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git/t/t0008-ignores.sh
Jeff King 4783e7ea83 t0008: avoid SIGPIPE race condition on fifo 
To test check-ignore's --stdin feature, we use two fifos to
send and receive data. We carefully keep a descriptor to its
input open so that it does not receive EOF between input
lines. However, we do not do the same for its output. That
means there is a potential race condition in which
check-ignore has opened the output pipe once (when we read
the first line), and then writes the second line before we
have re-opened the pipe.

In that case, check-ignore gets a SIGPIPE and dies. The
outer shell then tries to open the output fifo but blocks
indefinitely, because there is no writer.  We can fix it by
keeping a descriptor open through the whole procedure.

This should also help if check-ignore dies for any other
reason (we would already have opened the fifo and would
therefore not block, but just get EOF on read).

However, we are technically still susceptible to
check-ignore dying early, before we have opened the fifo.
This is an unlikely race and shouldn't generally happen in
practice, though, so we can hopefully ignore it.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-12 09:24:29 -07:00

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#!/bin/sh
test_description=check-ignore
. ./test-lib.sh
init_vars () {
global_excludes="$(pwd)/global-excludes"
}
enable_global_excludes () {
init_vars &&
git config core.excludesfile "$global_excludes"
}
expect_in () {
dest="$HOME/expected-$1" text="$2"
if test -z "$text"
then
>"$dest" # avoid newline
else
echo "$text" >"$dest"
fi
}
expect () {
expect_in stdout "$1"
}
expect_from_stdin () {
cat >"$HOME/expected-stdout"
}
test_stderr () {
expected="$1"
expect_in stderr "$1" &&
test_cmp "$HOME/expected-stderr" "$HOME/stderr"
}
stderr_contains () {
regexp="$1"
if grep "$regexp" "$HOME/stderr"
then
return 0
else
echo "didn't find /$regexp/ in $HOME/stderr"
cat "$HOME/stderr"
return 1
fi
}
stderr_empty_on_success () {
expect_code="$1"
if test $expect_code = 0
then
test_stderr ""
else
# If we expect failure then stderr might or might not be empty
# due to --quiet - the caller can check its contents
return 0
fi
}
test_check_ignore () {
args="$1" expect_code="${2:-0}" global_args="$3"
init_vars &&
rm -f "$HOME/stdout" "$HOME/stderr" "$HOME/cmd" &&
echo git $global_args check-ignore $quiet_opt $verbose_opt $non_matching_opt $args \
>"$HOME/cmd" &&
echo "$expect_code" >"$HOME/expected-exit-code" &&
test_expect_code "$expect_code" \
git $global_args check-ignore $quiet_opt $verbose_opt $non_matching_opt $args \
>"$HOME/stdout" 2>"$HOME/stderr" &&
test_cmp "$HOME/expected-stdout" "$HOME/stdout" &&
stderr_empty_on_success "$expect_code"
