repo_tree parses SVN revisions to build a Git objects, and use
fast_export to emit them so they can be imported into the Git object
store via a fast-import. Taken directly from David Michael Barr's
svn-dump-fast-export repository.
Signed-off-by: Ramkumar Ramachandra <artagnon@xxxxxxxxx>
---
vcs-svn/fast_export.c | 61 +++++++++
vcs-svn/fast_export.h | 17 +++
vcs-svn/repo_tree.c | 333 +++++++++++++++++++++++++++++++++++++++++++++++++
vcs-svn/repo_tree.h | 31 +++++
4 files changed, 442 insertions(+), 0 deletions(-)
create mode 100644 vcs-svn/fast_export.c
create mode 100644 vcs-svn/fast_export.h
create mode 100644 vcs-svn/repo_tree.c
create mode 100644 vcs-svn/repo_tree.h
diff --git a/vcs-svn/fast_export.c b/vcs-svn/fast_export.c
new file mode 100644
index 0000000..f4d9ab7
--- /dev/null
+++ b/vcs-svn/fast_export.c
@@ -0,0 +1,61 @@
+#include <string.h>
+
+#include "fast_export.h"
+#include "line_buffer.h"
+#include "repo_tree.h"
+#include "string_pool.h"
+
+#define MAX_GITSVN_LINE_LEN 4096
+
+void fast_export_delete(uint32_t depth, uint32_t *path)
+{
+ putchar('D');
+ putchar(' ');
+ pool_print_seq(depth, path, '/', stdout);
+ putchar('\n');
+}
+
+void fast_export_modify(uint32_t depth, uint32_t *path, uint32_t mode,
+ uint32_t mark)
+{
+ printf("M %06o :%d ", mode, mark);
+ pool_print_seq(depth, path, '/', stdout);
+ putchar('\n');
+}
+
+static char gitsvnline[MAX_GITSVN_LINE_LEN];
+void fast_export_commit(uint32_t revision, char *author, char *log,
+ char *uuid, char *url, time_t timestamp)
+{
+ if (!author)
+ author = "nobody";
+ if (!log)
+ log = "";
+ if (uuid && url) {
+ snprintf(gitsvnline, MAX_GITSVN_LINE_LEN, "\n\ngit-svn-id: %s@%d %s\n",
+ url, revision, uuid);
+ } else {
+ *gitsvnline = '\0';
+ }
+ printf("commit refs/heads/master\nmark :%d\n", revision);
+ printf("committer %s <%s@%s> %ld +0000\n",
+ author, author, uuid ? uuid : "local", timestamp);
+ printf("data %ld\n%s%s\n",
+ strlen(log) + strlen(gitsvnline), log, gitsvnline);
+ repo_diff(revision - 1, revision);
+ fputc('\n', stdout);
+
+ printf("progress Imported commit %d.\n\n", revision);
+}
+
+void fast_export_blob(uint32_t mode, uint32_t mark, uint32_t len)
+{
+ if (mode == REPO_MODE_LNK) {
+ /* svn symlink blobs start with "link " */
+ buffer_skip_bytes(5);
+ len -= 5;
+ }
+ printf("blob\nmark :%d\ndata %d\n", mark, len);
+ buffer_copy_bytes(len);
+ fputc('\n', stdout);
+}
diff --git a/vcs-svn/fast_export.h b/vcs-svn/fast_export.h
new file mode 100644
index 0000000..e84144e
--- /dev/null
+++ b/vcs-svn/fast_export.h
@@ -0,0 +1,17 @@
+#ifndef FAST_EXPORT_H_
+#define FAST_EXPORT_H_
+
+#include <stdint.h>
+#include <time.h>
+
+void fast_export_delete(uint32_t depth, uint32_t *path);
+
+void fast_export_modify(uint32_t depth, uint32_t *path, uint32_t mode,
+ uint32_t mark);
+
+void fast_export_commit(uint32_t revision, char *author, char *log,
+ char *uuid, char *url, time_t timestamp);
+
+void fast_export_blob(uint32_t mode, uint32_t mark, uint32_t len);
+
+#endif
diff --git a/vcs-svn/repo_tree.c b/vcs-svn/repo_tree.c
new file mode 100644
index 0000000..7c4a70f
--- /dev/null
+++ b/vcs-svn/repo_tree.c
@@ -0,0 +1,333 @@
+#include <string.h>
+
+#include "string_pool.h"
+#include "repo_tree.h"
+#include "obj_pool.h"
+#include "fast_export.h"
