git.con commit Merge branch 'lt/fix-sol-pack' (4c61b7d)
   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 <sys/ioctl.h>
  12#include "git-compat-util.h"
  13#include "exec_cmd.h"
  14#include "common-cmds.h"
  15
  16#include "cache.h"
  17#include "commit.h"
  18#include "revision.h"
  19
  20#ifndef PATH_MAX
  21# define PATH_MAX 4096
  22#endif
  23
  24static const char git_usage[] =
  25        "Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
  26
  27/* most gui terms set COLUMNS (although some don't export it) */
  28static int term_columns(void)
  29{
  30        char *col_string = getenv("COLUMNS");
  31        int n_cols = 0;
  32
  33        if (col_string && (n_cols = atoi(col_string)) > 0)
  34                return n_cols;
  35
  36#ifdef TIOCGWINSZ
  37        {
  38                struct winsize ws;
  39                if (!ioctl(1, TIOCGWINSZ, &ws)) {
  40                        if (ws.ws_col)
  41                                return ws.ws_col;
  42                }
  43        }
  44#endif
  45
  46        return 80;
  47}
  48
  49static void oom(void)
  50{
  51        fprintf(stderr, "git: out of memory\n");
  52        exit(1);
  53}
  54
  55static inline void mput_char(char c, unsigned int num)
  56{
  57        while(num--)
  58                putchar(c);
  59}
  60
  61static struct cmdname {
  62        size_t len;
  63        char name[1];
  64} **cmdname;
  65static int cmdname_alloc, cmdname_cnt;
  66
  67static void add_cmdname(const char *name, int len)
  68{
  69        struct cmdname *ent;
  70        if (cmdname_alloc <= cmdname_cnt) {
  71                cmdname_alloc = cmdname_alloc + 200;
  72                cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
  73                if (!cmdname)
  74                        oom();
  75        }
  76        ent = malloc(sizeof(*ent) + len);
  77        if (!ent)
  78                oom();
  79        ent->len = len;
  80        memcpy(ent->name, name, len);
  81        ent->name[len] = 0;
  82        cmdname[cmdname_cnt++] = ent;
  83}
  84
  85static int cmdname_compare(const void *a_, const void *b_)
  86{
  87        struct cmdname *a = *(struct cmdname **)a_;
  88        struct cmdname *b = *(struct cmdname **)b_;
  89        return strcmp(a->name, b->name);
  90}
  91
  92static void pretty_print_string_list(struct cmdname **cmdname, int longest)
  93{
  94        int cols = 1, rows;
  95        int space = longest + 1; /* min 1 SP between words */
  96        int max_cols = term_columns() - 1; /* don't print *on* the edge */
  97        int i, j;
  98
  99        if (space < max_cols)
 100                cols = max_cols / space;
 101        rows = (cmdname_cnt + cols - 1) / cols;
 102
 103        qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
 104
 105        for (i = 0; i < rows; i++) {
 106                printf("  ");
 107
 108                for (j = 0; j < cols; j++) {
 109                        int n = j * rows + i;
 110                        int size = space;
 111                        if (n >= cmdname_cnt)
 112                                break;
 113                        if (j == cols-1 || n + rows >= cmdname_cnt)
 114                                size = 1;
 115                        printf("%-*s", size, cmdname[n]->name);
 116                }
 117                putchar('\n');
 118        }
 119}
 120
 121static void list_commands(const char *exec_path, const char *pattern)
 122{
 123        unsigned int longest = 0;
 124        char path[PATH_MAX];
 125        int dirlen;
 126        DIR *dir = opendir(exec_path);
 127        struct dirent *de;
 128
 129        if (!dir) {
 130                fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
 131                exit(1);
 132        }
 133
 134        dirlen = strlen(exec_path);
 135        if (PATH_MAX - 20 < dirlen) {
 136                fprintf(stderr, "git: insanely long exec-path '%s'\n",
 137                        exec_path);
 138                exit(1);
 139        }
 140
 141        memcpy(path, exec_path, dirlen);
 142        path[dirlen++] = '/';
 143
 144        while ((de = readdir(dir)) != NULL) {
 145                struct stat st;
 146                int entlen;
 147
 148                if (strncmp(de->d_name, "git-", 4))
 149                        continue;
 150                strcpy(path+dirlen, de->d_name);
 151                if (stat(path, &st) || /* stat, not lstat */
 152                    !S_ISREG(st.st_mode) ||
 153                    !(st.st_mode & S_IXUSR))
 154                        continue;
 155
 156                entlen = strlen(de->d_name);
 157                if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
 158                        entlen -= 4;
 159
 160                if (longest < entlen)
 161                        longest = entlen;
 162
 163                add_cmdname(de->d_name + 4, entlen-4);
 164        }
 165        closedir(dir);
 166
 167        printf("git commands available in '%s'\n", exec_path);
 168        printf("----------------------------");
 169        mput_char('-', strlen(exec_path));
 170        putchar('\n');
 171        pretty_print_string_list(cmdname, longest - 4);
 172        putchar('\n');
 173}
 174
 175static void list_common_cmds_help(void)
 176{
 177        int i, longest = 0;
 178
 179        for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
 180                if (longest < strlen(common_cmds[i].name))
 181                        longest = strlen(common_cmds[i].name);
 182        }
 183
 184        puts("The most commonly used git commands are:");
