b3ec305 Fix bashisms in verify-commits and always check top commit's tree (Matt Corallo)
f20e664 Check gpg version before setting --weak-digest (Matt Corallo)
Tree-SHA512: f87247008ae6a265e3fd371f00aec0e84f1feb713bf5859eab139a88a4e205e1f26de7b510bcc2c3ab538d5443978a48ec920d25b52b9601e625d198fa2d725f
bbd7579 Fix regsig checking for subkey sigs in verify-commits (Matt Corallo)
d025bc7 Allow any subkey in verify-commits (Matt Corallo)
eddc77a Add comment re: why SHA1 is disabled (Peter Todd)
d9c450f Verify Tree-SHA512s in merge commits, enforce sigs are not SHA1 (Matt Corallo)
be908a6 Fail merge if there are any symlinks (Matt Corallo)
Tree-SHA512: bb66c59cc1c6b1c86d7d8be7adb0769c6598c0e28ad927409941f30af87d390521e82fc13700ee22e92db1bd571db3e19a152ec7b2c0349c6e06f5de62c0b65f