Add support for snapshots

Make a link from the commit viewer to a snapshot of the corresponding tree.

Currently only zip-format is supported.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

8 files changed, 153 insertions, 8 deletions

diff --git a/Makefile b/Makefile
index d826f97..b1c3a4e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,41 +1,42 @@
 CGIT_VERSION = 0.2
 
 prefix = /var/www/htdocs/cgit
 gitsrc = ../git
 
 CACHE_ROOT = /var/cache/cgit
 EXTLIBS = $(gitsrc)/libgit.a $(gitsrc)/xdiff/lib.a -lz -lcrypto
 OBJECTS = shared.o cache.o parsing.o html.o ui-shared.o ui-repolist.o \
-        ui-summary.o ui-log.o ui-view.c ui-tree.c ui-commit.c ui-diff.o
+        ui-summary.o ui-log.o ui-view.c ui-tree.c ui-commit.c ui-diff.o \
+        ui-snapshot.o
 
 CFLAGS += -Wall
 
 ifdef DEBUG
         CFLAGS += -g
 endif
 
 all: cgit
 
 install: all clean-cache
         mkdir -p $(prefix)
         install cgit $(prefix)/cgit.cgi
         install cgit.css $(prefix)/cgit.css
 
 cgit: cgit.c cgit.h git.h $(OBJECTS) $(gitsrc)/libgit.a
         $(CC) $(CFLAGS) -DCGIT_VERSION='"$(CGIT_VERSION)"' cgit.c -o cgit \
                 $(OBJECTS) $(EXTLIBS)
 
 $(OBJECTS): cgit.h git.h
 
 ui-diff.o: xdiff.h
 
 $(gitsrc)/libgit.a:
         $(MAKE) -C $(gitsrc)
 
 
 .PHONY: clean
 clean:
         rm -f cgit *.o
 
 clean-cache:
         rm -rf $(CACHE_ROOT)/*
diff --git a/cgit.c b/cgit.c
index 0fa203c..2795ecc 100644
--- a/cgit.c
+++ b/cgit.c
@@ -1,219 +1,244 @@
 /* cgit.c: cgi for the git scm
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 const char cgit_version[] = CGIT_VERSION;
 
 
 static struct repoinfo *cgit_get_repoinfo(char *url)
 {
         int i;
         struct repoinfo *repo;
         
         for (i=0; i<cgit_repolist.count; i++) {
                 repo = &cgit_repolist.repos[i];
                 if (!strcmp(repo->url, url))
                         return repo;
         }
         return NULL;
 }
 
 
 static int cgit_prepare_cache(struct cacheitem *item)
 {
         if (!cgit_query_repo) {
                 item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
                 item->ttl = cgit_cache_root_ttl;
                 return 1;
         }
         cgit_repo = cgit_get_repoinfo(cgit_query_repo);
         if (!cgit_repo) {
                 char *title = fmt("%s - %s", cgit_root_title, "Bad request");
                 cgit_print_docstart(title, item);
                 cgit_print_pageheader(title, 0);
                 cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
                 cgit_print_docend();
                 return 0;
         }
 
         if (!cgit_query_page) {
                 item->name = xstrdup(fmt("%s/%s/index.html", cgit_cache_root, 
                            cgit_repo->url));
                 item->ttl = cgit_cache_repo_ttl;
         } else {
                 item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root, 
                            cgit_repo->url, cgit_query_page, 
                            cache_safe_filename(cgit_querystring)));
                 if (cgit_query_has_symref)
                         item->ttl = cgit_cache_dynamic_ttl;
                 else if (cgit_query_has_sha1)
                         item->ttl = cgit_cache_static_ttl;
                 else
                         item->ttl = cgit_cache_repo_ttl;
         }
         return 1;
 }
 
 static void cgit_print_repo_page(struct cacheitem *item)
 {
         char *title;
         int show_search;
 
         if (chdir(cgit_repo->path)) {
                 title = fmt("%s - %s", cgit_root_title, "Bad request");
                 cgit_print_docstart(title, item);
                 cgit_print_pageheader(title, 0);
                 cgit_print_error(fmt("Unable to scan repository: %s",
                                      strerror(errno)));
                 cgit_print_docend();
                 return;
         }
 
         title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
         show_search = 0;
         setenv("GIT_DIR", cgit_repo->path, 1);
+
+        if (cgit_query_page && !strcmp(cgit_query_page, "snapshot")) {
+                cgit_print_snapshot(item, cgit_query_sha1, "zip", 
+                                    cgit_repo->url, cgit_query_name);
+                return;
+        }
+
         if (cgit_query_page && !strcmp(cgit_query_page, "log"))
                 show_search = 1;
         cgit_print_docstart(title, item);
         cgit_print_pageheader(title, show_search);
         if (!cgit_query_page) {
                 cgit_print_summary();
         } else if (!strcmp(cgit_query_page, "log")) {
-                cgit_print_log(cgit_query_head, cgit_query_ofs, 100, cgit_query_search);
+                cgit_print_log(cgit_query_head, cgit_query_ofs, 100, 
+                               cgit_query_search);
         } else if (!strcmp(cgit_query_page, "tree")) {
                 cgit_print_tree(cgit_query_sha1, cgit_query_path);
         } else if (!strcmp(cgit_query_page, "commit")) {
                 cgit_print_commit(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "view")) {
                 cgit_print_view(cgit_query_sha1);
         } else if (!strcmp(cgit_query_page, "diff")) {
                 cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
+        } else {
+                cgit_print_error("Invalid request");
         }
         cgit_print_docend();
 }
 
-static void cgit_fill_cache(struct cacheitem *item)
+static void cgit_fill_cache(struct cacheitem *item, int use_cache)
 {
         static char buf[PATH_MAX];
+        int stdout2;
 
         getcwd(buf, sizeof(buf));
-        htmlfd = item->fd;
         item->st.st_mtime = time(NULL);
+
+        if (use_cache) {
+                stdout2 = chk_positive(dup(STDOUT_FILENO), 
+                                       "Preserving STDOUT");
+                chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
+                chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
+        }
+
         if (cgit_query_repo)
                 cgit_print_repo_page(item);
         else
                 cgit_print_repolist(item);
+
+        if (use_cache) {
+                chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
+                chk_positive(dup2(stdout2, STDOUT_FILENO), 
+                             "Restoring original STDOUT");
+                chk_zero(close(stdout2), "Closing temporary STDOUT");
+        }
+
         chdir(buf);
 }
 
 static void cgit_check_cache(struct cacheitem *item)
 {
         int i = 0;
 