+
+typedef struct repo_dirent_s repo_dirent_t;
+
+struct repo_dirent_s {
+ uint32_t name_offset;
+ uint32_t mode;
+ uint32_t content_offset;
+};
+
+typedef struct repo_dir_s repo_dir_t;
+
+struct repo_dir_s {
+ uint32_t size;
+ uint32_t first_offset;
+};
+
+typedef struct repo_commit_s repo_commit_t;
+
+struct repo_commit_s {
+ uint32_t mark;
+ uint32_t root_dir_offset;
+};
+
+/* Generate memory pools for commit, dir and dirent */
+obj_pool_gen(commit, repo_commit_t, 4096);
+obj_pool_gen(dir, repo_dir_t, 4096);
+obj_pool_gen(dirent, repo_dirent_t, 4096);
+
+static uint32_t num_dirs_saved = 0;
+static uint32_t num_dirents_saved = 0;
+static uint32_t active_commit = -1;
+
+static repo_dir_t *repo_commit_root_dir(repo_commit_t *commit)
+{
+ return dir_pointer(commit->root_dir_offset);
+}
+
+static repo_dirent_t *repo_first_dirent(repo_dir_t *dir)
+{
+ return dirent_pointer(dir->first_offset);
+}
+
+static int repo_dirent_name_cmp(const void *a, const void *b)
+{
+ return (((repo_dirent_t *) a)->name_offset
+ > ((repo_dirent_t *) b)->name_offset) -
+ (((repo_dirent_t *) a)->name_offset
+ < ((repo_dirent_t *) b)->name_offset);
+}
+
+static repo_dirent_t *repo_dirent_by_name(repo_dir_t *dir,
+ uint32_t name_offset)
+{
+ repo_dirent_t key;
+ if (dir == NULL || dir->size == 0)
+ return NULL;
+ key.name_offset = name_offset;
+ return bsearch(&key, repo_first_dirent(dir), dir->size,
+ sizeof(repo_dirent_t), repo_dirent_name_cmp);
+}
+
+static int repo_dirent_is_dir(repo_dirent_t *dirent)
+{
+ return dirent != NULL && dirent->mode == REPO_MODE_DIR;
+}
+
+static repo_dir_t *repo_dir_from_dirent(repo_dirent_t *dirent)
+{
+ if (!repo_dirent_is_dir(dirent))
+ return NULL;
+ return dir_pointer(dirent->content_offset);
+}
+
+static uint32_t dir_with_dirents_alloc(uint32_t size)
+{
+ uint32_t offset = dir_alloc(1);
+ dir_pointer(offset)->size = size;
+ dir_pointer(offset)->first_offset = dirent_alloc(size);
+ return offset;
+}
+
+static repo_dir_t *repo_clone_dir(repo_dir_t *orig_dir, uint32_t padding)
+{
+ uint32_t orig_o, new_o, dirent_o;
+ orig_o = dir_offset(orig_dir);
+ if (orig_o < num_dirs_saved) {
+ new_o = dir_with_dirents_alloc(orig_dir->size + padding);
+ orig_dir = dir_pointer(orig_o);
+ dirent_o = dir_pointer(new_o)->first_offset;
+ } else {
+ if (padding == 0)
+ return orig_dir;
+ new_o = orig_o;
+ dirent_o = dirent_alloc(orig_dir->size + padding);
+ }
+ memcpy(dirent_pointer(dirent_o), repo_first_dirent(orig_dir),
+ orig_dir->size * sizeof(repo_dirent_t));
+ dir_pointer(new_o)->size = orig_dir->size + padding;
+ dir_pointer(new_o)->first_offset = dirent_o;
+ return dir_pointer(new_o);
+}
+
+static char repo_path_buffer[REPO_MAX_PATH_LEN];
+static repo_dirent_t *repo_read_dirent(uint32_t revision, char *path)
+{
+ char *ctx = NULL;
+ uint32_t name = 0;
+ repo_dir_t *dir = NULL;
+ repo_dirent_t *dirent = NULL;
+ dir = repo_commit_root_dir(commit_pointer(revision));
+ strncpy(repo_path_buffer, path, REPO_MAX_PATH_LEN);
+ repo_path_buffer[REPO_MAX_PATH_LEN - 1] = '\0';
+ path = repo_path_buffer;
+ for (name = pool_tok_r(path, "/", &ctx);
+ ~name; name = pool_tok_r(NULL, "/", &ctx)) {
+ dirent = repo_dirent_by_name(dir, name);
+ if (dirent == NULL) {
+ return NULL;
+ } else if (repo_dirent_is_dir(dirent)) {
