Add DownloadOnly option

It allows to download only the packages, without
installing/upgrading/replacing them

Fixes #179

cmd/install.go

@@ -89,6 +89,7 @@ To force install a package:
 		onlydeps := LuetCfg.Viper.GetBool("onlydeps")
 		concurrent, _ := cmd.Flags().GetBool("solver-concurrent")
 		yes := LuetCfg.Viper.GetBool("yes")
+		downloadOnly, _ := cmd.Flags().GetBool("download-only")
 
 		dbpath := LuetCfg.Viper.GetString("system.database_path")
 		rootfs := LuetCfg.Viper.GetString("system.rootfs")
@@ -121,6 +122,7 @@ To force install a package:
 			Force:                       force,
 			OnlyDeps:                    onlydeps,
 			PreserveSystemEssentialData: true,
+			DownloadOnly:                downloadOnly,
 			Ask:                         !yes,
 		})
 		inst.Repositories(repos)
@@ -147,6 +149,7 @@ func init() {
 	installCmd.Flags().Bool("force", false, "Skip errors and keep going (potentially harmful)")
 	installCmd.Flags().Bool("solver-concurrent", false, "Use concurrent solver (experimental)")
 	installCmd.Flags().BoolP("yes", "y", false, "Don't ask questions")
+	installCmd.Flags().Bool("download-only", false, "Download only")
 
 	RootCmd.AddCommand(installCmd)
 }

cmd/replace.go

@@ -66,6 +66,7 @@ var replaceCmd = &cobra.Command{
 		dbpath := LuetCfg.Viper.GetString("system.database_path")
 		rootfs := LuetCfg.Viper.GetString("system.rootfs")
 		engine := LuetCfg.Viper.GetString("system.database_engine")
+		downloadOnly, _ := cmd.Flags().GetBool("download-only")
 
 		LuetCfg.System.DatabaseEngine = engine
 		LuetCfg.System.DatabasePath = dbpath
@@ -121,6 +122,7 @@ var replaceCmd = &cobra.Command{
 			OnlyDeps:                    onlydeps,
 			PreserveSystemEssentialData: true,
 			Ask:                         !yes,
+			DownloadOnly:                downloadOnly,
 		})
 		inst.Repositories(repos)
 
@@ -148,6 +150,7 @@ func init() {
 	replaceCmd.Flags().Bool("solver-concurrent", false, "Use concurrent solver (experimental)")
 	replaceCmd.Flags().BoolP("yes", "y", false, "Don't ask questions")
 	replaceCmd.Flags().StringSlice("for", []string{}, "Packages that has to be installed in place of others")
+	replaceCmd.Flags().Bool("download-only", false, "Download only")
 
 	RootCmd.AddCommand(replaceCmd)
 }

cmd/upgrade.go

@@ -66,6 +66,7 @@ var upgradeCmd = &cobra.Command{
 		dbpath := LuetCfg.Viper.GetString("system.database_path")
 		rootfs := LuetCfg.Viper.GetString("system.rootfs")
 		engine := LuetCfg.Viper.GetString("system.database_engine")
+		downloadOnly, _ := cmd.Flags().GetBool("download-only")
 
 		LuetCfg.System.DatabaseEngine = engine
 		LuetCfg.System.DatabasePath = dbpath
@@ -96,6 +97,7 @@ var upgradeCmd = &cobra.Command{
 			UpgradeNewRevisions:         sync,
 			PreserveSystemEssentialData: true,
 			Ask:                         !yes,
+			DownloadOnly:                downloadOnly,
 		})
 		inst.Repositories(repos)
 
@@ -123,6 +125,7 @@ func init() {
 	upgradeCmd.Flags().Bool("sync", false, "Upgrade packages with new revisions (experimental)")
 	upgradeCmd.Flags().Bool("solver-concurrent", false, "Use concurrent solver (experimental)")
 	upgradeCmd.Flags().BoolP("yes", "y", false, "Don't ask questions")
+	upgradeCmd.Flags().Bool("download-only", false, "Download only")
 
