git.con commit merge-recur: fix thinko in unique_path() (f59aac4)
   1#include <stdio.h>
   2#include <sys/types.h>
   3#include <sys/stat.h>
   4#include <dirent.h>
   5#include <unistd.h>
   6#include <stdlib.h>
   7#include <string.h>
   8#include <errno.h>
   9#include <limits.h>
  10#include <stdarg.h>
  11#include "git-compat-util.h"
  12#include "exec_cmd.h"
  13#include "cache.h"
  14#include "quote.h"
  15
  16#include "builtin.h"
  17
  18static void prepend_to_path(const char *dir, int len)
  19{
  20        const char *old_path = getenv("PATH");
  21        char *path;
  22        int path_len = len;
  23
  24        if (!old_path)
  25                old_path = "/usr/local/bin:/usr/bin:/bin";
  26
  27        path_len = len + strlen(old_path) + 1;
  28
  29        path = malloc(path_len + 1);
  30
  31        memcpy(path, dir, len);
  32        path[len] = ':';
  33        memcpy(path + len + 1, old_path, path_len - len);
  34
  35        setenv("PATH", path, 1);
  36}
  37
  38static const char *alias_command;
  39static char *alias_string = NULL;
  40
  41static int git_alias_config(const char *var, const char *value)
  42{
  43        if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
  44                alias_string = strdup(value);
  45        }
  46        return 0;
  47}
  48
  49static int split_cmdline(char *cmdline, const char ***argv)
  50{
  51        int src, dst, count = 0, size = 16;
  52        char quoted = 0;
  53
  54        *argv = malloc(sizeof(char*) * size);
  55
  56        /* split alias_string */
  57        (*argv)[count++] = cmdline;
  58        for (src = dst = 0; cmdline[src];) {
  59                char c = cmdline[src];
  60                if (!quoted && isspace(c)) {
  61                        cmdline[dst++] = 0;
  62                        while (cmdline[++src]
  63                                        && isspace(cmdline[src]))
  64                                ; /* skip */
  65                        if (count >= size) {
  66                                size += 16;
  67                                *argv = realloc(*argv, sizeof(char*) * size);
  68                        }
  69                        (*argv)[count++] = cmdline + dst;
  70                } else if(!quoted && (c == '\'' || c == '"')) {
  71                        quoted = c;
  72                        src++;
  73                } else if (c == quoted) {
  74                        quoted = 0;
  75                        src++;
  76                } else {
  77                        if (c == '\\' && quoted != '\'') {
  78                                src++;
  79                                c = cmdline[src];
  80                                if (!c) {
  81                                        free(*argv);
  82                                        *argv = NULL;
  83                                        return error("cmdline ends with \\");
  84                                }
  85                        }
  86                        cmdline[dst++] = c;
  87                        src++;
  88                }
  89        }
  90
  91        cmdline[dst] = 0;
  92
  93        if (quoted) {
  94                free(*argv);
  95                *argv = NULL;
  96                return error("unclosed quote");
  97        }
  98
  99        return count;
 100}
 101
 102static int handle_alias(int *argcp, const char ***argv)
 103{
 104        int nongit = 0, ret = 0, saved_errno = errno;
 105        const char *subdir;
 106
 107        subdir = setup_git_directory_gently(&nongit);
 108        if (!nongit) {
 109                int count;
 110                const char** new_argv;
 111
 112                alias_command = (*argv)[0];
 113                git_config(git_alias_config);
 114                if (alias_string) {
 115
 116                        count = split_cmdline(alias_string, &new_argv);
 117
 118                        if (count < 1)
 119                                die("empty alias for %s", alias_command);
 120
 121                        if (!strcmp(alias_command, new_argv[0]))
 122                                die("recursive alias: %s", alias_command);
 123
 124                        if (getenv("GIT_TRACE")) {
 125                                int i;
 126                                fprintf(stderr, "trace: alias expansion: %s =>",
 127                                        alias_command);
 128                                for (i = 0; i < count; ++i) {
 129                                        fputc(' ', stderr);
 130                                        sq_quote_print(stderr, new_argv[i]);
 131                                }
 132                                fputc('\n', stderr);
 133                                fflush(stderr);
 134                        }
 135
 136                        /* insert after command name */
 137                        if (*argcp > 1) {
 138                                new_argv = realloc(new_argv, sizeof(char*) *
 139                                                   (count + *argcp));
 140                                memcpy(new_argv + count, *argv + 1,
 141                                       sizeof(char*) * *argcp);
 142                        }
 143
 144                        *argv = new_argv;
 145                        *argcp += count - 1;
 146
 147                        ret = 1;
 148                }
 149        }
 150
 151        if (subdir)
 152                chdir(subdir);
 153
 154        errno = saved_errno;
 155
 156        return ret;
 157}
 158
 159const char git_version_string[] = GIT_VERSION;
 160
 161static void handle_internal_command(int argc, const char **argv, char **envp)
 162{
 163        const char *cmd = argv[0];
 164        static struct cmd_struct {
 165                const char *cmd;
 166                int (*fn)(int, const char **, char **);
 167        } commands[] = {
 168                { "version", cmd_version },
 169                { "help", cmd_help },
 170                { "log", cmd_log },
 171                { "whatchanged", cmd_whatchanged },
 172                { "show", cmd_show },
 173                { "push", cmd_push },
 174                { "format-patch", cmd_format_patch },
 175                { "count-objects", cmd_count_objects },
 176                { "diff", cmd_diff },
 177                { "grep", cmd_grep },
 178                { "rm", cmd_rm },
 179                { "add", cmd_add },
 180                { "rev-list", cmd_rev_list },
 181                { "init-db", cmd_init_db },
