merge-index.c

   1 #include "cache.h"
   2
   3 static const char *pgm;
   4 static const char *arguments[8];
   5 static int one_shot, quiet;
   6 static int err;
   7
   8 static void run_program(void)
   9 {
  10         pid_t pid = fork();
  11         int status;
  12
  13         if (pid < 0)
  14                 die("unable to fork");
  15         if (!pid) {
  16                 execlp(pgm, arguments[0],
  17                             arguments[1],
  18                             arguments[2],
  19                             arguments[3],
  20                             arguments[4],
  21                             arguments[5],
  22                             arguments[6],
  23                             arguments[7],
  24                             NULL);
  25                 die("unable to execute '%s'", pgm);
  26         }
  27         if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) || WEXITSTATUS(status)) {
  28                 if (one_shot) {
  29                         err++;
  30                 } else {
  31                         if (!quiet)
  32                                 die("merge program failed");
  33                         exit(1);
  34                 }
  35         }
  36 }
  37
  38 static int merge_entry(int pos, const char *path)
  39 {
  40         int found;
  41
  42         if (pos >= active_nr)
  43                 die("git-merge-index: %s not in the cache", path);
  44         arguments[0] = pgm;
  45         arguments[1] = "";
  46         arguments[2] = "";
  47         arguments[3] = "";
  48         arguments[4] = path;
  49         arguments[5] = "";
  50         arguments[6] = "";
  51         arguments[7] = "";
  52         found = 0;
  53         do {
  54                 static char hexbuf[4][60];
  55                 static char ownbuf[4][60];
  56                 struct cache_entry *ce = active_cache[pos];
  57                 int stage = ce_stage(ce);
  58
  59                 if (strcmp(ce->name, path))
  60                         break;
  61                 found++;
  62                 strcpy(hexbuf[stage], sha1_to_hex(ce->sha1));
  63                 sprintf(ownbuf[stage], "%o", ntohl(ce->ce_mode) & (~S_IFMT));
  64                 arguments[stage] = hexbuf[stage];
  65                 arguments[stage + 4] = ownbuf[stage];
  66         } while (++pos < active_nr);
  67         if (!found)
  68                 die("git-merge-index: %s not in the cache", path);
  69         run_program();
  70         return found;
  71 }
  72
  73 static void merge_file(const char *path)
  74 {
  75         int pos = cache_name_pos(path, strlen(path));
  76
  77         /*
  78          * If it already exists in the cache as stage0, it's
  79          * already merged and there is nothing to do.
  80          */
  81         if (pos < 0)
  82                 merge_entry(-pos-1, path);
  83 }
  84
  85 static void merge_all(void)
  86 {
  87         int i;
  88         for (i = 0; i < active_nr; i++) {
  89                 struct cache_entry *ce = active_cache[i];
  90                 if (!ce_stage(ce))
  91                         continue;
  92                 i += merge_entry(i, ce->name)-1;
  93         }
  94 }
  95
  96 int main(int argc, char **argv)
  97 {
  98         int i, force_file = 0;
  99
 100         /* Without this we cannot rely on waitpid() to tell
 101          * what happened to our children.
 102          */
 103         signal(SIGCHLD, SIG_DFL);
 104
 105         if (argc < 3)
 106                 usage("git-merge-index [-o] [-q] <merge-program> (-a | <filename>*)");
 107
 108         setup_git_directory();
 109         read_cache();
 110
 111         i = 1;
 112         if (!strcmp(argv[i], "-o")) {
 113                 one_shot = 1;
 114                 i++;
 115         }
 116         if (!strcmp(argv[i], "-q")) {
 117                 quiet = 1;
 118                 i++;
 119         }
 120         pgm = argv[i++];
 121         for (; i < argc; i++) {
 122                 char *arg = argv[i];
 123                 if (!force_file && *arg == '-') {
 124                         if (!strcmp(arg, "--")) {
 125                                 force_file = 1;
 126                                 continue;
 127                         }
 128                         if (!strcmp(arg, "-a")) {
 129                                 merge_all();
 130                                 continue;
 131                         }
 132                         die("git-merge-index: unknown option %s", arg);
 133                 }
 134                 merge_file(arg);
 135         }
 136         if (err && !quiet)
 137                 die("merge program failed");
 138         return err;
 139 }