unified checks for variable initialisation

new function chkvars() does the job

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

include/git.sh

@@ -52,8 +52,7 @@ fetch_project_repo()
 	eval "$(setvars "" xtree tree_depend)"
 
 	scan_config "$project" "config/git"
-	[ -z "${loc+x}" ] && $err "fetch_project_repo $project: loc not set"
-	[ -z "${url+x}" ] && $err "fetch_project_repo $project: url not set"
+	chkvars loc url
 
 	[ -n "$xtree" ] && [ ! -d "src/coreboot/$xtree" ] && \
 		x_ ./update trees -f coreboot "$xtree"
@@ -87,7 +86,7 @@ git_prep()
 	_patchdir="$3" # $1 and $2 are gitrepo and gitrepo_backup
 	_loc="$4"
 
-	[ -z "${rev+x}" ] && $err "git_prep $_loc: rev not set"
+	chkvars rev
 
 	tmpclone "$1" "$2" "$tmpgit" "$rev" "$_patchdir"
 	if singletree "$project" || [ $# -gt 4 ]; then
@@ -130,9 +129,7 @@ fetch_submodule()
 
 	[ -z "$st" ] && return 0 # subrepo/subfile not defined
 
-	for mvar in "sub${st}" "sub${st}_bkup" "subhash"; do
-		eval "[ -n \"\$$mvar\" ] || $err \"$1, $mdir: $mvar unset\""
-	done
+	chkvars "sub${st}" "sub${st}_bkup" "subhash"
 
 	if [ "$st" = "repo" ]; then
 		rm -Rf "$tmpgit/$1" || $err "!rm '$mdir' '$1'"

include/lib.sh

@@ -41,6 +41,12 @@ setvars()
 	done
 	printf "%s\n" "${_setvars% }"
 }
+chkvars()
+{
+	for var in $@; do
+		eval "[ -n "\${$var+x}" ] || \$err \"$var unset\""
+	done
+}
 
 eval "$(setvars "" xbmk_release tmpdir _nogit version board boarddir relname \
     versiondate threads projectname projectsite aur_notice cfgsdir datadir)"
@@ -112,7 +118,7 @@ versiondate_="$versiondate"
 [ ! -e ".git" ] || versiondate="$(git show --no-patch --no-notes \
     --pretty='%ct' HEAD)" || versiondate="$versiondate_"
 for p in projectname version versiondate projectsite; do
-	eval "[ -n \"\$$p\" ] || $err \"$p unset\""
+	chkvars "$p"
 	eval "x_ printf \"%s\\n\" \"\$$p\" > $p"
 done
 relname="$projectname-$version"

script/trees

@@ -129,7 +129,7 @@ handle_src_tree()
 	load_project_config "$target_dir"
 	x_ mkdir -p "$elfdir/$target"
 
-	[ -z "$tree" ] && $err "handle_src_tree $project/$tree: tree unset"
+	chkvars tree
 	cdir="src/$project/$tree"
 
 	if [ ! -d "$cdir" ]; then
@@ -277,8 +277,7 @@ mkpayload_grub()
 
 	. "$grubdata/module/$tree" || $err "$tree: !source grub modules"
 
-	[ -z "$grub_install_modules" ] && $err "$tree: install modules unset"
-	[ -z "$grub_modules" ] && $err "$tree: modules unset"
+	chkvars "grub_install_modules" "grub_modules"
 
 	"${cdir}/grub-mkstandalone" --grub-mkimage="${cdir}/grub-mkimage" \
 	    -O i386-coreboot -o "${cdir}/grub.elf" -d "${cdir}/grub-core/" \