fix(clone): ssh connection may require user input (key unlocking etc)

Anything that requires user input (such as a key unlock or hostkey
verify) will block the terminal and wait for input which will never
come.

When cloning or configuring a repo via ssh we therefore initially
connect to gitlab to warm the connection.

Afterwards users are expected to either have setup a ssh ControlMaster
or use something like a ssh agent.

Fixes #148

Component: pkgctl repo clone/configure

Co-Authored-by: Christian Heusel <christian@heusel.eu>
Signed-off-by: Christian Heusel <christian@heusel.eu>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

src/lib/repo/clone.sh

@@ -12,6 +12,8 @@ source "${_DEVTOOLS_LIBRARY_DIR}"/lib/common.sh
 source "${_DEVTOOLS_LIBRARY_DIR}"/lib/api/gitlab.sh
 # shellcheck source=src/lib/repo/configure.sh
 source "${_DEVTOOLS_LIBRARY_DIR}"/lib/repo/configure.sh
+# shellcheck source=src/lib/util/git.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/util/git.sh
 
 source /usr/share/makepkg/util/message.sh
 
@@ -52,6 +54,7 @@ pkgctl_repo_clone() {
 	fi
 
 	# options
+	local protocol=ssh
 	local GIT_REPO_BASE_URL=${GIT_PACKAGING_URL_SSH}
 	local CLONE_ALL=0
 	local MAINTAINER=
@@ -72,6 +75,7 @@ pkgctl_repo_clone() {
 				;;
 			--protocol=https)
 				GIT_REPO_BASE_URL=${GIT_PACKAGING_URL_HTTPS}
+				protocol=https
 				CONFIGURE_OPTIONS+=("$1")
 				shift
 				;;
@@ -82,6 +86,7 @@ pkgctl_repo_clone() {
 				else
 					die "unsupported protocol: %s" "$2"
 				fi
+				protocol="$2"
 				CONFIGURE_OPTIONS+=("$1" "$2")
 				shift 2
 				;;
@@ -171,6 +176,12 @@ pkgctl_repo_clone() {
 		if [[ -n "${VERSION}" ]]; then
 			command+=" --switch '${VERSION}'"
 		fi
+
+		# warm up ssh connection as it may require user input (key unlock, hostkey verification etc)
+		if [[ ${protocol} == ssh ]]; then
+			git_warmup_ssh_connection
+		fi
+
 		if ! parallel --bar --jobs "${jobs}" "${command}" ::: "${pkgbases[@]}"; then
 			die 'Failed to clone some packages, please check the output'
 			exit 1

src/lib/repo/configure.sh

@@ -10,6 +10,8 @@ _DEVTOOLS_LIBRARY_DIR=${_DEVTOOLS_LIBRARY_DIR:-@pkgdatadir@}
 source "${_DEVTOOLS_LIBRARY_DIR}"/lib/common.sh
 # shellcheck source=src/lib/api/gitlab.sh
 source "${_DEVTOOLS_LIBRARY_DIR}"/lib/api/gitlab.sh
+# shellcheck source=src/lib/util/git.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/util/git.sh
 
 source /usr/share/makepkg/util/config.sh
 source /usr/share/makepkg/util/message.sh
@@ -188,6 +190,12 @@ pkgctl_repo_configure() {
 		if [[ -n ${BOLD} ]]; then
 			export DEVTOOLS_COLOR=always
 		fi
+
+		# warm up ssh connection as it may require user input (key unlock, hostkey verification etc)
+		if [[ ${proto} == ssh ]]; then
+			git_warmup_ssh_connection
+		fi
+
 		if ! parallel --bar --jobs "${jobs}" "${command}" ::: "${paths[@]}"; then
 			die 'Failed to configure some packages, please check the output'
 			exit 1

src/lib/util/git.sh

@@ -7,6 +7,9 @@ DEVTOOLS_INCLUDE_UTIL_GIT_SH=1
 
 _DEVTOOLS_LIBRARY_DIR=${_DEVTOOLS_LIBRARY_DIR:-@pkgdatadir@}
 
+# shellcheck source=src/lib/common.sh
+source "${_DEVTOOLS_LIBRARY_DIR}"/lib/common.sh
+
 
 git_diff_tree() {
 	local commit=$1
@@ -22,3 +25,10 @@ git_diff_tree() {
 		"${commit}" \
 		-- "${path}"
 }
+
+git_warmup_ssh_connection() {
+	msg 'Establishing ssh connection to git@%s' "${GITLAB_HOST}"
+	if ! ssh -T "git@${GITLAB_HOST}" >/dev/null; then
+		die 'Failed to establish ssh connection to git@%s' "${GITLAB_HOST}"
+	fi
+}