[PATCH] Install git-verify-tag-script

[git.git] / pull.c

diff --git a/pull.c b/pull.c
index bbef245..ed3078e 100644 (file)
--- a/pull.c
+++ b/pull.c
@@ -3,18 +3,53 @@
 #include "cache.h"
 #include "commit.h"
 #include "tree.h"
+#include "tag.h"
+#include "blob.h"
+#include "refs.h"
+
+const char *write_ref = NULL;
+
+const unsigned char *current_ref = NULL;
 
 int get_tree = 0;
 int get_history = 0;
 int get_all = 0;
+int get_verbosely = 0;
+static unsigned char current_commit_sha1[20];
+
+static const char commitS[] = "commit";
+static const char treeS[] = "tree";
+static const char blobS[] = "blob";
+
+void pull_say(const char *fmt, const char *hex) {
+       if (get_verbosely)
+               fprintf(stderr, fmt, hex);
+}
 
-static int make_sure_we_have_it(unsigned char *sha1)
+static void report_missing(const char *what, const unsigned char *missing)
 {
-       if (has_sha1_file(sha1))
-               return 0;
-       return fetch(sha1);     
+       char missing_hex[41];
+
+       strcpy(missing_hex, sha1_to_hex(missing));;
+       fprintf(stderr,
+               "Cannot obtain needed %s %s\nwhile processing commit %s.\n",
+               what, missing_hex, sha1_to_hex(current_commit_sha1));
 }
 
+static int make_sure_we_have_it(const char *what, unsigned char *sha1)
+{
+       int status = 0;
+
+       if (!has_sha1_file(sha1)) {
+               status = fetch(sha1);
+               if (status && what)
+                       report_missing(what, sha1);
+       }
+       return status;
+}
+
+static int process_unknown(unsigned char *sha1);
+
 static int process_tree(unsigned char *sha1)
 {
        struct tree *tree = lookup_tree(sha1);
@@ -24,7 +59,8 @@ static int process_tree(unsigned char *sha1)
                return -1;
 
        for (entries = tree->entries; entries; entries = entries->next) {
-               if (make_sure_we_have_it(entries->item.tree->object.sha1))
+               const char *what = entries->directory ? treeS : blobS;
+               if (make_sure_we_have_it(what, entries->item.tree->object.sha1))
                        return -1;
                if (entries->directory) {
                        if (process_tree(entries->item.tree->object.sha1))
@@ -38,14 +74,14 @@ static int process_commit(unsigned char *sha1)
 {
        struct commit *obj = lookup_commit(sha1);
 
-       if (make_sure_we_have_it(sha1))
+       if (make_sure_we_have_it(commitS, sha1))
                return -1;
 
        if (parse_commit(obj))
                return -1;
 
        if (get_tree) {
-               if (make_sure_we_have_it(obj->tree->object.sha1))
+               if (make_sure_we_have_it(treeS, obj->tree->object.sha1))
                        return -1;
                if (process_tree(obj->tree->object.sha1))
                        return -1;
@@ -57,7 +93,8 @@ static int process_commit(unsigned char *sha1)
                for (; parents; parents = parents->next) {
                        if (has_sha1_file(parents->item->object.sha1))
                                continue;
-                       if (make_sure_we_have_it(parents->item->object.sha1)) {
+                       if (make_sure_we_have_it(NULL,
+                                                parents->item->object.sha1)) {
                                /* The server might not have it, and
                                 * we don't mind. 
                                 */
@@ -65,20 +102,77 @@ static int process_commit(unsigned char *sha1)
                        }
                        if (process_commit(parents->item->object.sha1))
                                return -1;
+                       memcpy(current_commit_sha1, sha1, 20);
                }
        }
        return 0;
 }
 
+static int process_tag(unsigned char *sha1)
+{
+       struct tag *obj = lookup_tag(sha1);
+
+       if (parse_tag(obj))
+               return -1;
+       return process_unknown(obj->tagged->sha1);
+}
+
+static int process_unknown(unsigned char *sha1)
+{
+       struct object *obj;
+       if (make_sure_we_have_it("object", sha1))
+               return -1;
+       obj = parse_object(sha1);
+       if (!obj)
+               return error("Unable to parse object %s", sha1_to_hex(sha1));
+       if (obj->type == commit_type)
+               return process_commit(sha1);
+       if (obj->type == tree_type)
+               return process_tree(sha1);
+       if (obj->type == blob_type)
+               return 0;
+       if (obj->type == tag_type)
+               return process_tag(sha1);
+       return error("Unable to determine requirement of type %s for %s",
+                    obj->type, sha1_to_hex(sha1));
+}
+
+static int interpret_target(char *target, unsigned char *sha1)
+{
+       if (!get_sha1_hex(target, sha1))
+               return 0;
+       if (!check_ref_format(target)) {
+               if (!fetch_ref(target, sha1)) {
+                       return 0;
+               }
+       }
+       return -1;
+}
+
+
 int pull(char *target)
 {
-       int retval;
        unsigned char sha1[20];
-       retval = get_sha1_hex(target, sha1);
-       if (retval)
-               return retval;
-       retval = make_sure_we_have_it(sha1);
-       if (retval)
-               return retval;
-       return process_commit(sha1);
+       int fd = -1;
+
+       if (write_ref && current_ref) {
+               fd = lock_ref_sha1(write_ref, current_ref);
+               if (fd < 0)
+                       return -1;
+       }
+
+       if (interpret_target(target, sha1))
+               return error("Could not interpret %s as something to pull",
+                            target);
+       if (process_unknown(sha1))
+               return -1;
+       
+       if (write_ref) {
+               if (current_ref) {
+                       write_ref_sha1(write_ref, fd, sha1);
+               } else {
+                       write_ref_sha1_unlocked(write_ref, sha1);
+               }
+       }
+       return 0;
 }