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7ec30aaa5b
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>
181 lines
4 KiB
Bash
Executable file
181 lines
4 KiB
Bash
Executable file
#!/bin/sh
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test_description='test GIT_CEILING_DIRECTORIES'
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. ./test-lib.sh
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test_prefix() {
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test_expect_success "$1" \
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"test '$2' = \"\$(git rev-parse --show-prefix)\""
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}
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test_fail() {
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test_expect_success "$1: prefix" '
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test_expect_code 128 git rev-parse --show-prefix
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'
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}
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TRASH_ROOT="$PWD"
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ROOT_PARENT=$(dirname "$TRASH_ROOT")
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unset GIT_CEILING_DIRECTORIES
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test_prefix no_ceil ""
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export GIT_CEILING_DIRECTORIES
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GIT_CEILING_DIRECTORIES=""
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test_prefix ceil_empty ""
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GIT_CEILING_DIRECTORIES="$ROOT_PARENT"
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test_prefix ceil_at_parent ""
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GIT_CEILING_DIRECTORIES="$ROOT_PARENT/"
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test_prefix ceil_at_parent_slash ""
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
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test_prefix ceil_at_trash ""
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
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test_prefix ceil_at_trash_slash ""
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
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test_prefix ceil_at_sub ""
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/"
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test_prefix ceil_at_sub_slash ""
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if test_have_prereq SYMLINKS
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then
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ln -s sub top
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fi
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mkdir -p sub/dir || exit 1
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cd sub/dir || exit 1
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unset GIT_CEILING_DIRECTORIES
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test_prefix subdir_no_ceil "sub/dir/"
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export GIT_CEILING_DIRECTORIES
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GIT_CEILING_DIRECTORIES=""
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test_prefix subdir_ceil_empty "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
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test_fail subdir_ceil_at_trash
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
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test_fail subdir_ceil_at_trash_slash
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
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test_fail subdir_ceil_at_sub
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/"
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test_fail subdir_ceil_at_sub_slash
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if test_have_prereq SYMLINKS
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then
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/top"
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test_fail subdir_ceil_at_top
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/top/"
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test_fail subdir_ceil_at_top_slash
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GIT_CEILING_DIRECTORIES=":$TRASH_ROOT/top"
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test_prefix subdir_ceil_at_top_no_resolve "sub/dir/"
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GIT_CEILING_DIRECTORIES=":$TRASH_ROOT/top/"
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test_prefix subdir_ceil_at_top_slash_no_resolve "sub/dir/"
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fi
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/dir"
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test_prefix subdir_ceil_at_subdir "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/dir/"
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test_prefix subdir_ceil_at_subdir_slash "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su"
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test_prefix subdir_ceil_at_su "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su/"
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test_prefix subdir_ceil_at_su_slash "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/di"
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test_prefix subdir_ceil_at_sub_di "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub/di"
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test_prefix subdir_ceil_at_sub_di_slash "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/subdi"
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test_prefix subdir_ceil_at_subdi "sub/dir/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/subdi"
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test_prefix subdir_ceil_at_subdi_slash "sub/dir/"
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GIT_CEILING_DIRECTORIES="/foo:$TRASH_ROOT/sub"
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test_fail second_of_two
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub:/bar"
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test_fail first_of_two
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GIT_CEILING_DIRECTORIES="/foo:$TRASH_ROOT/sub:/bar"
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test_fail second_of_three
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sub"
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GIT_DIR=../../.git
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export GIT_DIR
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test_prefix git_dir_specified ""
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unset GIT_DIR
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cd ../.. || exit 1
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mkdir -p s/d || exit 1
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cd s/d || exit 1
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unset GIT_CEILING_DIRECTORIES
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test_prefix sd_no_ceil "s/d/"
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export GIT_CEILING_DIRECTORIES
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GIT_CEILING_DIRECTORIES=""
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test_prefix sd_ceil_empty "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT"
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test_fail sd_ceil_at_trash
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/"
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test_fail sd_ceil_at_trash_slash
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s"
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test_fail sd_ceil_at_s
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/"
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test_fail sd_ceil_at_s_slash
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/d"
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test_prefix sd_ceil_at_sd "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/d/"
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test_prefix sd_ceil_at_sd_slash "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su"
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test_prefix sd_ceil_at_su "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/su/"
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test_prefix sd_ceil_at_su_slash "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/di"
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test_prefix sd_ceil_at_s_di "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/s/di"
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test_prefix sd_ceil_at_s_di_slash "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sdi"
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test_prefix sd_ceil_at_sdi "s/d/"
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GIT_CEILING_DIRECTORIES="$TRASH_ROOT/sdi"
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test_prefix sd_ceil_at_sdi_slash "s/d/"
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test_done
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