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[PATCH] __git_ps1: Don't kill shell if user types `set -e`

If a user types `set -e` in an interactive shell, and is using __git_ps1
to set
their prompt, the shell will die if the current directory isn't inside a git

This is because `set -e` instructs the shell to exit upon a command
returning a non-zero exit status, and the following command exits with
status 128:

	repo_info="$(git rev-parse --git-dir --is-inside-git-dir \
		--is-bare-repository --is-inside-work-tree \
		--short HEAD 2>/dev/null)"

I couldn't write a test to illustrate this - the test harness seems to
be preventing
`set -e` from having an effect.

Signed-off-by: Tom "Ravi" Hale <tom@xxxxxxx>
>From 7867768f4516559c129ed9eb07ae29c36a6c9367 Mon Sep 17 00:00:00 2001
From: "Tom \"Ravi\" Hale" <tom@xxxxxxx>
Date: Sun, 16 Apr 2017 14:10:10 +0700
Subject: [PATCH] __git_ps1: Don't kill shell if user types `set -e`

Ensure that `set +e` is in effect inside __git_ps1 to prevent any commands
exiting non-zero from killing an interactive shell in which the user has run
`set -e`.
 contrib/completion/git-prompt.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/contrib/completion/git-prompt.sh b/contrib/completion/git-prompt.sh
index 97eacd7..15a0b74 100644
--- a/contrib/completion/git-prompt.sh
+++ b/contrib/completion/git-prompt.sh
@@ -304,6 +304,10 @@ __git_ps1 ()
 	local ps1pc_start='\u@\h:\w '
 	local ps1pc_end='\$ '
 	local printf_format=' (%s)'
+	# Prevent any non-zero exit statuses from killing an interactive shell in the
+	# case that a user types `set -e`
+	local -- - # Shadow shell options in $- (restored upon return)
+	set +e
 	case "$#" in
 		2|3)	pcmode=yes