common: implement find_cached_package

This function (currently) searches through $PWD and $PKGDEST looking
for a tarball matching the requested package name, architecture, and
pkgver. If found, it writes the full path to the located package to
stdout and returns 0, else 1. If more than 1 match is found, it's
treated as an error and the user will need to figure out what to do.

Use this in checkpkg and commitpkg, which previously implemented their
own less complete logic, to locate the build artifacts they rely on.

Signed-off-by: Dave Reisner <dreisner@archlinux.org>
Signed-off-by: Pierre Schmitz <pierre@archlinux.de>

1 files changed, 69 insertions, 0 deletions

diff --git a/lib/common.sh b/lib/common.sh
index 3ec26ff..1812cb7 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -1,6 +1,8 @@
 # Avoid any encoding problems
 export LANG=C
 
+shopt -s extglob
+
 # check if messages are to be printed using color
 unset ALL_OFF BOLD BLUE GREEN RED YELLOW
 if [[ -t 2 ]]; then
@@ -154,3 +156,70 @@ slock() {
 		stat_done
 	fi
 }
+
+##
+# usage: pkgver_equal( $pkgver1, $pkgver2 )
+##
+pkgver_equal() {
+	local left right
+
+	if [[ $1 = *-* && $2 = *-* ]]; then
+		# if both versions have a pkgrel, then they must be an exact match
+		[[ $1 = "$2" ]]
+	else
+		# otherwise, trim any pkgrel and compare the bare version.
+		[[ ${1%%-*} = "${2%%-*}" ]]
+	fi
+}
+
+##
+#  usage: find_cached_package( $pkgname, $pkgver, $arch )
+#
+#    $pkgver can be supplied with or without a pkgrel appended.
+#    If not supplied, any pkgrel will be matched.
+##
+find_cached_package() {
+	local searchdirs=("$PWD" "$PKGDEST") results=()
+	local targetname=$1 targetver=$2 targetarch=$3
+	local dir pkg pkgbasename pkgparts name ver rel arch size results
+
+	for dir in "${searchdirs[@]}"; do
+		[[ -d $dir ]] || continue
+
+		for pkg in "$dir"/*.pkg.tar?(.?z); do
+			[[ -f $pkg ]] || continue
+
+			# split apart package filename into parts
+			pkgbasename=${pkg##*/}
+			pkgbasename=${pkgbasename%.pkg.tar?(.?z)}
+
+			arch=${pkgbasename##*-}
+			pkgbasename=${pkgbasename%-"$arch"}
+
+			rel=${pkgbasename##*-}
+			pkgbasename=${pkgbasename%-"$rel"}
+
+			ver=${pkgbasename##*-}
+			name=${pkgbasename%-"$ver"}
+
+			if [[ $targetname = "$name" && $targetarch = "$arch" ]] &&
+					pkgver_equal "$targetver" "$ver-$rel"; then
+				results+=("$pkg")
+			fi
+		done
+	done
+
+	case ${#results[*]} in
+		0)
+			return 1
+			;;
+		1)
+			printf '%s\n' "$results"
+			return 0
+			;;
+		*)
+			error 'Multiple packages found:'
+			printf '\t%s\n' "${results[@]}"
+			return 1
+	esac
+}