make pack-objects a bit more resilient to repo corruption

diff --git a/builtin/rerere.c b/builtin/rerere.c
index 34f9acee910406c7ba0bf9eed76267a0cf8f46c2..642bf35587ed994948d3eeac0a189ae29e39bf11 100644 (file)
--- a/builtin/rerere.c
+++ b/builtin/rerere.c
@@ -1,13 +1,16 @@
 #include "builtin.h"
 #include "cache.h"
 #include "dir.h"
+#include "parse-options.h"
 #include "string-list.h"
 #include "rerere.h"
 #include "xdiff/xdiff.h"
 #include "xdiff-interface.h"
 
-static const char git_rerere_usage[] =
-"git rerere [clear | status | diff | gc]";
+static const char * const rerere_usage[] = {
+       "git rerere [clear | status | diff | gc]",
+       NULL,
+};
 
 /* these values are days */
 static int cutoff_noresolve = 15;
@@ -19,6 +22,12 @@ static time_t rerere_created_at(const char *name)
        return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
 }
 
+static time_t rerere_last_used_at(const char *name)
+{
+       struct stat st;
+       return stat(rerere_path(name, "postimage"), &st) ? (time_t) 0 : st.st_mtime;
+}
+
 static void unlink_rr_item(const char *name)
 {
        unlink(rerere_path(name, "thisimage"));
@@ -40,7 +49,7 @@ static int git_rerere_gc_config(const char *var, const char *value, void *cb)
 
 static void garbage_collect(struct string_list *rr)
 {
-       struct string_list to_remove = { NULL, 0, 0, 1 };
+       struct string_list to_remove = STRING_LIST_INIT_DUP;
        DIR *dir;
        struct dirent *e;
        int i, cutoff;
@@ -53,13 +62,18 @@ static void garbage_collect(struct string_list *rr)
        while ((e = readdir(dir))) {
                if (is_dot_or_dotdot(e->d_name))
                        continue;
-               then = rerere_created_at(e->d_name);
-               if (!then)
-                       continue;
-               cutoff = (has_rerere_resolution(e->d_name)
-                         ? cutoff_resolve : cutoff_noresolve);
+
+               then = rerere_last_used_at(e->d_name);
+               if (then) {
+                       cutoff = cutoff_resolve;
+               } else {
+                       then = rerere_created_at(e->d_name);
+                       if (!then)
+                               continue;
+                       cutoff = cutoff_noresolve;
+               }
                if (then < now - cutoff * 86400)
-                       string_list_append(e->d_name, &to_remove);
+                       string_list_append(&to_remove, e->d_name);
        }
        for (i = 0; i < to_remove.nr; i++)
                unlink_rr_item(to_remove.items[i].string);
@@ -89,7 +103,7 @@ static int diff_two(const char *file1, const char *label1,
        printf("--- a/%s\n+++ b/%s\n", label1, label2);
        fflush(stdout);
        memset(&xpp, 0, sizeof(xpp));
-       xpp.flags = XDF_NEED_MINIMAL;
+       xpp.flags = 0;
        memset(&xecfg, 0, sizeof(xecfg));
        xecfg.ctxlen = 3;
        ecb.outf = outf;
@@ -102,26 +116,27 @@ static int diff_two(const char *file1, const char *label1,
 
 int cmd_rerere(int argc, const char **argv, const char *prefix)
 {
-       struct string_list merge_rr = { NULL, 0, 0, 1 };
-       int i, fd, flags = 0;
-
-       if (2 < argc) {
-               if (!strcmp(argv[1], "-h"))
-                       usage(git_rerere_usage);
-               if (!strcmp(argv[1], "--rerere-autoupdate"))
-                       flags = RERERE_AUTOUPDATE;
-               else if (!strcmp(argv[1], "--no-rerere-autoupdate"))
-                       flags = RERERE_NOAUTOUPDATE;
-               if (flags) {
-                       argc--;
-                       argv++;
-               }
-       }
-       if (argc < 2)
+       struct string_list merge_rr = STRING_LIST_INIT_DUP;
+       int i, fd, autoupdate = -1, flags = 0;
+
+       struct option options[] = {
+               OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,
+                       "register clean resolutions in index", 1),
+               OPT_END(),
+       };
+
+       argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);
+
+       if (autoupdate == 1)
+               flags = RERERE_AUTOUPDATE;
+       if (autoupdate == 0)
+               flags = RERERE_NOAUTOUPDATE;
+
+       if (argc < 1)
                return rerere(flags);
 
-       if (!strcmp(argv[1], "forget")) {
-               const char **pathspec = get_pathspec(prefix, argv + 2);
+       if (!strcmp(argv[0], "forget")) {
+               const char **pathspec = get_pathspec(prefix, argv + 1);
                return rerere_forget(pathspec);
        }
 
@@ -129,26 +144,26 @@ int cmd_rerere(int argc, const char **argv, const char *prefix)
        if (fd < 0)
                return 0;
 
-       if (!strcmp(argv[1], "clear")) {
+       if (!strcmp(argv[0], "clear")) {
                for (i = 0; i < merge_rr.nr; i++) {
                        const char *name = (const char *)merge_rr.items[i].util;
                        if (!has_rerere_resolution(name))
                                unlink_rr_item(name);
                }
-               unlink_or_warn(git_path("rr-cache/MERGE_RR"));
-       } else if (!strcmp(argv[1], "gc"))
+               unlink_or_warn(git_path("MERGE_RR"));
+       } else if (!strcmp(argv[0], "gc"))
                garbage_collect(&merge_rr);
-       else if (!strcmp(argv[1], "status"))
+       else if (!strcmp(argv[0], "status"))
                for (i = 0; i < merge_rr.nr; i++)
                        printf("%s\n", merge_rr.items[i].string);
-       else if (!strcmp(argv[1], "diff"))
+       else if (!strcmp(argv[0], "diff"))
                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);
                }
        else
-               usage(git_rerere_usage);
+               usage_with_options(rerere_usage, options);
 
        string_list_clear(&merge_rr, 1);
        return 0;