir}"
   http_download "${tmpdir}/${TARBALL}" "${TARBALL_URL}"
   http_download "${tmpdir}/${CHECKSUM}" "${CHECKSUM_URL}"
   hash_sha256_verify "${tmpdir}/${TARBALL}" "${tmpdir}/${CHECKSUM}"
   srcdir="${tmpdir}"
   (cd "${tmpdir}" && untar "${TARBALL}")
-  install -d "${BINDIR}"
+  test ! -d "${BINDIR}" && install -d "${BINDIR}"
-  for binexe in "task" ; do
+  for binexe in $BINARIES; do
     if [ "$OS" = "windows" ]; then
       binexe="${binexe}.exe"
     fi
     install "${srcdir}/${binexe}" "${BINDIR}/"
     log_info "installed ${BINDIR}/${binexe}"
   done
+  rm -rf "${tmpdir}"
 }
-is_supported_platform() {
+get_binaries() {
-  platform=$1
+  case "$PLATFORM" in
-  found=1
+    darwin/amd64) BINARIES="task" ;;
-  case "$platform" in
+    darwin/arm64) BINARIES="task" ;;
-    windows/386) found=0 ;;
+    darwin/armv6) BINARIES="task" ;;
-    windows/amd64) found=0 ;;
+    linux/386) BINARIES="task" ;;
-    darwin/386) found=0 ;;
+    linux/amd64) BINARIES="task" ;;
-    darwin/amd64) found=0 ;;
+    linux/arm64) BINARIES="task" ;;
-    linux/386) found=0 ;;
+    linux/armv6) BINARIES="task" ;;
-    linux/amd64) found=0 ;;
+    windows/386) BINARIES="task" ;;
-  esac
+    windows/amd64) BINARIES="task" ;;
-  case "$platform" in
+    windows/arm64) BINARIES="task" ;;
-    darwin/386) found=1 ;;
+    windows/armv6) BINARIES="task" ;;
-  esac
+    *)
-  return $found
-}
-check_platform() {
-  if is_supported_platform "$PLATFORM"; then
-    # optional logging goes here
-    true
-  else
       log_crit "platform $PLATFORM is not supported.  Make sure this script is up-to-date and file request at https://github.com/${PREFIX}/issues/new"
       exit 1
-  fi
+      ;;
+  esac
 }
 tag_to_version() {
   if [ -z "${TAG}" ]; then
@@ -99,8 +95,8 @@ tag_to_version() {
   VERSION=${TAG#v}
 }
 adjust_format() {
-  # change format (tar.gz or zip) based on ARCH
+  # change format (tar.gz or zip) based on OS
-  case ${ARCH} in
+  case ${OS} in
     windows) FORMAT=zip ;;
   esac
   true
@@ -174,7 +170,9 @@ log_crit() {
 uname_os() {
   os=$(uname -s | tr '[:upper:]' '[:lower:]')
   case "$os" in
-    msys_nt) os="windows" ;;
+    cygwin_nt*) os="windows" ;;
+    mingw*) os="windows" ;;
+    msys_nt*) os="windows" ;;
   esac
   echo "$os"
 }
@@ -186,9 +184,9 @@ uname_arch() {
     i686) arch="386" ;;
     i386) arch="386" ;;
     aarch64) arch="arm64" ;;
-    armv5*) arch="arm5" ;;
+    armv5*) arch="armv5" ;;
-    armv6*) arch="arm6" ;;
+    armv6*) arch="armv6" ;;
-    armv7*) arch="arm7" ;;
+    armv7*) arch="armv7" ;;
   esac
   echo ${arch}
 }
@@ -234,8 +232,8 @@ uname_arch_check() {
 untar() {
   tarball=$1
   case "${tarball}" in
-    *.tar.gz | *.tgz) tar -xzf "${tarball}" ;;
+    *.tar.gz | *.tgz) tar --no-same-owner -xzf "${tarball}" ;;
-    *.tar) tar -xf "${tarball}" ;;
+    *.tar) tar --no-same-owner -xf "${tarball}" ;;
     *.zip) unzip "${tarball}" ;;
     *)
       log_err "untar unknown archive format for ${tarball}"
@@ -243,11 +241,6 @@ untar() {
       ;;
   esac
 }
-mktmpdir() {
-  test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
-  mkdir -p "${TMPDIR}"
-  echo "${TMPDIR}"
-}
 http_download_curl() {
   local_file=$1
   source_url=$2
@@ -368,7 +361,7 @@ uname_arch_check "$ARCH"
 
 parse_args "$@"
 
-check_platform
+get_binaries
 
 tag_to_version
 

docs/usage.md

@@ -520,6 +520,27 @@ tasks:
 
 This works for all types of variables.
 
