merge-cache.c

   1 #include <sys/types.h>
   2 #include <sys/wait.h>
   3
   4 #include "cache.h"
   5
   6 static const char *pgm = NULL;
   7 static const char *arguments[8];
   8 static int one_shot;
   9 static int err;
  10
  11 static void run_program(void)
  12 {
  13         int pid = fork(), status;
  14
  15         if (pid < 0)
  16                 die("unable to fork");
  17         if (!pid) {
  18                 execlp(pgm, arguments[0],
  19                             arguments[1],
  20                             arguments[2],
  21                             arguments[3],
  22                             arguments[4],
  23                             arguments[5],
  24                             arguments[6],
  25                             arguments[7],
  26                             NULL);
  27                 die("unable to execute '%s'", pgm);
  28         }
  29         if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) || WEXITSTATUS(status)) {
  30                 if (one_shot)
  31                         err++;
  32                 else
  33                         die("merge program failed");
  34         }
  35 }
  36
  37 static int merge_entry(int pos, const char *path)
  38 {
  39         int found;
  40
  41         if (pos >= active_nr)
  42                 die("merge-cache: %s not in the cache", path);
  43         arguments[0] = pgm;
  44         arguments[1] = "";
  45         arguments[2] = "";
  46         arguments[3] = "";
  47         arguments[4] = path;
  48         arguments[5] = "";
  49         arguments[6] = "";
  50         arguments[7] = "";
  51         found = 0;
  52         do {
  53                 static char hexbuf[4][60];
  54                 static char ownbuf[4][60];
  55                 struct cache_entry *ce = active_cache[pos];
  56                 int stage = ce_stage(ce);
  57
  58                 if (strcmp(ce->name, path))
  59                         break;
  60                 found++;
  61                 strcpy(hexbuf[stage], sha1_to_hex(ce->sha1));
  62                 sprintf(ownbuf[stage], "%o", ntohl(ce->ce_mode) & (~S_IFMT));
  63                 arguments[stage] = hexbuf[stage];
  64                 arguments[stage + 4] = ownbuf[stage];
  65         } while (++pos < active_nr);
  66         if (!found)
  67                 die("merge-cache: %s not in the cache", path);
  68         run_program();
  69         return found;
  70 }
  71
  72 static void merge_file(const char *path)
  73 {
  74         int pos = cache_name_pos(path, strlen(path));
  75
  76         /*
  77          * If it already exists in the cache as stage0, it's
  78          * already merged and there is nothing to do.
  79          */
  80         if (pos < 0)
  81                 merge_entry(-pos-1, path);
  82 }
  83
  84 static void merge_all(void)
  85 {
  86         int i;
  87         for (i = 0; i < active_nr; i++) {
  88                 struct cache_entry *ce = active_cache[i];
  89                 if (!ce_stage(ce))
  90                         continue;
  91                 i += merge_entry(i, ce->name)-1;
  92         }
  93 }
  94
  95 int main(int argc, char **argv)
  96 {
  97         int i, force_file = 0;
  98
  99         if (argc < 3)
 100                 usage("merge-cache [-o] <merge-program> (-a | <filename>*)");
 101
 102         read_cache();
 103
 104         i = 1;
 105         if (!strcmp(argv[1], "-o")) {
 106                 one_shot = 1;
 107                 i++;
 108         }
 109         pgm = argv[i++];
 110         for (; i < argc; i++) {
 111                 char *arg = argv[i];
 112                 if (!force_file && *arg == '-') {
 113                         if (!strcmp(arg, "--")) {
 114                                 force_file = 1;
 115                                 continue;
 116                         }
 117                         if (!strcmp(arg, "-a")) {
 118                                 merge_all();
 119                                 continue;
 120                         }
 121                         die("merge-cache: unknown option %s", arg);
 122                 }
 123                 merge_file(arg);
 124         }
 125         if (err)
 126                 die("merge program failed");
 127         return 0;
 128 }