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#!/bin/sh

# 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_data_source () {
case "$1" in
*/*)
echo ''
;;
.)
echo self
;;
*)
if test "$(git config --get "remote.$1.url")"
then
echo config
elif test -f "$GIT_DIR/remotes/$1"
then
echo remotes
elif test -f "$GIT_DIR/branches/$1"
then
echo branches
else
echo ''
fi ;;
esac
}

get_remote_url () {
data_source=$(get_data_source "$1")
case "$data_source" in
'')
echo "$1"
;;
self)
echo "$1"
;;
config)
git config --get "remote.$1.url"
;;
remotes)
sed -ne '/^URL: */{
s///p
q
}' "$GIT_DIR/remotes/$1"
;;
branches)
sed -e 's/#.*//' "$GIT_DIR/branches/$1"
;;
*)
die "internal error: get-remote-url $1" ;;
esac
}

get_default_remote () {
curr_branch=$(git symbolic-ref -q HEAD | sed -e 's|^refs/heads/||')
origin=$(git config --get "branch.$curr_branch.remote")
echo ${origin:-origin}
}

get_remote_default_refs_for_push () {
data_source=$(get_data_source "$1")
case "$data_source" in
'' | branches | self)
;; # no default push mapping, just send matching refs.
config)
git config --get-all "remote.$1.push" ;;
remotes)
sed -ne '/^Push: */{
s///p
}' "$GIT_DIR/remotes/$1" ;;
*)
die "internal error: get-remote-default-ref-for-push $1" ;;
esac
}

# Called from canon_refs_list_for_fetch -d "$remote", which
# is called from get_remote_default_refs_for_fetch to grok
# refspecs that are retrieved from the configuration, but not
# from get_remote_refs_for_fetch when it deals with refspecs
# supplied on the command line. $ls_remote_result has the list
# of refs available at remote.
#
# The first token returned is either "explicit" or "glob"; this
# is to help prevent randomly "globbed" ref from being chosen as
# a merge candidate
expand_refs_wildcard () {
echo "$ls_remote_result" |
git fetch--tool expand-refs-wildcard "-" "$@"
}

# Subroutine to canonicalize remote:local notation.
canon_refs_list_for_fetch () {
# If called from get_remote_default_refs_for_fetch
# leave the branches in branch.${curr_branch}.merge alone,
# or the first one otherwise; add prefix . to the rest
# to prevent the secondary branches to be merged by default.
merge_branches=
curr_branch=
if test "$1" = "-d"
then
shift ; remote="$1" ; shift
set $(expand_refs_wildcard "$remote" "$@")
is_explicit="$1"
shift
if test "$remote" = "$(get_default_remote)"
then
curr_branch=$(git symbolic-ref -q HEAD | \
sed -e 's|^refs/heads/||')
merge_branches=$(git config \
--get-all "branch.${curr_branch}.merge")
fi
if test -z "$merge_branches" && test $is_explicit != explicit
then
merge_branches=..this.will.never.match.any.ref..
fi
fi
for ref
do
force=
case "$ref" in
+*)
ref=$(expr "z$ref" : 'z+\(.*\)')
force=+
;;
esac
expr "z$ref" : 'z.*:' >/dev/null || ref="${ref}:"
remote=$(expr "z$ref" : 'z\([^:]*\):')
local=$(expr "z$ref" : 'z[^:]*:\(.*\)')
dot_prefix=.
if test -z "$merge_branches"
then
merge_branches=$remote
dot_prefix=
else
for merge_branch in $merge_branches
do
[ "$remote" = "$merge_branch" ] &&
dot_prefix= && break
done
fi
case "$remote" in
'' | HEAD ) remote=HEAD ;;
refs/*) ;;
heads/* | tags/* | remotes/* ) remote="refs/$remote" ;;
*) remote="refs/heads/$remote" ;;
esac
case "$local" in
'') local= ;;
refs/*) ;;
heads/* | tags/* | remotes/* ) local="refs/$local" ;;
*) local="refs/heads/$local" ;;
esac

if local_ref_name=$(expr "z$local" : 'zrefs/\(.*\)')
then
git check-ref-format "$local_ref_name" ||
die "* refusing to create funny ref '$local_ref_name' locally"
fi
echo "${dot_prefix}${force}${remote}:${local}"
done
}

# Returns list of src: (no store), or src:dst (store)
get_remote_default_refs_for_fetch () {
data_source=$(get_data_source "$1")
case "$data_source" in
'')
echo "HEAD:" ;;
self)
canon_refs_list_for_fetch -d "$1" \
$(git for-each-ref --format='%(refname):')
;;
config)
canon_refs_list_for_fetch -d "$1" \
$(git config --get-all "remote.$1.fetch") ;;
branches)
remote_branch=$(sed -ne '/#/s/.*#//p' "$GIT_DIR/branches/$1")
case "$remote_branch" in '') remote_branch=master ;; esac
echo "refs/heads/${remote_branch}:refs/heads/$1"
;;
remotes)
canon_refs_list_for_fetch -d "$1" $(sed -ne '/^Pull: */{
s///p
}' "$GIT_DIR/remotes/$1")
;;
*)
die "internal error: get-remote-default-ref-for-fetch $1" ;;
esac
}

get_remote_refs_for_push () {
case "$#" in
0) die "internal error: get-remote-refs-for-push." ;;
1) get_remote_default_refs_for_push "$@" ;;
*) shift; echo "$@" ;;
esac
}

get_remote_refs_for_fetch () {
case "$#" in
0)
die "internal error: get-remote-refs-for-fetch." ;;
1)
get_remote_default_refs_for_fetch "$@" ;;
*)
shift
tag_just_seen=
for ref
do
if test "$tag_just_seen"
then
echo "refs/tags/${ref}:refs/tags/${ref}"
tag_just_seen=
continue
else
case "$ref" in
tag)
tag_just_seen=yes
continue
;;
esac
fi
canon_refs_list_for_fetch "$ref"
done
;;
esac
}

resolve_alternates () {
# original URL (xxx.git)
top_=`expr "z$1" : 'z\([^:]*:/*[^/]*\)/'`
while read path
do
case "$path" in
\#* | '')
continue ;;
/*)
echo "$top_$path/" ;;
../*)
# relative -- ugly but seems to work.
echo "$1/objects/$path/" ;;
*)
# exit code may not be caught by the reader.
echo "bad alternate: $path"
exit 1 ;;
esac
done
}

get_uploadpack () {
data_source=$(get_data_source "$1")
case "$data_source" in
config)
uplp=$(git config --get "remote.$1.uploadpack")
echo ${uplp:-git-upload-pack}
;;
*)
echo "git-upload-pack"
;;
esac
}
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