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terminal: accommodate Git for Windows' default terminal

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Git for Windows' Git Bash runs in MinTTY by default, which does not have
a Win32 Console instance, but uses MSYS2 pseudo terminals instead.

This is a problem, as Git for Windows does not want to use the MSYS2
emulation layer for Git itself, and therefore has no direct way to
interact with that pseudo terminal.

As a workaround, use the `stty` utility (which is included in Git for
Windows, and which *is* an MSYS2 program, so it knows how to deal with
the pseudo terminal).

Note: If Git runs in a regular CMD or PowerShell window, there *is* a
regular Win32 Console to work with. This is not a problem for the MSYS2
`stty`: it copes with this scenario just fine.

Also note that we introduce support for more bits than would be
necessary for a mere `disable_echo()` here, in preparation for the
upcoming `enable_non_canonical()` function.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Johannes Schindelin 2020-01-14 18:43:48 +00:00 committed by Junio C Hamano
parent 94ac3c31f7
commit 9ea416cb51
1 changed files with 50 additions and 0 deletions
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50
compat/terminal.c
View file

@ -2,6 +2,8 @@
#include "compat/terminal.h"
#include "sigchain.h"
#include "strbuf.h"
#include "run-command.h"
#include "string-list.h"
#if defined(HAVE_DEV_TTY) || defined(GIT_WINDOWS_NATIVE)
@ -64,11 +66,28 @@ static int disable_echo(void)
#define OUTPUT_PATH "CONOUT$"
#define FORCE_TEXT "t"
static int use_stty = 1;
static struct string_list stty_restore = STRING_LIST_INIT_DUP;
static HANDLE hconin = INVALID_HANDLE_VALUE;
static DWORD cmode;
static void restore_term(void)
{
if (use_stty) {
int i;
struct child_process cp = CHILD_PROCESS_INIT;
if (stty_restore.nr == 0)
return;
argv_array_push(&cp.args, "stty");
for (i = 0; i < stty_restore.nr; i++)
argv_array_push(&cp.args, stty_restore.items[i].string);
run_command(&cp);
string_list_clear(&stty_restore, 0);
return;
}
if (hconin == INVALID_HANDLE_VALUE)
return;
@ -79,6 +98,37 @@ static void restore_term(void)
static int disable_bits(DWORD bits)
{
if (use_stty) {
struct child_process cp = CHILD_PROCESS_INIT;
argv_array_push(&cp.args, "stty");
if (bits & ENABLE_LINE_INPUT) {
string_list_append(&stty_restore, "icanon");
argv_array_push(&cp.args, "-icanon");
}
if (bits & ENABLE_ECHO_INPUT) {
string_list_append(&stty_restore, "echo");
argv_array_push(&cp.args, "-echo");
}
if (bits & ENABLE_PROCESSED_INPUT) {
string_list_append(&stty_restore, "-ignbrk");
string_list_append(&stty_restore, "intr");
string_list_append(&stty_restore, "^c");
argv_array_push(&cp.args, "ignbrk");
argv_array_push(&cp.args, "intr");
argv_array_push(&cp.args, "");
}
if (run_command(&cp) == 0)
return 0;
/* `stty` could not be executed; access the Console directly */
use_stty = 0;
}
hconin = CreateFile("CONIN$", GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ, NULL, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, NULL);