1 files changed, 53 insertions, 0 deletions
diff --git a/python/cryptography/cryptography.SlackBuild b/python/cryptography/cryptography.SlackBuild
index a2a609684dde0..7fa20362b6f33 100644
--- a/python/cryptography/cryptography.SlackBuild
+++ b/python/cryptography/cryptography.SlackBuild
@@ -71,6 +71,59 @@ cd $TMP
 rm -rf $PRGNAM-$VERSION
 tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
 cd $PRGNAM-$VERSION
+
+# build offline
+# configuration tells cargo to use the configured directory
+# for dependencies intead of downloading from crates.io
+mkdir .cargo
+cat << EOF >> .cargo/config
+[source.crates-io]
+registry = 'https://github.com/rust-lang/crates.io-index'
+replace-with = 'vendored-sources'
+
+[source.vendored-sources]
+directory = '$(pwd)/src/rust/vendor'
+EOF
+
+(
+  cd src/rust
+
+  # deps and versions come from Cargo.lock
+  mkdir vendor
+  cd vendor
+
+  grep -h -A 3 "\[\[package\]\]" $(find ../ -maxdepth 1 -mindepth 1 -name Cargo.lock | tr '\n' ' ') | \
+    sed 's/[[:space:]]*=[[:space:]]*/=/g;s/^--//;s/^\[\[/--\n[[/' | \
+    awk 'BEGIN { RS = "--\n" ; FS="\n" } { print $2, $3, $4 }' | sed 's/"//g;s/name=//;s/ version=/=/' | \
+    grep crates\.io-index | sed 's/ source=.*$//' | sort -u | while read -r dep ; do
+
+    ver="$(printf "%s\n" "$dep" | cut -d= -f2)"
+    dep="$(printf "%s\n" "$dep" | cut -d= -f1)"
+
+    tar xvf $CWD/$dep-$ver.crate
+
+    touch $dep-$ver/.cargo-ok
+
+    # generate checksum
+    {
+      printf "{\n"
+      printf '    "files": {\n'
+
+      (
+        cd $dep-$ver
+        find . -type f -print0 | xargs -0 sha256sum | sed -n '/\.cargo-checksum\.json/!p' | sed 's/\.\///;s/^\([^ ]*\)[[:space:]][[:space:]]*\(.*\)$/"\2":"\1",/'
+      ) | sed '$ s/,$//'
+
+      printf "    },\n"
+      printf '    "package": "'
+
+      sha256sum "$CWD/$dep-$ver.crate" | cut -f1 -d' ' | sed 's/$/"/'
+
+      printf "}\n"
+    } > $dep-$ver/.cargo-checksum.json
+  done
+)
+
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \