Andrew's git / gitweb.git / builtin-mv.c
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builtin-mv.con commit Re-implement 'git remote update' using 'git fetch' (8db3559)
   1/*
   2 * "git mv" builtin command
   3 *
   4 * Copyright (C) 2006 Johannes Schindelin
   5 */
   6#include "cache.h"
   7#include "builtin.h"
   8#include "dir.h"
   9#include "cache-tree.h"
  10#include "string-list.h"
  11#include "parse-options.h"
  12
  13static const char * const builtin_mv_usage[] = {
  14        "git mv [options] <source>... <destination>",
  15        NULL
  16};
  17
  18static const char **copy_pathspec(const char *prefix, const char **pathspec,
  19                                  int count, int base_name)
  20{
  21        int i;
  22        const char **result = xmalloc((count + 1) * sizeof(const char *));
  23        memcpy(result, pathspec, count * sizeof(const char *));
  24        result[count] = NULL;
  25        for (i = 0; i < count; i++) {
  26                int length = strlen(result[i]);
  27                if (length > 0 && is_dir_sep(result[i][length - 1]))
  28                        result[i] = xmemdupz(result[i], length - 1);
  29                if (base_name)
  30                        result[i] = basename((char *)result[i]);
  31        }
  32        return get_pathspec(prefix, result);
  33}
  34
  35static const char *add_slash(const char *path)
  36{
  37        int len = strlen(path);
  38        if (path[len - 1] != '/') {
  39                char *with_slash = xmalloc(len + 2);
  40                memcpy(with_slash, path, len);
  41                with_slash[len++] = '/';
  42                with_slash[len] = 0;
  43                return with_slash;
  44        }
  45        return path;
  46}
  47
  48static struct lock_file lock_file;
  49
  50int cmd_mv(int argc, const char **argv, const char *prefix)
  51{
  52        int i, newfd;
  53        int verbose = 0, show_only = 0, force = 0, ignore_errors = 0;
  54        struct option builtin_mv_options[] = {
  55                OPT__DRY_RUN(&show_only),
  56                OPT_BOOLEAN('f', "force", &force, "force move/rename even if target exists"),
  57                OPT_BOOLEAN('k', NULL, &ignore_errors, "skip move/rename errors"),
  58                OPT_END(),
  59        };
  60        const char **source, **destination, **dest_path;
  61        enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
  62        struct stat st;
  63        struct string_list src_for_dst = {NULL, 0, 0, 0};
  64
  65        git_config(git_default_config, NULL);
  66
  67        newfd = hold_locked_index(&lock_file, 1);
  68        if (read_cache() < 0)
  69                die("index file corrupt");
  70
  71        argc = parse_options(argc, argv, prefix, builtin_mv_options,
  72                             builtin_mv_usage, 0);
  73        if (--argc < 1)
  74                usage_with_options(builtin_mv_usage, builtin_mv_options);
  75
  76        source = copy_pathspec(prefix, argv, argc, 0);
  77        modes = xcalloc(argc, sizeof(enum update_mode));
  78        dest_path = copy_pathspec(prefix, argv + argc, 1, 0);
  79
  80        if (dest_path[0][0] == '\0')
  81                /* special case: "." was normalized to "" */
  82                destination = copy_pathspec(dest_path[0], argv, argc, 1);
  83        else if (!lstat(dest_path[0], &st) &&
  84                        S_ISDIR(st.st_mode)) {
  85                dest_path[0] = add_slash(dest_path[0]);
  86                destination = copy_pathspec(dest_path[0], argv, argc, 1);
  87        } else {
  88                if (argc != 1)
  89                        usage_with_options(builtin_mv_usage, builtin_mv_options);
  90                destination = dest_path;
  91        }
  92
  93        /* Checking */
  94        for (i = 0; i < argc; i++) {
  95                const char *src = source[i], *dst = destination[i];
  96                int length, src_is_dir;
  97                const char *bad = NULL;
  98
  99                if (show_only)
 100                        printf("Checking rename of '%s' to '%s'\n", src, dst);
 101
 102                length = strlen(src);
 103                if (lstat(src, &st) < 0)
 104                        bad = "bad source";
 105                else if (!strncmp(src, dst, length) &&
 106                                (dst[length] == 0 || dst[length] == '/')) {
 107                        bad = "can not move directory into itself";
 108                } else if ((src_is_dir = S_ISDIR(st.st_mode))
 109                                && lstat(dst, &st) == 0)
 110                        bad = "cannot move directory over file";
 111                else if (src_is_dir) {
 112                        const char *src_w_slash = add_slash(src);
 113                        int len_w_slash = length + 1;
 114                        int first, last;
 115
 116                        modes[i] = WORKING_DIRECTORY;
 117
 118                        first = cache_name_pos(src_w_slash, len_w_slash);
 119                        if (first >= 0)
 120                                die ("Huh? %.*s is in index?",
 121                                                len_w_slash, src_w_slash);
 122
 123                        first = -1 - first;
 124                        for (last = first; last < active_nr; last++) {