  top:
         if (++i > cgit_max_lock_attempts) {
                 die("cgit_refresh_cache: unable to lock %s: %s",
                     item->name, strerror(errno));
         }
         if (!cache_exist(item)) {
                 if (!cache_lock(item)) {
                         sleep(1);
                         goto top;
                 }
                 if (!cache_exist(item)) {
-                        cgit_fill_cache(item);
+                        cgit_fill_cache(item, 1);
                         cache_unlock(item);
                 } else {
                         cache_cancel_lock(item);
                 }
         } else if (cache_expired(item) && cache_lock(item)) {
                 if (cache_expired(item)) {
-                        cgit_fill_cache(item);
+                        cgit_fill_cache(item, 1);
                         cache_unlock(item);
                 } else {
                         cache_cancel_lock(item);
                 }
         }
 }
 
 static void cgit_print_cache(struct cacheitem *item)
 {
         static char buf[4096];
         ssize_t i;
 
         int fd = open(item->name, O_RDONLY);
         if (fd<0)
                 die("Unable to open cached file %s", item->name);
 
         while((i=read(fd, buf, sizeof(buf))) > 0)
                 write(STDOUT_FILENO, buf, i);
 
         close(fd);
 }
 
 static void cgit_parse_args(int argc, const char **argv)
 {
         int i;
 
         for (i = 1; i < argc; i++) {
                 if (!strncmp(argv[i], "--cache=", 8)) {
                         cgit_cache_root = xstrdup(argv[i]+8);
                 }
                 if (!strcmp(argv[i], "--nocache")) {
                         cgit_nocache = 1;
                 }
                 if (!strncmp(argv[i], "--query=", 8)) {
                         cgit_querystring = xstrdup(argv[i]+8);
                 }
                 if (!strncmp(argv[i], "--repo=", 7)) {
                         cgit_query_repo = xstrdup(argv[i]+7);
                 }
                 if (!strncmp(argv[i], "--page=", 7)) {
                         cgit_query_page = xstrdup(argv[i]+7);
                 }
                 if (!strncmp(argv[i], "--head=", 7)) {
                         cgit_query_head = xstrdup(argv[i]+7);
                         cgit_query_has_symref = 1;
                 }
                 if (!strncmp(argv[i], "--sha1=", 7)) {
                         cgit_query_sha1 = xstrdup(argv[i]+7);
                         cgit_query_has_sha1 = 1;
                 }
                 if (!strncmp(argv[i], "--ofs=", 6)) {
                         cgit_query_ofs = atoi(argv[i]+6);
                 }
         }
 }
 
 int main(int argc, const char **argv)
 {
         struct cacheitem item;
 
         htmlfd = STDOUT_FILENO;
         item.st.st_mtime = time(NULL);
         cgit_repolist.length = 0;
         cgit_repolist.count = 0;
         cgit_repolist.repos = NULL;
 
         cgit_read_config("/etc/cgitrc", cgit_global_config_cb);
         if (getenv("QUERY_STRING"))
                 cgit_querystring = xstrdup(getenv("QUERY_STRING"));
         cgit_parse_args(argc, argv);
         cgit_parse_query(cgit_querystring, cgit_querystring_cb);
         if (!cgit_prepare_cache(&item))
                 return 0;
         if (cgit_nocache) {
-                item.fd = STDOUT_FILENO;
-                cgit_fill_cache(&item);
+                cgit_fill_cache(&item, 0);
         } else {
                 cgit_check_cache(&item);
                 cgit_print_cache(&item);
         }
         return 0;
 }
diff --git a/cgit.h b/cgit.h
index 2a3cd5a..03c2fdb 100644
--- a/cgit.h
+++ b/cgit.h
@@ -1,142 +1,152 @@
 #ifndef CGIT_H
 #define CGIT_H
 
 #include "git.h"
 #include <openssl/sha.h>
 #include <ctype.h>
 #include <sched.h>
 
 typedef void (*configfn)(const char *name, const char *value);
 
 struct cacheitem {
         char *name;
         struct stat st;
         int ttl;
         int fd;
 };
 
 struct repoinfo {
         char *url;
         char *name;
         char *path;
         char *desc;
         char *owner;
 };
 
 struct repolist {
         int length;
         int count;
         struct repoinfo *repos;
 };
 
 struct commitinfo {
         struct commit *commit;
         char *author;
         char *author_email;
         unsigned long author_date;
         char *committer;
         char *committer_email;
         unsigned long committer_date;
         char *subject;
         char *msg;
 };
 
 struct taginfo {
         char *tagger;
         char *tagger_email;
         int tagger_date;
         char *msg;
 };
 
 extern const char cgit_version[];
 
 extern struct repolist cgit_repolist;
 extern struct repoinfo *cgit_repo;
 
 extern char *cgit_root_title;
 extern char *cgit_css;
 extern char *cgit_logo;
 extern char *cgit_logo_link;
 extern char *cgit_virtual_root;
 extern char *cgit_cache_root;
 
 extern int cgit_nocache;
 extern int cgit_max_lock_attempts;
 extern int cgit_cache_root_ttl;
 extern int cgit_cache_repo_ttl;
 extern int cgit_cache_dynamic_ttl;
 extern int cgit_cache_static_ttl;
 extern int cgit_cache_max_create_time;
 
 extern int cgit_max_msg_len;
 
 extern char *cgit_repo_name;
 extern char *cgit_repo_desc;
 extern char *cgit_repo_owner;
 
 extern int cgit_query_has_symref;
 extern int cgit_query_has_sha1;
 
 extern char *cgit_querystring;
 extern char *cgit_query_repo;
 extern char *cgit_query_page;
 extern char *cgit_query_search;
 extern char *cgit_query_head;
 extern char *cgit_query_sha1;
 extern char *cgit_query_sha2;
 extern char *cgit_query_path;
+extern char *cgit_query_name;
 extern int   cgit_query_ofs;
 
 extern int htmlfd;
 
 extern void cgit_global_config_cb(const char *name, const char *value);
 extern void cgit_repo_config_cb(const char *name, const char *value);
 extern void cgit_querystring_cb(const char *name, const char *value);
 
