ls-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 int line_termination = '\n';
   9 int recursive = 0;
  10
  11 struct path_prefix {
  12         struct path_prefix *prev;
  13         const char *name;
  14 };
  15
  16 static void print_path_prefix(struct path_prefix *prefix)
  17 {
  18         if (prefix) {
  19                 if (prefix->prev)
  20                         print_path_prefix(prefix->prev);
  21                 fputs(prefix->name, stdout);
  22                 putchar('/');
  23         }
  24 }
  25
  26 static void list_recursive(void *buffer,
  27                           unsigned char *type,
  28                           unsigned long size,
  29                           struct path_prefix *prefix)
  30 {
  31         struct path_prefix this_prefix;
  32         this_prefix.prev = prefix;
  33
  34         if (strcmp(type, "tree"))
  35                 die("expected a 'tree' node");
  36
  37         while (size) {
  38                 int namelen = strlen(buffer)+1;
  39                 void *eltbuf;
  40                 char elttype[20];
  41                 unsigned long eltsize;
  42                 unsigned char *sha1 = buffer + namelen;
  43                 char *path = strchr(buffer, ' ') + 1;
  44                 unsigned int mode;
  45
  46                 if (size < namelen + 20 || sscanf(buffer, "%o", &mode) != 1)
  47                         die("corrupt 'tree' file");
  48                 buffer = sha1 + 20;
  49                 size -= namelen + 20;
  50
  51                 /* XXX: We do some ugly mode heuristics here.
  52                  * It seems not worth it to read each file just to get this
  53                  * and the file size. -- pasky@ucw.cz
  54                  * ... that is, when we are not recursive -- junkio@cox.net
  55                  */
  56                 eltbuf = (recursive ? read_sha1_file(sha1, elttype, &eltsize) :
  57                           NULL);
  58                 if (! eltbuf) {
  59                         if (recursive)
  60                                 error("cannot read %s", sha1_to_hex(sha1));
  61                         type = S_ISDIR(mode) ? "tree" : "blob";
  62                 }
  63                 else
  64                         type = elttype;
  65
  66                 printf("%03o\t%s\t%s\t", mode, type, sha1_to_hex(sha1));
  67                 print_path_prefix(prefix);
  68                 fputs(path, stdout);
  69                 putchar(line_termination);
  70
  71                 if (eltbuf && !strcmp(type, "tree")) {
  72                         this_prefix.name = path;
  73                         list_recursive(eltbuf, elttype, eltsize, &this_prefix);
  74                 }
  75                 free(eltbuf);
  76         }
  77 }
  78
  79 static int list(unsigned char *sha1)
  80 {
  81         void *buffer;
  82         unsigned long size;
  83         char type[20];
  84
  85         buffer = read_sha1_file(sha1, type, &size);
  86         if (!buffer)
  87                 die("unable to read sha1 file");
  88         list_recursive(buffer, type, size, NULL);
  89         return 0;
  90 }
  91
  92 static void _usage(void)
  93 {
  94         usage("ls-tree [-r] [-z] <key>");
  95 }
  96
  97 int main(int argc, char **argv)
  98 {
  99         unsigned char sha1[20];
 100
 101         while (1 < argc && argv[1][0] == '-') {
 102                 switch (argv[1][1]) {
 103                 case 'z':
 104                         line_termination = 0;
 105                         break;
 106                 case 'r':
 107                         recursive = 1;
 108                         break;
 109                 default:
 110                         _usage();
 111                 }
 112                 argc--; argv++;
 113         }
 114
 115         if (argc != 2)
 116                 _usage();
 117         if (get_sha1_hex(argv[1], sha1) < 0)
 118                 _usage();
 119         sha1_file_directory = getenv(DB_ENVIRONMENT);
 120         if (!sha1_file_directory)
 121                 sha1_file_directory = DEFAULT_DB_ENVIRONMENT;
 122         if (list(sha1) < 0)
 123                 die("list failed");
 124         return 0;
 125 }