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authorJonathan Nieder <jrnieder@gmail.com>2010-02-20 02:50:25 -0600
committerJunio C Hamano <gitster@pobox.com>2010-02-21 11:08:17 -0800
commit2d3ca21677597902f66bf2f2b2cf1b4a623f1e4f (patch)
tree52131b10c8f555acaa34ba50d5e9467d435de75f
parent60b6e2200deff208a9757721544a3a311034804f (diff)
downloadgit-2d3ca21677597902f66bf2f2b2cf1b4a623f1e4f.tar.gz
t7006-pager: if stdout is not a terminal, make a new one
Testing pagination requires (fake or real) access to a terminal so we can see whether the pagination automatically kicks in, which makes it hard to get good coverage when running tests without --verbose. There are a number of ways to work around that: - Replace all isatty calls with calls to a custom xisatty wrapper that usually checks for a terminal but can be overridden for tests. This would be workable, but it would require implementing xisatty separately in three languages (C, shell, and perl) and making sure that any code that is to be tested always uses the wrapper. - Redirect stdout to /dev/tty. This would be problematic because there might be no terminal available, and even if a terminal is available, it might not be appropriate to spew output to it. - Create a new pseudo-terminal on the fly and capture its output. This patch implements the third approach. The new test-terminal.perl helper uses IO::Pty from Expect.pm to create a terminal and executes the program specified by its arguments with that terminal as stdout. If the IO::Pty module is missing or not working on a system, the test script will maintain its old behavior (skipping most of its tests unless GIT_TEST_OPTS includes --verbose). Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rwxr-xr-xt/t7006-pager.sh35
-rwxr-xr-xt/t7006/test-terminal.perl58
2 files changed, 82 insertions, 11 deletions
diff --git a/t/t7006-pager.sh b/t/t7006-pager.sh
index 4f52ea5732..da0f96262d 100755
--- a/t/t7006-pager.sh
+++ b/t/t7006-pager.sh
@@ -5,18 +5,31 @@ test_description='Test automatic use of a pager.'
. ./test-lib.sh
rm -f stdout_is_tty
-test_expect_success 'is stdout a terminal?' '
+test_expect_success 'set up terminal for tests' '
if test -t 1
then
: > stdout_is_tty
+ elif
+ test_have_prereq PERL &&
+ "$PERL_PATH" "$TEST_DIRECTORY"/t7006/test-terminal.perl \
+ sh -c "test -t 1"
+ then
+ : > test_terminal_works
fi
'
if test -e stdout_is_tty
then
+ test_terminal() { "$@"; }
+ test_set_prereq TTY
+elif test -e test_terminal_works
+then
+ test_terminal() {
+ "$PERL_PATH" "$TEST_DIRECTORY"/t7006/test-terminal.perl "$@"
+ }
test_set_prereq TTY
else
- say stdout is not a terminal, so skipping some tests.
+ say no usable terminal, so skipping some tests
fi
unset GIT_PAGER GIT_PAGER_IN_USE
@@ -30,13 +43,13 @@ test_expect_success 'setup' '
rm -f paginated.out
test_expect_success TTY 'some commands use a pager' '
- git log &&
+ test_terminal git log &&
test -e paginated.out
'
rm -f paginated.out
test_expect_success TTY 'some commands do not use a pager' '
- git rev-list HEAD &&
+ test_terminal git rev-list HEAD &&
! test -e paginated.out
'
@@ -54,7 +67,7 @@ test_expect_success 'no pager when stdout is a regular file' '
rm -f paginated.out
test_expect_success TTY 'git --paginate rev-list uses a pager' '
- git --paginate rev-list HEAD &&
+ test_terminal git --paginate rev-list HEAD &&
test -e paginated.out
'
@@ -66,7 +79,7 @@ test_expect_success 'no pager even with --paginate when stdout is a pipe' '
rm -f paginated.out
test_expect_success TTY 'no pager with --no-pager' '
- git --no-pager log &&
+ test_terminal git --no-pager log &&
! test -e paginated.out
'
@@ -95,7 +108,7 @@ test_expect_success 'no color when stdout is a regular file' '
rm -f paginated.out
git config color.ui auto
test_expect_success TTY 'color when writing to a pager' '
- TERM=vt100 git log &&
+ TERM=vt100 test_terminal git log &&
colorful paginated.out
'
@@ -127,7 +140,7 @@ test_expect_success SIMPLEPAGER 'default pager is used by default' '
: > default_pager_used
EOF
chmod +x $less &&
- PATH=.:$PATH git log &&
+ PATH=.:$PATH test_terminal git log &&
test -e default_pager_used
'
@@ -137,7 +150,7 @@ rm -f PAGER_used
test_expect_success TTY 'PAGER overrides default pager' '
PAGER=": > PAGER_used" &&
export PAGER &&
- git log &&
+ test_terminal git log &&
test -e PAGER_used
'
@@ -147,7 +160,7 @@ test_expect_success TTY 'core.pager overrides PAGER' '
PAGER=: &&
export PAGER &&
git config core.pager ": > core.pager_used" &&
- git log &&
+ test_terminal git log &&
test -e core.pager_used
'
@@ -156,7 +169,7 @@ test_expect_success TTY 'GIT_PAGER overrides core.pager' '
git config core.pager : &&
GIT_PAGER=": > GIT_PAGER_used" &&
export GIT_PAGER &&
- git log &&
+ test_terminal git log &&
test -e GIT_PAGER_used
'
diff --git a/t/t7006/test-terminal.perl b/t/t7006/test-terminal.perl
new file mode 100755
index 0000000000..73ff809371
--- /dev/null
+++ b/t/t7006/test-terminal.perl
@@ -0,0 +1,58 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use IO::Pty;
+use File::Copy;
+
+# Run @$argv in the background with stdout redirected to $out.
+sub start_child {
+ my ($argv, $out) = @_;
+ my $pid = fork;
+ if (not defined $pid) {
+ die "fork failed: $!"
+ } elsif ($pid == 0) {
+ open STDOUT, ">&", $out;
+ close $out;
+ exec(@$argv) or die "cannot exec '$argv->[0]': $!"
+ }
+ return $pid;
+}
+
+# Wait for $pid to finish.
+sub finish_child {
+ # Simplified from wait_or_whine() in run-command.c.
+ my ($pid) = @_;
+
+ my $waiting = waitpid($pid, 0);
+ if ($waiting < 0) {
+ die "waitpid failed: $!";
+ } elsif ($? & 127) {
+ my $code = $? & 127;
+ warn "died of signal $code";
+ return $code - 128;
+ } else {
+ return $? >> 8;
+ }
+}
+
+sub xsendfile {
+ my ($out, $in) = @_;
+
+ # Note: the real sendfile() cannot read from a terminal.
+
+ # It is unspecified by POSIX whether reads
+ # from a disconnected terminal will return
+ # EIO (as in AIX 4.x, IRIX, and Linux) or
+ # end-of-file. Either is fine.
+ copy($in, $out, 4096) or $!{EIO} or die "cannot copy from child: $!";
+}
+
+if ($#ARGV < 1) {
+ die "usage: test-terminal program args";
+}
+my $master = new IO::Pty;
+my $slave = $master->slave;
+my $pid = start_child(\@ARGV, $slave);
+close $slave;
+xsendfile(\*STDOUT, $master);
+exit(finish_child($pid));