 125                                const char *path = active_cache[last]->name;
 126                                if (strncmp(path, src_w_slash, len_w_slash))
 127                                        break;
 128                        }
 129                        free((char *)src_w_slash);
 130
 131                        if (last - first < 1)
 132                                bad = "source directory is empty";
 133                        else {
 134                                int j, dst_len;
 135
 136                                if (last - first > 0) {
 137                                        source = xrealloc(source,
 138                                                        (argc + last - first)
 139                                                        * sizeof(char *));
 140                                        destination = xrealloc(destination,
 141                                                        (argc + last - first)
 142                                                        * sizeof(char *));
 143                                        modes = xrealloc(modes,
 144                                                        (argc + last - first)
 145                                                        * sizeof(enum update_mode));
 146                                }
 147
 148                                dst = add_slash(dst);
 149                                dst_len = strlen(dst);
 150
 151                                for (j = 0; j < last - first; j++) {
 152                                        const char *path =
 153                                                active_cache[first + j]->name;
 154                                        source[argc + j] = path;
 155                                        destination[argc + j] =
 156                                                prefix_path(dst, dst_len,
 157                                                        path + length + 1);
 158                                        modes[argc + j] = INDEX;
 159                                }
 160                                argc += last - first;
 161                        }
 162                } else if (cache_name_pos(src, length) < 0)
 163                        bad = "not under version control";
 164                else if (lstat(dst, &st) == 0) {
 165                        bad = "destination exists";
 166                        if (force) {
 167                                /*
 168                                 * only files can overwrite each other:
 169                                 * check both source and destination
 170                                 */
 171                                if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
 172                                        fprintf(stderr, "Warning: %s;"
 173                                                        " will overwrite!\n",
 174                                                        bad);
 175                                        bad = NULL;
 176                                } else
 177                                        bad = "Cannot overwrite";
 178                        }
 179                } else if (string_list_has_string(&src_for_dst, dst))
 180                        bad = "multiple sources for the same target";
 181                else
 182                        string_list_insert(dst, &src_for_dst);
 183
 184                if (bad) {
 185                        if (ignore_errors) {
 186                                if (--argc > 0) {
 187                                        memmove(source + i, source + i + 1,
 188                                                (argc - i) * sizeof(char *));
 189                                        memmove(destination + i,
 190                                                destination + i + 1,
 191                                                (argc - i) * sizeof(char *));
 192                                        i--;
 193                                }
 194                        } else
 195                                die ("%s, source=%s, destination=%s",
 196                                     bad, src, dst);
 197                }
 198        }
 199
 200        for (i = 0; i < argc; i++) {
 201                const char *src = source[i], *dst = destination[i];
 202                enum update_mode mode = modes[i];
 203                int pos;
 204                if (show_only || verbose)
 205                        printf("Renaming %s to %s\n", src, dst);
 206                if (!show_only && mode != INDEX &&
 207                                rename(src, dst) < 0 && !ignore_errors)
 208                        die_errno ("renaming '%s' failed", src);
 209
 210                if (mode == WORKING_DIRECTORY)
 211                        continue;
 212
 213                pos = cache_name_pos(src, strlen(src));
 214                assert(pos >= 0);
 215                if (!show_only)
 216                        rename_cache_entry_at(pos, dst);
 217        }
 218
 219        if (active_cache_changed) {
 220                if (write_cache(newfd, active_cache, active_nr) ||
 221                    commit_locked_index(&lock_file))
 222                        die("Unable to write new index file");
 223        }
 224
 225        return 0;
 226}