+## Forwarding CLI arguments to commands
+
+If `--` is given in the CLI, all following paramaters are added to a
+special `.CLI_ARGS` variable. This is useful to forward arguments to another
+command.
+
+The below example will run `yarn install`.
+
+```bash
+$ task yarn -- install
+```
+
+```yaml
+version: '3'
+
+tasks:
+  yarn:
+    cmds:
+      - yarn {{.CLI_ARGS}}
+```
+
 ## Go's template engine
 
 Task parse commands as [Go's template engine][gotemplate] before executing

go.mod

@@ -7,11 +7,11 @@ require (
 	github.com/mattn/go-colorable v0.1.2 // indirect
 	github.com/mattn/go-zglob v0.0.1
 	github.com/radovskyb/watcher v1.0.5
-	github.com/spf13/pflag v1.0.3
+	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.5.1
 	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
 	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c
-	mvdan.cc/sh/v3 v3.2.1
+	mvdan.cc/sh/v3 v3.2.4
 )
 
 go 1.13

go.sum

@@ -13,7 +13,6 @@ github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg78
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
 github.com/joho/godotenv v1.3.0 h1:Zjp+RcGpHhGlrMbJzXTrZZPrWj+1vfm90La1wgB6Bhc=
 github.com/joho/godotenv v1.3.0/go.mod h1:7hK45KPybAkOC6peb+G5yklZfMxEjkZhHbwpqxOKXbg=
-github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
 github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
@@ -33,10 +32,9 @@ github.com/radovskyb/watcher v1.0.5 h1:wqt7gb+HjGacvFoLTKeT44C+XVPxu7bvHvKT1IvZ7
 github.com/radovskyb/watcher v1.0.5/go.mod h1:78okwvY5wPdzcb1UYnip1pvrZNIVEIh/Cm+ZuvsUYIg=
 github.com/rogpeppe/go-internal v1.6.2/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
-github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
+github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
-github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
+github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
@@ -48,7 +46,6 @@ golang.org/x/sys v0.0.0-20201029080932-201ba4db2418 h1:HlFl4V6pEMziuLXyRkm5BIYq1
 golang.org/x/sys v0.0.0-20201029080932-201ba4db2418/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407 h1:5zh5atpUEdIc478E/ebrIaHLKcfVvG6dL/fGv7BcMoM=
 golang.org/x/term v0.0.0-20191110171634-ad39bd3f0407/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -58,5 +55,5 @@ gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 mvdan.cc/editorconfig v0.1.1-0.20200121172147-e40951bde157/go.mod h1:Ge4atmRUYqueGppvJ7JNrtqpqokoJEFxYbP0Z+WeKS8=
-mvdan.cc/sh/v3 v3.2.1 h1:uQBpiGM+rEuHse3Q+W7ajuJUeOtFVJUN/6GeX4/dUWE=
+mvdan.cc/sh/v3 v3.2.4 h1:+fZaWcXWRjYAvqzEKoDhDM3DkxdDUykU2iw0VMKFe9s=
-mvdan.cc/sh/v3 v3.2.1/go.mod h1:fPQmabBpREM/XQ9YXSU5ZFZ/Sm+PmKP9/vkFHgYKJEI=
+mvdan.cc/sh/v3 v3.2.4/go.mod h1:fPQmabBpREM/XQ9YXSU5ZFZ/Sm+PmKP9/vkFHgYKJEI=

help.go

@@ -30,7 +30,7 @@ func (e *Executor) tasksWithDesc() (tasks []*taskfile.Task) {
 	tasks = make([]*taskfile.Task, 0, len(e.Taskfile.Tasks))
 	for _, task := range e.Taskfile.Tasks {
 		if task.Desc != "" {
-			compiledTask, err := e.CompiledTask(taskfile.Call{Task: task.Task})
+			compiledTask, err := e.FastCompiledTask(taskfile.Call{Task: task.Task})
 			if err == nil {
 				task = compiledTask
 			}

install-task.sh

@@ -1,6 +1,6 @@
 #!/bin/sh
 set -e
-# Code generated by godownloader on 2018-04-07T17:47:38Z. DO NOT EDIT.
+# Code generated by godownloader on 2021-01-12T13:40:40Z. DO NOT EDIT.
 #
 
