t4201: make use of abbreviation in the test more robust

diff --git a/builtin/rerere.c b/builtin/rerere.c
index 7afadd2eadd59d8d3f4b77ad902bc24c94af9ec6..1bf72423bf72d7b7d224c14808b0652d78305d63 100644 (file)
--- a/builtin/rerere.c
+++ b/builtin/rerere.c
@@ -29,9 +29,10 @@ static int diff_two(const char *file1, const char *label1,
        xdemitconf_t xecfg;
        xdemitcb_t ecb;
        mmfile_t minus, plus;
+       int ret;
 
        if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
-               return 1;
+               return -1;
 
        printf("--- a/%s\n+++ b/%s\n", label1, label2);
        fflush(stdout);
@@ -40,17 +41,17 @@ static int diff_two(const char *file1, const char *label1,
        memset(&xecfg, 0, sizeof(xecfg));
        xecfg.ctxlen = 3;
        ecb.outf = outf;
-       xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
+       ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
 
        free(minus.ptr);
        free(plus.ptr);
-       return 0;
+       return ret;
 }
 
 int cmd_rerere(int argc, const char **argv, const char *prefix)
 {
        struct string_list merge_rr = STRING_LIST_INIT_DUP;
-       int i, fd, autoupdate = -1, flags = 0;
+       int i, autoupdate = -1, flags = 0;
 
        struct option options[] = {
                OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
@@ -79,18 +80,16 @@ int cmd_rerere(int argc, const char **argv, const char *prefix)
                return rerere_forget(&pathspec);
        }
 
-       fd = setup_rerere(&merge_rr, flags);
-       if (fd < 0)
-               return 0;
-
        if (!strcmp(argv[0], "clear")) {
                rerere_clear(&merge_rr);
        } else if (!strcmp(argv[0], "gc"))
                rerere_gc(&merge_rr);
-       else if (!strcmp(argv[0], "status"))
+       else if (!strcmp(argv[0], "status")) {
+               if (setup_rerere(&merge_rr, flags | RERERE_READONLY) < 0)
+                       return 0;
                for (i = 0; i < merge_rr.nr; i++)
                        printf("%s\n", merge_rr.items[i].string);
-       else if (!strcmp(argv[0], "remaining")) {
+       } else if (!strcmp(argv[0], "remaining")) {
                rerere_remaining(&merge_rr);
                for (i = 0; i < merge_rr.nr; i++) {
                        if (merge_rr.items[i].util != RERERE_RESOLVED)
@@ -100,13 +99,16 @@ int cmd_rerere(int argc, const char **argv, const char *prefix)
                                 * string_list_clear() */
                                merge_rr.items[i].util = NULL;
                }
-       } else if (!strcmp(argv[0], "diff"))
+       } else if (!strcmp(argv[0], "diff")) {
+               if (setup_rerere(&merge_rr, flags | RERERE_READONLY) < 0)
+                       return 0;
                for (i = 0; i < merge_rr.nr; i++) {
                        const char *path = merge_rr.items[i].string;
-                       const char *name = (const char *)merge_rr.items[i].util;
-                       diff_two(rerere_path(name, "preimage"), path, path, path);
+                       const struct rerere_id *id = merge_rr.items[i].util;
+                       if (diff_two(rerere_path(id, "preimage"), path, path, path))
+                               die("unable to generate diff for %s", rerere_path(id, NULL));
                }
-       else
+       } else
                usage_with_options(rerere_usage, options);
 
        string_list_clear(&merge_rr, 1);