git

1
#define USE_THE_REPOSITORY_VARIABLE
2

3
#include "git-compat-util.h"
4
#include "exec-cmd.h"
5
#include "gettext.h"
6
#include "attr.h"
7
#include "repository.h"
8
#include "setup.h"
9
#include "strbuf.h"
10
#include "trace2.h"
11

12
/*
13
 * Many parts of Git have subprograms communicate via pipe, expect the
14
 * upstream of a pipe to die with SIGPIPE when the downstream of a
15
 * pipe does not need to read all that is written.  Some third-party
16
 * programs that ignore or block SIGPIPE for their own reason forget
17
 * to restore SIGPIPE handling to the default before spawning Git and
18
 * break this carefully orchestrated machinery.
19
 *
20
 * Restore the way SIGPIPE is handled to default, which is what we
21
 * expect.
22
 */
23
static void restore_sigpipe_to_default(void)
24
{
25
	sigset_t unblock;
26

27
	sigemptyset(&unblock);
28
	sigaddset(&unblock, SIGPIPE);
29
	sigprocmask(SIG_UNBLOCK, &unblock, NULL);
30
	signal(SIGPIPE, SIG_DFL);
31
}
32

33
int main(int argc, const char **argv)
34
{
35
	int result;
36
	struct strbuf tmp = STRBUF_INIT;
37

38
	trace2_initialize_clock();
39

40
	/*
41
	 * Always open file descriptors 0/1/2 to avoid clobbering files
42
	 * in die().  It also avoids messing up when the pipes are dup'ed
43
	 * onto stdin/stdout/stderr in the child processes we spawn.
44
	 */
45
	sanitize_stdfds();
46
	restore_sigpipe_to_default();
47

48
	git_resolve_executable_dir(argv[0]);
49

50
	setlocale(LC_CTYPE, "");
51
	git_setup_gettext();
52

53
	initialize_repository(the_repository);
54

55
	attr_start();
56

57
	trace2_initialize();
58
	trace2_cmd_start(argv);
59
	trace2_collect_process_info(TRACE2_PROCESS_INFO_STARTUP);
60

61
	if (!strbuf_getcwd(&tmp))
62
		tmp_original_cwd = strbuf_detach(&tmp, NULL);
63

64
	result = cmd_main(argc, argv);
65

66
	/* Not exit(3), but a wrapper calling our common_exit() */
67
	exit(result);
68
}
69

70
static void check_bug_if_BUG(void)
71
{
72
	if (!bug_called_must_BUG)
73
		return;
74
	BUG("on exit(): had bug() call(s) in this process without explicit BUG_if_bug()");
75
}
76

77
/* We wrap exit() to call common_exit() in git-compat-util.h */
78
int common_exit(const char *file, int line, int code)
79
{
80
	/*
81
	 * For non-POSIX systems: Take the lowest 8 bits of the "code"
82
	 * to e.g. turn -1 into 255. On a POSIX system this is
83
	 * redundant, see exit(3) and wait(2), but as it doesn't harm
84
	 * anything there we don't need to guard this with an "ifdef".
85
	 */
86
	code &= 0xff;
87

88
	check_bug_if_BUG();
89
	trace2_cmd_exit_fl(file, line, code);
90

91
	return code;
92
}
93