checkout-index.con commit Merge branch 'jc/fmt-patch' into next (b9d301b)
   1/*
   2 * Check-out files from the "current cache directory"
   3 *
   4 * Copyright (C) 2005 Linus Torvalds
   5 *
   6 * Careful: order of argument flags does matter. For example,
   7 *
   8 *      git-checkout-index -a -f file.c
   9 *
  10 * Will first check out all files listed in the cache (but not
  11 * overwrite any old ones), and then force-checkout "file.c" a
  12 * second time (ie that one _will_ overwrite any old contents
  13 * with the same filename).
  14 *
  15 * Also, just doing "git-checkout-index" does nothing. You probably
  16 * meant "git-checkout-index -a". And if you want to force it, you
  17 * want "git-checkout-index -f -a".
  18 *
  19 * Intuitiveness is not the goal here. Repeatability is. The
  20 * reason for the "no arguments means no work" thing is that
  21 * from scripts you are supposed to be able to do things like
  22 *
  23 *      find . -name '*.h' -print0 | xargs -0 git-checkout-index -f --
  24 *
  25 * or:
  26 *
  27 *      find . -name '*.h' -print0 | git-checkout-index -f -z --stdin
  28 *
  29 * which will force all existing *.h files to be replaced with
  30 * their cached copies. If an empty command line implied "all",
  31 * then this would force-refresh everything in the cache, which
  32 * was not the point.
  33 *
  34 * Oh, and the "--" is just a good idea when you know the rest
  35 * will be filenames. Just so that you wouldn't have a filename
  36 * of "-a" causing problems (not possible in the above example,
  37 * but get used to it in scripting!).
  38 */
  39#include "cache.h"
  40#include "strbuf.h"
  41#include "quote.h"
  42#include "cache-tree.h"
  43
  44#define CHECKOUT_ALL 4
  45static const char *prefix;
  46static int prefix_length;
  47static int line_termination = '\n';
  48static int checkout_stage; /* default to checkout stage0 */
  49static int to_tempfile;
  50static char topath[4][MAXPATHLEN+1];
  51
  52static struct checkout state = {
  53        .base_dir = "",
  54        .base_dir_len = 0,
  55        .force = 0,
  56        .quiet = 0,
  57        .not_new = 0,
  58        .refresh_cache = 0,
  59};
  60
  61static void write_tempfile_record (const char *name)
  62{
  63        int i;
  64
  65        if (CHECKOUT_ALL == checkout_stage) {
  66                for (i = 1; i < 4; i++) {
  67                        if (i > 1)
  68                                putchar(' ');
  69                        if (topath[i][0])
  70                                fputs(topath[i], stdout);
  71                        else
  72                                putchar('.');
  73                }
  74        } else
  75                fputs(topath[checkout_stage], stdout);
  76
  77        putchar('\t');
  78        write_name_quoted("", 0, name + prefix_length,
  79                line_termination, stdout);
  80        putchar(line_termination);
  81
  82        for (i = 0; i < 4; i++) {
  83                topath[i][0] = 0;
  84        }
  85}
  86
  87static int checkout_file(const char *name)
  88{
  89        int namelen = strlen(name);
  90        int pos = cache_name_pos(name, namelen);
  91        int has_same_name = 0;
  92        int did_checkout = 0;
  93        int errs = 0;
  94
  95        if (pos < 0)
  96                pos = -pos - 1;
  97
  98        while (pos < active_nr) {
  99                struct cache_entry *ce = active_cache[pos];
 100                if (ce_namelen(ce) != namelen ||
 101                    memcmp(ce->name, name, namelen))
 102                        break;
 103                has_same_name = 1;
 104                pos++;
 105                if (ce_stage(ce) != checkout_stage
 106                    && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 107                        continue;
 108                did_checkout = 1;
 109                if (checkout_entry(ce, &state,
 110                    to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 111                        errs++;
 112        }
 113
 114        if (did_checkout) {
 115                if (to_tempfile)
 116                        write_tempfile_record(name);
 117                return errs > 0 ? -1 : 0;
 118        }
 119
 120        if (!state.quiet) {
 121                fprintf(stderr, "git-checkout-index: %s ", name);
 122                if (!has_same_name)
 123                        fprintf(stderr, "is not in the cache");
 124                else if (checkout_stage)
 125                        fprintf(stderr, "does not exist at stage %d",
 126                                checkout_stage);
 127                else
 128                        fprintf(stderr, "is unmerged");
 129                fputc('\n', stderr);
 130        }
 131        return -1;
 132}
 133
 134static int checkout_all(void)
 135{
 136        int i, errs = 0;
 137        struct cache_entry* last_ce = NULL;
 138
 139        for (i = 0; i < active_nr ; i++) {
 140                struct cache_entry *ce = active_cache[i];
 141                if (ce_stage(ce) != checkout_stage
 142                    && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
 143                        continue;
 144                if (prefix && *prefix &&
 145                    (ce_namelen(ce) <= prefix_length ||
 146                     memcmp(prefix, ce->name, prefix_length)))
 147                        continue;
 148                if (last_ce && to_tempfile) {
 149                        if (ce_namelen(last_ce) != ce_namelen(ce)
 150                            || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
 151                                write_tempfile_record(last_ce->name);
 152                }
 153                if (checkout_entry(ce, &state,
 154                    to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
 155                        errs++;
 156                last_ce = ce;
 157        }
 158        if (last_ce && to_tempfile)
 159                write_tempfile_record(last_ce->name);
 160        if (errs)
 161                /* we have already done our error reporting.
