git/t/t1504-ceiling-dirs.sh

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#!/bin/sh
test_description='test GIT_CEILING_DIRECTORIES'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_prefix() {
local expect="$2" &&
test_expect_success "$1: git rev-parse --show-prefix is '$2'" '
echo "$expect" >expect &&
git rev-parse --show-prefix >actual &&
test_cmp expect actual
'
}
test_fail() {
test_expect_success "$1: prefix" '
test_expect_code 128 git rev-parse --show-prefix
'
}
TRASH_ROOT="$PWD"
ROOT_PARENT=$(dirname "$TRASH_ROOT")
unset GIT_CEILING_DIRECTORIES
test_prefix no_ceil ""
export GIT_CEILING_DIRECTORIES
GIT_CEILING_DIRECTORIES=""
test_prefix ceil_empty ""
GIT_CEILING_DIRECTORIES="$ROOT_PARENT"
test_prefix ceil_at_parent ""
GIT_CEILING_DIRECTORIES="$ROOT_PARENT/"
test_prefix ceil_at_parent_slash ""
GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
test_prefix ceil_at_trash ""
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
test_prefix ceil_at_trash_slash ""
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
test_prefix ceil_at_sub ""
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/"
test_prefix ceil_at_sub_slash ""
Provide a mechanism to turn off symlink resolution in ceiling paths Commit 1b77d83cab 'setup_git_directory_gently_1(): resolve symlinks in ceiling paths' changed the setup code to resolve symlinks in the entries in GIT_CEILING_DIRECTORIES. Because those entries are compared textually to the symlink-resolved current directory, an entry in GIT_CEILING_DIRECTORIES that contained a symlink would have no effect. It was known that this could cause performance problems if the symlink resolution *itself* touched slow filesystems, but it was thought that such use cases would be unlikely. The intention of the earlier change was to deal with a case when the user has this: GIT_CEILING_DIRECTORIES=/home/gitster but in reality, /home/gitster is a symbolic link to somewhere else, e.g. /net/machine/home4/gitster. A textual comparison between the specified value /home/gitster and the location getcwd(3) returns would not help us, but readlink("/home/gitster") would still be fast. After this change was released, Anders Kaseorg <andersk@mit.edu> reported: > [...] my computer has been acting so slow when I’m not connected to > the network. I put various network filesystem paths in > $GIT_CEILING_DIRECTORIES, such as > /afs/athena.mit.edu/user/a/n/andersk (to avoid hitting its parents > /afs/athena.mit.edu, /afs/athena.mit.edu/user/a, and > /afs/athena.mit.edu/user/a/n which all live in different AFS > volumes). Now when I’m not connected to the network, every > invocation of Git, including the __git_ps1 in my shell prompt, waits > for AFS to timeout. To allow users to work around this problem, give them a mechanism to turn off symlink resolution in GIT_CEILING_DIRECTORIES entries. All the entries that follow an empty entry will not be checked for symbolic links and used literally in comparison. E.g. with these: GIT_CEILING_DIRECTORIES=:/foo/bar:/xyzzy or GIT_CEILING_DIRECTORIES=/foo/bar::/xyzzy we will not readlink("/xyzzy") because it comes after an empty entry. With the former (but not with the latter), "/foo/bar" comes after an empty entry, and we will not readlink it, either. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-20 09:09:24 +00:00
if test_have_prereq SYMLINKS
then
ln -s sub top
fi
mkdir -p sub/dir || exit 1
cd sub/dir || exit 1
unset GIT_CEILING_DIRECTORIES
test_prefix subdir_no_ceil "sub/dir/"
export GIT_CEILING_DIRECTORIES
GIT_CEILING_DIRECTORIES=""
test_prefix subdir_ceil_empty "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
test_fail subdir_ceil_at_trash
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
test_fail subdir_ceil_at_trash_slash
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
test_fail subdir_ceil_at_sub
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/"
test_fail subdir_ceil_at_sub_slash
