get.sh: put tmpclone dirs in xbtmp

and generate them, don't hardcode them - this reduces
the chance of race conditions, which we have seen in
the past and which current execution flow in xbmk even
mitigates in a few places, by doing things in a certain
order.

this change makes the code more robust and easier to
maintain.

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

include/get.sh

@@ -3,10 +3,7 @@
 # Copyright (c) 2022 Caleb La Grange <thonkpeasant@protonmail.com>
 
 eval "`setvars "" loc url bkup_url subcurl subhash subgit subgit_bkup \
-    depend subcurl_bkup`"
-
-tmpgit="$xbtmp/gitclone"
-tmpgitcache="$XBMK_CACHE/tmpgit"
+    depend subcurl_bkup tmpgit`"
 
 fetch_targets()
 {
@@ -31,7 +28,7 @@ clone_project()
 	loc="$XBMK_CACHE/clone/$project" && singletree "$project" && \
 	    loc="src/$project"
 
-	e "$loc" d missing && remkdir "${tmpgit%/*}" && git_prep \
+	e "$loc" d missing && git_prep \
 	    "$url" "$bkup_url" "$xbmkpwd/config/$project/patches" "$loc"; :
 }
 
@@ -42,6 +39,10 @@ git_prep()
 	_patchdir="$3"
 	_loc="$4" # $1 and $2 are gitrepo and gitrepo_backup
 
+	tmpgit="`mktemp -d || err "can't make tmpgit"`" || err
+	x_ rm -Rf "$tmpgit"
+	x_ mkdir -p "${tmpgit%/*}"
+
 	chkvars rev
 	xbget git "$1" "$2" "$tmpgit" "$rev" "$_patchdir"
 	if singletree "$project" || [ $# -gt 4 ]; then
@@ -134,7 +135,9 @@ try_copy()
 try_git()
 {
 	gitdest="`findpath "$1"`" || err "Can't get readpath for '$1'"
+	tmpgitcache="`mktemp -d || err "can't make tmpgitcache"`" || err
 	x_ rm -Rf "$tmpgitcache"
+	x_ mkdir -p "${tmpgitcache%/*}"
 
 	[ -d "$gitdest" ] || ( x_ git clone "$2" "$tmpgitcache" ) || return 1
 	[ -d "$gitdest" ] || x_ mkdir -p "${gitdest%/*}"

include/tree.sh

@@ -65,8 +65,6 @@ trees()
 	targets="$*"
 	cmd="build_targets $targets"
 	singletree "$project" && cmd="build_project"
-
-	remkdir "${tmpgit%/*}"
 }
 
 build_project()