Adapt tutorial to cygwin and add test case

diff --git a/write-tree.c b/write-tree.c
index 19b6ee5ea3bf17b81a22c0f76ae5da85998552d3..2b2c6b77afd53870423d4bad9191ed669bc55660 100644 (file)
--- a/write-tree.c
+++ b/write-tree.c
@@ -5,16 +5,17 @@
  */
 #include "cache.h"
 
+static int missing_ok = 0;
+
 static int check_valid_sha1(unsigned char *sha1)
 {
-       char *filename = sha1_file_name(sha1);
        int ret;
 
        /* If we were anal, we'd check that the sha1 of the contents actually matches */
-       ret = access(filename, R_OK);
-       if (ret)
-               perror(filename);
-       return ret;
+       ret = has_sha1_file(sha1);
+       if (ret == 0)
+               perror(sha1_file_name(sha1));
+       return ret ? 0 : -1;
 }
 
 static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
@@ -30,7 +31,7 @@ static int write_tree(struct cache_entry **cachep, int maxentries, const char *b
        offset = 0;
 
        nr = 0;
-       do {
+       while (nr < maxentries) {
                struct cache_entry *ce = cachep[nr];
                const char *pathname = ce->name, *filename, *dirname;
                int pathlen = ce_namelen(ce), entrylen;
@@ -62,7 +63,7 @@ static int write_tree(struct cache_entry **cachep, int maxentries, const char *b
                        sha1 = subdir_sha1;
                }
 
-               if (check_valid_sha1(sha1) < 0)
+               if (!missing_ok && check_valid_sha1(sha1) < 0)
                        exit(1);
 
                entrylen = pathlen - baselen;
@@ -75,7 +76,7 @@ static int write_tree(struct cache_entry **cachep, int maxentries, const char *b
                memcpy(buffer + offset, sha1, 20);
                offset += 20;
                nr++;
-       } while (nr < maxentries);
+       }
 
        write_sha1_file(buffer, offset, "tree", returnsha1);
        free(buffer);
@@ -87,9 +88,19 @@ int main(int argc, char **argv)
        int i, funny;
        int entries = read_cache();
        unsigned char sha1[20];
+       
+       if (argc == 2) {
+               if (!strcmp(argv[1], "--missing-ok"))
+                       missing_ok = 1;
+               else
+                       die("unknown option %s", argv[1]);
+       }
+       
+       if (argc > 2)
+               die("too many options");
 
-       if (entries <= 0)
-               die("write-tree: no cache contents to write");
+       if (entries < 0)
+               die("git-write-tree: error reading cache");
 
        /* Verify that the tree is merged */
        funny = 0;
@@ -104,7 +115,7 @@ int main(int argc, char **argv)
                }
        }
        if (funny)
-               die("write-tree: not able to write tree");
+               die("git-write-tree: not able to write tree");
 
        /* Also verify that the cache does not have path and path/file
         * at the same time.  At this point we know the cache has only
@@ -131,11 +142,11 @@ int main(int argc, char **argv)
                }
        }
        if (funny)
-               die("write-tree: not able to write tree");
+               die("git-write-tree: not able to write tree");
 
        /* Ok, write it out */
        if (write_tree(active_cache, entries, "", 0, sha1) != entries)
-               die("write-tree: internal error");
+               die("git-write-tree: internal error");
        printf("%s\n", sha1_to_hex(sha1));
        return 0;
 }