}
# Runs the same code with 4 different levels of output verbosity:
#
# 1. with -q / --quiet
# 2. with default verbosity
# 3. with -v / --verbose
# 4. with -v / --verbose, *and* -n / --non-matching
#
# expecting success each time. Takes advantage of the fact that
# check-ignore --verbose output is the same as normal output except
# for the extra first column.
#
# Arguments:
# - (optional) prereqs for this test, e.g. 'SYMLINKS'
# - test name
# - output to expect from the fourth verbosity mode (the output
# from the other verbosity modes is automatically inferred
# from this value)
# - code to run (should invoke test_check_ignore)
test_expect_success_multi () {
prereq=
if test $# -eq 4
then
prereq=$1
shift
fi
testname="$1" expect_all="$2" code="$3"
expect_verbose=$( echo "$expect_all" | grep -v '^:: ' )
expect=$( echo "$expect_verbose" | sed -e 's/.* //' )
test_expect_success $prereq "$testname" '
expect "$expect" &&
eval "$code"
'
# --quiet is only valid when a single pattern is passed
if test $( echo "$expect_all" | wc -l ) = 1
then
for quiet_opt in '-q' '--quiet'
do
test_expect_success $prereq "$testname${quiet_opt:+ with $quiet_opt}" "
expect '' &&
$code
"
done
quiet_opt=
fi
for verbose_opt in '-v' '--verbose'
do
for non_matching_opt in '' ' -n' ' --non-matching'
do
if test -n "$non_matching_opt"
then
my_expect="$expect_all"
else
my_expect="$expect_verbose"
fi
test_code="
expect '$my_expect' &&
$code
"
opts="$verbose_opt$non_matching_opt"
test_expect_success $prereq "$testname${opts:+ with $opts}" "$test_code"
done
done
verbose_opt=
non_matching_opt=
}
test_expect_success 'setup' '
init_vars &&
mkdir -p a/b/ignored-dir a/submodule b &&
if test_have_prereq SYMLINKS
then
ln -s b a/symlink
fi &&
(
cd a/submodule &&
git init &&
echo a >a &&
git add a &&
git commit -m"commit in submodule"
) &&
git add a/submodule &&
cat <<-\EOF >.gitignore &&
one
ignored-*
top-level-dir/
EOF
for dir in . a
do
: >$dir/not-ignored &&
: >$dir/ignored-and-untracked &&
: >$dir/ignored-but-in-index
done &&
git add -f ignored-but-in-index a/ignored-but-in-index &&
cat <<-\EOF >a/.gitignore &&
two*
*three
EOF
cat <<-\EOF >a/b/.gitignore &&
four
five
# this comment should affect the line numbers
six
ignored-dir/
# and so should this blank line:
!on*
!two
EOF
echo "seven" >a/b/ignored-dir/.gitignore &&
test -n "$HOME" &&
cat <<-\EOF >"$global_excludes" &&
globalone
!globaltwo
globalthree
EOF
cat <<-\EOF >>.git/info/exclude
per-repo
EOF
'
############################################################################
#
# test invalid inputs
test_expect_success_multi '. corner-case' ':: .' '
test_check_ignore . 1
'
test_expect_success_multi 'empty command line' '' '
test_check_ignore "" 128 &&
stderr_contains "fatal: no path specified"
'
test_expect_success_multi '--stdin with empty STDIN' '' '
test_check_ignore "--stdin" 1 </dev/null &&
test_stderr ""
'
test_expect_success '-q with multiple args' '
expect "" &&
test_check_ignore "-q one two" 128 &&
stderr_contains "fatal: --quiet is only valid with a single pathname"
'
test_expect_success '--quiet with multiple args' '
expect "" &&
test_check_ignore "--quiet one two" 128 &&
stderr_contains "fatal: --quiet is only valid with a single pathname"
'
for verbose_opt in '-v' '--verbose'
do
for quiet_opt in '-q' '--quiet'
do
test_expect_success "$quiet_opt $verbose_opt" "
expect '' &&
test_check_ignore '$quiet_opt $verbose_opt foo' 128 &&
stderr_contains 'fatal: cannot have both --quiet and --verbose'
"
done
done
test_expect_success '--quiet with multiple args' '
expect "" &&
test_check_ignore "--quiet one two" 128 &&
stderr_contains "fatal: --quiet is only valid with a single pathname"
'
test_expect_success_multi 'erroneous use of --' '' '
test_check_ignore "--" 128 &&
stderr_contains "fatal: no path specified"
'
test_expect_success_multi '--stdin with superfluous arg' '' '
test_check_ignore "--stdin foo" 128 &&
stderr_contains "fatal: cannot specify pathnames with --stdin"
'
test_expect_success_multi '--stdin -z with superfluous arg' '' '
test_check_ignore "--stdin -z foo" 128 &&
stderr_contains "fatal: cannot specify pathnames with --stdin"
'
test_expect_success_multi '-z without --stdin' '' '
test_check_ignore "-z" 128 &&
stderr_contains "fatal: -z only makes sense with --stdin"
'
test_expect_success_multi '-z without --stdin and superfluous arg' '' '
test_check_ignore "-z foo" 128 &&
stderr_contains "fatal: -z only makes sense with --stdin"
'
test_expect_success_multi 'needs work tree' '' '
(
cd .git &&
test_check_ignore "foo" 128
) &&
stderr_contains "fatal: This operation must be run in a work tree"
'
