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
  11 static int write_tar_gzip_archive(struct archiver_args *args)
  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("gzip","gzip",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 const struct snapshot_archive_t {
  48         const char *suffix;
  49         const char *mimetype;
  50         write_archive_fn_t write_func;
  51 }       snapshot_archives[] = {
  52         { ".zip", "application/x-zip", write_zip_archive },
  53         { ".tar.gz", "application/x-gzip", write_tar_gzip_archive }
  54 };
  55
  56 void cgit_print_snapshot(struct cacheitem *item, const char *hex,
  57                          const char *prefix, const char *filename)
  58 {
  59         int fnl = strlen(filename);
  60         int f;
  61         for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
  62                 const struct snapshot_archive_t* sat = &snapshot_archives[f];
  63                 int sl = strlen(sat->suffix);
  64                 if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
  65                         continue;
  66
  67                 struct archiver_args args;
  68                 struct commit *commit;
  69                 unsigned char sha1[20];
  70
  71                 if(get_sha1(hex, sha1)) {
  72                         cgit_print_error(fmt("Bad object id: %s", hex));
  73                         return;
  74                 }
  75                 commit = lookup_commit_reference(sha1);
  76
  77                 if(!commit) {
  78                         cgit_print_error(fmt("Not a commit reference: %s", hex));
  79                         return;;
  80                 }
  81
  82                 memset(&args,0,sizeof(args));
  83                 args.base = fmt("%s/", prefix);
  84                 args.tree = commit->tree;
  85
  86                 cgit_print_snapshot_start(sat->mimetype, filename, item);
  87                 (*sat->write_func)(&args);
  88                 return;
  89         }
  90         cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
  91 }
  92
  93 void cgit_print_snapshot_links(const char *repo,const char *hex)
  94 {
  95         char *filename;
  96         int f;
  97         for(f=0;f<(sizeof(snapshot_archives)/sizeof(*snapshot_archives));++f) {
  98                 const struct snapshot_archive_t* sat = &snapshot_archives[f];
  99                 filename = fmt("%s-%s%s",repo,hex,sat->suffix);
 100                 htmlf("<a href='%s'>%s</a><br/>",
 101                         cgit_pageurl(repo,"snapshot",
 102                             fmt("id=%s&amp;name=%s",hex,filename)), filename);
 103         }
 104 }