+extern int chk_zero(int result, char *msg);
+extern int chk_positive(int result, char *msg);
+
 extern int hextoint(char c);
 
 extern void *cgit_free_commitinfo(struct commitinfo *info);
 
 extern char *fmt(const char *format,...);
 
 extern void html(const char *txt);
 extern void htmlf(const char *format,...);
 extern void html_txt(char *txt);
 extern void html_ntxt(int len, char *txt);
 extern void html_attr(char *txt);
 extern void html_hidden(char *name, char *value);
 extern void html_link_open(char *url, char *title, char *class);
 extern void html_link_close(void);
 extern void html_filemode(unsigned short mode);
 
 extern int cgit_read_config(const char *filename, configfn fn);
 extern int cgit_parse_query(char *txt, configfn fn);
 extern struct commitinfo *cgit_parse_commit(struct commit *commit);
 extern struct taginfo *cgit_parse_tag(struct tag *tag);
 
 extern char *cache_safe_filename(const char *unsafe);
 extern int cache_lock(struct cacheitem *item);
 extern int cache_unlock(struct cacheitem *item);
 extern int cache_cancel_lock(struct cacheitem *item);
 extern int cache_exist(struct cacheitem *item);
 extern int cache_expired(struct cacheitem *item);
 
 extern char *cgit_repourl(const char *reponame);
 extern char *cgit_pageurl(const char *reponame, const char *pagename, 
                           const char *query);
 
 extern void cgit_print_error(char *msg);
 extern void cgit_print_date(unsigned long secs);
 extern void cgit_print_docstart(char *title, struct cacheitem *item);
 extern void cgit_print_docend();
 extern void cgit_print_pageheader(char *title, int show_search);
+extern void cgit_print_snapshot_start(const char *mimetype, 
+                                      const char *filename, 
+                                      struct cacheitem *item);
 
 extern void cgit_print_repolist(struct cacheitem *item);
 extern void cgit_print_summary();
 extern void cgit_print_log(const char *tip, int ofs, int cnt, char *grep);
 extern void cgit_print_view(const char *hex);
 extern void cgit_print_tree(const char *hex, char *path);
 extern void cgit_print_commit(const char *hex);
 extern void cgit_print_diff(const char *old_hex, const char *new_hex);
+extern void cgit_print_snapshot(struct cacheitem *item, const char *hex, 
+                                const char *format, const char *prefix,
+                                const char *filename);
 
 #endif /* CGIT_H */
diff --git a/git.h b/git.h
index eca48d5..a1d1c4b 100644
--- a/git.h
+++ b/git.h
@@ -1,672 +1,699 @@
 #ifndef GIT_H
 #define GIT_H
 
 
 /*
  * from git:git-compat-util.h 
  */
 
 
 #ifndef FLEX_ARRAY
 #if defined(__GNUC__) && (__GNUC__ < 3)
 #define FLEX_ARRAY 0
 #else
 #define FLEX_ARRAY /* empty */
 #endif
 #endif
 
 
 #include <unistd.h>
 #include <stdio.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
 #include <sys/param.h>
 #include <netinet/in.h>
 #include <sys/types.h>
 #include <dirent.h>
 #include <time.h>
 #include <regex.h>
 
 /* On most systems <limits.h> would have given us this, but
  * not on some systems (e.g. GNU/Hurd).
  */
 #ifndef PATH_MAX
 #define PATH_MAX 4096
 #endif
 
 #ifdef __GNUC__
 #define NORETURN __attribute__((__noreturn__))
 #else
 #define NORETURN
 #ifndef __attribute__
 #define __attribute__(x)
 #endif
 #endif
 
 
 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
 
 
 static inline char* xstrdup(const char *str)
 {
         char *ret = strdup(str);
         if (!ret)
                 die("Out of memory, strdup failed");
         return ret;
 }
 
 static inline void *xmalloc(size_t size)
 {
         void *ret = malloc(size);
         if (!ret && !size)
                 ret = malloc(1);
         if (!ret)
                 die("Out of memory, malloc failed");
 #ifdef XMALLOC_POISON
         memset(ret, 0xA5, size);
 #endif
         return ret;
 }
 
 static inline void *xrealloc(void *ptr, size_t size)
 {
         void *ret = realloc(ptr, size);
         if (!ret && !size)
                 ret = realloc(ptr, 1);
         if (!ret)
                 die("Out of memory, realloc failed");
         return ret;
 }
 
 static inline void *xcalloc(size_t nmemb, size_t size)
 {
         void *ret = calloc(nmemb, size);
         if (!ret && (!nmemb || !size))
                 ret = calloc(1, 1);
         if (!ret)
                 die("Out of memory, calloc failed");
         return ret;
 }
 
 static inline ssize_t xread(int fd, void *buf, size_t len)
 {
         ssize_t nr;
         while (1) {
                 nr = read(fd, buf, len);
                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
                         continue;
                 return nr;
         }
 }
 
 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
 {
         ssize_t nr;
         while (1) {
                 nr = write(fd, buf, len);
                 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
                         continue;
                 return nr;
         }
 }
 
 
 
 
 /*
  * from git:cache.h
  */
 
 
 enum object_type {
         OBJ_NONE = 0,
         OBJ_COMMIT = 1,
         OBJ_TREE = 2,
         OBJ_BLOB = 3,
         OBJ_TAG = 4,
         /* 5 for future expansion */
         OBJ_OFS_DELTA = 6,
         OBJ_REF_DELTA = 7,
         OBJ_BAD,
 };
 
 
 /* Convert to/from hex/sha1 representation */
 #define MINIMUM_ABBREV 4
 #define DEFAULT_ABBREV 7
 
 extern const unsigned char null_sha1[20];
 
 extern int sha1_object_info(const unsigned char *, char *, unsigned long *);
 
 extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size);
 
 extern int get_sha1(const char *str, unsigned char *sha1);
 extern int get_sha1_hex(const char *hex, unsigned char *sha1);
         extern char *sha1_to_hex(const unsigned char *sha1);/* static buffer result! */
 
 static inline int is_null_sha1(const unsigned char *sha1)
 {
         return !memcmp(sha1, null_sha1, 20);
 }
 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 {
         return memcmp(sha1, sha2, 20);
 }
 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 {
         memcpy(sha_dst, sha_src, 20);
 }
 static inline void hashclr(unsigned char *hash)
 {
         memset(hash, 0, 20);
 }
 
 
 /*
  * from git:grep.h
  */
 
 enum grep_pat_token {
         GREP_PATTERN,
         GREP_PATTERN_HEAD,
         GREP_PATTERN_BODY,
         GREP_AND,
         GREP_OPEN_PAREN,
         GREP_CLOSE_PAREN,
         GREP_NOT,
         GREP_OR,
 };
 
 enum grep_context {
         GREP_CONTEXT_HEAD,
         GREP_CONTEXT_BODY,
 };
 
 struct grep_pat {
         struct grep_pat *next;
         const char *origin;
         int no;
         enum grep_pat_token token;
         const char *pattern;
         regex_t regexp;
 };
 
 enum grep_expr_node {
         GREP_NODE_ATOM,
         GREP_NODE_NOT,
         GREP_NODE_AND,
         GREP_NODE_OR,
 };
 
 struct grep_opt {
         struct grep_pat *pattern_list;
         struct grep_pat **pattern_tail;
         struct grep_expr *pattern_expression;
         int prefix_length;
         regex_t regexp;
         unsigned linenum:1;
         unsigned invert:1;
         unsigned status_only:1;
         unsigned name_only:1;
         unsigned unmatch_name_only:1;
         unsigned count:1;
         unsigned word_regexp:1;
         unsigned fixed:1;
         unsigned all_match:1;
 #define GREP_BINARY_DEFAULT     0
 #define GREP_BINARY_NOMATCH     1
 #define GREP_BINARY_TEXT        2
         unsigned binary:2;
         unsigned extended:1;
         unsigned relative:1;
         unsigned pathname:1;
         int regflags;
         unsigned pre_context;
         unsigned post_context;
 };
 
 
 extern void compile_grep_patterns(struct grep_opt *opt);
 extern void free_grep_patterns(struct grep_opt *opt);
 
