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 #include "ui-shared.h"
  12
  13 static int write_compressed_tar_archive(struct archiver_args *args,const char *filter)
  14 {
  15         int rw[2];
  16         pid_t gzpid;
  17         int stdout2;
  18         int status;
  19         int rv;
  20
  21         stdout2 = chk_non_negative(dup(STDIN_FILENO), "Preserving STDOUT before compressing");
  22         chk_zero(pipe(rw), "Opening pipe from compressor subprocess");
  23         gzpid = chk_non_negative(fork(), "Forking compressor subprocess");
  24         if(gzpid==0) {
  25                 /* child */
  26                 chk_zero(close(rw[1]), "Closing write end of pipe in child");
  27                 chk_zero(close(STDIN_FILENO), "Closing STDIN");
  28                 chk_non_negative(dup2(rw[0],STDIN_FILENO), "Redirecting compressor input to stdin");
  29                 execlp(filter,filter,NULL);
  30                 _exit(-1);
  31         }
  32         /* parent */
  33         chk_zero(close(rw[0]), "Closing read end of pipe");
  34         chk_non_negative(dup2(rw[1],STDOUT_FILENO), "Redirecting output to compressor");
  35
  36         rv = write_tar_archive(args);
  37
  38         chk_zero(close(STDOUT_FILENO), "Closing STDOUT redirected to compressor");
  39         chk_non_negative(dup2(stdout2,STDOUT_FILENO), "Restoring uncompressed STDOUT");
  40         chk_zero(close(stdout2), "Closing uncompressed STDOUT");
  41         chk_zero(close(rw[1]), "Closing write end of pipe in parent");
  42         chk_positive(waitpid(gzpid,&status,0), "Waiting on compressor process");
  43         if(! ( WIFEXITED(status) && WEXITSTATUS(status)==0 ) )
  44                 cgit_print_error("Failed to compress archive");
  45
  46         return rv;
  47 }
  48
  49 static int write_tar_gzip_archive(struct archiver_args *args)
  50 {
  51         return write_compressed_tar_archive(args,"gzip");
  52 }
  53
  54 static int write_tar_bzip2_archive(struct archiver_args *args)
  55 {
  56         return write_compressed_tar_archive(args,"bzip2");
  57 }
  58
  59 const struct cgit_snapshot_format cgit_snapshot_formats[] = {
  60         { ".zip", "application/x-zip", write_zip_archive, 0x1 },
  61         { ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
  62         { ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
  63         { ".tar", "application/x-tar", write_tar_archive, 0x8 },
  64         {}
  65 };
  66
  67 static int make_snapshot(const struct cgit_snapshot_format *format,
  68                          const char *hex, const char *prefix,
  69                          const char *filename)
  70 {
  71         struct archiver_args args;
  72         struct commit *commit;
  73         unsigned char sha1[20];
  74
  75         if(get_sha1(hex, sha1)) {
  76                 cgit_print_error(fmt("Bad object id: %s", hex));
  77                 return 1;
  78         }
  79         commit = lookup_commit_reference(sha1);
  80         if(!commit) {
  81                 cgit_print_error(fmt("Not a commit reference: %s", hex));
  82                 return 1;
  83         }
  84         memset(&args, 0, sizeof(args));
  85         args.base = fmt("%s/", prefix);
  86         args.tree = commit->tree;
  87         args.time = commit->date;
  88         ctx.page.mimetype = xstrdup(format->mimetype);
  89         ctx.page.filename = xstrdup(filename);
  90         cgit_print_http_headers(&ctx);
  91         format->write_func(&args);
  92         return 0;
  93 }
  94
  95 void cgit_print_snapshot(const char *head, const char *hex, const char *prefix,
  96                          const char *filename, int snapshots)
  97 {
  98         const struct cgit_snapshot_format* f;
  99         int sl, fnl;
 100
 101         fnl = strlen(filename);
 102         if (!hex)
 103                 hex = head;
 104         for (f = cgit_snapshot_formats; f->suffix; f++) {
 105                 if (!(snapshots & f->bit))
 106                         continue;
 107                 sl = strlen(f->suffix);
 108                 if(fnl < sl || strcmp(&filename[fnl-sl], f->suffix))
 109                         continue;
 110                 make_snapshot(f, hex, prefix, filename);
 111                 return;
 112         }
 113         cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
 114 }