[PATCHv2 08/21] completion: fix most spots not respecting 'git --git-dir='

[SZEDER Gábor]

The completion script already respects the path to the repository
specified on the command line most of the time, here we add the
necessary '--git-dir=$(__gitdir)' options to most of the places where
git was executed without it.  The exceptions where said option is not
added are the git invocations:

  - in __git_refs() which are non-trivial and will be the subject of
    the following patch,

  - getting the list of git commands, merge strategies and archive
    formats, because these are independent from the repository and
    thus don't need it, and

  - the 'git rev-parse --git-dir' in __gitdir() itself.

Signed-off-by: SZEDER Gábor <szeder....@gmail.com>
---
 contrib/completion/git-completion.bash | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 5b2bd6721..295f6de24 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -283,11 +283,13 @@ __gitcomp_file ()
 # argument, and using the options specified in the second argument.
 __git_ls_files_helper ()
 {
+       local dir="$(__gitdir)"
+
        if [ "$2" == "--committable" ]; then
-               git -C "$1" diff-index --name-only --relative HEAD
+               git --git-dir="$dir" -C "$1" diff-index --name-only --relative 
HEAD
        else
                # NOTE: $2 is not quoted in order to support multiple options
-               git -C "$1" ls-files --exclude-standard $2
+               git --git-dir="$dir" -C "$1" ls-files --exclude-standard $2
        fi 2>/dev/null
 }
 
@@ -408,7 +410,7 @@ __git_refs2 ()
 __git_refs_remotes ()
 {
        local i hash
-       git ls-remote "$1" 'refs/heads/*' 2>/dev/null | \
+       git --git-dir="$(__gitdir)" ls-remote "$1" 'refs/heads/*' 2>/dev/null | 
\
        while read -r hash i; do
                echo "$i:refs/remotes/$1/${i#refs/heads/}"
        done
@@ -1186,7 +1188,7 @@ _git_commit ()
                return
        esac
 
-       if git rev-parse --verify --quiet HEAD >/dev/null; then
+       if git --git-dir="$(__gitdir)" rev-parse --verify --quiet HEAD 
>/dev/null; then
                __git_complete_index_file "--committable"
        else
                # This is the first commit
@@ -1486,7 +1488,7 @@ _git_log ()
 {
        __git_has_doubledash && return
 
-       local g="$(git rev-parse --git-dir 2>/dev/null)"
+       local g="$(__gitdir)"
        local merge=""
        if [ -f "$g/MERGE_HEAD" ]; then
                merge="--merge"
-- 
2.11.0.555.g967c1bcb3