 usage() {
@@ -27,11 +27,12 @@ parse_args() {
   # over-ridden by flag below
 
   BINDIR=${BINDIR:-./bin}
-  while getopts "b:dh?" arg; do
+  while getopts "b:dh?x" arg; do
     case "$arg" in
       b) BINDIR="$OPTARG" ;;
       d) log_set_priority 10 ;;
       h | \?) usage "$0" ;;
+      x) set -x ;;
     esac
   done
   shift $((OPTIND - 1))
@@ -42,46 +43,41 @@ parse_args() {
 # network, either nothing will happen or will syntax error
 # out preventing half-done work
 execute() {
-  tmpdir=$(mktmpdir)
+  tmpdir=$(mktemp -d)
   log_debug "downloading files into ${tmpdir}"
   http_download "${tmpdir}/${TARBALL}" "${TARBALL_URL}"
   http_download "${tmpdir}/${CHECKSUM}" "${CHECKSUM_URL}"
   hash_sha256_verify "${tmpdir}/${TARBALL}" "${tmpdir}/${CHECKSUM}"
   srcdir="${tmpdir}"
   (cd "${tmpdir}" && untar "${TARBALL}")
-  install -d "${BINDIR}"
+  test ! -d "${BINDIR}" && install -d "${BINDIR}"
-  for binexe in "task" ; do
+  for binexe in $BINARIES; do
     if [ "$OS" = "windows" ]; then
       binexe="${binexe}.exe"
     fi
     install "${srcdir}/${binexe}" "${BINDIR}/"
     log_info "installed ${BINDIR}/${binexe}"
   done
+  rm -rf "${tmpdir}"
 }
-is_supported_platform() {
+get_binaries() {
-  platform=$1
+  case "$PLATFORM" in
-  found=1
+    darwin/amd64) BINARIES="task" ;;
-  case "$platform" in
+    darwin/arm64) BINARIES="task" ;;
-    windows/386) found=0 ;;
+    darwin/armv6) BINARIES="task" ;;
-    windows/amd64) found=0 ;;
+    linux/386) BINARIES="task" ;;
-    darwin/386) found=0 ;;
+    linux/amd64) BINARIES="task" ;;
-    darwin/amd64) found=0 ;;
+    linux/arm64) BINARIES="task" ;;
-    linux/386) found=0 ;;
+    linux/armv6) BINARIES="task" ;;
-    linux/amd64) found=0 ;;
+    windows/386) BINARIES="task" ;;
-  esac
+    windows/amd64) BINARIES="task" ;;
-  case "$platform" in
+    windows/arm64) BINARIES="task" ;;
-    darwin/386) found=1 ;;
+    windows/armv6) BINARIES="task" ;;
-  esac
+    *)
-  return $found
-}
-check_platform() {
-  if is_supported_platform "$PLATFORM"; then
-    # optional logging goes here
-    true
-  else
       log_crit "platform $PLATFORM is not supported.  Make sure this script is up-to-date and file request at https://github.com/${PREFIX}/issues/new"
       exit 1
-  fi
+      ;;
+  esac
 }
 tag_to_version() {
   if [ -z "${TAG}" ]; then
@@ -99,8 +95,8 @@ tag_to_version() {
   VERSION=${TAG#v}
 }
 adjust_format() {
-  # change format (tar.gz or zip) based on ARCH
+  # change format (tar.gz or zip) based on OS
-  case ${ARCH} in
+  case ${OS} in
     windows) FORMAT=zip ;;
   esac
   true
@@ -174,7 +170,9 @@ log_crit() {
 uname_os() {
   os=$(uname -s | tr '[:upper:]' '[:lower:]')
   case "$os" in
-    msys_nt) os="windows" ;;
+    cygwin_nt*) os="windows" ;;
+    mingw*) os="windows" ;;
+    msys_nt*) os="windows" ;;
   esac
   echo "$os"
 }
@@ -186,9 +184,9 @@ uname_arch() {
     i686) arch="386" ;;
     i386) arch="386" ;;
     aarch64) arch="arm64" ;;
-    armv5*) arch="arm5" ;;
+    armv5*) arch="armv5" ;;
-    armv6*) arch="arm6" ;;
+    armv6*) arch="armv6" ;;
-    armv7*) arch="arm7" ;;
+    armv7*) arch="armv7" ;;
   esac
   echo ${arch}
 }
@@ -234,8 +232,8 @@ uname_arch_check() {
 untar() {
   tarball=$1
   case "${tarball}" in
-    *.tar.gz | *.tgz) tar -xzf "${tarball}" ;;
+    *.tar.gz | *.tgz) tar --no-same-owner -xzf "${tarball}" ;;
-    *.tar) tar -xf "${tarball}" ;;
+    *.tar) tar --no-same-owner -xf "${tarball}" ;;
     *.zip) unzip "${tarball}" ;;
     *)
       log_err "untar unknown archive format for ${tarball}"
@@ -243,11 +241,6 @@ untar() {
       ;;
   esac
 }
-mktmpdir() {
-  test -z "$TMPDIR" && TMPDIR="$(mktemp -d)"
-  mkdir -p "${TMPDIR}"
-  echo "${TMPDIR}"
-}
 http_download_curl() {
   local_file=$1
   source_url=$2
@@ -368,7 +361,7 @@ uname_arch_check "$ARCH"
 
