makepkg: Use SKIP in checksum to skip integrity check

Using the value of "SKIP" in the checksum array will cause that
integrity check to be skipped.  This makes building packages that
rely on user configurable sources less painful.

Based-on-patch-by: Dan McGee <dan@archlinux.org>
Based-on-patch-by: David Campbell <davekong@archlinux.us>
Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>

2 files changed, 15 insertions, 10 deletions

diff --git a/doc/PKGBUILD.5.txt b/doc/PKGBUILD.5.txt
index fad93e5c..a21c1dff 100644
--- a/doc/PKGBUILD.5.txt
+++ b/doc/PKGBUILD.5.txt
@@ -120,9 +120,10 @@ of the corresponding source file.
 *md5sums (array)*::
 	This array contains an MD5 hash for every source file specified in the
 	source array (in the same order). makepkg will use this to verify source
-	file integrity during subsequent builds. To easily generate md5sums, run
-	`makepkg -g >> PKGBUILD`. If desired, move the md5sums line to an
-	appropriate location.
+	file integrity during subsequent builds. If 'SKIP' is put in the array
+	in place of a normal hash, the integrity check for that source file will
+	be skipped. To easily generate md5sums, run ``makepkg -g >> PKGBUILD''.
+	If desired, move the md5sums line to an appropriate location.
 
 *sha1sums, sha256sums, sha384sums, sha512sums (arrays)*::
 	Alternative integrity checks that makepkg supports; these all behave
diff --git a/scripts/makepkg.sh.in b/scripts/makepkg.sh.in
index a4a3d13d..64b33c68 100644
--- a/scripts/makepkg.sh.in
+++ b/scripts/makepkg.sh.in
@@ -663,14 +663,18 @@ check_checksums() {
 				fi
 
 				if (( $found )) ; then
-					local expectedsum=$(tr '[:upper:]' '[:lower:]' <<< "${integrity_sums[$idx]}")
-					local realsum="$(openssl dgst -${integ} "$file")"
-					realsum="${realsum##* }"
-					if [[ $expectedsum = $realsum ]]; then
-						echo "$(gettext "Passed")" >&2
+					if [[ ${integrity_sums[$idx]} = 'SKIP' ]]; then
+						echo "$(gettext "Skipped")" >&2
 					else
-						echo "$(gettext "FAILED")" >&2
-						errors=1
+						local expectedsum=$(tr '[:upper:]' '[:lower:]' <<< "${integrity_sums[$idx]}")
+						local realsum="$(openssl dgst -${integ} "$file")"
+						realsum="${realsum##* }"
+						if [[ $expectedsum = $realsum ]]; then
+							echo "$(gettext "Passed")" >&2
+						else
+							echo "$(gettext "FAILED")" >&2
+							errors=1
+						fi
 					fi
 				fi