Andrew's git - gitweb.git/blob

   1#include <sys/types.h>
   2#include <dirent.h>
   3#include "cache.h"
   4#include "blob.h"
   5
   6static void create_directories(const char *path, struct checkout *state)
   7{
   8        int len = strlen(path);
   9        char *buf = xmalloc(len + 1);
  10        const char *slash = path;
  11
  12        while ((slash = strchr(slash+1, '/')) != NULL) {
  13                len = slash - path;
  14                memcpy(buf, path, len);
  15                buf[len] = 0;
  16                if (mkdir(buf, 0777)) {
  17                        if (errno == EEXIST) {
  18                                struct stat st;
  19                                if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
  20                                        continue;
  21                                if (!stat(buf, &st) && S_ISDIR(st.st_mode))
  22                                        continue; /* ok */
  23                        }
  24                        die("cannot create directory at %s", buf);
  25                }
  26        }
  27        free(buf);
  28}
  29
  30static void remove_subtree(const char *path)
  31{
  32        DIR *dir = opendir(path);
  33        struct dirent *de;
  34        char pathbuf[PATH_MAX];
  35        char *name;
  36        
  37        if (!dir)
  38                die("cannot opendir %s", path);
  39        strcpy(pathbuf, path);
  40        name = pathbuf + strlen(path);
  41        *name++ = '/';
  42        while ((de = readdir(dir)) != NULL) {
  43                struct stat st;
  44                if ((de->d_name[0] == '.') &&
  45                    ((de->d_name[1] == 0) ||
  46                     ((de->d_name[1] == '.') && de->d_name[2] == 0)))
  47                        continue;
  48                strcpy(name, de->d_name);
  49                if (lstat(pathbuf, &st))
  50                        die("cannot lstat %s", pathbuf);
  51                if (S_ISDIR(st.st_mode))
  52                        remove_subtree(pathbuf);
  53                else if (unlink(pathbuf))
  54                        die("cannot unlink %s", pathbuf);
  55        }
  56        closedir(dir);
  57        if (rmdir(path))
  58                die("cannot rmdir %s", path);
  59}
  60
  61static int create_file(const char *path, unsigned int mode)
  62{
  63        mode = (mode & 0100) ? 0777 : 0666;
  64        return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
  65}
  66
  67static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
  68{
  69        int fd;
  70        void *new;
  71        unsigned long size;
  72        long wrote;
  73        char type[20];
  74
  75        new = read_sha1_file(ce->sha1, type, &size);
  76        if (!new || strcmp(type, blob_type)) {
  77                if (new)
  78                        free(new);
  79                return error("git-checkout-index: unable to read sha1 file of %s (%s)",
  80                        path, sha1_to_hex(ce->sha1));
  81        }
  82        switch (ntohl(ce->ce_mode) & S_IFMT) {
  83        case S_IFREG:
  84                if (to_tempfile) {
  85                        strcpy(path, ".merge_file_XXXXXX");
  86                        fd = mkstemp(path);
  87                } else
  88                        fd = create_file(path, ntohl(ce->ce_mode));
  89                if (fd < 0) {
  90                        free(new);
  91                        return error("git-checkout-index: unable to create file %s (%s)",
  92                                path, strerror(errno));
  93                }
  94                wrote = write(fd, new, size);
  95                close(fd);
  96                free(new);
  97                if (wrote != size)
  98                        return error("git-checkout-index: unable to write file %s", path);
  99                break;
 100        case S_IFLNK:
 101                if (to_tempfile) {
 102                        strcpy(path, ".merge_link_XXXXXX");
 103                        fd = mkstemp(path);
 104                        if (fd < 0) {
 105                                free(new);
 106                                return error("git-checkout-index: unable to create "
 107                                                 "file %s (%s)", path, strerror(errno));
 108                        }
 109                        wrote = write(fd, new, size);
 110                        close(fd);
 111                        free(new);
 112                        if (wrote != size)
 113                                return error("git-checkout-index: unable to write file %s",
 114                                        path);
 115                } else {
 116                        wrote = symlink(new, path);
 117                        free(new);
 118                        if (wrote)
 119                                return error("git-checkout-index: unable to create "
 120                                                 "symlink %s (%s)", path, strerror(errno));
 121                }
 122                break;
 123        default:
 124                free(new);
 125                return error("git-checkout-index: unknown file mode for %s", path);
 126        }
 127
 128        if (state->refresh_cache) {
 129                struct stat st;
 130                lstat(ce->name, &st);
 131                fill_stat_cache_info(ce, &st);
 132        }
 133        return 0;
 134}
 135
 136int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
 137{
 138        static char path[PATH_MAX + 1];
 139        struct stat st;
 140        int len = state->base_dir_len;
 141
 142        if (topath)
 143                return write_entry(ce, topath, state, 1);
 144
 145        memcpy(path, state->base_dir, len);
 146        strcpy(path + len, ce->name);
 147
 148        if (!lstat(path, &st)) {
 149                unsigned changed = ce_match_stat(ce, &st, 1);
 150                if (!changed)
 151                        return 0;
 152                if (!state->force) {
 153                        if (!state->quiet)
 154                                fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 155                        return -1;
 156                }
 157
 158                /*
 159                 * We unlink the old file, to get the new one with the
 160                 * right permissions (including umask, which is nasty
 161                 * to emulate by hand - much easier to let the system
 162                 * just do the right thing)
 163                 */
 164                unlink(path);
 165                if (S_ISDIR(st.st_mode)) {
 166                        if (!state->force)
 167                                return error("%s is a directory", path);
 168                        remove_subtree(path);
 169                }
 170        } else if (state->not_new)
 171                return 0;
 172        create_directories(path, state);
 173        return write_entry(ce, path, state, 0);
 174}