 parse_args "$@"
 
-check_platform
+get_binaries
 
 tag_to_version
 

internal/compiler/compiler.go

@@ -8,6 +8,7 @@ import (
 // E.g. variable merger, template processing, etc.
 type Compiler interface {
 	GetVariables(t *taskfile.Task, call taskfile.Call) (*taskfile.Vars, error)
+	FastGetVariables(t *taskfile.Task, call taskfile.Call) (*taskfile.Vars, error)
 	HandleDynamicVar(v taskfile.Var, dir string) (string, error)
 	ResetCache()
 }

internal/compiler/v2/compiler_v2.go

@@ -30,6 +30,11 @@ type CompilerV2 struct {
 	muDynamicCache sync.Mutex
 }
 
+// FastGetVariables is a no-op on v2
+func (c *CompilerV2) FastGetVariables(t *taskfile.Task, call taskfile.Call) (*taskfile.Vars, error) {
+	return c.GetVariables(t, call)
+}
+
 // GetVariables returns fully resolved variables following the priority order:
 // 1. Task variables
 // 2. Call variables

internal/compiler/v3/compiler_v3.go

@@ -20,6 +20,7 @@ var _ compiler.Compiler = &CompilerV3{}
 type CompilerV3 struct {
 	Dir string
 
+	TaskfileEnv  *taskfile.Vars
 	TaskfileVars *taskfile.Vars
 
 	Logger *logger.Logger
@@ -29,6 +30,14 @@ type CompilerV3 struct {
 }
 
 func (c *CompilerV3) GetVariables(t *taskfile.Task, call taskfile.Call) (*taskfile.Vars, error) {
+	return c.getVariables(t, call, true)
+}
+
+func (c *CompilerV3) FastGetVariables(t *taskfile.Task, call taskfile.Call) (*taskfile.Vars, error) {
+	return c.getVariables(t, call, false)
+}
+
+func (c *CompilerV3) getVariables(t *taskfile.Task, call taskfile.Call, evaluateShVars bool) (*taskfile.Vars, error) {
 	result := compiler.GetEnviron()
 	result.Set("TASK", taskfile.Var{Static: t.Task})
 
@@ -36,6 +45,11 @@ func (c *CompilerV3) GetVariables(t *taskfile.Task, call taskfile.Call) (*taskfi
 		return func(k string, v taskfile.Var) error {
 			tr := templater.Templater{Vars: result, RemoveNoValue: true}
 
+			if !evaluateShVars {
+				result.Set(k, taskfile.Var{Static: tr.Replace(v.Static)})
+				return nil
+			}
+
 			v = taskfile.Var{
 				Static: tr.Replace(v.Static),
 				Sh:     tr.Replace(v.Sh),
@@ -54,6 +68,9 @@ func (c *CompilerV3) GetVariables(t *taskfile.Task, call taskfile.Call) (*taskfi
 	}
 	rangeFunc := getRangeFunc(c.Dir)
 
+	if err := c.TaskfileEnv.Range(rangeFunc); err != nil {
+		return nil, err
+	}
 	if err := c.TaskfileVars.Range(rangeFunc); err != nil {
 		return nil, err
 	}

internal/templater/templater.go

@@ -63,7 +63,7 @@ func (r *Templater) ReplaceSlice(strs []string) []string {
 }
 
 func (r *Templater) ReplaceVars(vars *taskfile.Vars) *taskfile.Vars {
-	if r.err != nil || vars == nil || len(vars.Keys) == 0 {
+	if r.err != nil || vars.Len() == 0 {
 		return nil
 	}
 

task.go

@@ -42,6 +42,7 @@ type Executor struct {
 	Summary     bool
 	Parallel    bool
 	Color       bool
+	Concurrency int
 
