Builtin git-commit-tree.

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

diff --git a/builtin-commit-tree.c b/builtin-commit-tree.c
new file mode 100644 (file)
index 0000000..ec082bf
--- /dev/null
+++ b/builtin-commit-tree.c
@@ -0,0 +1,140 @@
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ */
+#include "cache.h"
+#include "commit.h"
+#include "tree.h"
+#include "builtin.h"
+
+#define BLOCKING (1ul << 14)
+
+/*
+ * FIXME! Share the code with "write-tree.c"
+ */
+static void init_buffer(char **bufp, unsigned int *sizep)
+{
+       char *buf = xmalloc(BLOCKING);
+       *sizep = 0;
+       *bufp = buf;
+}
+
+static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
+{
+       char one_line[2048];
+       va_list args;
+       int len;
+       unsigned long alloc, size, newsize;
+       char *buf;
+
+       va_start(args, fmt);
+       len = vsnprintf(one_line, sizeof(one_line), fmt, args);
+       va_end(args);
+       size = *sizep;
+       newsize = size + len;
+       alloc = (size + 32767) & ~32767;
+       buf = *bufp;
+       if (newsize > alloc) {
+               alloc = (newsize + 32767) & ~32767;
+               buf = xrealloc(buf, alloc);
+               *bufp = buf;
+       }
+       *sizep = newsize;
+       memcpy(buf + size, one_line, len);
+}
+
+static void check_valid(unsigned char *sha1, const char *expect)
+{
+       char type[20];
+
+       if (sha1_object_info(sha1, type, NULL))
+               die("%s is not a valid object", sha1_to_hex(sha1));
+       if (expect && strcmp(type, expect))
+               die("%s is not a valid '%s' object", sha1_to_hex(sha1),
+                   expect);
+}
+
+/*
+ * Having more than two parents is not strange at all, and this is
+ * how multi-way merges are represented.
+ */
+#define MAXPARENT (16)
+static unsigned char parent_sha1[MAXPARENT][20];
+
+static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
+
+static int new_parent(int idx)
+{
+       int i;
+       unsigned char *sha1 = parent_sha1[idx];
+       for (i = 0; i < idx; i++) {
+               if (!memcmp(parent_sha1[i], sha1, 20)) {
+                       error("duplicate parent %s ignored", sha1_to_hex(sha1));
+                       return 0;
+               }
+       }
+       return 1;
+}
+
+int cmd_commit_tree(int argc, const char **argv, char **envp)
+{
+       int i;
+       int parents = 0;
+       unsigned char tree_sha1[20];
+       unsigned char commit_sha1[20];
+       char comment[1000];
+       char *buffer;
+       unsigned int size;
+
+       setup_ident();
+       setup_git_directory();
+
+       git_config(git_default_config);
+
+       if (argc < 2)
+               usage(commit_tree_usage);
+       if (get_sha1(argv[1], tree_sha1))
+               die("Not a valid object name %s", argv[1]);
+
+       check_valid(tree_sha1, tree_type);
+       for (i = 2; i < argc; i += 2) {
+               const char *a, *b;
+               a = argv[i]; b = argv[i+1];
+               if (!b || strcmp(a, "-p"))
+                       usage(commit_tree_usage);
+               if (get_sha1(b, parent_sha1[parents]))
+                       die("Not a valid object name %s", b);
+               check_valid(parent_sha1[parents], commit_type);
+               if (new_parent(parents))
+                       parents++;
+       }
+       if (!parents)
+               fprintf(stderr, "Committing initial tree %s\n", argv[1]);
+
+       init_buffer(&buffer, &size);
+       add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
+
+       /*
+        * NOTE! This ordering means that the same exact tree merged with a
+        * different order of parents will be a _different_ changeset even
+        * if everything else stays the same.
+        */
+       for (i = 0; i < parents; i++)
+               add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
+
+       /* Person/date information */
+       add_buffer(&buffer, &size, "author %s\n", git_author_info(1));
+       add_buffer(&buffer, &size, "committer %s\n\n", git_committer_info(1));
+
+       /* And add the comment */
+       while (fgets(comment, sizeof(comment), stdin) != NULL)
+               add_buffer(&buffer, &size, "%s", comment);
+
+       if (!write_sha1_file(buffer, size, commit_type, commit_sha1)) {
+               printf("%s\n", sha1_to_hex(commit_sha1));
+               return 0;
+       }
+       else
+               return 1;
+}