 182                { "get-tar-commit-id", cmd_get_tar_commit_id },
 183                { "upload-tar", cmd_upload_tar },
 184                { "check-ref-format", cmd_check_ref_format },
 185                { "ls-files", cmd_ls_files },
 186                { "ls-tree", cmd_ls_tree },
 187                { "tar-tree", cmd_tar_tree },
 188                { "read-tree", cmd_read_tree },
 189                { "commit-tree", cmd_commit_tree },
 190                { "apply", cmd_apply },
 191                { "show-branch", cmd_show_branch },
 192                { "diff-files", cmd_diff_files },
 193                { "diff-index", cmd_diff_index },
 194                { "diff-stages", cmd_diff_stages },
 195                { "diff-tree", cmd_diff_tree },
 196                { "cat-file", cmd_cat_file },
 197                { "rev-parse", cmd_rev_parse },
 198                { "write-tree", cmd_write_tree },
 199                { "mailsplit", cmd_mailsplit },
 200                { "mailinfo", cmd_mailinfo },
 201                { "stripspace", cmd_stripspace },
 202                { "update-index", cmd_update_index },
 203                { "update-ref", cmd_update_ref },
 204                { "fmt-merge-msg", cmd_fmt_merge_msg },
 205                { "prune", cmd_prune },
 206        };
 207        int i;
 208
 209        /* Turn "git cmd --help" into "git help cmd" */
 210        if (argc > 1 && !strcmp(argv[1], "--help")) {
 211                argv[1] = argv[0];
 212                argv[0] = cmd = "help";
 213        }
 214
 215        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 216                struct cmd_struct *p = commands+i;
 217                if (strcmp(p->cmd, cmd))
 218                        continue;
 219
 220                if (getenv("GIT_TRACE")) {
 221                        int i;
 222                        fprintf(stderr, "trace: built-in: git");
 223                        for (i = 0; i < argc; ++i) {
 224                                fputc(' ', stderr);
 225                                sq_quote_print(stderr, argv[i]);
 226                        }
 227                        putc('\n', stderr);
 228                        fflush(stderr);
 229                }
 230
 231                exit(p->fn(argc, argv, envp));
 232        }
 233}
 234
 235int main(int argc, const char **argv, char **envp)
 236{
 237        const char *cmd = argv[0];
 238        char *slash = strrchr(cmd, '/');
 239        const char *exec_path = NULL;
 240        int done_alias = 0;
 241
 242        /*
 243         * Take the basename of argv[0] as the command
 244         * name, and the dirname as the default exec_path
 245         * if it's an absolute path and we don't have
 246         * anything better.
 247         */
 248        if (slash) {
 249                *slash++ = 0;
 250                if (*cmd == '/')
 251                        exec_path = cmd;
 252                cmd = slash;
 253        }
 254
 255        /*
 256         * "git-xxxx" is the same as "git xxxx", but we obviously:
 257         *
 258         *  - cannot take flags in between the "git" and the "xxxx".
 259         *  - cannot execute it externally (since it would just do
 260         *    the same thing over again)
 261         *
 262         * So we just directly call the internal command handler, and
 263         * die if that one cannot handle it.
 264         */
 265        if (!strncmp(cmd, "git-", 4)) {
 266                cmd += 4;
 267                argv[0] = cmd;
 268                handle_internal_command(argc, argv, envp);
 269                die("cannot handle %s internally", cmd);
 270        }
 271
 272        /* Default command: "help" */
 273        cmd = "help";
 274
 275        /* Look for flags.. */
 276        while (argc > 1) {
 277                cmd = *++argv;
 278                argc--;
 279
 280                if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
 281                        setup_pager();
 282                        continue;
 283                }
 284
 285                if (strncmp(cmd, "--", 2))
 286                        break;
 287
 288                cmd += 2;
 289
 290                /*
 291                 * For legacy reasons, the "version" and "help"
 292                 * commands can be written with "--" prepended
 293                 * to make them look like flags.
 294                 */
 295                if (!strcmp(cmd, "help"))
 296                        break;
 297                if (!strcmp(cmd, "version"))
 298                        break;
 299
 300                /*
 301                 * Check remaining flags (which by now must be
 302                 * "--exec-path", but maybe we will accept
 303                 * other arguments some day)
 304                 */
 305                if (!strncmp(cmd, "exec-path", 9)) {
 306                        cmd += 9;
 307                        if (*cmd == '=') {
 308                                git_set_exec_path(cmd + 1);
 309                                continue;
 310                        }
 311                        puts(git_exec_path());
 312                        exit(0);
 313                }
 314                cmd_usage(0, NULL, NULL);
 315        }
 316        argv[0] = cmd;
 317
 318        /*
 319         * We search for git commands in the following order:
 320         *  - git_exec_path()
 321         *  - the path of the "git" command if we could find it
 322         *    in $0
 323         *  - the regular PATH.
 324         */
 325        if (exec_path)
 326                prepend_to_path(exec_path, strlen(exec_path));
 327        exec_path = git_exec_path();
 328        prepend_to_path(exec_path, strlen(exec_path));
 329
 330        while (1) {
 331                /* See if it's an internal command */
 332                handle_internal_command(argc, argv, envp);
 333
 334                /* .. then try the external ones */
 335                execv_git_cmd(argv);
 336
 337                /* It could be an alias -- this works around the insanity
 338                 * of overriding "git log" with "git show" by having
 339                 * alias.log = show
 340                 */
 341                if (done_alias || !handle_alias(&argc, &argv))
 342                        break;
 343                done_alias = 1;
 344        }
 345
 346        if (errno == ENOENT)
 347                cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
 348
 349        fprintf(stderr, "Failed to run command '%s': %s\n",
 350                cmd, strerror(errno));
 351
 352        return 1;
 353}