Add stupid "git export" thing, which can export a git archive

[git.git] / revision.h

diff --git a/revision.h b/revision.h
index 4f140ca..7791a72 100644 (file)
--- a/revision.h
+++ b/revision.h
@@ -25,6 +25,7 @@ struct revision {
        unsigned char sha1[20];
        unsigned long date;
        struct parent *parent;
+       char tag[1];
 };
 
 static struct revision **revs;
@@ -51,13 +52,17 @@ static int find_rev(unsigned char *sha1)
        return -first-1;
 }
 
-static struct revision *lookup_rev(unsigned char *sha1)
+static struct revision *lookup_rev(unsigned char *sha1, const char *tag)
 {
        int pos = find_rev(sha1);
        struct revision *n;
 
-       if (pos >= 0)
-               return revs[pos];
+       if (pos >= 0) {
+               n = revs[pos];
+               if (strcmp(n->tag, tag))
+                       error("expected tag %s on object %s: got %s", tag, sha1_to_hex(sha1), n->tag);
+               return n;
+       }
        
        pos = -pos-1;
 
@@ -65,11 +70,12 @@ static struct revision *lookup_rev(unsigned char *sha1)
                rev_allocs = alloc_nr(rev_allocs);
                revs = realloc(revs, rev_allocs * sizeof(struct revision *));
        }
-       n = malloc(sizeof(struct revision));
+       n = malloc(sizeof(struct revision) + strlen(tag));
 
        n->flags = 0;
        memcpy(n->sha1, sha1, 20);
        n->parent = NULL;
+       strcpy(n->tag, tag);
 
        /* Insert it into the right place */
        memmove(revs + pos + 1, revs + pos, (nr_revs - pos) * sizeof(struct revision *));
@@ -79,9 +85,9 @@ static struct revision *lookup_rev(unsigned char *sha1)
        return n;
 }
 
-static struct revision *add_relationship(struct revision *rev, unsigned char *needs)
+static struct revision *add_relationship(struct revision *rev, unsigned char *needs, const char *tag)
 {
-       struct revision *parent_rev = lookup_rev(needs);
+       struct revision *parent_rev = lookup_rev(needs, tag);
        struct parent **pp = &rev->parent, *p;
 
        while ((p = *pp) != NULL) {
@@ -97,18 +103,62 @@ static struct revision *add_relationship(struct revision *rev, unsigned char *ne
        return parent_rev;
 }
 
-static void mark_reachable(struct revision *rev)
+static void mark_reachable(struct revision *rev, unsigned int mask)
 {
        struct parent *p = rev->parent;
 
        /* If we've been here already, don't bother */
-       if (rev->flags & REACHABLE)
+       if (rev->flags & mask)
                return;
-       rev->flags |= REACHABLE | USED;
+       rev->flags |= mask | USED;
        while (p) {
-               mark_reachable(p->parent);
+               mark_reachable(p->parent, mask);
                p = p->next;
        }
 }
 
+static unsigned long parse_commit_date(const char *buf)
+{
+       unsigned long date;
+
+       if (memcmp(buf, "author", 6))
+               return 0;
+       while (*buf++ != '\n')
+               /* nada */;
+       if (memcmp(buf, "committer", 9))
+               return 0;
+       while (*buf++ != '>')
+               /* nada */;
+       date = strtoul(buf, NULL, 10);
+       if (date == ULONG_MAX)
+               date = 0;
+       return date;
+}
+
+static struct revision * parse_commit(unsigned char *sha1)
+{
+       struct revision *rev = lookup_rev(sha1, "commit");
+
+       if (!(rev->flags & SEEN)) {
+               void *buffer, *bufptr;
+               unsigned long size;
+               char type[20];
+               unsigned char parent[20];
+
+               rev->flags |= SEEN;
+               buffer = bufptr = read_sha1_file(sha1, type, &size);
+               if (!buffer || strcmp(type, "commit"))
+                       die("%s is not a commit object", sha1_to_hex(sha1));
+               bufptr += 46; /* "tree " + "hex sha1" + "\n" */
+               while (!memcmp(bufptr, "parent ", 7) && !get_sha1_hex(bufptr+7, parent)) {
+                       add_relationship(rev, parent, "commit");
+                       parse_commit(parent);
+                       bufptr += 48;   /* "parent " + "hex sha1" + "\n" */
+               }
+               rev->date = parse_commit_date(bufptr);
+               free(buffer);
+       }
+       return rev;
+}
+
 #endif /* REVISION_H */