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#-*- tab-width: 4; -*-
# ex:ts=4
#
# bsd.destdir.mk - Support for chrooted installation
#
# Created by: Gabor Kovesdan <gabor@FreeBSD.org>
#
# $FreeBSD$
#
# Please make sure all changes to this file are passed through the maintainer.

DESTDIR_Include_MAINTAINER=     portmgr@FreeBSD.org

#
# The target order is always: pre-chroot do-chroot post-chroot
#
# pre-chroot
#           - You can use this for special preparation work, that
#             want to do before chrooting into the destination
#             environment and doing the real build.  At default
#             this target is empty.
#
# do-chroot
#           - This is the main target for doing the chrooted
#             operations.  It mounts the ports tree and devfs into
#             the destination environment and starts make(1)
#             by calling chroot(1).
#
# post-chroot
#           - This target runs chrooted just after chroot(1) was
#             called.  You can use this for special preparation
#             work for the chrooted build if necessary.  At
#             default, this target is empty.
#
# DESTDIR_ENV_LIST
#           - Contains names of the variables in host environ(7),
#             which should be imported into the chrooted environ
#             along with their values.
#             Default: empty.
#
# DESTDIR_MOUNT_LIST
#           - Contains the directories to mount into the
#             destination.  This is to make PORTSDIR, DISTDIR, etc.
#             available in the destination environment.  Three
#             forms of entries are allowed:
#             VAR
#               - Mounts the path contained by VAR into
#                 a temporary directory and sets VAR to that
#                 directory in the destination environ(7).
#             VAR:HOST_PATH
#               - Mounts HOST_PATH to a a temporary directory
#                 and sets VAR to that directory in the
#                 destination environ(7).
#             VAR:HOST_PATH:DEST_PATH
#               - Mounts HOST_PATH to DEST_PATH and sets VAR
#                 to DEST_PATH in the destination environ(7).
#             Default: PORTSDIR DISTDIR
#
# You can use something like this in host /etc/make.conf to
# customize per-chroot environment:
#   .if ${DESTDIR}=/foo/bar
#   PREFIX=/opt
#   CFLAGS=-O3 -pipe
#   DESTDIR_ENV_LIST=PREFIX CFLAGS
#   .endif
#

.if !defined(_DESTDIRMKINCLUDED)

_DESTDIRMKINCLUDED= yes

.if defined(WITH_DESTDIR_DEBUG)
DEBUG_MSG=  ${ECHO_MSG} "DEBUG:"
.else
DEBUG_MSG=  ${TRUE}
.endif

DESTDIR_ENV_LIST?=
DESTDIR_ENV=    CHROOTED=yes PATH=${PATH} TERM=${TERM}
.for _var in ${DESTDIR_ENV_LIST:NDESTDIR:NCHROOTED:NPORTSDIR}
DESTDIR_ENV+=   ${_var}="${${_var}}"
.endfor

# Processing DESTDIR_MOUNT_LIST into something more machine-readable
# VAR:HOST_PATH:DEST_PATH
# VAR -> VAR:${VAR}:TMP
# VAR:HOST_PATH -> VAR:HOST_PATH:TMP
DESTDIR_MOUNT_LIST?=    PORTSDIR DISTDIR
_DESTDIR_MOUNT_LIST=
.for _entry in ${DESTDIR_MOUNT_LIST}
__entry=${_entry}
.if ${__entry:M*\:*\:*}
_DESTDIR_MOUNT_LIST+=   ${_entry}
.elif ${__entry:M*\:*}
_DESTDIR_MOUNT_LIST+=   ${_entry}:___temp___
.else
.if defined(${_entry}) && !empty(${_entry})
_DESTDIR_MOUNT_LIST+=   ${_entry}:${${_entry}}:___temp___
.endif
.endif
.endfor

.MAIN:  all
.for _target in ${.TARGETS}
${_target}: pre-chroot do-chroot
    @${TRUE}
.endfor