 
 /*
  * from git:object.h 
  */
 
 extern const char *type_names[9];
 
 struct object_list {
         struct object *item;
         struct object_list *next;
 };
 
 struct object_refs {
         unsigned count;
         struct object *base;
         struct object *ref[FLEX_ARRAY]; /* more */
 };
 
 struct object_array {
         unsigned int nr;
         unsigned int alloc;
         struct object_array_entry {
                 struct object *item;
                 const char *name;
         } *objects;
 };
 
 #define TYPE_BITS   3
 #define FLAG_BITS  27
 
 /*
  * The object type is stored in 3 bits.
  */
 struct object {
         unsigned parsed : 1;
         unsigned used : 1;
         unsigned type : TYPE_BITS;
         unsigned flags : FLAG_BITS;
         unsigned char sha1[20];
 };
 
 
 /** Returns the object, having parsed it to find out what it is. **/
 struct object *parse_object(const unsigned char *sha1);
 
 
 /*
  * from git:tree.h
  */
 
 struct tree {
         struct object object;
         void *buffer;
         unsigned long size;
 };
 
 
 struct tree *lookup_tree(const unsigned char *sha1);
 int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size);
 int parse_tree(struct tree *tree);
 struct tree *parse_tree_indirect(const unsigned char *sha1);
 
 typedef int (*read_tree_fn_t)(const unsigned char *, const char *, int, const char *, unsigned int, int);
 
 extern int read_tree_recursive(struct tree *tree,
                                const char *base, int baselen,
                                int stage, const char **match,
                                read_tree_fn_t fn);
 
 extern int read_tree(struct tree *tree, int stage, const char **paths);
 
 
 /* from git:commit.h */
 
 struct commit_list {
         struct commit *item;
         struct commit_list *next;
 };
 
 struct commit {
         struct object object;
         void *util;
         unsigned long date;
         struct commit_list *parents;
         struct tree *tree;
         char *buffer;
 };
 
 
 struct commit *lookup_commit(const unsigned char *sha1);
 struct commit *lookup_commit_reference(const unsigned char *sha1);
 struct commit *lookup_commit_reference_gently(const unsigned char *sha1,
                                               int quiet);
 
 int parse_commit_buffer(struct commit *item, void *buffer, unsigned long size);
 int parse_commit(struct commit *item);
 
 struct commit_list * commit_list_insert(struct commit *item, struct commit_list **list_p);
 struct commit_list * insert_by_date(struct commit *item, struct commit_list **list);
 
 void free_commit_list(struct commit_list *list);
 
 void sort_by_date(struct commit_list **list);
 
 /* Commit formats */
 enum cmit_fmt {
         CMIT_FMT_RAW,
         CMIT_FMT_MEDIUM,
         CMIT_FMT_DEFAULT = CMIT_FMT_MEDIUM,
         CMIT_FMT_SHORT,
         CMIT_FMT_FULL,
         CMIT_FMT_FULLER,
         CMIT_FMT_ONELINE,
         CMIT_FMT_EMAIL,
 
         CMIT_FMT_UNSPECIFIED,
 };
 
 extern unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit *, unsigned long len, char *buf, unsigned long space, int abbrev, const char *subject, const char *after_subject, int relative_date);
 
 
 typedef void (*topo_sort_set_fn_t)(struct commit*, void *data);
 typedef void* (*topo_sort_get_fn_t)(struct commit*);
 
 
 
 /*
  * from git:tag.h
  */
 
 extern const char *tag_type;
 
 struct tag {
         struct object object;
         struct object *tagged;
         char *tag;
         char *signature; /* not actually implemented */
 };
 
 extern struct tag *lookup_tag(const unsigned char *sha1);
 extern int parse_tag_buffer(struct tag *item, void *data, unsigned long size);
 extern int parse_tag(struct tag *item);
 extern struct object *deref_tag(struct object *, const char *, int);
 
 
 /*
  * from git:diffcore.h
  */
 
 struct diff_filespec {
         unsigned char sha1[20];
         char *path;
         void *data;
         void *cnt_data;
         unsigned long size;
                 int xfrm_flags;          /* for use by the xfrm */
                 unsigned short mode; /* file mode */
         unsigned sha1_valid : 1; /* if true, use sha1 and trust mode;
                                   * if false, use the name and read from
                                   * the filesystem.
                                   */
 #define DIFF_FILE_VALID(spec) (((spec)->mode) != 0)
         unsigned should_free : 1; /* data should be free()'ed */
         unsigned should_munmap : 1; /* data should be munmap()'ed */
 };
 
 struct diff_filepair {
         struct diff_filespec *one;
         struct diff_filespec *two;
         unsigned short int score;
         char status; /* M C R N D U (see Documentation/diff-format.txt) */
         unsigned source_stays : 1; /* all of R/C are copies */
         unsigned broken_pair : 1;
         unsigned renamed_pair : 1;
 };
 
 #define DIFF_PAIR_UNMERGED(p) \
         (!DIFF_FILE_VALID((p)->one) && !DIFF_FILE_VALID((p)->two))
 
 #define DIFF_PAIR_RENAME(p) ((p)->renamed_pair)
 
 #define DIFF_PAIR_BROKEN(p) \
         ( (!DIFF_FILE_VALID((p)->one) != !DIFF_FILE_VALID((p)->two)) && \
           ((p)->broken_pair != 0) )
 
 #define DIFF_PAIR_TYPE_CHANGED(p) \
         ((S_IFMT & (p)->one->mode) != (S_IFMT & (p)->two->mode))
 
 #define DIFF_PAIR_MODE_CHANGED(p) ((p)->one->mode != (p)->two->mode)
 
 extern void diff_free_filepair(struct diff_filepair *);
 
 extern int diff_unmodified_pair(struct diff_filepair *);
 
 struct diff_queue_struct {
         struct diff_filepair **queue;
         int alloc;
         int nr;
 };
 
 
 /*
  *  from git:diff.h
  */
 
 
 struct rev_info;
 struct diff_options;
 struct diff_queue_struct;
 
 typedef void (*change_fn_t)(struct diff_options *options,
                  unsigned old_mode, unsigned new_mode,
                  const unsigned char *old_sha1,
                  const unsigned char *new_sha1,
                  const char *base, const char *path);
 
 typedef void (*add_remove_fn_t)(struct diff_options *options,
                     int addremove, unsigned mode,
                     const unsigned char *sha1,
                     const char *base, const char *path);
 
 typedef void (*diff_format_fn_t)(struct diff_queue_struct *q,
                 struct diff_options *options, void *data);
 