############################################################################
#
# test standard ignores
# First make sure that the presence of a file in the working tree
# does not impact results, but that the presence of a file in the
# index does.
for subdir in '' 'a/'
do
if test -z "$subdir"
then
where="at top-level"
else
where="in subdir $subdir"
fi
test_expect_success_multi "non-existent file $where not ignored" \
":: ${subdir}non-existent" \
"test_check_ignore '${subdir}non-existent' 1"
test_expect_success_multi "non-existent file $where ignored" \
".gitignore:1:one ${subdir}one" \
"test_check_ignore '${subdir}one'"
test_expect_success_multi "existing untracked file $where not ignored" \
":: ${subdir}not-ignored" \
"test_check_ignore '${subdir}not-ignored' 1"
test_expect_success_multi "existing tracked file $where not ignored" \
":: ${subdir}ignored-but-in-index" \
"test_check_ignore '${subdir}ignored-but-in-index' 1"
test_expect_success_multi "existing untracked file $where ignored" \
".gitignore:2:ignored-* ${subdir}ignored-and-untracked" \
"test_check_ignore '${subdir}ignored-and-untracked'"
test_expect_success_multi "mix of file types $where" \
":: ${subdir}non-existent
.gitignore:1:one ${subdir}one
:: ${subdir}not-ignored
:: ${subdir}ignored-but-in-index
.gitignore:2:ignored-* ${subdir}ignored-and-untracked" \
"test_check_ignore '
${subdir}non-existent
${subdir}one
${subdir}not-ignored
${subdir}ignored-but-in-index
${subdir}ignored-and-untracked'
"
done
# Having established the above, from now on we mostly test against
# files which do not exist in the working tree or index.
test_expect_success 'sub-directory local ignore' '
expect "a/3-three" &&
test_check_ignore "a/3-three a/three-not-this-one"
'
test_expect_success 'sub-directory local ignore with --verbose' '
expect "a/.gitignore:2:*three a/3-three" &&
test_check_ignore "--verbose a/3-three a/three-not-this-one"
'
test_expect_success 'local ignore inside a sub-directory' '
expect "3-three" &&
(
cd a &&
test_check_ignore "3-three three-not-this-one"
)
'
test_expect_success 'local ignore inside a sub-directory with --verbose' '
expect "a/.gitignore:2:*three 3-three" &&
(
cd a &&
test_check_ignore "--verbose 3-three three-not-this-one"
)
'
test_expect_success_multi 'nested include' \
'a/b/.gitignore:8:!on* a/b/one' '
test_check_ignore "a/b/one"
'
############################################################################
#
# test ignored sub-directories
test_expect_success_multi 'ignored sub-directory' \
'a/b/.gitignore:5:ignored-dir/ a/b/ignored-dir' '
test_check_ignore "a/b/ignored-dir"
'
test_expect_success 'multiple files inside ignored sub-directory' '
expect_from_stdin <<-\EOF &&
a/b/ignored-dir/foo
a/b/ignored-dir/twoooo
a/b/ignored-dir/seven
EOF
test_check_ignore "a/b/ignored-dir/foo a/b/ignored-dir/twoooo a/b/ignored-dir/seven"
'
test_expect_success 'multiple files inside ignored sub-directory with -v' '
expect_from_stdin <<-\EOF &&
a/b/.gitignore:5:ignored-dir/ a/b/ignored-dir/foo
a/b/.gitignore:5:ignored-dir/ a/b/ignored-dir/twoooo
a/b/.gitignore:5:ignored-dir/ a/b/ignored-dir/seven
EOF
test_check_ignore "-v a/b/ignored-dir/foo a/b/ignored-dir/twoooo a/b/ignored-dir/seven"
'
test_expect_success 'cd to ignored sub-directory' '
expect_from_stdin <<-\EOF &&
foo
twoooo
../one
seven
../../one
EOF
(
cd a/b/ignored-dir &&
test_check_ignore "foo twoooo ../one seven ../../one"
)
'
test_expect_success 'cd to ignored sub-directory with -v' '
expect_from_stdin <<-\EOF &&
a/b/.gitignore:5:ignored-dir/ foo
a/b/.gitignore:5:ignored-dir/ twoooo
a/b/.gitignore:8:!on* ../one
a/b/.gitignore:5:ignored-dir/ seven
.gitignore:1:one ../../one
EOF
(
cd a/b/ignored-dir &&
test_check_ignore "-v foo twoooo ../one seven ../../one"
)
'
############################################################################
#
# test handling of symlinks
test_expect_success_multi SYMLINKS 'symlink' ':: a/symlink' '
test_check_ignore "a/symlink" 1
