ui-snapshot.c

   1 /* ui-snapshot.c: generate snapshot of a commit
   2  *
   3  * Copyright (C) 2006 Lars Hjemli
   4  *
   5  * Licensed under GNU General Public License v2
   6  *   (see COPYING for full license text)
   7  */
   8
   9 #include "cgit.h"
  10
  11 static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
  12 {
  13         int rw[2];
  14         pid_t gzpid;
  15         int stdout2;
  16         int status;
  17         int rv;
  18
  19         stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
  20         chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
  21         gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
  22         if(gzpid==0) {
  23                 /* child */
  24                 chk_zero(close(rw[1]), "Closing write end of pipe in child");
  25                 chk_zero(close(STDIN_FILENO), "Closing STDIN");
  26                 chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
  27                 execlp(filter,filter,NULL);
  28                 _exit(-1);
  29         }
  30         /* parent */
  31         chk_zero(close(rw[0]), "Closing read end of pipe");
  32         chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
  33
  34         rv = write_tar_archive(args);
  35
  36         chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
  37         chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
  38         chk_zero(close(stdout2), "Closing uncompressed STDOUT");
  39         chk_zero(close(rw[1]), "Closing write end of pipe in parent");
  40         chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
  41         if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
  42                 cgit_print_error("Failed to compress archive");
  43
  44         return rv;
  45 }
  46
  47 static int write_tar_gzip_archive(struct archiver_args *args)
  48 {
  49         return write_compressed_tar_archive(args,"gzip");
  50 }
  51 static int write_tar_bzip2_archive(struct archiver_args *args)
  52 {
  53         return write_compressed_tar_archive(args,"bzip2");
  54 }
  55
  56 static const struct snapshot_archive_t {
  57         const char *suffix;
  58         const char *mimetype;
  59         write_archive_fn_t write_func;
  60 }       snapshot_archives[] = {
  61         { ".zip", "application/x-zip", write_zip_archive },
  62         { ".tar.gz", "application/x-tar", write_tar_gzip_archive },
  63         { ".tar.bz2", "application/x-tar", write_tar_bzip2_archive },
  64         { ".tar", "application/x-tar", write_tar_archive }
  65 };
  66
  67 void cgit_print_snapshot(struct cacheitem *item, const char *hex,
  68                          const char *prefix, const char *filename)
  69 {
  70         int fnl = strlen(filename);
  71         int f;
  72         for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
  73                 const struct snapshot_archive_t* sat = &snapshot_archives[f];
  74                 int sl = strlen(sat->suffix);
  75                 if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
  76                         continue;
  77
  78                 struct archiver_args args;
  79                 struct commit *commit;
  80                 unsigned char sha1[20];
  81
  82                 if(get_sha1(hex, sha1)) {
  83                         cgit_print_error(fmt("Bad object id: %s", hex));
  84                         return;
  85                 }
  86                 commit = lookup_commit_reference(sha1);
  87
  88                 if(!commit) {
  89                         cgit_print_error(fmt("Not a commit reference: %s", hex));
  90                         return;;
  91                 }
  92
  93                 memset(&args,0,sizeof(args));
  94                 args.base = fmt("%s/", prefix);
  95                 args.tree = commit->tree;
  96
  97                 cgit_print_snapshot_start(sat->mimetype, filename, item);
  98                 (*sat->write_func)(&args);
  99                 return;
 100         }
 101         cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
 102 }
 103
 104 void cgit_print_snapshot_links(const char *repo,const char *hex)
 105 {
 106         char *filename;
 107         int f;
 108         for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
 109                 const struct snapshot_archive_t* sat = &snapshot_archives[f];
 110                 filename = fmt("%s-%s%s",repo,hex,sat->suffix);
 111                 htmlf("<a href='%s'>%s</a><br/>",
 112                         cgit_pageurl(repo,"snapshot",
 113                             fmt("id=%s&amp;name=%s",hex,filename)), filename);
 114         }
 115 }
 116 /* vim:set sw=8: */