doc: clarify how -S works

diff --git a/builtin-fsck.c b/builtin-fsck.c
index aecc8280a0aedb37437ccce446f3382ccba08829..64dffa542170fcceedc766ae6551134f61779893 100644 (file)
--- a/builtin-fsck.c
+++ b/builtin-fsck.c
@@ -23,6 +23,7 @@ static int check_full;
 static int check_strict;
 static int keep_cache_objects;
 static unsigned char head_sha1[20];
+static const char *head_points_at;
 static int errors_found;
 static int write_lost_and_found;
 static int verbose;
@@ -473,6 +474,8 @@ static int fsck_handle_ref(const char *refname, const unsigned char *sha1, int f
 
 static void get_default_heads(void)
 {
+       if (head_points_at && !is_null_sha1(head_sha1))
+               fsck_handle_ref("HEAD", head_sha1, 0, NULL);
        for_each_ref(fsck_handle_ref, NULL);
        if (include_reflogs)
                for_each_reflog(fsck_handle_reflog, NULL);
@@ -512,14 +515,13 @@ static void fsck_object_dir(const char *path)
 
 static int fsck_head_link(void)
 {
-       unsigned char sha1[20];
        int flag;
        int null_is_error = 0;
-       const char *head_points_at = resolve_ref("HEAD", sha1, 0, &flag);
 
        if (verbose)
                fprintf(stderr, "Checking HEAD link\n");
 
+       head_points_at = resolve_ref("HEAD", head_sha1, 0, &flag);
        if (!head_points_at)
                return error("Invalid HEAD");
        if (!strcmp(head_points_at, "HEAD"))
@@ -528,7 +530,7 @@ static int fsck_head_link(void)
        else if (prefixcmp(head_points_at, "refs/heads/"))
                return error("HEAD points to something strange (%s)",
                             head_points_at);
-       if (is_null_sha1(sha1)) {
+       if (is_null_sha1(head_sha1)) {
                if (null_is_error)
                        return error("HEAD: detached HEAD points at nothing");
                fprintf(stderr, "notice: HEAD points to an unborn branch (%s)\n",
@@ -584,6 +586,7 @@ static struct option fsck_opts[] = {
 int cmd_fsck(int argc, const char **argv, const char *prefix)
 {
        int i, heads;
+       struct alternate_object_database *alt;
 
        errors_found = 0;
 
@@ -595,17 +598,19 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
 
        fsck_head_link();
        fsck_object_dir(get_object_directory());
+
+       prepare_alt_odb();
+       for (alt = alt_odb_list; alt; alt = alt->next) {
+               char namebuf[PATH_MAX];
+               int namelen = alt->name - alt->base;
+               memcpy(namebuf, alt->base, namelen);
+               namebuf[namelen - 1] = 0;
+               fsck_object_dir(namebuf);
+       }
+
        if (check_full) {
-               struct alternate_object_database *alt;
                struct packed_git *p;
-               prepare_alt_odb();
-               for (alt = alt_odb_list; alt; alt = alt->next) {
-                       char namebuf[PATH_MAX];
-                       int namelen = alt->name - alt->base;
-                       memcpy(namebuf, alt->base, namelen);
-                       namebuf[namelen - 1] = 0;
-                       fsck_object_dir(namebuf);
-               }
+
                prepare_packed_git();
                for (p = packed_git; p; p = p->next)
                        /* verify gives error messages itself */
@@ -624,8 +629,9 @@ int cmd_fsck(int argc, const char **argv, const char *prefix)
        heads = 0;
        for (i = 0; i < argc; i++) {
                const char *arg = argv[i];
-               if (!get_sha1(arg, head_sha1)) {
-                       struct object *obj = lookup_object(head_sha1);
+               unsigned char sha1[20];
+               if (!get_sha1(arg, sha1)) {
+                       struct object *obj = lookup_object(sha1);
 
                        /* Error is printed by lookup_object(). */
                        if (!obj)