git/git-sh-setup.sh
Junio C Hamano e2eb527345 require-work-tree wants more than what its name says
Somebody tried "git pull" from a random place completely outside the work
tree, while exporting GIT_DIR and GIT_WORK_TREE that are set to correct
places, e.g.

    GIT_WORK_TREE=$HOME/git.git
    GIT_DIR=$GIT_WORK_TREE/.git
    export GIT_WORK_TREE GIT_DIR
    cd /tmp
    git pull

At the beginning of git-pull, we check "require-work-tree" and then
"cd-to-toplevel".  I _think_ the original intention when I wrote the
command was "we MUST have a work tree, our $(cwd) might not be at the
top-level directory of it", and no stronger than that.  That check is a
very sensible thing to do before doing cd-to-toplevel.  We check that the
place we would want to go exists, and then go there.

But the implementation of require_work_tree we have today is quite
different.  I don't have energy to dig the history, but currently it says:

    test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
    die "fatal: $0 cannot be used without a working tree."

Which is completely bogus.  Even though we may happen to be just outside
of it right now, we may have a working tree that we can cd_to_toplevel
back to.

Add a function "require_work_tree_exists" that implements the check
this function originally intended (this is so that third-party scripts
that rely on the current behaviour do not have to get broken).

For now, update _no_ in-tree scripts, not even "git pull", as nobody on
the list seems to really care about the above corner case workflow that
triggered this. Scripts can be updated after vetting that they do want the
"we want to make sure the place we are going to go actually exists"
semantics.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-05-24 11:34:40 -07:00

