gitweb.ps.run Git - ps-cgit/blob - 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 #include "html.h"
  11
  12 static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
  13 {
  14         int rw[2];
  15         pid_t gzpid;
  16         int stdout2;
  17         int status;
  18         int rv;
  19
  20         stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
  21         chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
  22         gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
  23         if(gzpid==0) {
  24                 /* child */
  25                 chk_zero(close(rw[1]), "Closing write end of pipe in child");
  26                 chk_zero(close(STDIN_FILENO), "Closing STDIN");
  27                 chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
  28                 execlp(filter,filter,NULL);
  29                 _exit(-1);
  30         }
  31         /* parent */
  32         chk_zero(close(rw[0]), "Closing read end of pipe");
  33         chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
  34
  35         rv = write_tar_archive(args);
  36
  37         chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
  38         chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
  39         chk_zero(close(stdout2), "Closing uncompressed STDOUT");
  40         chk_zero(close(rw[1]), "Closing write end of pipe in parent");
  41         chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
  42         if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
  43                 cgit_print_error("Failed to compress archive");
  44
  45         return rv;
  46 }
  47
  48 static int write_tar_gzip_archive(struct archiver_args *args)
  49 {
  50         return write_compressed_tar_archive(args,"gzip");
  51 }
  52
  53 static int write_tar_bzip2_archive(struct archiver_args *args)
  54 {
  55         return write_compressed_tar_archive(args,"bzip2");
  56 }
  57
  58 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
  59         { ".zip", "application/x-zip", write_zip_archive, 0x1 },
  60         { ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
  61         { ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
  62         { ".tar", "application/x-tar", write_tar_archive, 0x8 },
  63         {}
  64 };
  65
  66 static int make_snapshot(const struct cgit_snapshot_format *format,
  67                          const char *hex, const char *prefix,
  68                          const char *filename)
  69 {
  70         struct archiver_args args;
  71         struct commit *commit;
  72         unsigned char sha1[20];
  73
  74         if(get_sha1(hex, sha1)) {
  75                 cgit_print_error(fmt("Bad object id: %s", hex));
  76                 return 1;
  77         }
  78         commit = lookup_commit_reference(sha1);
  79         if(!commit) {
  80                 cgit_print_error(fmt("Not a commit reference: %s", hex));
  81                 return 1;
  82         }
  83         memset(&args, 0, sizeof(args));
  84         args.base = fmt("%s/", prefix);
  85         args.tree = commit->tree;
  86         args.time = commit->date;
  87         ctx.page.mimetype = xstrdup(format->mimetype);
  88         ctx.page.filename = xstrdup(filename);
  89         cgit_print_http_headers(&ctx);
  90         format->write_func(&args);
  91         return 0;
  92 }
  93
  94 void cgit_print_snapshot(const char *head, const char *hex, const char *prefix,
  95                          const char *filename, int snapshots)
  96 {
  97         const struct cgit_snapshot_format* f;
  98         int sl, fnl;
  99
 100         fnl = strlen(filename);
 101         if (!hex)
 102                 hex = head;
 103         for (f = cgit_snapshot_formats; f->suffix; f++) {
 104                 if (!(snapshots & f->bit))
 105                         continue;
 106                 sl = strlen(f->suffix);
 107                 if(fnl < sl || strcmp(&filename[fnl-sl], f->suffix))
 108                         continue;
 109                 make_snapshot(f, hex, prefix, filename);
 110                 return;
 111         }
 112         cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
 113 }