'
test_expect_success_multi SYMLINKS 'beyond a symlink' '' '
test_check_ignore "a/symlink/foo" 128 &&
test_stderr "fatal: '\''a/symlink/foo'\'' is beyond a symbolic link"
'
test_expect_success_multi SYMLINKS 'beyond a symlink from subdirectory' '' '
(
cd a &&
test_check_ignore "symlink/foo" 128
) &&
test_stderr "fatal: '\''symlink/foo'\'' is beyond a symbolic link"
'
############################################################################
#
# test handling of submodules
test_expect_success_multi 'submodule' '' '
test_check_ignore "a/submodule/one" 128 &&
test_stderr "fatal: Path '\''a/submodule/one'\'' is in submodule '\''a/submodule'\''"
'
test_expect_success_multi 'submodule from subdirectory' '' '
(
cd a &&
test_check_ignore "submodule/one" 128
) &&
test_stderr "fatal: Path '\''a/submodule/one'\'' is in submodule '\''a/submodule'\''"
'
############################################################################
#
# test handling of global ignore files
test_expect_success 'global ignore not yet enabled' '
expect_from_stdin <<-\EOF &&
.git/info/exclude:7:per-repo per-repo
a/.gitignore:2:*three a/globalthree
.git/info/exclude:7:per-repo a/per-repo
EOF
test_check_ignore "-v globalone per-repo a/globalthree a/per-repo not-ignored a/globaltwo"
'
test_expect_success 'global ignore' '
enable_global_excludes &&
expect_from_stdin <<-\EOF &&
globalone
per-repo
globalthree
a/globalthree
a/per-repo
globaltwo
EOF
test_check_ignore "globalone per-repo globalthree a/globalthree a/per-repo not-ignored globaltwo"
'
test_expect_success 'global ignore with -v' '
enable_global_excludes &&
expect_from_stdin <<-EOF &&
$global_excludes:1:globalone globalone
.git/info/exclude:7:per-repo per-repo
$global_excludes:3:globalthree globalthree
a/.gitignore:2:*three a/globalthree
.git/info/exclude:7:per-repo a/per-repo
$global_excludes:2:!globaltwo globaltwo
EOF
test_check_ignore "-v globalone per-repo globalthree a/globalthree a/per-repo not-ignored globaltwo"
'
############################################################################
#
# test --stdin
cat <<-\EOF >stdin
one
not-ignored
a/one
a/not-ignored
a/b/on
a/b/one
a/b/one one
"a/b/one two"
"a/b/one\"three"
a/b/not-ignored
a/b/two
a/b/twooo
globaltwo
a/globaltwo
a/b/globaltwo
b/globaltwo
EOF
cat <<-\EOF >expected-default
one
a/one
a/b/on
a/b/one
a/b/one one
a/b/one two
"a/b/one\"three"
a/b/two
a/b/twooo
globaltwo
a/globaltwo
a/b/globaltwo
b/globaltwo
EOF
cat <<-EOF >expected-verbose
.gitignore:1:one one
.gitignore:1:one a/one
a/b/.gitignore:8:!on* a/b/on
a/b/.gitignore:8:!on* a/b/one
a/b/.gitignore:8:!on* a/b/one one
a/b/.gitignore:8:!on* a/b/one two
a/b/.gitignore:8:!on* "a/b/one\"three"
a/b/.gitignore:9:!two a/b/two
a/.gitignore:1:two* a/b/twooo
$global_excludes:2:!globaltwo globaltwo
$global_excludes:2:!globaltwo a/globaltwo
$global_excludes:2:!globaltwo a/b/globaltwo
$global_excludes:2:!globaltwo b/globaltwo
EOF
sed -e 's/^"//' -e 's/\\//' -e 's/"$//' stdin | \
tr "\n" "\0" >stdin0
sed -e 's/^"//' -e 's/\\//' -e 's/"$//' expected-default | \
tr "\n" "\0" >expected-default0
sed -e 's/ "/ /' -e 's/\\//' -e 's/"$//' expected-verbose | \
tr ":\t\n" "\0" >expected-verbose0
test_expect_success '--stdin' '
expect_from_stdin <expected-default &&
test_check_ignore "--stdin" <stdin
'
test_expect_success '--stdin -q' '
expect "" &&
test_check_ignore "-q --stdin" <stdin
'
test_expect_success '--stdin -v' '
expect_from_stdin <expected-verbose &&
test_check_ignore "-v --stdin" <stdin
'
for opts in '--stdin -z' '-z --stdin'
do
test_expect_success "$opts" "
expect_from_stdin <expected-default0 &&
test_check_ignore '$opts' <stdin0
"
test_expect_success "$opts -q" "
expect "" &&
test_check_ignore '-q $opts' <stdin0
"
test_expect_success "$opts -v" "
expect_from_stdin <expected-verbose0 &&
test_check_ignore '-v $opts' <stdin0
"
done
cat <<-\EOF >stdin
../one
../not-ignored
one
not-ignored
b/on
b/one
b/one one
"b/one two"
"b/one\"three"
