At work, I sometimes fail to create git commits. For example:

$ git commit
error: gpg failed to sign the data
fatal: failed to write commit object

Despite appearances, your carefully crafted commit message has not been lost. You can find it in the .git folder in the root of the repository:

Recovering failing git commit message
# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Your branch is up to date with 'origin/master'.
# Changes to be committed:
#	new file:   content/post/

You can then copy the message and run the commit again:

$ git commit -m "Recovering failing git commit message"
[master 9be38ac] Recovering failing git commit message
 1 file changed, 37 insertions(+)
 create mode 100644 content/post/