Added a script that can be used to show commit URLs during a `git push`.

Just symlink/copy it to .git/hooks/pre-push and make sure it's executable!

build-scripts/git-pre-push-hook.pl

@@ -0,0 +1,80 @@
+#!/usr/bin/perl -w
+
+# To use this script: symlink it to .git/hooks/pre-push, then "git push"
+#
+# This script is called by "git push" after it has checked the remote status,
+# but before anything has been pushed.  If this script exits with a non-zero
+# status nothing will be pushed.
+#
+# This hook is called with the following parameters:
+#
+# $1 -- Name of the remote to which the push is being done
+# $2 -- URL to which the push is being done
+#
+# If pushing without using a named remote those arguments will be equal.
+#
+# Information about the commits which are being pushed is supplied as lines to
+# the standard input in the form:
+#
+#   <local ref> <local sha1> <remote ref> <remote sha1>
+
+use warnings;
+use strict;
+
+my $remote = $ARGV[0];
+my $url = $ARGV[1];
+
+#print("remote: $remote\n");
+#print("url: $url\n");
+
+$url =~ s#^git\@github\.com\:#https://github.com/#i;
+my $commiturl = $url =~ /\Ahttps?:\/\/github.com\// ? "$url/commit/" : '';
+
+my $z40 = '0000000000000000000000000000000000000000';
+my $reported = 0;
+
+while (<STDIN>) {
+    chomp;
+    my ($local_ref, $local_sha, $remote_ref, $remote_sha) = split / /;
+    #print("local_ref: $local_ref\n");
+    #print("local_sha: $local_sha\n");
+    #print("remote_ref: $remote_ref\n");
+    #print("remote_sha: $remote_sha\n");
+
+    my $range = '';
+    if ($remote_sha eq $z40) {  # New branch, examine all commits
+        $range = $local_sha;
+    } else { # Update to existing branch, examine new commits
+        $range = "$remote_sha..$local_sha";
+    }
+
+    my $gitcmd = "git log --reverse --oneline --no-abbrev-commit '$range'";
+    open(GITPIPE, '-|', $gitcmd) or die("\n\n$0: Failed to run '$gitcmd': $!\n\nAbort push!\n\n");
+    while (<GITPIPE>) {
+        chomp;
+        if (/\A([a-fA-F0-9]+)\s+(.*?)\Z/) {
+            my $hash = $1;
+            my $msg = $2;
+
+            if (!$reported) {
+                print("\nCommits expected to be pushed:\n");
+                $reported = 1;
+            }
+
+            #print("hash: $hash\n");
+            #print("msg: $msg\n");
+
+            print("$commiturl$hash -- $msg\n");
+        } else {
+            die("$0: Unexpected output from '$gitcmd'!\n\nAbort push!\n\n");
+        }
+    }
+    die("\n\n$0: Failing exit code from running '$gitcmd'!\n\nAbort push!\n\n") if !close(GITPIPE);
+}
+
+print("\n") if $reported;
+
+exit(0);  # Let the push go forward.
+
+# end of git-pre-push-hook.pl ...
+