#include "cache.h"
#include "exec-cmd.h"
#include "attr.h"

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

        sigemptyset(&unblock);
        sigaddset(&unblock, SIGPIPE);
        sigprocmask(SIG_UNBLOCK, &unblock, NULL);
        signal(SIGPIPE, SIG_DFL);
}

int main(int argc, const char **argv)
{
        int result;

        trace2_initialize_clock();

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

        git_resolve_executable_dir(argv[0]);

        trace2_initialize();
        trace2_cmd_start(argv);
        trace2_collect_process_info();

        git_setup_gettext();

        initialize_the_repository();

        attr_start();

        result = cmd_main(argc, argv);

        trace2_cmd_exit(result);

        return result;
}