b/two
b/not-ignored
b/twooo
../globaltwo
globaltwo
b/globaltwo
../b/globaltwo
c/not-ignored
EOF
# N.B. we deliberately end STDIN with a non-matching pattern in order
# to test that the exit code indicates that one or more of the
# provided paths is ignored - in other words, that it represents an
# aggregation of all the results, not just the final result.
cat <<-EOF >expected-all
.gitignore:1:one ../one
:: ../not-ignored
.gitignore:1:one one
:: not-ignored
a/b/.gitignore:8:!on* b/on
a/b/.gitignore:8:!on* b/one
a/b/.gitignore:8:!on* b/one one
a/b/.gitignore:8:!on* b/one two
a/b/.gitignore:8:!on* "b/one\"three"
a/b/.gitignore:9:!two b/two
:: b/not-ignored
a/.gitignore:1:two* b/twooo
$global_excludes:2:!globaltwo ../globaltwo
$global_excludes:2:!globaltwo globaltwo
$global_excludes:2:!globaltwo b/globaltwo
$global_excludes:2:!globaltwo ../b/globaltwo
:: c/not-ignored
EOF
grep -v '^:: ' expected-all >expected-verbose
sed -e 's/.* //' expected-verbose >expected-default
sed -e 's/^"//' -e 's/\\//' -e 's/"$//' stdin | \
tr "\n" "\0" >stdin0
sed -e 's/^"//' -e 's/\\//' -e 's/"$//' expected-default | \
tr "\n" "\0" >expected-default0
sed -e 's/ "/ /' -e 's/\\//' -e 's/"$//' expected-verbose | \
tr ":\t\n" "\0" >expected-verbose0
test_expect_success '--stdin from subdirectory' '
expect_from_stdin <expected-default &&
(
cd a &&
test_check_ignore "--stdin" <../stdin
)
'
test_expect_success '--stdin from subdirectory with -v' '
expect_from_stdin <expected-verbose &&
(
cd a &&
test_check_ignore "--stdin -v" <../stdin
)
'
test_expect_success '--stdin from subdirectory with -v -n' '
expect_from_stdin <expected-all &&
(
cd a &&
test_check_ignore "--stdin -v -n" <../stdin
)
'
for opts in '--stdin -z' '-z --stdin'
do
test_expect_success "$opts from subdirectory" '
expect_from_stdin <expected-default0 &&
(
cd a &&
test_check_ignore "'"$opts"'" <../stdin0
)
'
test_expect_success "$opts from subdirectory with -v" '
expect_from_stdin <expected-verbose0 &&
(
cd a &&
test_check_ignore "'"$opts"' -v" <../stdin0
)
'
done
test_expect_success PIPE 'streaming support for --stdin' '
mkfifo in out &&
(git check-ignore -n -v --stdin <in >out &) &&
# We cannot just "echo >in" because check-ignore would get EOF
# after echo exited; instead we open the descriptor in our
# shell, and then echo to the fd. We make sure to close it at
# the end, so that the subprocess does get EOF and dies
# properly.
#
# Similarly, we must keep "out" open so that check-ignore does
# not ever get SIGPIPE trying to write to us. Not only would that
# produce incorrect results, but then there would be no writer on the
# other end of the pipe, and we would potentially block forever trying
# to open it.
exec 9>in &&
exec 8<out &&
test_when_finished "exec 9>&-" &&
test_when_finished "exec 8<&-" &&
echo >&9 one &&
read response <&8 &&
echo "$response" | grep "^\.gitignore:1:one one" &&
echo >&9 two &&
read response <&8 &&
echo "$response" | grep "^:: two"
'
test_done
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