 	Stdin  io.Reader
 	Stdout io.Writer
@@ -54,6 +55,7 @@ type Executor struct {
 
 	taskvars *taskfile.Vars
 
+	concurrencySemaphore chan struct{}
 	taskCallCount        map[string]*int32
 	mkdirMutexMap        map[string]*sync.Mutex
 }
@@ -71,7 +73,7 @@ func (e *Executor) Run(ctx context.Context, calls ...taskfile.Call) error {
 
 	if e.Summary {
 		for i, c := range calls {
-			compiledTask, err := e.CompiledTask(c)
+			compiledTask, err := e.FastCompiledTask(c)
 			if err != nil {
 				return nil
 			}
@@ -168,6 +170,7 @@ func (e *Executor) Setup() error {
 	} else {
 		e.Compiler = &compilerv3.CompilerV3{
 			Dir:          e.Dir,
+			TaskfileEnv:  e.Taskfile.Env,
 			TaskfileVars: e.Taskfile.Vars,
 			Logger:       e.Logger,
 		}
@@ -246,6 +249,10 @@ func (e *Executor) Setup() error {
 		e.taskCallCount[k] = new(int32)
 		e.mkdirMutexMap[k] = &sync.Mutex{}
 	}
+
+	if e.Concurrency > 0 {
+		e.concurrencySemaphore = make(chan struct{}, e.Concurrency)
+	}
 	return nil
 }
 
@@ -259,6 +266,9 @@ func (e *Executor) RunTask(ctx context.Context, call taskfile.Call) error {
 		return &MaximumTaskCallExceededError{task: call.Task}
 	}
 
+	release := e.acquireConcurrencyLimit()
+	defer release()
+
 	if err := e.runDeps(ctx, t); err != nil {
 		return err
 	}
@@ -323,6 +333,9 @@ func (e *Executor) mkdir(t *taskfile.Task) error {
 func (e *Executor) runDeps(ctx context.Context, t *taskfile.Task) error {
 	g, ctx := errgroup.WithContext(ctx)
 
+	reacquire := e.releaseConcurrencyLimit()
+	defer reacquire()
+
 	for _, d := range t.Deps {
 		d := d
 
@@ -343,6 +356,9 @@ func (e *Executor) runCommand(ctx context.Context, t *taskfile.Task, call taskfi
 
 	switch {
 	case cmd.Task != "":
+		reacquire := e.releaseConcurrencyLimit()
+		defer reacquire()
+
 		err := e.RunTask(ctx, taskfile.Call{Task: cmd.Task, Vars: cmd.Vars})
 		if err != nil {
 			return err
@@ -396,10 +412,19 @@ func getEnviron(t *taskfile.Task) []string {
 	}
 
 	environ := os.Environ()
+
 	for k, v := range t.Env.ToCacheMap() {
-		if s, ok := v.(string); ok {
+		str, isString := v.(string)
-			environ = append(environ, fmt.Sprintf("%s=%s", k, s))
+		if !isString {
+			continue
 		}
+
+		if _, alreadySet := os.LookupEnv(k); alreadySet {
+			continue
 		}
+
+		environ = append(environ, fmt.Sprintf("%s=%s", k, str))
+	}
+
 	return environ
 }

task_test.go

@@ -126,6 +126,7 @@ func TestVarsV3(t *testing.T) {
 			"var-order.txt":    "ABCDEF\n",
 			"dependent-sh.txt": "123456\n",
 			"with-call.txt":    "Hi, ABC123!\n",
+			"from-dot-env.txt": "From .env file\n",
 		},
 	}
 	tt.Run(t)
@@ -170,6 +171,22 @@ func TestVarsInvalidTmpl(t *testing.T) {
 	assert.EqualError(t, e.Run(context.Background(), taskfile.Call{Task: target}), expectError, "e.Run(target)")
 }
 
