Andrew's git - gitweb.git/blob

   1#include <sys/types.h>
   2#include <dirent.h>
   3#include "cache.h"
   4
   5static void create_directories(const char *path, struct checkout *state)
   6{
   7        int len = strlen(path);
   8        char *buf = xmalloc(len + 1);
   9        const char *slash = path;
  10
  11        while ((slash = strchr(slash+1, '/')) != NULL) {
  12                len = slash - path;
  13                memcpy(buf, path, len);
  14                buf[len] = 0;
  15                if (mkdir(buf, 0777)) {
  16                        if (errno == EEXIST) {
  17                                struct stat st;
  18                                if (len > state->base_dir_len && state->force && !unlink(buf) && !mkdir(buf, 0777))
  19                                        continue;
  20                                if (!stat(buf, &st) && S_ISDIR(st.st_mode))
  21                                        continue; /* ok */
  22                        }
  23                        die("cannot create directory at %s", buf);
  24                }
  25        }
  26        free(buf);
  27}
  28
  29static void remove_subtree(const char *path)
  30{
  31        DIR *dir = opendir(path);
  32        struct dirent *de;
  33        char pathbuf[PATH_MAX];
  34        char *name;
  35        
  36        if (!dir)
  37                die("cannot opendir %s", path);
  38        strcpy(pathbuf, path);
  39        name = pathbuf + strlen(path);
  40        *name++ = '/';
  41        while ((de = readdir(dir)) != NULL) {
  42                struct stat st;
  43                if ((de->d_name[0] == '.') &&
  44                    ((de->d_name[1] == 0) ||
  45                     ((de->d_name[1] == '.') && de->d_name[2] == 0)))
  46                        continue;
  47                strcpy(name, de->d_name);
  48                if (lstat(pathbuf, &st))
  49                        die("cannot lstat %s", pathbuf);
  50                if (S_ISDIR(st.st_mode))
  51                        remove_subtree(pathbuf);
  52                else if (unlink(pathbuf))
  53                        die("cannot unlink %s", pathbuf);
  54        }
  55        closedir(dir);
  56        if (rmdir(path))
  57                die("cannot rmdir %s", path);
  58}
  59
  60static int create_file(const char *path, unsigned int mode)
  61{
  62        mode = (mode & 0100) ? 0777 : 0666;
  63        return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
  64}
  65
  66static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
  67{
  68        int fd;
  69        void *new;
  70        unsigned long size;
  71        long wrote;
  72        char type[20];
  73
  74        new = read_sha1_file(ce->sha1, type, &size);
  75        if (!new || strcmp(type, "blob")) {
  76                if (new)
  77                        free(new);
  78                return error("git-checkout-index: unable to read sha1 file of %s (%s)",
  79                        path, sha1_to_hex(ce->sha1));
  80        }
  81        switch (ntohl(ce->ce_mode) & S_IFMT) {
  82        case S_IFREG:
  83                if (to_tempfile) {
  84                        strcpy(path, ".merge_file_XXXXXX");
  85                        fd = mkstemp(path);
  86                } else
  87                        fd = create_file(path, ntohl(ce->ce_mode));
  88                if (fd < 0) {
  89                        free(new);
  90                        return error("git-checkout-index: unable to create file %s (%s)",
  91                                path, strerror(errno));
  92                }
  93                wrote = write(fd, new, size);
  94                close(fd);
  95                free(new);
  96                if (wrote != size)
  97                        return error("git-checkout-index: unable to write file %s", path);
  98                break;
  99        case S_IFLNK:
 100                if (to_tempfile) {
 101                        strcpy(path, ".merge_link_XXXXXX");
 102                        fd = mkstemp(path);
 103                        if (fd < 0) {
 104                                free(new);
 105                                return error("git-checkout-index: unable to create "
 106                                                 "file %s (%s)", path, strerror(errno));
 107                        }
 108                        wrote = write(fd, new, size);
 109                        close(fd);
 110                        free(new);
 111                        if (wrote != size)
 112                                return error("git-checkout-index: unable to write file %s",
 113                                        path);
 114                } else {
 115                        wrote = symlink(new, path);
 116                        free(new);
 117                        if (wrote)
 118                                return error("git-checkout-index: unable to create "
 119                                                 "symlink %s (%s)", path, strerror(errno));
 120                }
 121                break;
 122        default:
 123                free(new);
 124                return error("git-checkout-index: unknown file mode for %s", path);
 125        }
 126
 127        if (state->refresh_cache) {
 128                struct stat st;
 129                lstat(ce->name, &st);
 130                fill_stat_cache_info(ce, &st);
 131        }
 132        return 0;
 133}
 134
 135int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
 136{
 137        static char path[MAXPATHLEN+1];
 138        struct stat st;
 139        int len = state->base_dir_len;
 140
 141        if (topath)
 142                return write_entry(ce, topath, state, 1);
 143
 144        memcpy(path, state->base_dir, len);
 145        strcpy(path + len, ce->name);
 146
 147        if (!lstat(path, &st)) {
 148                unsigned changed = ce_match_stat(ce, &st, 1);
 149                if (!changed)
 150                        return 0;
 151                if (!state->force) {
 152                        if (!state->quiet)
 153                                fprintf(stderr, "git-checkout-index: %s already exists\n", path);
 154                        return -1;
 155                }
 156
 157                /*
 158                 * We unlink the old file, to get the new one with the
 159                 * right permissions (including umask, which is nasty
 160                 * to emulate by hand - much easier to let the system
 161                 * just do the right thing)
 162                 */
 163                unlink(path);
 164                if (S_ISDIR(st.st_mode)) {
 165                        if (!state->force)
 166                                return error("%s is a directory", path);
 167                        remove_subtree(path);
 168                }
 169        } else if (state->not_new)
 170                return 0;
 171        create_directories(path, state);
 172        return write_entry(ce, path, state, 0);
 173}
 174
 175