.if !target(pre-chroot)
pre-chroot:
    @${TRUE}
.endif

.if !target(do-chroot)
do-chroot:
    @if [ ! -d ${DESTDIR} ]; then \
        ${ECHO_MSG} "===>  Directory ${DESTDIR} does not exist"; \
        ${ECHO_MSG} "===>  Please set DESTDIR to a valid jail environment."; \
        exit 1; \
    fi; \
    _destdir=`${REALPATH} ${DESTDIR}`; \
    _mounted_entries_list=""; \
    _created_mountpoints_list=""; \
    _var_path_list=""; \
    ${ECHO_MSG} "===>  Creating some important subdirectories"; \
    for _dir in tmp dev; do \
        [ -d $${_destdir}/$${_dir} ] || \
            if ${MKDIR} $${_destdir}/$${_dir}; then \
                ${ECHO_MSG} "===> /$${_dir} subdirectory has been successfully created"; \
                _created_mountpoints_list="$${_destdir}/$${_dir} $${_created_mountpoints_list}"; \
            else \
                ${ECHO_MSG} "===> /$${_dir} subdirectory could not be created"; \
                exit 2; \
            fi; \
    done; \
    ${DEBUG_MSG} "_DESTDIR_MOUNT_LIST=${_DESTDIR_MOUNT_LIST}"; \
    for _entry in ${_DESTDIR_MOUNT_LIST}; do \
        ${DEBUG_MSG} "Processing $${_entry}"; \
        _mount_var=$${_entry%%:*}; \
        _tp=$${_entry#*:}; \
        _host_path=`${REALPATH} $${_tp%:*}`; \
        _dest_path=$${_entry##*:}; \
        _full_dest_path=`${REALPATH} -q $${_destdir}/$${_dest_path} || :`; \
        _entry_was_created=0; \
        _entry_should_mount=0; \
        ${DEBUG_MSG} "$${_mount_var}:$${_host_path}:$${_full_dest_path}"; \
        if [ "$${_dest_path}" = "___temp___" ]; then \
            ${DEBUG_MSG} "Creating temporary mount point"; \
            if _full_dest_path=`${MKTEMP} -d $${_destdir}/tmp/mountpoint.XXXXXX`; then \
                ${DEBUG_MSG} "Temporary mount point $${_full_dest_path} created successfully"; \
                _entry_was_created=1; \
                _entry_should_mount=1; \
                _dest_path=$${_full_dest_path#$${_destdir}}; \
                _created_mountpoints_list="$${_full_dest_path} $${_created_mountpoints_list}"; \
            else \
                ${ECHO_MSG} "===> Failed to create temporary mount point"; \
                exit 9; \
            fi; \
        else \
            ${DEBUG_MSG} "Checking if already mounted"; \
            if ${MOUNT}|${GREP} -qs "^$${_host_path} on $${_full_dest_path} ("; then \
                ${DEBUG_MSG} "$${_host_path} is already mounted on $${_full_dest_path}"; \
                _var_path_list="$${_var_path_list} $${_mount_var}=$${_dest_path}"; \
            else \
                ${DEBUG_MSG} "$${_host_path} is not mounted on $${_full_dest_path}"; \
                _entry_should_mount=1; \
            fi; \
        fi; \
        [ -d $${_full_dest_path} ] || \
            if ${MKDIR} $${_full_dest_path}; then \
                ${DEBUG_MSG} "Mount point $${_full_dest_path} created"; \
                _entry_was_created=1; \
                _created_mountpoints_list="$${_created_mountpoints_list} ${_full_dest_path}"; \
            else \
                ${ECHO_MSG} "===> Mount point $${_full_dest_path} could not be created"; \
                exit 7; \
            fi; \
        [ "$${_entry_should_mount}" = "0" ] || \
            if ${MOUNT_NULLFS} $${_host_path} $${_full_dest_path}; then \
                ${DEBUG_MSG} "Directory $${_host_path} mounted"; \
                _mounted_entries_list="$${_full_dest_path} $${_mounted_entries_list}"; \
                _var_path_list="$${_var_path_list} $${_mount_var}=$${_dest_path}"; \
            else \
                ${ECHO_MSG} "===> Dir $${_host_path} could not be mounted"; \
                [ "$${_entry_was_created}" = "0" ] || \
                    ${RMDIR} $${_full_dest_path} || ${TRUE}; \
                exit 8; \
            fi; \
    done; \
    ${DEBUG_MSG} "Handling devfs separately"; \
    _full_dest_path=$${_destdir}/dev; \
    ${MOUNT}|${GREP} -qs "^devfs on $${_full_dest_path} (" || \
        if ${MOUNT_DEVFS} $${_full_dest_path}; then \
            ${DEBUG_MSG} "devfs mounted"; \
            _mounted_entries_list="$${_full_dest_path} $${_mounted_entries_list}"; \
        else \
            ${ECHO_MSG} "===> devfs could not be mounted"; \
            [ -n "$${_created_mountpoints_list%%* $${_destdir}/dev *}" ] || \
                ${RMDIR} $${_destdir}/dev || ${TRUE}; \
            exit 9; \
        fi; \
    _var_path_list="$${_var_path_list} DEVFS=/dev"; \
    ${DEBUG_MSG} "Things we mounted: $${_mounted_entries_list}"; \
    ${DEBUG_MSG} "Things we created: $${_created_mountpoints_list}"; \
    ${DEBUG_MSG} "_var_path_list: $${_var_path_list}"; \
    ${ECHO_MSG} "===>  Starting chrooted make in ${DESTDIR}..."; \
    export $${_var_path_list}; \
    ${CHROOT} $${_destdir} ${SH} -c "\
        cd $${PORTSDIR}${.CURDIR:S|^${PORTSDIR}||}; \
        ${SETENV} -i ${DESTDIR_ENV} $${_var_path_list} ${MAKE} ${.TARGETS}" && \
        { status=$$?; ${ECHO_MSG} "===>  Chrooted make in ${DESTDIR} succeeded"; } || \
        { status=$$?; ${ECHO_MSG} "===>  Chrooted make in ${DESTDIR} failed"; }; \
        ${ECHO_MSG} "===>  Cleaning up..."; \
    for _entry in $${_mounted_entries_list}; do \
        ${UMOUNT} -f $${_entry} || ${TRUE}; \
    done; \
    for _entry in $${_created_mountpoints_list}; do \
        ${RMDIR} $${_entry} || ${TRUE}; \
    done; \
    exit $$status
.endif  # !target(do-chroot)
.endif  # !defined(_DESTDIRMKINCLUDED)