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 static const struct snapshot_archive_t {
  59         const char *suffix;
  60         const char *mimetype;
  61         write_archive_fn_t write_func;
  62         int bit;
  63 }       snapshot_archives[] = {
  64         { ".zip", "application/x-zip", write_zip_archive, 0x1 },
  65         { ".tar.gz", "application/x-tar", write_tar_gzip_archive, 0x2 },
  66         { ".tar.bz2", "application/x-tar", write_tar_bzip2_archive, 0x4 },
  67         { ".tar", "application/x-tar", write_tar_archive, 0x8 }
  68 };
  69
  70 #define snapshot_archives_len (sizeof(snapshot_archives) / sizeof(*snapshot_archives))
  71
  72 void cgit_print_snapshot(struct cacheitem *item, const char *head,
  73                          const char *hex, const char *prefix,
  74                          const char *filename, int snapshots)
  75 {
  76         const struct snapshot_archive_t* sat;
  77         struct archiver_args args;
  78         struct commit *commit;
  79         unsigned char sha1[20];
  80         int f, sl, fnl = strlen(filename);
  81
  82         for(f=0; f<snapshot_archives_len; f++) {
  83                 sat = &snapshot_archives[f];
  84                 if(!(snapshots & sat->bit))
  85                         continue;
  86                 sl = strlen(sat->suffix);
  87                 if(fnl<sl || strcmp(&filename[fnl-sl],sat->suffix))
  88                         continue;
  89                 if (!hex)
  90                         hex = head;
  91                 if(get_sha1(hex, sha1)) {
  92                         cgit_print_error(fmt("Bad object id: %s", hex));
  93                         return;
  94                 }
  95                 commit = lookup_commit_reference(sha1);
  96                 if(!commit) {
  97                         cgit_print_error(fmt("Not a commit reference: %s", hex));
  98                         return;;
  99                 }
 100                 memset(&args,0,sizeof(args));
 101                 args.base = fmt("%s/", prefix);
 102                 args.tree = commit->tree;
 103                 args.time = commit->date;
 104                 cgit_print_snapshot_start(sat->mimetype, filename, item);
 105                 (*sat->write_func)(&args);
 106                 return;
 107         }
 108         cgit_print_error(fmt("Unsupported snapshot format: %s", filename));
 109 }
 110
 111 void cgit_print_snapshot_links(const char *repo, const char *head,
 112                                const char *hex, int snapshots)
 113 {
 114         const struct snapshot_archive_t* sat;
 115         char *filename;
 116         int f;
 117
 118         for(f=0; f<snapshot_archives_len; f++) {
 119                 sat = &snapshot_archives[f];
 120                 if(!(snapshots & sat->bit))
 121                         continue;
 122                 filename = fmt("%s-%s%s", cgit_repobasename(repo), hex,
 123                                sat->suffix);
 124                 cgit_snapshot_link(filename, NULL, NULL, (char *)head,
 125                                    (char *)hex, filename);
 126                 html("<br/>");
 127         }
 128 }
 129
 130 int cgit_parse_snapshots_mask(const char *str)
 131 {
 132         const struct snapshot_archive_t* sat;
 133         static const char *delim = " \t,:/|;";
 134         int f, tl, sl, rv = 0;
 135
 136         /* favor legacy setting */
 137         if(atoi(str))
 138                 return 1;
 139         for(;;) {
 140                 str += strspn(str,delim);
 141                 tl = strcspn(str,delim);
 142                 if(!tl)
 143                         break;
 144                 for(f=0; f<snapshot_archives_len; f++) {
 145                         sat = &snapshot_archives[f];
 146                         sl = strlen(sat->suffix);
 147                         if((tl == sl && !strncmp(sat->suffix, str, tl)) ||
 148                            (tl == sl-1 && !strncmp(sat->suffix+1, str, tl-1))) {
 149                                 rv |= sat->bit;
 150                                 break;
 151                         }
 152                 }
 153                 str += tl;
 154         }
 155         return rv;
 156 }
 157
 158 /* vim:set sw=8: */