 162                 * exit with the same code as die().
 163                 */
 164                exit(128);
 165        return 0;
 166}
 167
 168static const char checkout_cache_usage[] =
 169"git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
 170
 171static struct cache_file cache_file;
 172
 173int main(int argc, char **argv)
 174{
 175        int i;
 176        int newfd = -1;
 177        int all = 0;
 178        int read_from_stdin = 0;
 179
 180        prefix = setup_git_directory();
 181        git_config(git_default_config);
 182        prefix_length = prefix ? strlen(prefix) : 0;
 183
 184        if (read_cache() < 0) {
 185                die("invalid cache");
 186        }
 187
 188        for (i = 1; i < argc; i++) {
 189                const char *arg = argv[i];
 190
 191                if (!strcmp(arg, "--")) {
 192                        i++;
 193                        break;
 194                }
 195                if (!strcmp(arg, "-a") || !strcmp(arg, "--all")) {
 196                        all = 1;
 197                        continue;
 198                }
 199                if (!strcmp(arg, "-f") || !strcmp(arg, "--force")) {
 200                        state.force = 1;
 201                        continue;
 202                }
 203                if (!strcmp(arg, "-q") || !strcmp(arg, "--quiet")) {
 204                        state.quiet = 1;
 205                        continue;
 206                }
 207                if (!strcmp(arg, "-n") || !strcmp(arg, "--no-create")) {
 208                        state.not_new = 1;
 209                        continue;
 210                }
 211                if (!strcmp(arg, "-u") || !strcmp(arg, "--index")) {
 212                        state.refresh_cache = 1;
 213                        if (newfd < 0)
 214                                newfd = hold_index_file_for_update
 215                                        (&cache_file,
 216                                         get_index_file());
 217                        if (newfd < 0)
 218                                die("cannot open index.lock file.");
 219                        continue;
 220                }
 221                if (!strcmp(arg, "-z")) {
 222                        line_termination = 0;
 223                        continue;
 224                }
 225                if (!strcmp(arg, "--stdin")) {
 226                        if (i != argc - 1)
 227                                die("--stdin must be at the end");
 228                        read_from_stdin = 1;
 229                        i++; /* do not consider arg as a file name */
 230                        break;
 231                }
 232                if (!strcmp(arg, "--temp")) {
 233                        to_tempfile = 1;
 234                        continue;
 235                }
 236                if (!strncmp(arg, "--prefix=", 9)) {
 237                        state.base_dir = arg+9;
 238                        state.base_dir_len = strlen(state.base_dir);
 239                        continue;
 240                }
 241                if (!strncmp(arg, "--stage=", 8)) {
 242                        if (!strcmp(arg + 8, "all")) {
 243                                to_tempfile = 1;
 244                                checkout_stage = CHECKOUT_ALL;
 245                        } else {
 246                                int ch = arg[8];
 247                                if ('1' <= ch && ch <= '3')
 248                                        checkout_stage = arg[8] - '0';
 249                                else
 250                                        die("stage should be between 1 and 3 or all");
 251                        }
 252                        continue;
 253                }
 254                if (arg[0] == '-')
 255                        usage(checkout_cache_usage);
 256                break;
 257        }
 258
 259        if (state.base_dir_len || to_tempfile) {
 260                /* when --prefix is specified we do not
 261                 * want to update cache.
 262                 */
 263                if (state.refresh_cache) {
 264                        close(newfd); newfd = -1;
 265                        rollback_index_file(&cache_file);
 266                }
 267                state.refresh_cache = 0;
 268        }
 269
 270        /* Check out named files first */
 271        for ( ; i < argc; i++) {
 272                const char *arg = argv[i];
 273                const char *p;
 274
 275                if (all)
 276                        die("git-checkout-index: don't mix '--all' and explicit filenames");
 277                if (read_from_stdin)
 278                        die("git-checkout-index: don't mix '--stdin' and explicit filenames");
 279                p = prefix_path(prefix, prefix_length, arg);
 280                checkout_file(p);
 281                if (p < arg || p > arg + strlen(arg))
 282                        free((char*)p);
 283        }
 284
 285        if (read_from_stdin) {
 286                struct strbuf buf;
 287                if (all)
 288                        die("git-checkout-index: don't mix '--all' and '--stdin'");
 289                strbuf_init(&buf);
 290                while (1) {
 291                        char *path_name;
 292                        const char *p;
 293
 294                        read_line(&buf, stdin, line_termination);
 295                        if (buf.eof)
 296                                break;
 297                        if (line_termination && buf.buf[0] == '"')
 298                                path_name = unquote_c_style(buf.buf, NULL);
 299                        else
 300                                path_name = buf.buf;
 301                        p = prefix_path(prefix, prefix_length, path_name);
 302                        checkout_file(p);
 303                        if (p < path_name || p > path_name + strlen(path_name))
 304                                free((char *)p);
 305                        if (path_name != buf.buf)
 306                                free(path_name);
 307                }
 308        }
 309
 310        if (all)
 311                checkout_all();
 312
 313        if (0 <= newfd &&
 314            (write_cache(newfd, active_cache, active_nr) ||
 315             commit_index_file(&cache_file)))
 316                die("Unable to write new cachefile");
 317        return 0;
 318}