Document git-clone --use-separate-remote

[git.git] / builtin-tar-tree.c

diff --git a/builtin-tar-tree.c b/builtin-tar-tree.c
index 6ada04c..7663b9b 100644 (file)
--- a/builtin-tar-tree.c
+++ b/builtin-tar-tree.c
@@ -8,11 +8,13 @@
 #include "strbuf.h"
 #include "tar.h"
 #include "builtin.h"
+#include "pkt-line.h"
 
 #define RECORDSIZE     (512)
 #define BLOCKSIZE      (RECORDSIZE * 20)
 
-static const char tar_tree_usage[] = "git-tar-tree <key> [basedir]";
+static const char tar_tree_usage[] =
+"git-tar-tree [--remote=<repo>] <ent> [basedir]";
 
 static char block[BLOCKSIZE];
 static unsigned long offset;
@@ -166,8 +168,9 @@ static int get_path_prefix(const struct strbuf *path, int maxlen)
        int i = path->len;
        if (i > maxlen)
                i = maxlen;
-       while (i > 0 && path->buf[i] != '/')
+       do {
                i--;
+       } while (i > 0 && path->buf[i] != '/');
        return i;
 }
 
@@ -269,30 +272,25 @@ static void write_global_extended_header(const unsigned char *sha1)
 static void traverse_tree(struct tree_desc *tree, struct strbuf *path)
 {
        int pathlen = path->len;
+       struct name_entry entry;
 
-       while (tree->size) {
-               const char *name;
-               const unsigned char *sha1;
-               unsigned mode;
+       while (tree_entry(tree, &entry)) {
                void *eltbuf;
                char elttype[20];
                unsigned long eltsize;
 
-               sha1 = tree_entry_extract(tree, &name, &mode);
-               update_tree_entry(tree);
-
-               eltbuf = read_sha1_file(sha1, elttype, &eltsize);
+               eltbuf = read_sha1_file(entry.sha1, elttype, &eltsize);
                if (!eltbuf)
-                       die("cannot read %s", sha1_to_hex(sha1));
+                       die("cannot read %s", sha1_to_hex(entry.sha1));
 
                path->len = pathlen;
-               strbuf_append_string(path, name);
-               if (S_ISDIR(mode))
+               strbuf_append_string(path, entry.path);
+               if (S_ISDIR(entry.mode))
                        strbuf_append_string(path, "/");
 
-               write_entry(sha1, path, mode, eltbuf, eltsize);
+               write_entry(entry.sha1, path, entry.mode, eltbuf, eltsize);
 
-               if (S_ISDIR(mode)) {
+               if (S_ISDIR(entry.mode)) {
                        struct tree_desc subtree;
                        subtree.buf = eltbuf;
                        subtree.size = eltsize;
@@ -302,7 +300,7 @@ static void traverse_tree(struct tree_desc *tree, struct strbuf *path)
        }
 }
 
-int cmd_tar_tree(int argc, const char **argv, char** envp)
+static int generate_tar(int argc, const char **argv, char** envp)
 {
        unsigned char sha1[20], tree_sha1[20];
        struct commit *commit;
@@ -349,3 +347,58 @@ int cmd_tar_tree(int argc, const char **argv, char** envp)
        free(current_path.buf);
        return 0;
 }
+
+static const char *exec = "git-upload-tar";
+
+static int remote_tar(int argc, const char **argv)
+{
+       int fd[2], ret, len;
+       pid_t pid;
+       char buf[1024];
+       char *url;
+
+       if (argc < 3 || 4 < argc)
+               usage(tar_tree_usage);
+
+       /* --remote=<repo> */
+       url = strdup(argv[1]+9);
+       pid = git_connect(fd, url, exec);
+       if (pid < 0)
+               return 1;
+
+       packet_write(fd[1], "want %s\n", argv[2]);
+       if (argv[3])
+               packet_write(fd[1], "base %s\n", argv[3]);
+       packet_flush(fd[1]);
+
+       len = packet_read_line(fd[0], buf, sizeof(buf));
+       if (!len)
+               die("git-tar-tree: expected ACK/NAK, got EOF");
+       if (buf[len-1] == '\n')
+               buf[--len] = 0;
+       if (strcmp(buf, "ACK")) {
+               if (5 < len && !strncmp(buf, "NACK ", 5))
+                       die("git-tar-tree: NACK %s", buf + 5);
+               die("git-tar-tree: protocol error");
+       }
+       /* expect a flush */
+       len = packet_read_line(fd[0], buf, sizeof(buf));
+       if (len)
+               die("git-tar-tree: expected a flush");
+
+       /* Now, start reading from fd[0] and spit it out to stdout */
+       ret = copy_fd(fd[0], 1);
+       close(fd[0]);
+
+       ret |= finish_connect(pid);
+       return !!ret;
+}
+
+int cmd_tar_tree(int argc, const char **argv, char **envp)
+{
+       if (argc < 2)
+               usage(tar_tree_usage);
+       if (!strncmp("--remote=", argv[1], 9))
+               return remote_tar(argc, argv);
+       return generate_tar(argc, argv, envp);
+}