diff options
| -rw-r--r-- | Makefile | 5 | ||||
| -rw-r--r-- | merge-cache.c | 127 |
2 files changed, 131 insertions, 1 deletions
@@ -14,7 +14,7 @@ CC=gcc PROG= update-cache show-diff init-db write-tree read-tree commit-tree \ cat-file fsck-cache checkout-cache diff-tree rev-tree show-files \ - check-files ls-tree merge-base + check-files ls-tree merge-base merge-cache all: $(PROG) @@ -67,6 +67,9 @@ ls-tree: ls-tree.o read-cache.o merge-base: merge-base.o read-cache.o $(CC) $(CFLAGS) -o merge-base merge-base.o read-cache.o $(LIBS) +merge-cache: merge-cache.o read-cache.o + $(CC) $(CFLAGS) -o merge-cache merge-cache.o read-cache.o $(LIBS) + read-cache.o: cache.h show-diff.o: cache.h diff --git a/merge-cache.c b/merge-cache.c new file mode 100644 index 0000000..3aa391b --- /dev/null +++ b/merge-cache.c @@ -0,0 +1,127 @@ +#include <sys/types.h> +#include <sys/wait.h> + +#include "cache.h" + +static const char *pgm = NULL; +static const char *arguments[5]; + +static void run_program(void) +{ + int pid = fork(), status; + + if (pid < 0) + die("unable to fork"); + if (!pid) { + execlp(pgm, arguments[0], + arguments[1], + arguments[2], + arguments[3], + arguments[4], + NULL); + die("unable to execute '%s'", pgm); + } + if (waitpid(pid, &status, 0) < 0 || !WIFEXITED(status) || WEXITSTATUS(status)) + die("merge program failed"); +} + +static char *create_temp_file(int stage, unsigned char *sha1) +{ + static char template[4][50]; + char *path = template[stage]; + void *buf; + char type[100]; + unsigned long size; + int fd; + + buf = read_sha1_file(sha1, type, &size); + if (!buf || strcmp(type, "blob")) + die("unable to read blob object %s", sha1_to_hex(sha1)); + + strcpy(path, ".merge_file_XXXXXX"); + fd = mkstemp(path); + if (fd < 0) + die("unable to create temp-file"); + if (write(fd, buf, size) != size) + die("unable to write temp-file"); + close(fd); + return path; +} + +static int merge_entry(int pos, const char *path) +{ + int found; + + if (pos >= active_nr) + die("merge-cache: %s not in the cache", path); + arguments[0] = pgm; + arguments[1] = ""; + arguments[2] = ""; + arguments[3] = ""; + arguments[4] = path; + found = 0; + do { + struct cache_entry *ce = active_cache[pos]; + int stage = ce_stage(ce); + + if (strcmp(ce->name, path)) + break; + found++; + arguments[stage] = create_temp_file(stage, ce->sha1); + } while (++pos < active_nr); + if (!found) + die("merge-cache: %s not in the cache", path); + run_program(); + return found; +} + +static void merge_file(const char *path) +{ + int pos = cache_name_pos(path, strlen(path)); + + /* + * If it already exists in the cache as stage0, it's + * already merged and there is nothing to do. + */ + if (pos < 0) + merge_entry(-pos-1, path); +} + +static void merge_all(void) +{ + int i; + for (i = 0; i < active_nr; i++) { + struct cache_entry *ce = active_cache[i]; + if (!ce_stage(ce)) + continue; + i += merge_entry(i, ce->name)-1; + } +} + +int main(int argc, char **argv) +{ + int i, force_file = 0; + + if (argc < 3) + usage("merge-cache <merge-program> (-a | <filename>*)"); + + read_cache(); + + pgm = argv[1]; + for (i = 2; i < argc; i++) { + char *arg = argv[i]; + if (!force_file && *arg == '-') { + if (!strcmp(arg, "--")) { + force_file = 1; + continue; + } + if (!strcmp(arg, "-a")) { + merge_all(); + continue; + } + die("merge-cache: unknown option %s", arg); + } + merge_file(arg); + } + return 0; +} |