         #define DIFF_FORMAT_RAW         0x0001
         #define DIFF_FORMAT_DIFFSTAT0x0002
         #define DIFF_FORMAT_NUMSTAT0x0004
         #define DIFF_FORMAT_SUMMARY0x0008
         #define DIFF_FORMAT_PATCH0x0010
 
 /* These override all above */
         #define DIFF_FORMAT_NAME0x0100
         #define DIFF_FORMAT_NAME_STATUS0x0200
         #define DIFF_FORMAT_CHECKDIFF0x0400
 
 /* Same as output_format = 0 but we know that -s flag was given
  * and we should not give default value to output_format.
  */
         #define DIFF_FORMAT_NO_OUTPUT0x0800
 
         #define DIFF_FORMAT_CALLBACK0x1000
 
 struct diff_options {
         const char *filter;
         const char *orderfile;
         const char *pickaxe;
         const char *single_follow;
         unsigned recursive:1,
                  tree_in_recursive:1,
                  binary:1,
                  text:1,
                  full_index:1,
                  silent_on_remove:1,
                  find_copies_harder:1,
                  color_diff:1,
                  color_diff_words:1;
         int context;
         int break_opt;
         int detect_rename;
         int line_termination;
         int output_format;
         int pickaxe_opts;
         int rename_score;
         int reverse_diff;
         int rename_limit;
         int setup;
         int abbrev;
         const char *msg_sep;
         const char *stat_sep;
         long xdl_opts;
 
         int stat_width;
         int stat_name_width;
 
         int nr_paths;
         const char **paths;
         int *pathlens;
         change_fn_t change;
         add_remove_fn_t add_remove;
         diff_format_fn_t format_callback;
         void *format_callback_data;
 };
 
 enum color_diff {
         DIFF_RESET = 0,
         DIFF_PLAIN = 1,
         DIFF_METAINFO = 2,
         DIFF_FRAGINFO = 3,
         DIFF_FILE_OLD = 4,
         DIFF_FILE_NEW = 5,
         DIFF_COMMIT = 6,
         DIFF_WHITESPACE = 7,
 };
 
 
 extern int diff_tree_sha1(const unsigned char *old, const unsigned char *new,
                           const char *base, struct diff_options *opt);
 
 extern int diff_root_tree_sha1(const unsigned char *new, const char *base,
                                struct diff_options *opt);
 
 extern int git_diff_ui_config(const char *var, const char *value);
 extern void diff_setup(struct diff_options *);
 extern int diff_opt_parse(struct diff_options *, const char **, int);
 extern int diff_setup_done(struct diff_options *);
 
 
 extern void diffcore_std(struct diff_options *);
 extern void diff_flush(struct diff_options*);
 
 
 /* diff-raw status letters */
         #define DIFF_STATUS_ADDED       'A'
         #define DIFF_STATUS_COPIED      'C'
         #define DIFF_STATUS_DELETED     'D'
         #define DIFF_STATUS_MODIFIED    'M'
         #define DIFF_STATUS_RENAMED     'R'
         #define DIFF_STATUS_TYPE_CHANGED'T'
         #define DIFF_STATUS_UNKNOWN     'X'
         #define DIFF_STATUS_UNMERGED    'U'
 
 
 
 /*
  * from git:refs.g
  */
 
 typedef int each_ref_fn(const char *refname, const unsigned char *sha1, int flags, void *cb_data);
 extern int head_ref(each_ref_fn, void *);
 extern int for_each_ref(each_ref_fn, void *);
 extern int for_each_tag_ref(each_ref_fn, void *);
 extern int for_each_branch_ref(each_ref_fn, void *);
 extern int for_each_remote_ref(each_ref_fn, void *);
 
 
 
 /*
  * from git:revision.h
  */
 
 struct rev_info;
 struct log_info;
 
 typedef void (prune_fn_t)(struct rev_info *revs, struct commit *commit);
 
 struct rev_info {
         /* Starting list */
         struct commit_list *commits;
         struct object_array pending;
 
         /* Basic information */
         const char *prefix;
         void *prune_data;
         prune_fn_t *prune_fn;
 
         /* Traversal flags */
                 unsigned intdense:1,
                         no_merges:1,
                         no_walk:1,
                         remove_empty_trees:1,
                         simplify_history:1,
                         lifo:1,
                         topo_order:1,
                         tag_objects:1,
                         tree_objects:1,
                         blob_objects:1,
                         edge_hint:1,
                         limited:1,
                         unpacked:1, /* see also ignore_packed below */
                         boundary:1,
                         parents:1;
 
         /* Diff flags */
                 unsigned intdiff:1,
                         full_diff:1,
                         show_root_diff:1,
                         no_commit_id:1,
                         verbose_header:1,
                         ignore_merges:1,
                         combine_merges:1,
                         dense_combined_merges:1,
                         always_show_header:1;
 
         /* Format info */
                 unsigned intshown_one:1,
                         abbrev_commit:1,
                         relative_date:1;
 
         const char **ignore_packed; /* pretend objects in these are unpacked */
         int num_ignore_packed;
 
                 unsigned intabbrev;
                 enum cmit_fmtcommit_format;
         struct log_info *loginfo;
                 int     nr, total;
                 const char*mime_boundary;
                 const char*message_id;
                 const char*ref_message_id;
                 const char*add_signoff;
                 const char*extra_headers;
 
         /* Filter by commit log message */
                 struct grep_opt*grep_filter;
 
         /* special limits */
         int max_count;
         unsigned long max_age;
         unsigned long min_age;
 
         /* diff info for patches and for paths limiting */
         struct diff_options diffopt;
         struct diff_options pruning;
 
         topo_sort_set_fn_t topo_setter;
         topo_sort_get_fn_t topo_getter;
 };
 
 
 extern void init_revisions(struct rev_info *revs, const char *prefix);
 extern int setup_revisions(int argc, const char **argv, struct rev_info *revs, const char *def);
 extern int handle_revision_arg(const char *arg, struct rev_info *revs,int flags,int cant_be_filename);
 
 extern void prepare_revision_walk(struct rev_info *revs);
 extern struct commit *get_revision(struct rev_info *revs);
 
 
 
 /* from git:log-tree.h */
 
 int log_tree_commit(struct rev_info *, struct commit *);
 
 
 
