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9be795fbce
File descriptors 3 and 4 are special in our test suite, as
they link back to the test script's original stdout and
stderr. Normally this isn't something tests need to worry
about: they are free to clobber these descriptors for
sub-commands without affecting the overall script.
But there's one very special thing about descriptor 4: since
d88785e424 (test-lib: set BASH_XTRACEFD automatically,
2016-05-11), we ask bash to output "set -x" output to it by
number. This goes to _any_ descriptor 4, even if it no
longer points to the place it did when we set BASH_XTRACEFD.
But in t5615, we run a shell loop with descriptor 4
redirected. As a result, t5615 works with non-bash shells
even with "-x". And it works with bash without "-x". But the
combination of "bash t5615-alternate-env.sh -x" gets a test
failure (because our "set -x" output pollutes one of the
files).
We can fix this by using any descriptor _except_ the magical
4. So let's switch arbitrarily to using 5/6 in this loop,
not 3/4.
Another alternative is to use a different descriptor for
BASH_XTRACEFD. But picking an unused one turns out to be
hard. Most shells limit us to 9 numbered descriptors. Bash
can handle more, but:
- while the BASH_XTRACEFD is specific to bash, GIT_TRACE=4
has a similar problem, and would affect all shells
- constructs like "999>/dev/null" are synticatically
invalid to non-bash shells. So we have to actually bury
it inside an eval, which creates more complications.
Of the numbers 1-9, you might think that "9" would be less
used than "4". But it's not; many of our scripts use
descriptors 8 and 9 (probably under the assumption that they
are high and therefore unused). The least-used descriptor is
currently "7". We could switch to that, but we're just
trading one magic number for another.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
91 lines
2.1 KiB
Bash
Executable File
91 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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test_description='handling of alternates in environment variables'
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. ./test-lib.sh
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check_obj () {
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alt=$1; shift
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while read obj expect
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do
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echo "$obj" >&5 &&
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echo "$obj $expect" >&6
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done 5>input 6>expect &&
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GIT_ALTERNATE_OBJECT_DIRECTORIES=$alt \
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git "$@" cat-file --batch-check='%(objectname) %(objecttype)' \
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<input >actual &&
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test_cmp expect actual
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}
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test_expect_success 'create alternate repositories' '
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git init --bare one.git &&
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one=$(echo one | git -C one.git hash-object -w --stdin) &&
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git init --bare two.git &&
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two=$(echo two | git -C two.git hash-object -w --stdin)
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'
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test_expect_success 'objects inaccessible without alternates' '
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check_obj "" <<-EOF
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$one missing
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$two missing
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EOF
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'
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test_expect_success 'access alternate via absolute path' '
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check_obj "$PWD/one.git/objects" <<-EOF
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$one blob
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$two missing
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EOF
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'
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test_expect_success 'access multiple alternates' '
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check_obj "$PWD/one.git/objects:$PWD/two.git/objects" <<-EOF
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$one blob
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$two blob
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EOF
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'
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# bare paths are relative from $GIT_DIR
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test_expect_success 'access alternate via relative path (bare)' '
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git init --bare bare.git &&
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check_obj "../one.git/objects" -C bare.git <<-EOF
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$one blob
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EOF
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'
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# non-bare paths are relative to top of worktree
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test_expect_success 'access alternate via relative path (worktree)' '
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git init worktree &&
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check_obj "../one.git/objects" -C worktree <<-EOF
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$one blob
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EOF
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'
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# path is computed after moving to top-level of worktree
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test_expect_success 'access alternate via relative path (subdir)' '
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mkdir subdir &&
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check_obj "one.git/objects" -C subdir <<-EOF
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$one blob
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EOF
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'
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# set variables outside test to avoid quote insanity; the \057 is '/',
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# which doesn't need quoting, but just confirms that de-quoting
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# is working.
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quoted='"one.git\057objects"'
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unquoted='two.git/objects'
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test_expect_success 'mix of quoted and unquoted alternates' '
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check_obj "$quoted:$unquoted" <<-EOF
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$one blob
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$two blob
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EOF
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'
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test_expect_success !MINGW 'broken quoting falls back to interpreting raw' '
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mv one.git \"one.git &&
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check_obj \"one.git/objects <<-EOF
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$one blob
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EOF
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'
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test_done
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