git-pack-objects: add "--stdout" flag to write the pack file to stdout

[git.git] / pack-objects.c

diff --git a/pack-objects.c b/pack-objects.c
index 62ed265437bd7430ca9645151a2aa2d7c3aa4062..e9764604f6f17f4eb018b4fd7247550e90583f8c 100644 (file)
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -4,23 +4,23 @@
 #include "delta.h"
 #include "csum-file.h"
 
-static const char pack_usage[] = "git-pack-objects [--window=N] [--depth=N] base-name < object-list";
-
-enum object_type {
-       OBJ_NONE,
-       OBJ_COMMIT,
-       OBJ_TREE,
-       OBJ_BLOB,
-       OBJ_DELTA
-};
+static const char pack_usage[] = "git-pack-objects [--window=N] [--depth=N] {--stdout | base-name} < object-list";
 
+/*
+ * The object type is a single-character shorthand:
+ *  - 'C' for "Commit"
+ *  - 'T' for "Tree"
+ *  - 'B' for "Blob"
+ *  - 'G' for "taG"
+ *  - 'D' for "Delta"
+ */
 struct object_entry {
        unsigned char sha1[20];
        unsigned long size;
        unsigned long offset;
        unsigned int depth;
        unsigned int hash;
-       enum object_type type;
+       unsigned char type;
        unsigned long delta_size;
        struct object_entry *delta;
 };
@@ -67,7 +67,7 @@ static unsigned long write_object(struct sha1file *f, struct object_entry *entry
         * length, except for deltas that has the 20 bytes of delta sha
         * instead.
         */
-       header[0] = ".CTB"[entry->type];
+       header[0] = entry->type;
        hdrlen = 5;
        if (entry->delta) {
                header[0] = 'D';
@@ -87,10 +87,14 @@ static unsigned long write_object(struct sha1file *f, struct object_entry *entry
 static void write_pack_file(void)
 {
        int i;
-       struct sha1file *f = sha1create("%s.%s", base_name, "pack");
+       struct sha1file *f;
        unsigned long offset = 0;
        unsigned long mb;
 
+       if (!base_name)
+               f = sha1fd(1, "<stdout>");
+       else
+               f = sha1create("%s.%s", base_name, "pack");
        for (i = 0; i < nr_objects; i++) {
                struct object_entry *entry = objects + i;
                entry->offset = offset;
@@ -164,11 +168,13 @@ static void check_object(struct object_entry *entry)
 
        if (!sha1_object_info(entry->sha1, type, &entry->size)) {
                if (!strcmp(type, "commit")) {
-                       entry->type = OBJ_COMMIT;
+                       entry->type = 'C';
                } else if (!strcmp(type, "tree")) {
-                       entry->type = OBJ_TREE;
+                       entry->type = 'T';
                } else if (!strcmp(type, "blob")) {
-                       entry->type = OBJ_BLOB;
+                       entry->type = 'B';
+               } else if (!strcmp(type, "tag")) {
+                       entry->type = 'G';
                } else
                        die("unable to pack object %s of type %s",
                            sha1_to_hex(entry->sha1), type);
@@ -332,7 +338,7 @@ static void find_deltas(struct object_entry **list, int window, int depth)
 int main(int argc, char **argv)
 {
        char line[PATH_MAX + 20];
-       int window = 10, depth = 10;
+       int window = 10, depth = 10, pack_to_stdout = 0;
        int i;
 
        for (i = 1; i < argc; i++) {
@@ -353,6 +359,10 @@ int main(int argc, char **argv)
                                        usage(pack_usage);
                                continue;
                        }
+                       if (!strcmp("--stdout", arg)) {
+                               pack_to_stdout = 1;
+                               continue;
+                       }
                        usage(pack_usage);
                }
                if (base_name)
@@ -360,7 +370,7 @@ int main(int argc, char **argv)
                base_name = arg;
        }
 
-       if (!base_name)
+       if (pack_to_stdout != !base_name)
                usage(pack_usage);
 
        while (fgets(line, sizeof(line), stdin) != NULL) {
@@ -382,7 +392,7 @@ int main(int argc, char **argv)
        }
        get_object_details();
 
-       printf("Packing %d objects\n", nr_objects);
+       fprintf(stderr, "Packing %d objects\n", nr_objects);
 
        sorted_by_sha = create_sorted_list(sha1_sort);
        sorted_by_type = create_sorted_list(type_size_sort);
@@ -390,6 +400,7 @@ int main(int argc, char **argv)
                find_deltas(sorted_by_type, window+1, depth);
 
        write_pack_file();
-       write_index_file();
+       if (!pack_to_stdout)
+               write_index_file();
        return 0;
 }