merge-index.c

   1 #include <sys/types.h>
   2 #include <sys/wait.h>
   3 #include <signal.h>
   4
   5 #include "cache.h"
   6
   7 static const char *pgm = NULL;
   8 static const char *arguments[8];
   9 static int one_shot, quiet;
  10 static int err;
  11
  12 static void run_program(void)
  13 {
  14         int pid = fork(), status;
  15
  16         if (pid < 0)
  17                 die("unable to fork");
  18         if (!pid) {
  19                 execlp(pgm, arguments[0],
  20                             arguments[1],
  21                             arguments[2],
  22                             arguments[3],
  23                             arguments[4],
  24                             arguments[5],
  25                             arguments[6],
  26                             arguments[7],
  27                             NULL);
  28                 die("unable to execute '%s'", pgm);
  29         }
  30         if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) || WEXITSTATUS(status)) {
  31                 if (one_shot) {
  32                         err++;
  33                 } else {
  34                         if (!quiet)
  35                                 die("merge program failed");
  36                         exit(1);
  37                 }
  38         }
  39 }
  40
  41 static int merge_entry(int pos, const char *path)
  42 {
  43         int found;
  44
  45         if (pos >= active_nr)
  46                 die("git-merge-index: %s not in the cache", path);
  47         arguments[0] = pgm;
  48         arguments[1] = "";
  49         arguments[2] = "";
  50         arguments[3] = "";
  51         arguments[4] = path;
  52         arguments[5] = "";
  53         arguments[6] = "";
  54         arguments[7] = "";
  55         found = 0;
  56         do {
  57                 static char hexbuf[4][60];
  58                 static char ownbuf[4][60];
  59                 struct cache_entry *ce = active_cache[pos];
  60                 int stage = ce_stage(ce);
  61
  62                 if (strcmp(ce->name, path))
  63                         break;
  64                 found++;
  65                 strcpy(hexbuf[stage], sha1_to_hex(ce->sha1));
  66                 sprintf(ownbuf[stage], "%o", ntohl(ce->ce_mode) & (~S_IFMT));
  67                 arguments[stage] = hexbuf[stage];
  68                 arguments[stage + 4] = ownbuf[stage];
  69         } while (++pos < active_nr);
  70         if (!found)
  71                 die("git-merge-index: %s not in the cache", path);
  72         run_program();
  73         return found;
  74 }
  75
  76 static void merge_file(const char *path)
  77 {
  78         int pos = cache_name_pos(path, strlen(path));
  79
  80         /*
  81          * If it already exists in the cache as stage0, it's
  82          * already merged and there is nothing to do.
  83          */
  84         if (pos < 0)
  85                 merge_entry(-pos-1, path);
  86 }
  87
  88 static void merge_all(void)
  89 {
  90         int i;
  91         for (i = 0; i < active_nr; i++) {
  92                 struct cache_entry *ce = active_cache[i];
  93                 if (!ce_stage(ce))
  94                         continue;
  95                 i += merge_entry(i, ce->name)-1;
  96         }
  97 }
  98
  99 int main(int argc, char **argv)
 100 {
 101         int i, force_file = 0;
 102
 103         /* Without this we cannot rely on waitpid() to tell
 104          * what happened to our children.
 105          */
 106         signal(SIGCHLD, SIG_DFL);
 107
 108         if (argc < 3)
 109                 usage("git-merge-index [-o] [-q] <merge-program> (-a | <filename>*)");
 110
 111         setup_git_directory();
 112         read_cache();
 113
 114         i = 1;
 115         if (!strcmp(argv[i], "-o")) {
 116                 one_shot = 1;
 117                 i++;
 118         }
 119         if (!strcmp(argv[i], "-q")) {
 120                 quiet = 1;
 121                 i++;
 122         }
 123         pgm = argv[i++];
 124         for (; i < argc; i++) {
 125                 char *arg = argv[i];
 126                 if (!force_file && *arg == '-') {
 127                         if (!strcmp(arg, "--")) {
 128                                 force_file = 1;
 129                                 continue;
 130                         }
 131                         if (!strcmp(arg, "-a")) {
 132                                 merge_all();
 133                                 continue;
 134                         }
 135                         die("git-merge-index: unknown option %s", arg);
 136                 }
 137                 merge_file(arg);
 138         }
 139         if (err && !quiet)
 140                 die("merge program failed");
 141         return err;
 142 }