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add script for managing 'build environments' (.config+files/), including documentation
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@12212 3c298f89-4303-0410-b956-a3cf2f4a3e73
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@ -483,3 +483,60 @@ Other useful targets include:
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\item \texttt{make package/\textit{<name>}/configure V=99}
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\end{itemize}
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\subsection{Using build environments}
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OpenWrt provides a means of building images for multiple configurations
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which can use multiple targets in one single checkout. These \emph{environments}
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store a copy of the .config file generated by \texttt{make menuconfig} and the contents
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of the \texttt{./files} folder.
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The script \texttt{./scripts/env} is used to manage these environments, it uses
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\texttt{git} (which needs to be installed on your system) as backend for version control.
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The command
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\begin{Verbatim}
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\texttt{./scripts/env help}
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\end{Verbatim}
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produces a short help text with a list of commands.
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To create a new environment named \texttt{current}, run the following command
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\begin{Verbatim}
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./scripts/env new current
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\end{Verbatim}
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This will move your \texttt{.config} file and \texttt{./files} (if it exists) to
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the \texttt{env/} subdirectory and create symlinks in the base folder.
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After running make menuconfig or changing things in files/, your current state will
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differ from what has been saved before. To show these changes, use:
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\begin{Verbatim}
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./scripts/env diff
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\end{Verbatim}
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If you want to save these changes, run:
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\begin{Verbatim}
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./scripts/env save
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\end{Verbatim}
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If you want to revert your changes to the previously saved copy, run:
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\begin{Verbatim}
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./scripts/env revert
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\end{Verbatim}
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If you want, you can now create a second environment using the \texttt{new} command.
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It will ask you whether you want to make it a clone of the current environment (e.g.
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for minor changes) or if you want to start with a clean version (e.g. for selecting
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a new target).
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To switch to a different environment (e.g. \texttt{test1}), use:
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\begin{Verbatim}
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./scripts/env switch test1
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\end{Verbatim}
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To rename the current branch to a new name (e.g. \texttt{test2}), use:
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\begin{Verbatim}
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./scripts/env rename test2
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\end{Verbatim}
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If you want to get rid of environment switching and keep everything in the base directory
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again, use:
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\begin{Verbatim}
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./scripts/env clear
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\end{Verbatim}
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219
scripts/env
Executable file
219
scripts/env
Executable file
@ -0,0 +1,219 @@
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#!/usr/bin/env bash
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BASEDIR="$PWD"
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ENVDIR="$PWD/env"
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usage() {
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cat <<EOF
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Usage: $0 [options] <command> [arguments]
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Commands:
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help This help text
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list List environments
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clear Delete all environment and revert to flat config/files
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new <name> Create a new environment
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switch <name> Switch to a different environment
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delete <name> Delete an environment
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rename <newname> Rename the current environment
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diff Show differences between current state and environment
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save Save your changes to the environment
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revert Revert your changes since last save
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Options:
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EOF
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exit ${1:-1}
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}
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error() {
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echo "$0: $*"
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exit 1
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}
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ask_bool() {
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local DEFAULT="$1"; shift
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local def defstr val
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case "$DEFAULT" in
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1) def=0; defstr="Y/n";;
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0) def=1; defstr="y/N";;
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*) def=; defstr="y/n";;
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esac
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while [ -z "$val" ]; do
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local VAL
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echo -n "$* ($defstr): "
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read VAL
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case "$VAL" in
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y*|Y*) val=0;;
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n*|N*) val=1;;
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*) val="$def";;
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esac
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done
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return "$val"
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}
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env_init() {
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local CREATE="$1"
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if [ -z "$CREATE" ]; then
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[ -d "$ENVDIR" ] || exit 0
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fi
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[ -x "$(which git 2>/dev/null)" ] || error "Git is not installed"
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mkdir -p "$ENVDIR" || error "Failed to create the environment directory"
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cd "$ENVDIR" || error "Failed to switch to the environment directory"
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[ -d .git ] || {
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git init &&
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touch .config &&
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mkdir files &&
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git-add . &&
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git-commit -q -m "Initial import"
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} || {
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rm -rf .git
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error "Failed to initialize the environment directory"
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}
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}
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env_sync_data() {
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[ \! -L "$BASEDIR/.config" -a -f "$BASEDIR/.config" ] && mv "$BASEDIR/.config" "$ENVDIR"
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git-add .