 	RootCmd.AddCommand(upgradeCmd)
 }

pkg/installer/installer.go

@@ -47,6 +47,7 @@ type LuetInstallerOptions struct {
 	CheckConflicts                                                 bool
 	SolverUpgrade, RemoveUnavailableOnUpgrade, UpgradeNewRevisions bool
 	Ask                                                            bool
+	DownloadOnly                                                   bool
 }
 
 type LuetInstaller struct {
@@ -304,6 +305,9 @@ func (l *LuetInstaller) swap(syncedRepos Repositories, toRemove pkg.Packages, to
 	if err := l.download(syncedRepos, match); err != nil {
 		return errors.Wrap(err, "Pre-downloading packages")
 	}
+	if l.Options.DownloadOnly {
+		return nil
+	}
 
 	err = l.Uninstall(s, toRemove...)
 	if err != nil && !l.Options.Force {
@@ -530,6 +534,10 @@ func (l *LuetInstaller) install(syncedRepos Repositories, toInstall map[string]A
 		return errors.Wrap(err, "Downloading packages")
 	}
 
+	if l.Options.DownloadOnly {
+		return nil
+	}
+
 	all := make(chan ArtifactMatch)
 
 	wg := new(sync.WaitGroup)

tests/integration/01_simple_downloadonly.sh

@@ -0,0 +1,80 @@
+#!/bin/bash
+
+export LUET_NOLOCK=true
+
+oneTimeSetUp() {
+export tmpdir="$(mktemp -d)"
+}
+
+oneTimeTearDown() {
+    rm -rf "$tmpdir"
+}
+
+testBuild() {
+    mkdir $tmpdir/testbuild
+    luet build --tree "$ROOT_DIR/tests/fixtures/buildableseed" --destination $tmpdir/testbuild --compression gzip test/c > /dev/null
+    buildst=$?
+    assertEquals 'builds successfully' "$buildst" "0"
+    assertTrue 'create package dep B' "[ -e '$tmpdir/testbuild/b-test-1.0.package.tar.gz' ]"
+    assertTrue 'create package' "[ -e '$tmpdir/testbuild/c-test-1.0.package.tar.gz' ]"
+}
+
+testRepo() {
+    assertTrue 'no repository' "[ ! -e '$tmpdir/testbuild/repository.yaml' ]"
+    luet create-repo --tree "$ROOT_DIR/tests/fixtures/buildableseed" \
+    --output $tmpdir/testbuild \
+    --packages $tmpdir/testbuild \
+    --name "test" \
+    --descr "Test Repo" \
+    --urls $tmpdir/testrootfs \
+    --type disk > /dev/null
+
+    createst=$?
+    assertEquals 'create repo successfully' "$createst" "0"
+    assertTrue 'create repository' "[ -e '$tmpdir/testbuild/repository.yaml' ]"
+}
+
+testConfig() {
+    mkdir $tmpdir/testrootfs
+    cat <<EOF > $tmpdir/luet.yaml
+general:
+  debug: true
+system:
+  rootfs: $tmpdir/testrootfs
+  database_engine: "memory"
+config_from_host: true
+repositories:
+   - name: "main"
+     type: "disk"
+     enable: true
+     urls:
+       - "$tmpdir/testbuild"
+EOF
+    luet config --config $tmpdir/luet.yaml
+    res=$?
+    assertEquals 'config test successfully' "$res" "0"
+}
+
+testDownloadOnly() {
+    luet install -y --download-only --config $tmpdir/luet.yaml test/c > /dev/null
+    installst=$?
+    assertEquals 'install test successfully' "$installst" "0"
+    assertTrue 'package not installed' "[ ! -e '$tmpdir/testrootfs/c' ]"
+    assertTrue 'cache populated' "[ -e '$tmpdir/testrootfs/var/cache/luet/packages/c-test-1.0.package.tar.gz' ]"
+
+    luet install -y --config $tmpdir/luet.yaml test/c > /dev/null
+    installst=$?
+    assertEquals 'install test successfully' "$installst" "0"
+    assertTrue 'package installed' "[ -e '$tmpdir/testrootfs/c' ]"
+}
+
+testCleanup() {
+    luet cleanup --config $tmpdir/luet.yaml > /dev/null
+    installst=$?
+    assertEquals 'install test successfully' "$installst" "0"
+    assertTrue 'package installed' "[ ! -e '$tmpdir/testrootfs/packages/c-test-1.0.package.tar.gz' ]"
+}
+
+# Load shUnit2.
+. "$ROOT_DIR/tests/integration/shunit2"/shunit2
+