+/* from git:archive.h */
+
+struct archiver_args {
+        const char *base;
+        struct tree *tree;
+        const unsigned char *commit_sha1;
+        time_t time;
+        const char **pathspec;
+        unsigned int verbose : 1;
+        void *extra;
+};
+
+typedef int (*write_archive_fn_t)(struct archiver_args *);
+
+typedef void *(*parse_extra_args_fn_t)(int argc, const char **argv);
+
+struct archiver {
+        const char *name;
+        struct archiver_args args;
+        write_archive_fn_t write_archive;
+        parse_extra_args_fn_t parse_extra;
+};
+
+extern int write_tar_archive(struct archiver_args *);
+extern int write_zip_archive(struct archiver_args *);
+extern void *parse_extra_zip_args(int argc, const char **argv);
+
 #endif /* GIT_H */
diff --git a/shared.c b/shared.c
index 6fd70a8..5757d0c 100644
--- a/shared.c
+++ b/shared.c
@@ -1,168 +1,185 @@
 /* shared.c: global vars + some callback functions
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 struct repolist cgit_repolist;
 struct repoinfo *cgit_repo;
 
 char *cgit_root_title   = "Git repository browser";
 char *cgit_css          = "/cgit.css";
 char *cgit_logo         = "/git-logo.png";
 char *cgit_logo_link    = "http://www.kernel.org/pub/software/scm/git/docs/";
 char *cgit_virtual_root = NULL;
 
 char *cgit_cache_root   = "/var/cache/cgit";
 
 int cgit_nocache               =  0;
 int cgit_max_lock_attempts     =  5;
 int cgit_cache_root_ttl        =  5;
 int cgit_cache_repo_ttl        =  5;
 int cgit_cache_dynamic_ttl     =  5;
 int cgit_cache_static_ttl      = -1;
 int cgit_cache_max_create_time =  5;
 
 int cgit_max_msg_len = 60;
 
 char *cgit_repo_name    = NULL;
 char *cgit_repo_desc    = NULL;
 char *cgit_repo_owner   = NULL;
 
 int cgit_query_has_symref = 0;
 int cgit_query_has_sha1   = 0;
 
 char *cgit_querystring  = NULL;
 char *cgit_query_repo   = NULL;
 char *cgit_query_page   = NULL;
 char *cgit_query_head   = NULL;
 char *cgit_query_search = NULL;
 char *cgit_query_sha1   = NULL;
 char *cgit_query_sha2   = NULL;
 char *cgit_query_path   = NULL;
+char *cgit_query_name   = NULL;
 int   cgit_query_ofs    = 0;
 
 int htmlfd = 0;
 
+int chk_zero(int result, char *msg)
+{
+        if (result != 0)
+                die("%s: %s", msg, strerror(errno));
+        return result;
+}
+
+int chk_positive(int result, char *msg)
+{
+        if (result <= 0)
+                die("%s: %s", msg, strerror(errno));
+        return result;
+}
+
 struct repoinfo *add_repo(const char *url)
 {
         struct repoinfo *ret;
 
         if (++cgit_repolist.count > cgit_repolist.length) {
                 if (cgit_repolist.length == 0)
                         cgit_repolist.length = 8;
                 else
                         cgit_repolist.length *= 2;
                 cgit_repolist.repos = xrealloc(cgit_repolist.repos, 
                                                cgit_repolist.length * 
                                                sizeof(struct repoinfo));
         }
 
         ret = &cgit_repolist.repos[cgit_repolist.count-1];
         ret->url = xstrdup(url);
         ret->name = ret->url;
         ret->path = NULL;
         ret->desc = NULL;
         ret->owner = NULL;
         return ret;
 }
 
 void cgit_global_config_cb(const char *name, const char *value)
 {
         if (!strcmp(name, "root-title"))
                 cgit_root_title = xstrdup(value);
         else if (!strcmp(name, "css"))
                 cgit_css = xstrdup(value);
         else if (!strcmp(name, "logo"))
                 cgit_logo = xstrdup(value);
         else if (!strcmp(name, "logo-link"))
                 cgit_logo_link = xstrdup(value);
         else if (!strcmp(name, "virtual-root"))
                 cgit_virtual_root = xstrdup(value);
         else if (!strcmp(name, "nocache"))
                 cgit_nocache = atoi(value);
         else if (!strcmp(name, "cache-root"))
                 cgit_cache_root = xstrdup(value);
         else if (!strcmp(name, "cache-root-ttl"))
                 cgit_cache_root_ttl = atoi(value);
         else if (!strcmp(name, "cache-repo-ttl"))
                 cgit_cache_repo_ttl = atoi(value);
         else if (!strcmp(name, "cache-static-ttl"))
                 cgit_cache_static_ttl = atoi(value);
         else if (!strcmp(name, "cache-dynamic-ttl"))
                 cgit_cache_dynamic_ttl = atoi(value);
         else if (!strcmp(name, "max-message-length"))
                 cgit_max_msg_len = atoi(value);
         else if (!strcmp(name, "repo.url"))
                 cgit_repo = add_repo(value);
         else if (!strcmp(name, "repo.name"))
                 cgit_repo->name = xstrdup(value);
         else if (cgit_repo && !strcmp(name, "repo.path"))
                 cgit_repo->path = xstrdup(value);
         else if (cgit_repo && !strcmp(name, "repo.desc"))
                 cgit_repo->desc = xstrdup(value);
         else if (cgit_repo && !strcmp(name, "repo.owner"))
                 cgit_repo->owner = xstrdup(value);
 }
 
 void cgit_repo_config_cb(const char *name, const char *value)
 {
         if (!strcmp(name, "name"))
                 cgit_repo_name = xstrdup(value);
         else if (!strcmp(name, "desc"))
                 cgit_repo_desc = xstrdup(value);
         else if (!strcmp(name, "owner"))
                 cgit_repo_owner = xstrdup(value);
 }
 
 void cgit_querystring_cb(const char *name, const char *value)
 {
         if (!strcmp(name,"r")) {
                 cgit_query_repo = xstrdup(value);
         } else if (!strcmp(name, "p")) {
                 cgit_query_page = xstrdup(value);
         } else if (!strcmp(name, "q")) {
                 cgit_query_search = xstrdup(value);
         } else if (!strcmp(name, "h")) {
                 cgit_query_head = xstrdup(value);
                 cgit_query_has_symref = 1;
         } else if (!strcmp(name, "id")) {
                 cgit_query_sha1 = xstrdup(value);
                 cgit_query_has_sha1 = 1;
         } else if (!strcmp(name, "id2")) {
                 cgit_query_sha2 = xstrdup(value);
                 cgit_query_has_sha1 = 1;
         } else if (!strcmp(name, "ofs")) {
                 cgit_query_ofs = atoi(value);
         } else if (!strcmp(name, "path")) {
                 cgit_query_path = xstrdup(value);
+        } else if (!strcmp(name, "name")) {
+                cgit_query_name = xstrdup(value);
         }
 }
 