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git-add -u
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}
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env_sync() {
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local STR="$1"
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env_sync_data
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git-commit -m "${STR:-Update} at $(date)"
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}
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env_link_config() {
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rm -f "$BASEDIR/.config"
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ln -s env/.config "$BASEDIR/.config"
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mkdir -p "$ENVDIR/files"
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[ -L "$BASEDIR/files" ] || ln -s env/files "$BASEDIR/files"
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}
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env_do_reset() {
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git-reset --hard HEAD
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git-clean -d -f
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}
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env_list() {
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env_init
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git-branch | grep -vE '^. master$'
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}
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env_diff() {
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env_init
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env_sync_data
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git-diff --cached
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}
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env_save() {
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env_init
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env_sync
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env_link_config
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}
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env_revert() {
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env_init
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env_do_reset
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env_link_config
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}
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env_ask_sync() {
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LINES="$(env_diff | wc -l)" # implies env_init
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[ "$LINES" -gt 0 ] && {
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if ask_bool 1 "Do you want to save your changes"; then
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env_sync
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else
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env_sync_data
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env_do_reset
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fi
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}
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}
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env_clear() {
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env_init
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[ -L "$BASEDIR/.config" ] && rm -f "$BASEDIR/.config"
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[ -L "$BASEDIR/files" ] && rm -f "$BASEDIR/files"
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[ -f "$ENVDIR/.config" ] || ( cd "$ENVDIR/files" && find | grep -vE '^\.$' > /dev/null )
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env_sync_data
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if ask_bool 1 "Do you want to keep your current config and files"; then
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mkdir -p "$BASEDIR/files"
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cp -a "$ENVDIR/files/*" "$BASEDIR/files" 2>/dev/null >/dev/null
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cp "$ENVDIR/.config" "$BASEDIR/"
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else
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rm -rf "$BASEDIR/files" "$BASEDIR/.config"
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fi
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cd "$BASEDIR"
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rm -rf "$ENVDIR"
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}
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env_delete() {
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local name="${1##*/}"
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[ -z "$name" ] && usage
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[ -f "$envdir/.git/refs/heads/$name" ] || error "environment '$name' not found"
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branch="$(git-branch | grep '^\* ' | awk '{print $2}')"
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[ "$name" = "branch" ] && error "cannot delete the currently selected environment"
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git-branch -D "$name"
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}
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env_switch() {
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local name="${1##*/}"
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[ -z "$name" ] && usage
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[ -f "$envdir/.git/refs/heads/$name" ] || error "environment '$name' not found"
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env_init
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env_ask_sync
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git-checkout "$NAME"
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env_link_config
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}
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env_rename() {
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local NAME="${1##*/}"
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env_init
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git-branch -m "$NAME"
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}
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env_new() {
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local NAME="$1"
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local branch
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local from="master"
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[ -z "$NAME" ] && usage
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env_init 1
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branch="$(git-branch | grep '^\* ' | awk '{print $2}')"
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if [ -n "$branch" -a "$branch" != "master" ]; then
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env_ask_sync
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if ask_bool 0 "Do you want to clone the current environment?"; then
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from="$branch"
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fi
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rm -f "$BASEDIR/.config" "$BASEDIR/files"
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fi
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git-checkout -b "$1" "$from"
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if [ -f "$BASEDIR/.config" -o -d "$BASEDIR/files" ]; then
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if ask_bool 1 "Do you want to keep your current config and files?"; then
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[ -d "$BASEDIR/files" -a \! -L "$BASEDIR/files" ] && {
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mv "$BASEDIR/files/"* "$ENVDIR/" 2>/dev/null
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rmdir "$BASEDIR/files"
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}
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env_sync
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else
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rm -rf "$BASEDIR/.config" "$BASEDIR/files"
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fi
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fi
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env_link_config
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}
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COMMAND="$1"; shift
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case "$COMMAND" in
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help) usage 0;;
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new) env_new "$@";;
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list) env_list "$@";;
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clear) env_clear "$@";;
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switch) env_switch "$@";;
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delete) env_delete "$@";;
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rename) env_rename "$@";;
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diff) env_diff "$@";;
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save) env_save "$@";;
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revert) env_revert "$@";;
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*) usage;;
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esac
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