+ dir = repo_dir_from_dirent(dirent);
+ } else {
+ break;
+ }
+ }
+ return dirent;
+}
+
+static void
+repo_write_dirent(char *path, uint32_t mode, uint32_t content_offset,
+ uint32_t del)
+{
+ char *ctx;
+ uint32_t name, revision, dirent_o, dir_o, parent_dir_o;
+ repo_dir_t *dir;
+ repo_dirent_t *dirent = NULL;
+ revision = active_commit;
+ dir = repo_commit_root_dir(commit_pointer(revision));
+ dir = repo_clone_dir(dir, 0);
+ commit_pointer(revision)->root_dir_offset = dir_offset(dir);
+ strncpy(repo_path_buffer, path, REPO_MAX_PATH_LEN);
+ repo_path_buffer[REPO_MAX_PATH_LEN - 1] = '\0';
+ path = repo_path_buffer;
+ for (name = pool_tok_r(path, "/", &ctx); ~name;
+ name = pool_tok_r(NULL, "/", &ctx)) {
+ parent_dir_o = dir_offset(dir);
+ dirent = repo_dirent_by_name(dir, name);
+ if (dirent == NULL) {
+ dir = repo_clone_dir(dir, 1);
+ dirent = &repo_first_dirent(dir)[dir->size - 1];
+ dirent->name_offset = name;
+ dirent->mode = REPO_MODE_DIR;
+ qsort(repo_first_dirent(dir), dir->size,
+ sizeof(repo_dirent_t), repo_dirent_name_cmp);
+ dirent = repo_dirent_by_name(dir, name);
+ dir_o = dir_with_dirents_alloc(0);
+ dirent->content_offset = dir_o;
+ dir = dir_pointer(dir_o);
+ } else if ((dir = repo_dir_from_dirent(dirent))) {
+ dirent_o = dirent_offset(dirent);
+ dir = repo_clone_dir(dir, 0);
+ if (dirent_o != ~0)
+ dirent_pointer(dirent_o)->content_offset = dir_offset(dir);
+ } else {
+ dirent->mode = REPO_MODE_DIR;
+ dirent_o = dirent_offset(dirent);
+ dir_o = dir_with_dirents_alloc(0);
+ dirent = dirent_pointer(dirent_o);
+ dir = dir_pointer(dir_o);
+ dirent->content_offset = dir_o;
+ }
+ }
+ if (dirent) {
+ dirent->mode = mode;
+ dirent->content_offset = content_offset;
+ if (del && ~parent_dir_o) {
+ dirent->name_offset = ~0;
+ dir = dir_pointer(parent_dir_o);
+ qsort(repo_first_dirent(dir), dir->size,
+ sizeof(repo_dirent_t), repo_dirent_name_cmp);
+ dir->size--;
+ }
+ }
+}
+
+uint32_t repo_copy(uint32_t revision, char *src, char *dst)
+{
+ uint32_t mode = 0, content_offset = 0;
+ repo_dirent_t *src_dirent;
+ src_dirent = repo_read_dirent(revision, src);
+ if (src_dirent != NULL) {
+ mode = src_dirent->mode;
+ content_offset = src_dirent->content_offset;
+ repo_write_dirent(dst, mode, content_offset, 0);
+ }
+ return mode;
+}
+
+void repo_add(char *path, uint32_t mode, uint32_t blob_mark)
+{
+ repo_write_dirent(path, mode, blob_mark, 0);
+}
+
+uint32_t repo_replace(char *path, uint32_t blob_mark)
+{
+ uint32_t mode = 0;
+ repo_dirent_t *src_dirent;
+ src_dirent = repo_read_dirent(active_commit, path);
+ if (src_dirent != NULL) {
+ mode = src_dirent->mode;
+ repo_write_dirent(path, mode, blob_mark, 0);
+ }
+ return mode;
+}
+
+void repo_modify(char *path, uint32_t mode, uint32_t blob_mark)
+{
+ repo_write_dirent(path, mode, blob_mark, 0);
+}
+
+void repo_delete(char *path)
+{
+ repo_write_dirent(path, 0, 0, 1);
+}
+
+static void
+repo_git_add_r(uint32_t depth, uint32_t *path, repo_dir_t *dir);
+
+static void
+repo_git_add(uint32_t depth, uint32_t *path, repo_dirent_t *dirent)
+{
+ if (repo_dirent_is_dir(dirent)) {
+ repo_git_add_r(depth, path, repo_dir_from_dirent(dirent));
+ } else {
+ fast_export_modify(depth, path, dirent->mode, dirent->content_offset);
+ }
+}
+
+static void