 void *cgit_free_commitinfo(struct commitinfo *info)
 {
         free(info->author);
         free(info->author_email);
         free(info->committer);
         free(info->committer_email);
         free(info->subject);
         free(info);
         return NULL;
 }
 
 int hextoint(char c)
 {
         if (c >= 'a' && c <= 'f')
                 return 10 + c - 'a';
         else if (c >= 'A' && c <= 'F')
                 return 10 + c - 'A';
         else if (c >= '0' && c <= '9')
                 return c - '0';
         else
                 return -1;
 }
 
diff --git a/ui-commit.c b/ui-commit.c
index 73fa104..de3f2cf 100644
--- a/ui-commit.c
+++ b/ui-commit.c
@@ -1,185 +1,192 @@
 /* ui-commit.c: generate commit view
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 int files = 0;
 
 void print_filepair(struct diff_filepair *pair)
 {
         char *query;
         char *class;
         
         switch (pair->status) {
         case DIFF_STATUS_ADDED:
                 class = "add";
                 break;
         case DIFF_STATUS_COPIED:
                 class = "cpy";
                 break;
         case DIFF_STATUS_DELETED:
                 class = "del";
                 break;
         case DIFF_STATUS_MODIFIED:
                 class = "upd";
                 break;
         case DIFF_STATUS_RENAMED:
                 class = "mov";
                 break;
         case DIFF_STATUS_TYPE_CHANGED:
                 class = "typ";
                 break;
         case DIFF_STATUS_UNKNOWN:
                 class = "unk";
                 break;
         case DIFF_STATUS_UNMERGED:
                 class = "stg";
                 break;
         default:
                 die("bug: unhandled diff status %c", pair->status);
         }
 
         html("<tr>");
         htmlf("<td class='mode'>");
         if (is_null_sha1(pair->two->sha1)) {
                 html_filemode(pair->one->mode);
         } else {
                 html_filemode(pair->two->mode);
         }
 
         if (pair->one->mode != pair->two->mode && 
             !is_null_sha1(pair->one->sha1) && 
             !is_null_sha1(pair->two->sha1)) {
                 html("<span class='modechange'>[");
                 html_filemode(pair->one->mode);
                 html("]</span>");
         }
         htmlf("</td><td class='%s'>", class);
         query = fmt("id=%s&id2=%s", sha1_to_hex(pair->one->sha1), 
                             sha1_to_hex(pair->two->sha1));
         html_link_open(cgit_pageurl(cgit_query_repo, "diff", query), 
                        NULL, NULL);
         if (pair->status == DIFF_STATUS_COPIED || 
             pair->status == DIFF_STATUS_RENAMED) {
                 html_txt(pair->two->path);
                 htmlf("</a> (%s from ", pair->status == DIFF_STATUS_COPIED ? 
                       "copied" : "renamed");
                         query = fmt("id=%s", sha1_to_hex(pair->one->sha1));
                 html_link_open(cgit_pageurl(cgit_query_repo, "view", query), 
                                NULL, NULL);
                 html_txt(pair->one->path);
                 html("</a>)");
         } else {
                 html_txt(pair->two->path);
                 html("</a>");
         }
         html("<td>");
 
         //TODO: diffstat graph
         
         html("</td></tr>\n");
                 files++;
 }
 
 void diff_format_cb(struct diff_queue_struct *q,
                     struct diff_options *options, void *data)
 {
         int i;
 
         for (i = 0; i < q->nr; i++) {
                 if (q->queue[i]->status == 'U')
                         continue;
                 print_filepair(q->queue[i]);
         }
 }
 
 void cgit_diffstat(struct commit *commit)
 {
         struct diff_options opt;
         int ret;
 
         diff_setup(&opt);
         opt.output_format = DIFF_FORMAT_CALLBACK;
         opt.detect_rename = 1;
         opt.recursive = 1;
         opt.format_callback = diff_format_cb;
         diff_setup_done(&opt);
         
         if (commit->parents)
                 ret = diff_tree_sha1(commit->parents->item->object.sha1,
                                      commit->object.sha1,
                                      "", &opt);
         else
                 ret = diff_root_tree_sha1(commit->object.sha1, "", &opt);
 
         diffcore_std(&opt);
         diff_flush(&opt);
 }
 
 void cgit_print_commit(const char *hex)
 {
         struct commit *commit;
         struct commitinfo *info;
         struct commit_list *p;
         unsigned char sha1[20];
         char *query;
+        char *filename;
 
         if (get_sha1(hex, sha1)) {
                 cgit_print_error(fmt("Bad object id: %s", hex));
                 return;
         }
         commit = lookup_commit_reference(sha1);
         if (!commit) {
                 cgit_print_error(fmt("Bad commit reference: %s", hex));
                 return;
         }
         info = cgit_parse_commit(commit);
 
         html("<table class='commit-info'>\n");
         html("<tr><th>author</th><td>");
         html_txt(info->author);
         html(" ");
         html_txt(info->author_email);
         html("</td><td class='right'>");
         cgit_print_date(info->author_date);
         html("</td></tr>\n");
         html("<tr><th>committer</th><td>");
         html_txt(info->committer);
         html(" ");
         html_txt(info->committer_email);
         html("</td><td class='right'>");
         cgit_print_date(info->committer_date);
         html("</td></tr>\n");
         html("<tr><th>tree</th><td colspan='2' class='sha1'><a href='");
         query = fmt("id=%s", sha1_to_hex(commit->tree->object.sha1));
         html_attr(cgit_pageurl(cgit_query_repo, "tree", query));
         htmlf("'>%s</a></td></tr>\n", sha1_to_hex(commit->tree->object.sha1));
               for (p = commit->parents; p ; p = p->next) {
                 html("<tr><th>parent</th>"
                      "<td colspan='2' class='sha1'>"
                      "<a href='");
                 query = fmt("id=%s", sha1_to_hex(p->item->object.sha1));
                 html_attr(cgit_pageurl(cgit_query_repo, "commit", query));
                 htmlf("'>%s</a></td></tr>\n", 
                       sha1_to_hex(p->item->object.sha1));
         }
+        htmlf("<tr><th>download</th><td colspan='2' class='sha1'><a href='");
+        filename = fmt("%s-%s.zip", cgit_query_repo, hex);
+        html_attr(cgit_pageurl(cgit_query_repo, "snapshot", 
+                               fmt("id=%s&name=%s", hex, filename)));
+        htmlf("'>%s</a></td></tr>", filename);
+        
         html("</table>\n");
         html("<div class='commit-subject'>");
         html_txt(info->subject);
         html("</div>");
         html("<div class='commit-msg'>");
         html_txt(info->msg);
         html("</div>");
         html("<table class='diffstat'>");
         html("<tr><th colspan='3'>Affected files</tr>\n");
         cgit_diffstat(commit);
         htmlf("<tr><td colspan='3' class='summary'>"
               "%d file%s changed</td></tr>\n", files, files > 1 ? "s" : "");
         html("</table>");
         cgit_free_commitinfo(info);
 }
diff --git a/ui-shared.c b/ui-shared.c
index 3322561..172499c 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -1,146 +1,157 @@
 /* ui-shared.c: common web output functions
  *
  * Copyright (C) 2006 Lars Hjemli
  *
  * Licensed under GNU General Public License v2
  *   (see COPYING for full license text)
  */
 
