run-command: use BUG() to report bugs, not die()

diff --git a/run-command.c b/run-command.c
index 31fc5ea86eb6a3fe3650b8ac50f19f8621d90b9d..0ad6f135d5a916e6b5b11dddbd6b02010419440a 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -1,11 +1,12 @@
 #include "cache.h"
 #include "run-command.h"
-#include "exec_cmd.h"
+#include "exec-cmd.h"
 #include "sigchain.h"
 #include "argv-array.h"
 #include "thread-utils.h"
 #include "strbuf.h"
 #include "string-list.h"
+#include "quote.h"
 
 void child_process_init(struct child_process *child)
 {
@@ -470,15 +471,12 @@ struct atfork_state {
        sigset_t old;
 };
 
-#ifndef NO_PTHREADS
-static void bug_die(int err, const char *msg)
-{
-       if (err) {
-               errno = err;
-               die_errno("BUG: %s", msg);
-       }
-}
-#endif
+#define CHECK_BUG(err, msg) \
+       do { \
+               int e = (err); \
+               if (e) \
+                       BUG("%s: %s", msg, strerror(e)); \
+       } while(0)
 
 static void atfork_prepare(struct atfork_state *as)
 {
@@ -490,9 +488,9 @@ static void atfork_prepare(struct atfork_state *as)
        if (sigprocmask(SIG_SETMASK, &all, &as->old))
                die_errno("sigprocmask");
 #else
-       bug_die(pthread_sigmask(SIG_SETMASK, &all, &as->old),
+       CHECK_BUG(pthread_sigmask(SIG_SETMASK, &all, &as->old),
                "blocking all signals");
-       bug_die(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs),
+       CHECK_BUG(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &as->cs),
                "disabling cancellation");
 #endif
 }
@@ -503,9 +501,9 @@ static void atfork_parent(struct atfork_state *as)
        if (sigprocmask(SIG_SETMASK, &as->old, NULL))
                die_errno("sigprocmask");
 #else
-       bug_die(pthread_setcancelstate(as->cs, NULL),
+       CHECK_BUG(pthread_setcancelstate(as->cs, NULL),
                "re-enabling cancellation");
-       bug_die(pthread_sigmask(SIG_SETMASK, &as->old, NULL),
+       CHECK_BUG(pthread_sigmask(SIG_SETMASK, &as->old, NULL),
                "restoring signal mask");
 #endif
 }
@@ -556,6 +554,90 @@ static int wait_or_whine(pid_t pid, const char *argv0, int in_signal)
        return code;
 }
 
+static void trace_add_env(struct strbuf *dst, const char *const *deltaenv)
+{
+       struct string_list envs = STRING_LIST_INIT_DUP;
+       const char *const *e;
+       int i;
+       int printed_unset = 0;
+
+       /* Last one wins, see run-command.c:prep_childenv() for context */
+       for (e = deltaenv; e && *e; e++) {
+               struct strbuf key = STRBUF_INIT;
+               char *equals = strchr(*e, '=');
+
+               if (equals) {
+                       strbuf_add(&key, *e, equals - *e);
+                       string_list_insert(&envs, key.buf)->util = equals + 1;
+               } else {
+                       string_list_insert(&envs, *e)->util = NULL;
+               }
+               strbuf_release(&key);
+       }
+
+       /* "unset X Y...;" */
+       for (i = 0; i < envs.nr; i++) {
+               const char *var = envs.items[i].string;
+               const char *val = envs.items[i].util;
+
+               if (val || !getenv(var))
+                       continue;
+
+               if (!printed_unset) {
+                       strbuf_addstr(dst, " unset");
+                       printed_unset = 1;
+               }
+               strbuf_addf(dst, " %s", var);
+       }
+       if (printed_unset)
+               strbuf_addch(dst, ';');
+
+       /* ... followed by "A=B C=D ..." */
+       for (i = 0; i < envs.nr; i++) {
+               const char *var = envs.items[i].string;
+               const char *val = envs.items[i].util;
+               const char *oldval;
+
+               if (!val)
+                       continue;
+
+               oldval = getenv(var);
+               if (oldval && !strcmp(val, oldval))
+                       continue;
+
+               strbuf_addf(dst, " %s=", var);
+               sq_quote_buf_pretty(dst, val);
+       }
+       string_list_clear(&envs, 0);
+}
+
+static void trace_run_command(const struct child_process *cp)
+{
+       struct strbuf buf = STRBUF_INIT;
+
+       if (!trace_want(&trace_default_key))
+               return;
+
+       strbuf_addstr(&buf, "trace: run_command:");
+       if (cp->dir) {
+               strbuf_addstr(&buf, " cd ");
+               sq_quote_buf_pretty(&buf, cp->dir);
+               strbuf_addch(&buf, ';');
+       }
+       /*
+        * The caller is responsible for initializing cp->env from
+        * cp->env_array if needed. We only check one place.
+        */
+       if (cp->env)
+               trace_add_env(&buf, cp->env);
+       if (cp->git_cmd)
+               strbuf_addstr(&buf, " git");
+       sq_quote_argv_pretty(&buf, cp->argv);
+
+       trace_printf("%s", buf.buf);
+       strbuf_release(&buf);
+}
+
 int start_command(struct child_process *cmd)
 {
        int need_in, need_out, need_err;
@@ -624,7 +706,8 @@ int start_command(struct child_process *cmd)
                cmd->err = fderr[0];
        }
 
-       trace_argv_printf(cmd->argv, "trace: run_command:");
+       trace_run_command(cmd);
+
        fflush(NULL);
 
 #ifndef GIT_WINDOWS_NATIVE