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128 lines
2.5 KiB
128 lines
2.5 KiB
20 years ago
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#include <sys/types.h>
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#include <sys/wait.h>
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#include "cache.h"
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static const char *pgm = NULL;
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static const char *arguments[5];
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static void run_program(void)
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{
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int pid = fork(), status;
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if (pid < 0)
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die("unable to fork");
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if (!pid) {
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execlp(pgm, arguments[0],
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arguments[1],
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arguments[2],
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arguments[3],
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arguments[4],
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NULL);
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die("unable to execute '%s'", pgm);
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}
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if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) || WEXITSTATUS(status))
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die("merge program failed");
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}
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static char *create_temp_file(int stage, unsigned char *sha1)
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{
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static char template[4][50];
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char *path = template[stage];
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void *buf;
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char type[100];
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unsigned long size;
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int fd;
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buf = read_sha1_file(sha1, type, &size);
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if (!buf || strcmp(type, "blob"))
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die("unable to read blob object %s", sha1_to_hex(sha1));
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strcpy(path, ".merge_file_XXXXXX");
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fd = mkstemp(path);
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if (fd < 0)
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die("unable to create temp-file");
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if (write(fd, buf, size) != size)
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die("unable to write temp-file");
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close(fd);
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return path;
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}
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static int merge_entry(int pos, const char *path)
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{
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int found;
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if (pos >= active_nr)
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die("merge-cache: %s not in the cache", path);
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arguments[0] = pgm;
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arguments[1] = "";
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arguments[2] = "";
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arguments[3] = "";
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arguments[4] = path;
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found = 0;
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do {
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struct cache_entry *ce = active_cache[pos];
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int stage = ce_stage(ce);
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if (strcmp(ce->name, path))
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break;
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found++;
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arguments[stage] = create_temp_file(stage, ce->sha1);
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} while (++pos < active_nr);
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if (!found)
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die("merge-cache: %s not in the cache", path);
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run_program();
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return found;
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}
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static void merge_file(const char *path)
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{
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int pos = cache_name_pos(path, strlen(path));
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/*
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* If it already exists in the cache as stage0, it's
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* already merged and there is nothing to do.
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*/
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if (pos < 0)
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merge_entry(-pos-1, path);
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}
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static void merge_all(void)
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{
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int i;
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for (i = 0; i < active_nr; i++) {
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struct cache_entry *ce = active_cache[i];
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if (!ce_stage(ce))
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continue;
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i += merge_entry(i, ce->name)-1;
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}
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}
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int main(int argc, char **argv)
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{
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int i, force_file = 0;
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if (argc < 3)
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usage("merge-cache <merge-program> (-a | <filename>*)");
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read_cache();
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pgm = argv[1];
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for (i = 2; i < argc; i++) {
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char *arg = argv[i];
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if (!force_file && *arg == '-') {
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if (!strcmp(arg, "--")) {
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force_file = 1;
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continue;
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}
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if (!strcmp(arg, "-a")) {
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merge_all();
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continue;
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}
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die("merge-cache: unknown option %s", arg);
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}
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merge_file(arg);
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}
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return 0;
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}
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