+func TestConcurrency(t *testing.T) {
+	const (
+		dir    = "testdata/concurrency"
+		target = "default"
+	)
+
+	e := &task.Executor{
+		Dir:         dir,
+		Stdout:      ioutil.Discard,
+		Stderr:      ioutil.Discard,
+		Concurrency: 1,
+	}
+	assert.NoError(t, e.Setup(), "e.Setup()")
+	assert.NoError(t, e.Run(context.Background(), taskfile.Call{Task: target}), "e.Run(target)")
+}
+
 func TestParams(t *testing.T) {
 	tt := fileContentTest{
 		Dir:       "testdata/params",

taskfile/var.go

@@ -75,7 +75,7 @@ func (vs *Vars) Range(yield func(key string, value Var) error) error {
 // ToCacheMap converts Vars to a map containing only the static
 // variables
 func (vs *Vars) ToCacheMap() (m map[string]interface{}) {
-	m = make(map[string]interface{}, len(vs.Keys))
+	m = make(map[string]interface{}, vs.Len())
 	vs.Range(func(k string, v Var) error {
 		if v.Sh != "" {
 			// Dynamic variable is not yet resolved; trigger
@@ -93,6 +93,14 @@ func (vs *Vars) ToCacheMap() (m map[string]interface{}) {
 	return
 }
 
+// Len returns the size of the map
+func (vs *Vars) Len() int {
+	if vs == nil {
+		return 0
+	}
+	return len(vs.Keys)
+}
+
 // Var represents either a static or dynamic variable.
 type Var struct {
 	Static string

testdata/concurrency/Taskfile.yml

@@ -0,0 +1,32 @@
+version: '2'
+
+tasks:
+  default:
+    deps:
+      - t1
+
+  t1:
+    deps:
+      - t3
+      - t4
+    cmds:
+      - task: t2
+      - echo done 1
+  t2:
+    deps:
+      - t5
+      - t6
+    cmds:
+      - echo done 2
+  t3:
+    cmds:
+      - echo done 3
+  t4:
+    cmds:
+      - echo done 4
+  t5:
+    cmds:
+      - echo done 5
+  t6:
+    cmds:
+      - echo done 6

testdata/vars/v3/.env

@@ -0,0 +1 @@
+DOT_ENV_VAR=From .env file

testdata/vars/v3/Taskfile.yml

@@ -1,5 +1,7 @@
 version: '3'
 
+dotenv: [.env]
+
 vars:
   VAR_A: A
   VAR_B: '{{.VAR_A}}B'
@@ -15,6 +17,7 @@ tasks:
     - task: var-order
     - task: dependent-sh
     - task: with-call
+    - task: from-dot-env
 
   missing-var: echo '{{.NON_EXISTING_VAR}}' > missing-var.txt
 
@@ -44,3 +47,5 @@ tasks:
       MESSAGE: Hi, {{.ABC123}}!
     cmds:
       - echo "{{.MESSAGE}}" > with-call.txt
+
+  from-dot-env: echo '{{.DOT_ENV_VAR}}' > from-dot-env.txt

variables.go

@@ -13,12 +13,27 @@ import (
 // CompiledTask returns a copy of a task, but replacing variables in almost all
 // properties using the Go template package.
 func (e *Executor) CompiledTask(call taskfile.Call) (*taskfile.Task, error) {
+	return e.compiledTask(call, true)
+}
+
+// FastCompiledTask is like CompiledTask, but it skippes dynamic variables.
+func (e *Executor) FastCompiledTask(call taskfile.Call) (*taskfile.Task, error) {
+	return e.compiledTask(call, false)
+}
+
+func (e *Executor) compiledTask(call taskfile.Call, evaluateShVars bool) (*taskfile.Task, error) {
 	origTask, ok := e.Taskfile.Tasks[call.Task]
 	if !ok {
 		return nil, &taskNotFoundError{call.Task}
 	}
 
-	vars, err := e.Compiler.GetVariables(origTask, call)
+	var vars *taskfile.Vars
+	var err error
+	if evaluateShVars {
+		vars, err = e.Compiler.GetVariables(origTask, call)
+	} else {
+		vars, err = e.Compiler.FastGetVariables(origTask, call)
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -59,6 +74,7 @@ func (e *Executor) CompiledTask(call taskfile.Call) (*taskfile.Task, error) {
 	new.Env = &taskfile.Vars{}
 	new.Env.Merge(r.ReplaceVars(e.Taskfile.Env))
 	new.Env.Merge(r.ReplaceVars(origTask.Env))
+	if evaluateShVars {
 		err = new.Env.Range(func(k string, v taskfile.Var) error {
 			static, err := e.Compiler.HandleDynamicVar(v, new.Dir)
 			if err != nil {
@@ -70,6 +86,7 @@ func (e *Executor) CompiledTask(call taskfile.Call) (*taskfile.Task, error) {
 		if err != nil {
 			return nil, err
 		}
+	}
 
 	if len(origTask.Cmds) > 0 {
 		new.Cmds = make([]*taskfile.Cmd, len(origTask.Cmds))