From 13274526c1fc62fd0f15fe2bc188843982f38ec9 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Fri, 30 Nov 2012 17:40:50 -0500
Subject: [PATCH 1/6] run-command: drop silent_exec_failure arg from
wait_or_whine
We do not actually use this parameter; instead we complain
from the child itself (for fork/exec) or from start_command
(if we are using spawn on Windows).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
run-command.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/run-command.c b/run-command.c
index 3b982e4d55..3aae270dd3 100644
--- a/run-command.c
+++ b/run-command.c
@@ -226,7 +226,7 @@ static inline void set_cloexec(int fd)
fcntl(fd, F_SETFD, flags | FD_CLOEXEC);
}
-static int wait_or_whine(pid_t pid, const char *argv0, int silent_exec_failure)
+static int wait_or_whine(pid_t pid, const char *argv0)
{
int status, code = -1;
pid_t waiting;
@@ -432,8 +432,7 @@ fail_pipe:
* At this point we know that fork() succeeded, but execvp()
* failed. Errors have been reported to our stderr.
*/
- wait_or_whine(cmd->pid, cmd->argv[0],
- cmd->silent_exec_failure);
+ wait_or_whine(cmd->pid, cmd->argv[0]);
failed_errno = errno;
cmd->pid = -1;
}
@@ -538,7 +537,7 @@ fail_pipe:
int finish_command(struct child_process *cmd)
{
- return wait_or_whine(cmd->pid, cmd->argv[0], cmd->silent_exec_failure);
+ return wait_or_whine(cmd->pid, cmd->argv[0]);
}
int run_command(struct child_process *cmd)
From f42ca31d8d209a43342ea345a52fc0bd43d71cc8 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Fri, 30 Nov 2012 17:41:04 -0500
Subject: [PATCH 2/6] launch_editor: refactor to use start/finish_command
The launch_editor function uses the convenient run_command_*
interface. Let's use the more flexible start_command and
finish_command functions, which will let us manipulate the
parent state while we're waiting for the child to finish.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
editor.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/editor.c b/editor.c
index d8340031d2..842f7829fc 100644
--- a/editor.c
+++ b/editor.c
@@ -37,8 +37,16 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
if (strcmp(editor, ":")) {
const char *args[] = { editor, path, NULL };
+ struct child_process p;
- if (run_command_v_opt_cd_env(args, RUN_USING_SHELL, NULL, env))
+ memset(&p, 0, sizeof(p));
+ p.argv = args;
+ p.env = env;
+ p.use_shell = 1;
+ if (start_command(&p) < 0)
+ return error("unable to start editor '%s'", editor);
+
+ if (finish_command(&p))
return error("There was a problem with the editor '%s'.",
editor);
}
From 913ef36093eac3ec78b5fb155cc2beb5843b1ce5 Mon Sep 17 00:00:00 2001
From: Paul Fox <pgf@foxharp.boston.ma.us>
Date: Fri, 30 Nov 2012 17:41:26 -0500
Subject: [PATCH 3/6] launch_editor: ignore terminal signals while editor has
control
The user's editor likely catches SIGINT (ctrl-C). but if
the user spawns a command from the editor and uses ctrl-C to
kill that command, the SIGINT will likely also kill git
itself (depending on the editor, this can leave the terminal
in an unusable state).
Let's ignore it while the editor is running, and do the same
for SIGQUIT, which many editors also ignore. This matches
the behavior if we were to use system(3) instead of
run-command.
