git/t/t1301-shared-repo.sh
Jeff King b9605bc4f2 config: only read .git/config from configured repos
When git_config() runs, it looks in the system, user-wide,
and repo-level config files. It gets the latter by calling
git_pathdup(), which in turn calls get_git_dir(). If we
haven't set up the git repository yet, this may simply
return ".git", and we will look at ".git/config".  This
seems like it would be helpful (presumably we haven't set up
the repository yet, so it tries to find it), but it turns
out to be a bad idea for a few reasons:

  - it's not sufficient, and therefore hides bugs in a
    confusing way. Config will be respected if commands are
    run from the top-level of the working tree, but not from
    a subdirectory.

  - it's not always true that we haven't set up the
    repository _yet_; we may not want to do it at all. For
    instance, if you run "git init /some/path" from inside
    another repository, it should not load config from the
    existing repository.

  - there might be a path ".git/config", but it is not the
    actual repository we would find via setup_git_directory().
    This may happen, e.g., if you are storing a git
    repository inside another git repository, but have
    munged one of the files in such a way that the
    inner repository is not valid (e.g., by removing HEAD).

We have at least two bugs of the second type in git-init,
introduced by ae5f677 (lazily load core.sharedrepository,
2016-03-11). It causes init to use git_configset(), which
loads all of the config, including values from the current
repo (if any).  This shows up in two ways:

  1. If we happen to be in an existing repository directory,
     we'll read and respect core.sharedrepository from it,
     even though it should have no bearing on the new
     repository. A new test in t1301 covers this.

  2. Similarly, if we're in an existing repo that sets
     core.logallrefupdates, that will cause init to fail to
     set it in a newly created repository (because it thinks
     that the user's templates already did so). A new test
     in t0001 covers this.

We also need to adjust an existing test in t1302, which
gives another example of why this patch is an improvement.

That test creates an embedded repository with a bogus
core.repositoryformatversion of "99". It wants to make sure
that we actually stop at the bogus repo rather than
continuing upward to find the outer repo. So it checks that
"git config core.repositoryformatversion" returns 99. But
that only works because we blindly read ".git/config", even
though we _know_ we're in a repository whose vintage we do
not understand.

After this patch, we avoid reading config from the unknown
vintage repository at all, which is a safer choice.  But we
need to tweak the test, since core.repositoryformatversion
will not return 99; it will claim that it could not find the
variable at all.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-09-13 15:45:45 -07:00

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#!/bin/sh
#
# Copyright (c) 2007 Johannes Schindelin
#
test_description='Test shared repository initialization'
. ./test-lib.sh
# Remove a default ACL from the test dir if possible.
setfacl -k . 2>/dev/null
# User must have read permissions to the repo -> failure on --shared=0400
test_expect_success 'shared = 0400 (faulty permission u-w)' '
test_when_finished "rm -rf sub" &&
mkdir sub && (
cd sub &&
test_must_fail git init --shared=0400
)
'
modebits () {
ls -l "$1" | sed -e 's|^\(..........\).*|\1|'
}
for u in 002 022
do
test_expect_success POSIXPERM "shared=1 does not clear bits preset by umask $u" '
mkdir sub && (
cd sub &&
umask $u &&
git init --shared=1 &&
test 1 = "$(git config core.sharedrepository)"
) &&
actual=$(ls -l sub/.git/HEAD) &&
case "$actual" in
-rw-rw-r--*)
: happy
;;
*)
echo Oops, .git/HEAD is not 0664 but $actual
false
;;
esac
'
rm -rf sub
done
test_expect_success 'shared=all' '
mkdir sub &&
cd sub &&
git init --shared=all &&
test 2 = $(git config core.sharedrepository)
'
test_expect_success POSIXPERM 'update-server-info honors core.sharedRepository' '
: > a1 &&
git add a1 &&
test_tick &&
git commit -m a1 &&
umask 0277 &&
git update-server-info &&
actual="$(ls -l .git/info/refs)" &&
case "$actual" in
-r--r--r--*)
: happy
;;
*)
echo Oops, .git/info/refs is not 0444
false
;;
esac
'
for u in 0660:rw-rw---- \
0640:rw-r----- \
0600:rw------- \
0666:rw-rw-rw- \
0664:rw-rw-r--
do
x=$(expr "$u" : ".*:\([rw-]*\)") &&
y=$(echo "$x" | sed -e "s/w/-/g") &&
u=$(expr "$u" : "\([0-7]*\)") &&
git config core.sharedrepository "$u" &&
umask 0277 &&
test_expect_success POSIXPERM "shared = $u ($y) ro" '
rm -f .git/info/refs &&
git update-server-info &&
actual="$(modebits .git/info/refs)" &&
verbose test "x$actual" = "x-$y"
'
umask 077 &&
test_expect_success POSIXPERM "shared = $u ($x) rw" '
rm -f .git/info/refs &&
git update-server-info &&
actual="$(modebits .git/info/refs)" &&
verbose test "x$actual" = "x-$x"
'
done
test_expect_success POSIXPERM 'info/refs respects umask in unshared repo' '
rm -f .git/info/refs &&
test_unconfig core.sharedrepository &&
umask 002 &&
git update-server-info &&
echo "-rw-rw-r--" >expect &&
modebits .git/info/refs >actual &&
test_cmp expect actual
'
test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
umask 077 &&
git config core.sharedRepository group &&
git reflog expire --all &&
actual="$(ls -l .git/logs/refs/heads/master)" &&
case "$actual" in
-rw-rw-*)
: happy
;;
*)
echo Ooops, .git/logs/refs/heads/master is not 0662 [$actual]
false
;;
esac
'
test_expect_success POSIXPERM 'forced modes' '
mkdir -p templates/hooks &&
echo update-server-info >templates/hooks/post-update &&
chmod +x templates/hooks/post-update &&
echo : >random-file &&
mkdir new &&
(
cd new &&
umask 002 &&
git init --shared=0660 --template=../templates &&
>frotz &&
git add frotz &&
git commit -a -m initial &&
git repack
) &&
# List repository files meant to be protected; note that
# COMMIT_EDITMSG does not matter---0mode is not about a
# repository with a work tree.
find new/.git -type f -name COMMIT_EDITMSG -prune -o -print |
xargs ls -ld >actual &&
# Everything must be unaccessible to others
test -z "$(sed -e "/^.......---/d" actual)" &&
# All directories must have either 2770 or 770
test -z "$(sed -n -e "/^drwxrw[sx]---/d" -e "/^d/p" actual)" &&
# post-update hook must be 0770
test -z "$(sed -n -e "/post-update/{
/^-rwxrwx---/d
p
}" actual)" &&
# All files inside objects must be accessible by us
test -z "$(sed -n -e "/objects\//{
/^d/d
/^-r.-r.----/d
p
}" actual)"
'
test_expect_success POSIXPERM 'remote init does not use config from cwd' '
git config core.sharedrepository 0666 &&
umask 0022 &&
git init --bare child.git &&
echo "-rw-r--r--" >expect &&
modebits child.git/config >actual &&
test_cmp expect actual
'
test_done