+repo_git_add_r(uint32_t depth, uint32_t *path, repo_dir_t *dir)
+{
+ uint32_t o;
+ repo_dirent_t *de;
+ de = repo_first_dirent(dir);
+ for (o = 0; o < dir->size; o++) {
+ path[depth] = de[o].name_offset;
+ repo_git_add(depth + 1, path, &de[o]);
+ }
+}
+
+static void
+repo_diff_r(uint32_t depth, uint32_t *path, repo_dir_t *dir1,
+ repo_dir_t *dir2)
+{
+ repo_dirent_t *de1, *de2, *max_de1, *max_de2;
+ de1 = repo_first_dirent(dir1);
+ de2 = repo_first_dirent(dir2);
+ max_de1 = &de1[dir1->size];
+ max_de2 = &de2[dir2->size];
+
+ while (de1 < max_de1 && de2 < max_de2) {
+ if (de1->name_offset < de2->name_offset) {
+ path[depth] = (de1++)->name_offset;
+ fast_export_delete(depth + 1, path);
+ } else if (de1->name_offset == de2->name_offset) {
+ path[depth] = de1->name_offset;
+ if (de1->content_offset != de2->content_offset) {
+ if (repo_dirent_is_dir(de1) && repo_dirent_is_dir(de2)) {
+ repo_diff_r(depth + 1, path,
+ repo_dir_from_dirent(de1),
+ repo_dir_from_dirent(de2));
+ } else {
+ if (repo_dirent_is_dir(de1) != repo_dirent_is_dir(de2)) {
+ fast_export_delete(depth + 1, path);
+ }
+ repo_git_add(depth + 1, path, de2);
+ }
+ }
+ de1++;
+ de2++;
+ } else {
+ path[depth] = de2->name_offset;
+ repo_git_add(depth + 1, path, de2++);
+ }
+ }
+ while (de1 < max_de1) {
+ path[depth] = (de1++)->name_offset;
+ fast_export_delete(depth + 1, path);
+ }
+ while (de2 < max_de2) {
+ path[depth] = de2->name_offset;
+ repo_git_add(depth + 1, path, de2++);
+ }
+}
+
+static uint32_t path_stack[1000];
+void repo_diff(uint32_t r1, uint32_t r2)
+{
+ repo_diff_r(0,
+ path_stack,
+ repo_commit_root_dir(commit_pointer(r1)),
+ repo_commit_root_dir(commit_pointer(r2)));
+}
+
+void repo_commit(uint32_t revision, char *author, char *log, char *uuid,
+ char *url, time_t timestamp)
+{
+ if (revision == 0) {
+ active_commit = commit_alloc(1);
+ commit_pointer(active_commit)->root_dir_offset =
+ dir_with_dirents_alloc(0);
+ } else {
+ fast_export_commit(revision, author, log, uuid, url, timestamp);
+ }
+ num_dirs_saved = dir_pool.size;
+ num_dirents_saved = dirent_pool.size;
+ active_commit = commit_alloc(1);
+ commit_pointer(active_commit)->root_dir_offset =
+ commit_pointer(active_commit - 1)->root_dir_offset;
+}
+
+void repo_reset(void)
+{
+ pool_reset();
+ commit_reset();
+ dir_reset();
+ dirent_reset();
+}
diff --git a/vcs-svn/repo_tree.h b/vcs-svn/repo_tree.h
new file mode 100644
index 0000000..2d645dc
--- /dev/null
+++ b/vcs-svn/repo_tree.h
@@ -0,0 +1,31 @@
+#ifndef REPO_TREE_H_
+#define REPO_TREE_H_
+
+#include <stdint.h>
+#include <time.h>
+
+#define REPO_MODE_DIR 0040000
+#define REPO_MODE_BLB 0100644
+#define REPO_MODE_EXE 0100755
+#define REPO_MODE_LNK 0120000
+
+#define REPO_MAX_PATH_LEN 4096
+
+uint32_t repo_copy(uint32_t revision, char *src, char *dst);
+
+void repo_add(char *path, uint32_t mode, uint32_t blob_mark);
+
+uint32_t repo_replace(char *path, uint32_t blob_mark);
+
+void repo_modify(char *path, uint32_t mode, uint32_t blob_mark);
+
+void repo_delete(char *path);
+
+void repo_commit(uint32_t revision, char *author, char *log, char *uuid,
+ char *url, time_t timestamp);
+
+void repo_diff(uint32_t r1, uint32_t r2);
+
+void repo_reset(void);
+
+#endif
--
1.7.1
--
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