262 lines
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#!/bin/sh
#
# This is included in commands that either have to be run from the toplevel
# of the repository, or with GIT_DIR environment variable properly.
# If the GIT_DIR does not look like the right correct git-repository,
# it dies.
# Having this variable in your environment would break scripts because
# you would cause "cd" to be taken to unexpected places. If you
# like CDPATH, define it for your interactive shell sessions without
# exporting it.
unset CDPATH
git_broken_path_fix () {
case ":$PATH:" in
*:$1:*) : ok ;;
*)
PATH=$(
SANE_TOOL_PATH="$1"
IFS=: path= sep=
set x $PATH
shift
for elem
do
case "$SANE_TOOL_PATH:$elem" in
(?*:/bin | ?*:/usr/bin)
path="$path$sep$SANE_TOOL_PATH"
sep=:
SANE_TOOL_PATH=
esac
path="$path$sep$elem"
sep=:
done
echo "$path"
)
;;
esac
}
# @@BROKEN_PATH_FIX@@
die() {
echo >&2 "$@"
exit 1
}
GIT_QUIET=
say () {
if test -z "$GIT_QUIET"
then
printf '%s\n' "$*"
fi
}
if test -n "$OPTIONS_SPEC"; then
usage() {
"$0" -h
exit 1
}
parseopt_extra=
[ -n "$OPTIONS_KEEPDASHDASH" ] &&
parseopt_extra="--keep-dashdash"
eval "$(
echo "$OPTIONS_SPEC" |
git rev-parse --parseopt $parseopt_extra -- "$@" ||
echo exit $?
)"
else
dashless=$(basename "$0" | sed -e 's/-/ /')
usage() {
die "Usage: $dashless $USAGE"
}
if [ -z "$LONG_USAGE" ]
then
LONG_USAGE="Usage: $dashless $USAGE"
else
LONG_USAGE="Usage: $dashless $USAGE
$LONG_USAGE"
fi
case "$1" in
-h|--h|--he|--hel|--help)
echo "$LONG_USAGE"
exit
esac
fi
set_reflog_action() {
if [ -z "${GIT_REFLOG_ACTION:+set}" ]
then
GIT_REFLOG_ACTION="$*"
export GIT_REFLOG_ACTION
fi
}
git_editor() {
if test -z "${GIT_EDITOR:+set}"
then
GIT_EDITOR="$(git var GIT_EDITOR)" || return $?
fi
eval "$GIT_EDITOR" '"$@"'
}
git_pager() {
if test -t 1
then
GIT_PAGER=$(git var GIT_PAGER)
else
GIT_PAGER=cat
fi
: ${LESS=-FRSX}
export LESS
eval "$GIT_PAGER" '"$@"'
}
sane_grep () {
GREP_OPTIONS= LC_ALL=C grep "$@"
}
sane_egrep () {
GREP_OPTIONS= LC_ALL=C egrep "$@"
}
is_bare_repository () {
git rev-parse --is-bare-repository
}
cd_to_toplevel () {
cdup=$(git rev-parse --show-toplevel) &&
cd "$cdup" || {
echo >&2 "Cannot chdir to $cdup, the toplevel of the working tree"
exit 1
}
}
require_work_tree_exists () {
if test "z$(git rev-parse --is-bare-repository)" != zfalse
then
die "fatal: $0 cannot be used without a working tree."
fi
}
require_work_tree () {
test "$(git rev-parse --is-inside-work-tree 2>/dev/null)" = true ||
die "fatal: $0 cannot be used without a working tree."
}
require_clean_work_tree () {
git rev-parse --verify HEAD >/dev/null || exit 1
git update-index -q --ignore-submodules --refresh
err=0
if ! git diff-files --quiet --ignore-submodules
then
echo >&2 "Cannot $1: You have unstaged changes."
err=1
fi
if ! git diff-index --cached --quiet --ignore-submodules HEAD --
then
if [ $err = 0 ]
then
echo >&2 "Cannot $1: Your index contains uncommitted changes."
else
echo >&2 "Additionally, your index contains uncommitted changes."
fi
err=1
fi
if [ $err = 1 ]
then
test -n "$2" && echo >&2 "$2"
exit 1
fi
}
get_author_ident_from_commit () {
pick_author_script='
/^author /{
s/'\''/'\''\\'\'\''/g
h
s/^author \([^<]*\) <[^>]*> .*$/\1/
s/.*/GIT_AUTHOR_NAME='\''&'\''/p
g
s/^author [^<]* <\([^>]*\)> .*$/\1/
s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
g
s/^author [^<]* <[^>]*> \(.*\)$/\1/
s/.*/GIT_AUTHOR_DATE='\''&'\''/p
q
}
'
encoding=$(git config i18n.commitencoding || echo UTF-8)
git show -s --pretty=raw --encoding="$encoding" "$1" -- |
LANG=C LC_ALL=C sed -ne "$pick_author_script"
}
# Clear repo-local GIT_* environment variables. Useful when switching to
# another repository (e.g. when entering a submodule). See also the env
# list in git_connect()
clear_local_git_env() {
unset $(git rev-parse --local-env-vars)
}
# Make sure we are in a valid repository of a vintage we understand,
# if we require to be in a git repository.
if test -z "$NONGIT_OK"
then
GIT_DIR=$(git rev-parse --git-dir) || exit
if [ -z "$SUBDIRECTORY_OK" ]
then
test -z "$(git rev-parse --show-cdup)" || {
exit=$?
echo >&2 "You need to run this command from the toplevel of the working tree."
exit $exit
}
fi
test -n "$GIT_DIR" && GIT_DIR=$(cd "$GIT_DIR" && pwd) || {
echo >&2 "Unable to determine absolute path of git directory"
exit 1
}
: ${GIT_OBJECT_DIRECTORY="$GIT_DIR/objects"}
fi
# Fix some commands on Windows
case $(uname -s) in
*MINGW*)
# Windows has its own (incompatible) sort and find
sort () {
/usr/bin/sort "$@"
}
find () {
/usr/bin/find "$@"
}
is_absolute_path () {
case "$1" in
[/\\]* | [A-Za-z]:*)
return 0 ;;
esac
return 1
}
;;
*)
is_absolute_path () {
case "$1" in
/*)
return 0 ;;
esac
return 1
}
esac