attempt to fix ever-changing checksum

The checksum of the source archive often changes without any evident
modification of its content. At the moment, I can only speculate about
why that happens.

Perhaps Dropbox compresses the files on the fly changing the checksum of
the archive, but not the contents, whenever some detail of the
compression process changes.

Fortunately, bsdtar can re-compressing archives as part of a pipe. This
way, it can be inserted as a DLAGENT so that it does its work before
makepkg computes the checksum.

1 files changed, 10 insertions, 1 deletions

diff --git a/PKGBUILD b/PKGBUILD
index 1731d99b44e7..1d2f40c70ec8 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -10,7 +10,16 @@ url="http://opendesktop.org/content/show.php?content=170523"
 license=('GPL3')
 optdepends=("gtk-engine-murrine: for GTK2 themes")
 source=("${pkgname}.tar.gz::https://www.dropbox.com/s/4ik0pbbpsiqe4ci/Aurora-${pkgver%.*}.tar.gz?dl=1")
-sha256sums=('28fc4b3ba2e70ee6e7fe6d1e4785be4e9f4064dae58440f02e077752c7a6e780')
+sha256sums=('b47691e1effb39ba85baa88e161fab8ae3c7e3baafd303d3b2f77e0ebb63750f')
+
+# The archive downloaded from Dropbox seems to change its hash without any
+# evident content change. This could originate from the compression of these
+# files on the fly, so recompressing it is an attempt to stabilize the checksum
+# only dependent on the actual contents.
+DLAGENTS=("https::/usr/bin/bash -c $(
+  printf '%s\n' "${DLAGENTS[@]}" | sed -n 's/https::\(.*\)/\1/p' \
+    | sed 's/-[^ ] %o //' | sed 's/ /\\ /g'
+)\ |\ bsdtar\ -caf\ %o\ @-")
 
 pkgver() {
   dir="$(echo Aurora-*)"