Make git-branch a builtin

diff --git a/http-fetch.c b/http-fetch.c
index fac17607b442c5bf1e1d21c27ae9a2b6c473358c..bc74f30f76fe0200f6c7ecc215ee1cd9211670f4 100644 (file)
--- a/http-fetch.c
+++ b/http-fetch.c
@@ -144,6 +144,19 @@ static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
        return size;
 }
 
+static int missing__target(int code, int result)
+{
+       return  /* file:// URL -- do we ever use one??? */
+               (result == CURLE_FILE_COULDNT_READ_FILE) ||
+               /* http:// and https:// URL */
+               (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
+               /* ftp:// URL */
+               (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
+               ;
+}
+
+#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
+
 static void fetch_alternates(const char *base);
 
 static void process_object_response(void *callback_data);
@@ -323,8 +336,7 @@ static void process_object_response(void *callback_data)
        obj_req->state = COMPLETE;
 
        /* Use alternates if necessary */
-       if (obj_req->http_code == 404 ||
-           obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+       if (missing_target(obj_req)) {
                fetch_alternates(alt->base);
                if (obj_req->repo->next != NULL) {
                        obj_req->repo =
@@ -537,8 +549,7 @@ static void process_alternates_response(void *callback_data)
                        return;
                }
        } else if (slot->curl_result != CURLE_OK) {
-               if (slot->http_code != 404 &&
-                   slot->curl_result != CURLE_FILE_COULDNT_READ_FILE) {
+               if (!missing_target(slot)) {
                        got_alternates = -1;
                        return;
                }
@@ -559,9 +570,36 @@ static void process_alternates_response(void *callback_data)
                        char *target = NULL;
                        char *path;
                        if (data[i] == '/') {
-                               serverlen = strchr(base + 8, '/') - base;
-                               okay = 1;
+                               /* This counts
+                                * http://git.host/pub/scm/linux.git/
+                                * -----------here^
+                                * so memcpy(dst, base, serverlen) will
+                                * copy up to "...git.host".
+                                */
+                               const char *colon_ss = strstr(base,"://");
+                               if (colon_ss) {
+                                       serverlen = (strchr(colon_ss + 3, '/')
+                                                    - base);
+                                       okay = 1;
+                               }
                        } else if (!memcmp(data + i, "../", 3)) {
+                               /* Relative URL; chop the corresponding
+                                * number of subpath from base (and ../
+                                * from data), and concatenate the result.
+                                *
+                                * The code first drops ../ from data, and
+                                * then drops one ../ from data and one path
+                                * from base.  IOW, one extra ../ is dropped
+                                * from data than path is dropped from base.
+                                *
+                                * This is not wrong.  The alternate in
+                                *     http://git.host/pub/scm/linux.git/
+                                * to borrow from
+                                *     http://git.host/pub/scm/linus.git/
+                                * is ../../linus.git/objects/.  You need
+                                * two ../../ to borrow from your direct
+                                * neighbour.
+                                */
                                i += 3;
                                serverlen = strlen(base);
                                while (i + 2 < posn &&
@@ -583,11 +621,13 @@ static void process_alternates_response(void *callback_data)
                                        okay = 1;
                                }
                        }
-                       /* skip 'objects' at end */
+                       /* skip "objects\n" at end */
                        if (okay) {
                                target = xmalloc(serverlen + posn - i - 6);
-                               strlcpy(target, base, serverlen);
-                               strlcpy(target + serverlen, data + i, posn - i - 6);
+                               memcpy(target, base, serverlen);
+                               memcpy(target + serverlen, data + i,
+                                      posn - i - 7);
+                               target[serverlen + posn - i - 7] = 0;
                                if (get_verbosely)
                                        fprintf(stderr,
                                                "Also look at %s\n", target);
@@ -912,8 +952,7 @@ static int fetch_indices(struct alt_base *repo)
        if (start_active_slot(slot)) {
                run_active_slot(slot);
                if (results.curl_result != CURLE_OK) {
-                       if (results.http_code == 404 ||
-                           results.curl_result == CURLE_FILE_COULDNT_READ_FILE) {
+                       if (missing_target(&results)) {
                                repo->got_indices = 1;
                                free(buffer.buffer);
                                return 0;
@@ -1094,8 +1133,7 @@ static int fetch_object(struct alt_base *repo, unsigned char *sha1)
                ret = error("Request for %s aborted", hex);
        } else if (obj_req->curl_result != CURLE_OK &&
                   obj_req->http_code != 416) {
-               if (obj_req->http_code == 404 ||
-                   obj_req->curl_result == CURLE_FILE_COULDNT_READ_FILE)
+               if (missing_target(obj_req))
                        ret = -1; /* Be silent, it is probably in a pack. */
                else
                        ret = error("%s (curl_result = %d, http_code = %ld, sha1 = %s)",