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# This is a shell library to calculate the remote repository and
# upstream branch that should be pulled by "git pull" from the current
# branch.

# git-ls-remote could be called from outside a git managed repository;
# this would fail in that case and would issue an error message.
GIT_DIR=$(git rev-parse -q --git-dir) || :;

get_default_remote () {
curr_branch=$(git symbolic-ref -q HEAD)
curr_branch="${curr_branch#refs/heads/}"
origin=$(git config --get "branch.$curr_branch.remote")
echo ${origin:-origin}
}

get_remote_merge_branch () {
case "$#" in
0|1)
origin="$1"
default=$(get_default_remote)
test -z "$origin" && origin=$default
curr_branch=$(git symbolic-ref -q HEAD) &&
[ "$origin" = "$default" ] &&
echo $(git for-each-ref --format='%(upstream)' $curr_branch)
;;
*)
repo=$1
shift
ref=$1
# FIXME: It should return the tracking branch
# Currently only works with the default mapping
case "$ref" in
+*)
ref=$(expr "z$ref" : 'z+\(.*\)')
;;
esac
expr "z$ref" : 'z.*:' >/dev/null || ref="${ref}:"
remote=$(expr "z$ref" : 'z\([^:]*\):')
case "$remote" in
'' | HEAD ) remote=HEAD ;;
heads/*) remote=${remote#heads/} ;;
refs/heads/*) remote=${remote#refs/heads/} ;;
refs/* | tags/* | remotes/* ) remote=
esac
[ -n "$remote" ] && case "$repo" in
.)
echo "refs/heads/$remote"
;;
*)
echo "refs/remotes/$repo/$remote"
;;
esac
esac
}

error_on_missing_default_upstream () {
cmd="$1"
op_type="$2"
op_prep="$3"
example="$4"
branch_name=$(git symbolic-ref -q HEAD)
# If there's only one remote, use that in the suggestion
remote="<remote>"
if test $(git remote | wc -l) = 1
then
remote=$(git remote)
fi

if test -z "$branch_name"
then
echo "You are not currently on a branch. Please specify which
branch you want to $op_type $op_prep. See git-${cmd}(1) for details.

$example
"
else
echo "There is no tracking information for the current branch.
Please specify which branch you want to $op_type $op_prep.
See git-${cmd}(1) for details

$example

If you wish to set tracking information for this branch you can do so with:

git branch --set-upstream-to=$remote/<branch> ${branch_name#refs/heads/}
"
fi
exit 1
}
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