Signed-off-by: Paul Fox <pgf@foxharp.boston.ma.us>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
editor.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/editor.c b/editor.c
index 842f7829fc..c892a81ae3 100644
--- a/editor.c
+++ b/editor.c
@@ -1,6 +1,7 @@
#include "cache.h"
#include "strbuf.h"
#include "run-command.h"
+#include "sigchain.h"
#ifndef DEFAULT_EDITOR
#define DEFAULT_EDITOR "vi"
@@ -38,6 +39,7 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
if (strcmp(editor, ":")) {
const char *args[] = { editor, path, NULL };
struct child_process p;
+ int ret;
memset(&p, 0, sizeof(p));
p.argv = args;
@@ -46,7 +48,12 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
if (start_command(&p) < 0)
return error("unable to start editor '%s'", editor);
- if (finish_command(&p))
+ sigchain_push(SIGINT, SIG_IGN);
+ sigchain_push(SIGQUIT, SIG_IGN);
+ ret = finish_command(&p);
+ sigchain_pop(SIGINT);
+ sigchain_pop(SIGQUIT);
+ if (ret)
return error("There was a problem with the editor '%s'.",
editor);
}
From a2767c5c91ebda3c083419c80a7f64248c5ec175 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Fri, 30 Nov 2012 17:41:38 -0500
Subject: [PATCH 4/6] run-command: do not warn about child death from terminal
SIGINT and SIGQUIT are not generally interesting signals to
the user, since they are typically caused by them hitting "^C"
or otherwise telling their terminal to send the signal.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
run-command.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/run-command.c b/run-command.c
index 3aae270dd3..757f263cd6 100644
--- a/run-command.c
+++ b/run-command.c
@@ -242,7 +242,8 @@ static int wait_or_whine(pid_t pid, const char *argv0)
error("waitpid is confused (%s)", argv0);
} else if (WIFSIGNALED(status)) {
code = WTERMSIG(status);
- error("%s died of signal %d", argv0, code);
+ if (code != SIGINT && code != SIGQUIT)
+ error("%s died of signal %d", argv0, code);
/*
* This return value is chosen so that code & 0xff
* mimics the exit code that a POSIX shell would report for
From 1250857c6c2695020bce6669a4ff43d57a507d91 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Fri, 30 Nov 2012 17:41:50 -0500
Subject: [PATCH 5/6] launch_editor: propagate signals from editor to git
We block SIGINT and SIGQUIT while the editor runs so that
git is not killed accidentally by a stray "^C" meant for the
editor or its subprocesses. This works because most editors
ignore SIGINT.
However, some editor wrappers, like emacsclient, expect to
die due to ^C. We detect the signal death in the editor and
properly exit, but not before writing a useless error
message to stderr. Instead, let's notice when the editor was
killed by a terminal signal and just raise the signal on
ourselves. This skips the message and looks to our parent
like we received SIGINT ourselves.
The end effect is that if the user's editor ignores SIGINT,
we will, too. And if it does not, then we will behave as if
we did not ignore it. That should make all users happy.
Note that in the off chance that another part of git has
ignored SIGINT while calling launch_editor, we will still
properly detect and propagate the failed return code from
the editor (i.e., the worst case is that we generate the
useless error, not fail to notice the editor's death).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
editor.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/editor.c b/editor.c
index c892a81ae3..065a7abf2f 100644
--- a/editor.c
+++ b/editor.c
@@ -39,7 +39,7 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
if (strcmp(editor, ":")) {
const char *args[] = { editor, path, NULL };
struct child_process p;
- int ret;
+ int ret, sig;
memset(&p, 0, sizeof(p));
p.argv = args;
@@ -51,8 +51,11 @@ int launch_editor(const char *path, struct strbuf *buffer, const char *const *en
sigchain_push(SIGINT, SIG_IGN);
sigchain_push(SIGQUIT, SIG_IGN);
ret = finish_command(&p);
+ sig = ret + 128;
sigchain_pop(SIGINT);
sigchain_pop(SIGQUIT);
+ if (sig == SIGINT || sig == SIGQUIT)
+ raise(sig);
if (ret)
return error("There was a problem with the editor '%s'.",
editor);
From 0398fc349627a8a55ec4727bfb85fb7fad1f4ff0 Mon Sep 17 00:00:00 2001
From: Jeff King <peff@peff.net>
Date: Sat, 5 Jan 2013 09:52:29 -0500
Subject: [PATCH 6/6] fix compilation with NO_PTHREADS
Commit 1327452 cleaned up an unused parameter from
wait_or_whine, but forgot to update a caller that is inside
"#ifdef NO_PTHREADS".
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
run-command.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/run-command.c b/run-command.c
index 757f263cd6..24eaad5c66 100644
--- a/run-command.c
+++ b/run-command.c
@@ -725,7 +725,7 @@ error:
int finish_async(struct async *async)
{
#ifdef NO_PTHREADS
- return wait_or_whine(async->pid, "child process", 0);
+ return wait_or_whine(async->pid, "child process");
#else
void *ret = (void *)(intptr_t)(-1);