kas-container: mount /repo as read-write for shell command

There are some bitbake commands like `recipetool` that allows to easily
create new or append to existing recipes. This of course only works if
the main repository that is worked with is writeable.

However it is mounted into the container only as read-only.

This patch mounts the repository writeable when the `shell` command is use
and read-only in case of the `build` command.

It also adds `--repo-ro` and `--repo-rw` to allow overwriting the
default behaviour.

Signed-off-by: Claudius Heine <ch@denx.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas-container

@@ -53,6 +53,10 @@ usage()
 	printf "%b" "--aws-dir\t\tDirectory containing AWScli configuration.\n"
 	printf "%b" "--no-proxy-from-env\tDo not inherit proxy settings from " \
 		    "environment.\n"
+	printf "%b" "--repo-ro\t\tMount current repository read-only\n" \
+		    "\t\t\t(default for build command)\n"
+	printf "%b" "--repo-rw\t\tMount current repository writeable\n" \
+		    "\t\t\t(default for shell command)\n"
 	printf "%b" "\n"
 	printf "%b" "You can force the use of podman over docker using " \
 		    "KAS_CONTAINER_ENGINE=podman.\n"
@@ -166,6 +170,14 @@ while [ $# -gt 0 ]; do
 		KAS_NO_PROXY_FROM_ENV=1
 		shift 1
 		;;
+    --repo-ro)
+        KAS_REPO_MOUNT_OPT="ro"
+		shift 1
+		;;
+    --repo-rw)
+        KAS_REPO_MOUNT_OPT="rw"
+		shift 1
+		;;
 	-v | -d)
 		KAS_VERBOSE=1
 		KAS_OPTIONS_DIRECT="${KAS_OPTIONS_DIRECT} -d"
@@ -193,7 +205,14 @@ while [ $# -gt 0 ]; do
 		fi
 		exit 0
 		;;
-	build|shell)
+	shell)
+		KAS_REPO_MOUNT_OPT_DEFAULT="rw"
+		KAS_CMD=$1
+		shift 1
+		break
+		;;
+	build)
+		KAS_REPO_MOUNT_OPT_DEFAULT="ro"
 		KAS_CMD=$1
 		shift 1
 		break
@@ -269,6 +288,8 @@ KAS_REPO_DIR=$(git -C "${KAS_FILE_DIR}" rev-parse --show-toplevel 2>/dev/null) \
 	|| KAS_REPO_DIR=$(hg --cwd "${KAS_FILE_DIR}" root 2>/dev/null) \
 	|| KAS_REPO_DIR=${KAS_FILE_DIR}
 
+KAS_REPO_MOUNT_OPT="${KAS_REPO_MOUNT_OPT:-${KAS_REPO_MOUNT_OPT_DEFAULT}}"
+
 KAS_FILES=/repo/"$(echo "${KAS_FILES}" | sed 's|'"${KAS_REPO_DIR}"'/||g;s|:|:/repo/|g')"
 
 trace mkdir -p "${KAS_WORK_DIR}"
@@ -281,7 +302,7 @@ if [ "$(id -u)" -eq 0 ] && [ "${KAS_ALLOW_ROOT}" != "yes" ] ; then
 	exit 1
 fi
 
-set -- "$@" -v "${KAS_REPO_DIR}":/repo:ro \
+set -- "$@" -v "${KAS_REPO_DIR}":/repo:${KAS_REPO_MOUNT_OPT} \
 	-v "${KAS_WORK_DIR}":/work:rw --workdir=/work \
 	-v "${KAS_BUILD_DIR}":/build:rw \
 	-e KAS_BUILD_DIR=/build \