Add a simple script for downstream maintenance

Author: mrc0mmand

scripts/git-migrate.sh

@@ -0,0 +1,83 @@
+#!/usr/bin/bash
+
+function confirmation() {
+    read -p "$1 (y/n)" -n 1 -r
+    echo
+    if ! [[ $REPLY =~ ^[Yy]$ ]]; then
+        exit 1
+    fi
+}
+
+if [[ $# -eq 0 ]]; then
+    echo "Usage: $0 commit commit commit ..."
+    exit 1
+fi
+
+GIT_ROOT="$(basename $(git rev-parse --show-toplevel))"
+if [[ "$GIT_ROOT" =~ (openssl|nss|gnutls) ]]; then
+    GIT_TYPE="downstream"
+else
+    GIT_TYPE="upstream"
+fi
+
+echo -e "git root directory is '$GIT_ROOT' which is \e[1m$GIT_TYPE\e[0m"
+confirmation "Is this information correct?"
+if [[ "$GIT_TYPE" == "downstream" ]]; then
+    echo "This directory will be used as a component name for a path substitution"
+    confirmation "Is this setup OK?"
+fi
+
+echo "Requested patches for following commits:"
+git show -s --oneline $@
+
+echo "-------------------"
+
+for commit in "$@"; do
+    echo "Generating patch for $commit"
+    patch="$(git format-patch -1 $commit)"
+    if [[ $? -eq 0 && -n $patch ]]; then
+        tmpfile="$(mktemp)"
+        mv "$patch" "$tmpfile"
+        awk -v dstr_comp="$GIT_ROOT" '
+        function bold(text) {
+            return "\033[1m" text "\033[0m";
+        }
+        function green(text) {
+            return "\033[32m" text "\033[39m";
+        }
+        function red(text) {
+            return "\033[31m" text "\033[39m";
+        }
+
+        # Match diff paths, eg.:
+        # --- a/openssl/Interoperability/CC-openssl-with-gnutls/runtest.sh
+        # +++ b/openssl/Interoperability/CC-openssl-with-gnutls/runtest.sh
+        match($0, /^[+-]{3} [ab]\/([^\/]+)\/.+$/, m) {
+            if(m[1] ~ /(openssl|nss|gnutls)/) {
+                # First path component is a component name => upstream repo
+                # Supported components: openssl, nss, gnutls
+                print "Found an " bold("upstream") " path: " green($0) > "/dev/stderr"
+                # Remove the component name from the path
+                $0 = gensub(/^([+-]{3} [ab])\/[^\/]+(\/.+)$/,
+                       "\\1\\2", 1, $0);
+                print "Rewriting this path to: " red($0) > "/dev/stderr"
+            } else if(m[1] ~ /(Interoperability)/) {
+                # First path component is a test type => downstream repo
+                # Supported test types: Interoperability
+                print "Found a " bold("downstream") " path: " green($0) > "/dev/stderr"
+                # Prepend the component name to the path
+                $0 = gensub(/^([+-]{3} [ab]\/)([^\/]+\/.+)$/,
+                       "\\1" dstr_comp "/\\2", 1, $0);
+                print "Rewriting this path to:  " red($0)> "/dev/stderr"
+            }
+        }
+        {
+            print $0;
+        }
+        ' "$tmpfile" > "$patch"
+        echo "Patch saved as $patch"
+        rm "$tmpfile"
+    else
+        echo >&2 "git format-patch failed: ($patch)"
+    fi
+done