Below are some git commands which can be useful to resolve problems with submodules.
Submodules are identified by SHA-1 hashes so you may need to get a list of them. Do the following inside the submodule folder (or inside the separate submodule repository):
$ git log --oneline 5bd722f commit 5 b5c1524 commit 4 2444bfa commit 3 e0eadd5 commit 2 c180c5a commit 1 702fc8a commit 0
$ git submodule status 5bd722fa26dcdd64128392aa28e08849fe37f111 sub (heads/master)
Assume we are on the "branch1" and want to compare 'sub' submodule state with master:
$ git diff master -- sub diff --git a/sub b/sub index 702fc8a..5bd722f 160000 --- a/sub +++ b/sub @@ -1 +1 @@ -Subproject commit 702fc8a7edcdf5ceba9929958bd6cd7f000eb369 +Subproject commit 5bd722fa26dcdd64128392aa28e08849fe37f111
Where "-Subproject commit" is another (master) branch state and "+Subproject commit" is a current branch state. VIEW CHANGES TO SUBMODULE STATE ON THE CURRENT BRANCH What we do is show a git log with diffs for submodule (named 'sub' in this case):
$ git log -p sub commit 261aa4bdb6944c77fc98e52748d656e56969ba6a Author: name Date: Thu Sep 13 15:20:48 2012 +0300 accidental sub switch to commit 5 diff --git a/sub b/sub index b5c1524..5bd722f 160000 --- a/sub +++ b/sub @@ -1 +1 @@ -Subproject commit b5c15241fe40f122d5225e5c76457802de3ad605 +Subproject commit 5bd722fa26dcdd64128392aa28e08849fe37f111 commit 073aaf160706d705c6c95ab21327388cd6683486 Author: name Date: Thu Sep 13 14:58:41 2012 +0300 sub commit 4 diff --git a/sub b/sub index 2444bfa..b5c1524 160000 --- a/sub +++ b/sub @@ -1 +1 @@ -Subproject commit 2444bfa760b5d3cc974658bd18482f9679f52b69 +Subproject commit b5c15241fe40f122d5225e5c76457802de3ad605 ...
Where "-Subproject commit" is a previous submodule state and "+Subproject commit" is a new submodule state.