sno show/diff doesn't work for initial import commits

[craigds]

There doesn't seem to be a way to view the content of an import commit.

Behold a fledgling sno repository:

$ sno log
commit 736a79dcb844a55e88813635b3535dd227635a87 (HEAD -> master)
Author: Craig de Stigter <[email protected]>
Date:   Tue Apr 7 13:55:50 2020 +1200

    Import from manawatu-whanganui-palmerston-north-lidar-index-tiles-2018.gpkg to /manawatu_whanganui_palmerston_north_lidar_index_tiles_2018/

None of the following commands produce much to show the commit's contents:

cdestigter@behindyou  $ sno diff 736a79dcb844a55e88813635b3535dd227635a87

cdestigter@behindyou  $ sno diff HEAD^..HEAD
Usage: sno diff [OPTIONS] [ARGS]...

Error: Invalid value for commit: Invalid commit spec

cdestigter@behindyou  $ sno show
commit 736a79dcb844a55e88813635b3535dd227635a87 (HEAD -> master)
Author: Craig de Stigter <[email protected]>
Date:   Tue Apr 7 13:55:50 2020 +1200

    Import from manawatu-whanganui-palmerston-north-lidar-index-tiles-2018.gpkg to /manawatu_whanganui_palmerston_north_lidar_index_tiles_2018/

[craigds]

the linked PR doesn't actually quite fix this yet - we still need to resolve X^ to the empty-tree ref everywhere, when X refers to the first commit.

[olsen232]

X^ still doesn't refer to the empty tree everywhere - git doesn't actually do this either. Not sure if it's a good behaviour to implement or not.

But, git show <initial_commit> now shows the initial commit including a diff <empty_tree>..<initial_commit>. So that part works

[craigds]

👍 fixed via 222f1ce