Provide a mechanism to turn off symlink resolution in ceiling paths Commit 1b77d83cab 'setup_git_directory_gently_1(): resolve symlinks in ceiling paths' changed the setup code to resolve symlinks in the entries in GIT_CEILING_DIRECTORIES. Because those entries are compared textually to the symlink-resolved current directory, an entry in GIT_CEILING_DIRECTORIES that contained a symlink would have no effect. It was known that this could cause performance problems if the symlink resolution *itself* touched slow filesystems, but it was thought that such use cases would be unlikely. The intention of the earlier change was to deal with a case when the user has this: GIT_CEILING_DIRECTORIES=/home/gitster but in reality, /home/gitster is a symbolic link to somewhere else, e.g. /net/machine/home4/gitster. A textual comparison between the specified value /home/gitster and the location getcwd(3) returns would not help us, but readlink("/home/gitster") would still be fast. After this change was released, Anders Kaseorg <andersk@mit.edu> reported: > [...] my computer has been acting so slow when I’m not connected to > the network. I put various network filesystem paths in > $GIT_CEILING_DIRECTORIES, such as > /afs/athena.mit.edu/user/a/n/andersk (to avoid hitting its parents > /afs/athena.mit.edu, /afs/athena.mit.edu/user/a, and > /afs/athena.mit.edu/user/a/n which all live in different AFS > volumes). Now when I’m not connected to the network, every > invocation of Git, including the __git_ps1 in my shell prompt, waits > for AFS to timeout. To allow users to work around this problem, give them a mechanism to turn off symlink resolution in GIT_CEILING_DIRECTORIES entries. All the entries that follow an empty entry will not be checked for symbolic links and used literally in comparison. E.g. with these: GIT_CEILING_DIRECTORIES=:/foo/bar:/xyzzy or GIT_CEILING_DIRECTORIES=/foo/bar::/xyzzy we will not readlink("/xyzzy") because it comes after an empty entry. With the former (but not with the latter), "/foo/bar" comes after an empty entry, and we will not readlink it, either. Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-02-20 09:09:24 +00:00
if test_have_prereq SYMLINKS
then
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/top"
test_fail subdir_ceil_at_top
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/top/"
test_fail subdir_ceil_at_top_slash
GIT_CEILING_DIRECTORIES=":$TRASH_ROOT/top"
test_prefix subdir_ceil_at_top_no_resolve "sub/dir/"
GIT_CEILING_DIRECTORIES=":$TRASH_ROOT/top/"
test_prefix subdir_ceil_at_top_slash_no_resolve "sub/dir/"
fi
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/dir"
test_prefix subdir_ceil_at_subdir "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/dir/"
test_prefix subdir_ceil_at_subdir_slash "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su"
test_prefix subdir_ceil_at_su "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su/"
test_prefix subdir_ceil_at_su_slash "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/di"
test_prefix subdir_ceil_at_sub_di "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/di"
test_prefix subdir_ceil_at_sub_di_slash "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/subdi"
test_prefix subdir_ceil_at_subdi "sub/dir/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/subdi"
test_prefix subdir_ceil_at_subdi_slash "sub/dir/"
GIT_CEILING_DIRECTORIES="/foo:$TRASH_ROOT/sub"
test_fail second_of_two
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub:/bar"
test_fail first_of_two
GIT_CEILING_DIRECTORIES="/foo:$TRASH_ROOT/sub:/bar"
test_fail second_of_three
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
GIT_DIR=../../.git
export GIT_DIR
test_prefix git_dir_specified ""
unset GIT_DIR
cd ../.. || exit 1
mkdir -p s/d || exit 1
cd s/d || exit 1
unset GIT_CEILING_DIRECTORIES
test_prefix sd_no_ceil "s/d/"
export GIT_CEILING_DIRECTORIES
GIT_CEILING_DIRECTORIES=""
test_prefix sd_ceil_empty "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
test_fail sd_ceil_at_trash
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
test_fail sd_ceil_at_trash_slash
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s"
test_fail sd_ceil_at_s
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/"
test_fail sd_ceil_at_s_slash
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/d"
test_prefix sd_ceil_at_sd "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/d/"
test_prefix sd_ceil_at_sd_slash "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su"
test_prefix sd_ceil_at_su "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su/"
test_prefix sd_ceil_at_su_slash "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/di"
test_prefix sd_ceil_at_s_di "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/di"
test_prefix sd_ceil_at_s_di_slash "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sdi"
test_prefix sd_ceil_at_sdi "s/d/"
GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sdi"
test_prefix sd_ceil_at_sdi_slash "s/d/"
test_done