 #include "cgit.h"
 
 const char cgit_doctype[] =
 "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
 "  \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n";
 
 static char *http_date(time_t t)
 {
         static char day[][4] = 
                 {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
         static char month[][4] = 
                 {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
                  "Jul", "Aug", "Sep", "Oct", "Now", "Dec"};
         struct tm *tm = gmtime(&t);
         return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
                    tm->tm_mday, month[tm->tm_mon], 1900+tm->tm_year,
                    tm->tm_hour, tm->tm_min, tm->tm_sec);
 }
 
 static long ttl_seconds(long ttl)
 {
         if (ttl<0)
                 return 60 * 60 * 24 * 365;
         else
                 return ttl * 60;
 }
 
 void cgit_print_error(char *msg)
 {
         html("<div class='error'>");
         html_txt(msg);
         html("</div>\n");
 }
 
 char *cgit_repourl(const char *reponame)
 {
         if (cgit_virtual_root) {
                 return fmt("%s/%s/", cgit_virtual_root, reponame);
         } else {
                 return fmt("?r=%s", reponame);
         }
 }
 
 char *cgit_pageurl(const char *reponame, const char *pagename, 
                    const char *query)
 {
         if (cgit_virtual_root) {
                 return fmt("%s/%s/%s/?%s", cgit_virtual_root, reponame, 
                            pagename, query);
         } else {
                 return fmt("?r=%s&p=%s&%s", reponame, pagename, query);
         }
 }
 
 char *cgit_currurl()
 {
         if (!cgit_virtual_root)
                 return "./cgit.cgi";
         else if (cgit_query_page)
                 return fmt("%s/%s/%s/", cgit_virtual_root, cgit_query_repo, cgit_query_page);
         else if (cgit_query_repo)
                 return fmt("%s/%s/", cgit_virtual_root, cgit_query_repo);
         else
                 return fmt("%s/", cgit_virtual_root);
 }
 
 
 void cgit_print_date(unsigned long secs)
 {
         char buf[32];
         struct tm *time;
 
         time = gmtime(&secs);
         strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", time);
         html_txt(buf);
         
 }
 
 void cgit_print_docstart(char *title, struct cacheitem *item)
 {
         html("Content-Type: text/html; charset=utf-8\n");
         htmlf("Last-Modified: %s\n", http_date(item->st.st_mtime));
         htmlf("Expires: %s\n", http_date(item->st.st_mtime +
                                          ttl_seconds(item->ttl)));
         html("\n");
         html(cgit_doctype);
         html("<html>\n");
         html("<head>\n");
         html("<title>");
         html_txt(title);
         html("</title>\n");
         htmlf("<meta name='generator' content='cgit v%s'/>\n", cgit_version);
         html("<link rel='stylesheet' type='text/css' href='");
         html_attr(cgit_css);
         html("'/>\n");
         html("</head>\n");
         html("<body>\n");
 }
 
 void cgit_print_docend()
 {
         html("</td></tr></table>");
         html("</body>\n</html>\n");
 }
 
 void cgit_print_pageheader(char *title, int show_search)
 {
         html("<table id='layout'><tr><td id='header'>");
         htmlf("<a href='%s'>", cgit_logo_link);
         htmlf("<img id='logo' src='%s'/>\n", cgit_logo);
         htmlf("</a>");
         if (show_search) {
                 html("<form method='get' href='");
                 html_attr(cgit_currurl());
                 html("'>");
                 if (!cgit_virtual_root) {
                         if (cgit_query_repo)
                                 html_hidden("r", cgit_query_repo);
                         if (cgit_query_page)
                                 html_hidden("p", cgit_query_page);
                 }
                 if (cgit_query_head)
                         html_hidden("h", cgit_query_head);
                 if (cgit_query_sha1)
                         html_hidden("id", cgit_query_sha1);
                 if (cgit_query_sha2)
                         html_hidden("id2", cgit_query_sha2);
                 html("<input type='text' name='q' value='");
                 html_attr(cgit_query_search);
                 html("'/></form>");
         }
         if (cgit_query_repo)
                 htmlf("<a href='%s'>", cgit_repourl(cgit_query_repo));
         html_txt(title);
         if (cgit_query_repo)
                 html("</a>");
         html("</td></tr><tr><td id='content'>");
 }
+
+void cgit_print_snapshot_start(const char *mimetype, const char *filename, 
+                               struct cacheitem *item)
+{
+        htmlf("Content-Type: %s\n", mimetype);
+        htmlf("Content-Disposition: inline; filename=\"%s\"\n", filename);
+        htmlf("Last-Modified: %s\n", http_date(item->st.st_mtime));
+        htmlf("Expires: %s\n", http_date(item->st.st_mtime +
+                                         ttl_seconds(item->ttl)));
+        html("\n");
+}
diff --git a/ui-snapshot.c b/ui-snapshot.c
new file mode 100644
index 0000000..2257d6b
--- a/dev/null
+++ b/ui-snapshot.c
@@ -0,0 +1,47 @@
+/* ui-snapshot.c: generate snapshot of a commit
+ *
+ * Copyright (C) 2006 Lars Hjemli
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+
+static void cgit_print_zip(struct cacheitem *item, const char *hex, 
+                           const char *prefix, const char *filename)
+{
+        struct archiver_args args;
+        struct commit *commit;
+        unsigned char sha1[20];
+
+        if (get_sha1(hex, sha1)) {
+                cgit_print_error(fmt("Bad object id: %s", hex));
+                return;
+        }
+        commit = lookup_commit_reference(sha1);
+
+        if (!commit) {
+                cgit_print_error(fmt("Not a commit reference: %s", hex));
+                return;
+        }
+
+        memset(&args, 0, sizeof(args));
+        args.base = fmt("%s/", prefix);
+        args.tree = commit->tree;
+        
+        cgit_print_snapshot_start("application/x-zip", filename, item);
+        write_zip_archive(&args);
+}
+
+
+void cgit_print_snapshot(struct cacheitem *item, const char *hex, 
+                         const char *format, const char *prefix,
+                         const char *filename)
+{
+        if (!strcmp(format, "zip"))
+                cgit_print_zip(item, hex, prefix, filename);
+        else
+                cgit_print_error(fmt("Unsupported snapshot format: %s", 
+                                     format));
+}