sha1_file: allow link_alt_odb_entries to handle arbitrary repositories

diff --git a/run-command.c b/run-command.c
index eadba8cb0d510aab2357b0998286a0c0aac4c2b0..a483d5904a3ec1acae8908dd2e699fa00bcaaa9d 100644 (file)
--- a/run-command.c
+++ b/run-command.c
@@ -557,6 +557,63 @@ 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;
@@ -565,6 +622,19 @@ static void trace_run_command(const struct child_process *cp)
                return;
 
        strbuf_addf(&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);