remove xbmk_parent, handle forking in lib.sh

I was using a complicated method of knowing whether
the current instance was parent or a child, to know
whether the lock file and TMPDIR needed to be purged.

It was quite error-prone too. Instead, I'm now handling
it directly from within the if statement that previously
initialised xbmk_parent=y, forking ./mk from there.

The forked instance would not trigger that if clause
again, since then TMPDIR is created, thus avoiding
recursion.

This is an improvement because it doesn't rely on how
the parent handles exit statuses, and it ensures that
the lock/tmp files are never accidentally deleted.

Even if a given program/script that cbmk runs would
export TMPDIR, it doesn't matter because cbmk doesn't,
so it would be unaffected.

Signed-off-by: Leah Rowe <leah@libreboot.org>

include/inject.sh

@@ -21,7 +21,7 @@ fail_inject()
 	    rm -Rf "$tmpromdel" || :
 	printf "\n\n%s\n\n" "$dontflash" 1>&2
 	printf "WARNING: File '%s' was NOT modified.\n\n" "$archive" 1>&2
-	fail "$1"
+	$err "$1"
 }
 
 xbmk_inject()

include/lib.sh

@@ -50,7 +50,7 @@ chkvars()
 }
 
 eval "`setvars "" _nogit board reinstall versiondate aur_notice configdir \
-    datadir version relname xbmk_parent`"
+    datadir version relname`"
 
 for fv in version versiondate; do
 	eval "[ ! -f \".$fv\" ] || read -r $fv < \".$fv\" || :"
@@ -140,7 +140,12 @@ if [ -z "${TMPDIR+x}" ]; then
 	cd "$XBMK_CACHE/xbmkpath" || $err "can't cd $XBMK_CACHE/xbmkpath"
 	x_ ln -s "`command -v "$python"`" python
 	) || $err "Can't set up python symlink in $XBMK_CACHE/xbmkpath"
-	xbmk_parent="y"
+
+	xbmk_rval=0
+	./mk "$@" || xbmk_rval=1
+	rm -Rf "$TMPDIR" || xbmk_rval=1
+	rm -f lock || xbmk_rval=1
+	exit $xbmk_rval
 fi
 
 # if "y": a coreboot target won't be built if target.cfg says release="n"

mk

@@ -16,7 +16,6 @@ fi
 . "include/inject.sh"
 
 eval "`setvars "" vdir src_dirname srcdir mode xp ser`"
-err="fail"
 
 main()
 {
@@ -115,23 +114,7 @@ build_release()
 	rm -Rf "$srcdir" || $err "!rm -Rf $srcdir"
 }
 
-fail()
-{
-	tmp_cleanup || printf "WARNING: can't rm tmpfiles: %s\n" "$TMPDIR" 1>&2
-	err_ "${1}"
-}
-
-tmp_cleanup()
-{
-	[ "$xbmk_parent" = "y" ] || return 0
-	[ "$TMPDIR" = "/tmp" ] || rm -Rf "$TMPDIR" || return 1
-	rm -f lock || return 1
-}
-
-if main "$@"; then
-	tmp_cleanup || err_ "can't rm TMPDIR upon non-zero exit: $TMPDIR"
-	exit 0
-fi
+main "$@" && exit 0
 
 # what follows was formerly script/trees, whose main() is now trees()
 
@@ -521,5 +504,3 @@ if trees "$@"; then
 	. "$mkhelpercfg"
 	$cmd
 fi
-
-tmp_cleanup || err_ "can't rm TMPDIR upon non-zero exit: $TMPDIR"