 185        for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
 186                printf("    %s", common_cmds[i].name);
 187                mput_char(' ', longest - strlen(common_cmds[i].name) + 4);
 188                puts(common_cmds[i].help);
 189        }
 190        puts("(use 'git help -a' to get a list of all installed git commands)");
 191}
 192
 193#ifdef __GNUC__
 194static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
 195        __attribute__((__format__(__printf__, 3, 4), __noreturn__));
 196#endif
 197static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
 198{
 199        if (fmt) {
 200                va_list ap;
 201
 202                va_start(ap, fmt);
 203                printf("git: ");
 204                vprintf(fmt, ap);
 205                va_end(ap);
 206                putchar('\n');
 207        }
 208        else
 209                puts(git_usage);
 210
 211        if (exec_path) {
 212                putchar('\n');
 213                if (show_all)
 214                        list_commands(exec_path, "git-*");
 215                else
 216                        list_common_cmds_help();
 217        }
 218
 219        exit(1);
 220}
 221
 222static void prepend_to_path(const char *dir, int len)
 223{
 224        char *path, *old_path = getenv("PATH");
 225        int path_len = len;
 226
 227        if (!old_path)
 228                old_path = "/usr/local/bin:/usr/bin:/bin";
 229
 230        path_len = len + strlen(old_path) + 1;
 231
 232        path = malloc(path_len + 1);
 233
 234        memcpy(path, dir, len);
 235        path[len] = ':';
 236        memcpy(path + len + 1, old_path, path_len - len);
 237
 238        setenv("PATH", path, 1);
 239}
 240
 241static void show_man_page(const char *git_cmd)
 242{
 243        const char *page;
 244
 245        if (!strncmp(git_cmd, "git", 3))
 246                page = git_cmd;
 247        else {
 248                int page_len = strlen(git_cmd) + 4;
 249                char *p = malloc(page_len + 1);
 250                strcpy(p, "git-");
 251                strcpy(p + 4, git_cmd);
 252                p[page_len] = 0;
 253                page = p;
 254        }
 255
 256        execlp("man", "man", page, NULL);
 257}
 258
 259static int cmd_version(int argc, const char **argv, char **envp)
 260{
 261        printf("git version %s\n", GIT_VERSION);
 262        return 0;
 263}
 264
 265static int cmd_help(int argc, const char **argv, char **envp)
 266{
 267        const char *help_cmd = argv[1];
 268        if (!help_cmd)
 269                cmd_usage(0, git_exec_path(), NULL);
 270        else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
 271                cmd_usage(1, git_exec_path(), NULL);
 272        else
 273                show_man_page(help_cmd);
 274        return 0;
 275}
 276
 277#define LOGSIZE (65536)
 278
 279static int cmd_log(int argc, const char **argv, char **envp)
 280{
 281        struct rev_info rev;
 282        struct commit *commit;
 283        char *buf = xmalloc(LOGSIZE);
 284        static enum cmit_fmt commit_format = CMIT_FMT_DEFAULT;
 285        int abbrev = DEFAULT_ABBREV;
 286        const char *commit_prefix = "commit ";
 287
 288        argc = setup_revisions(argc, argv, &rev, "HEAD");
 289        while (1 < argc) {
 290                const char *arg = argv[1];
 291                if (!strncmp(arg, "--pretty", 8)) {
 292                        commit_format = get_commit_format(arg + 8);
 293                        if (commit_format == CMIT_FMT_ONELINE)
 294                                commit_prefix = "";
 295                }
 296                else if (!strcmp(arg, "--no-abbrev")) {
 297                        abbrev = 0;
 298                }
 299                else if (!strncmp(arg, "--abbrev=", 9)) {
 300                        abbrev = strtoul(arg + 9, NULL, 10);
 301                        if (abbrev && abbrev < MINIMUM_ABBREV)
 302                                abbrev = MINIMUM_ABBREV;
 303                        else if (40 < abbrev)
 304                                abbrev = 40;
 305                }
 306                else
 307                        die("unrecognized argument: %s", arg);
 308                argc--; argv++;
 309        }
 310
 311        prepare_revision_walk(&rev);
 312        setup_pager();
 313        while ((commit = get_revision(&rev)) != NULL) {
 314                printf("%s%s", commit_prefix,
 315                       sha1_to_hex(commit->object.sha1));
 316                if (rev.parents) {
 317                        struct commit_list *parents = commit->parents;
 318                        while (parents) {
 319                                struct object *o = &(parents->item->object);
 320                                parents = parents->next;
 321                                if (o->flags & TMP_MARK)
 322                                        continue;
 323                                printf(" %s", sha1_to_hex(o->sha1));
 324                                o->flags |= TMP_MARK;
 325                        }
 326                        /* TMP_MARK is a general purpose flag that can
 327                         * be used locally, but the user should clean
 328                         * things up after it is done with them.
 329                         */
 330                        for (parents = commit->parents;
 331                             parents;
 332                             parents = parents->next)
 333                                parents->item->object.flags &= ~TMP_MARK;
 334                }
 335                if (commit_format == CMIT_FMT_ONELINE)
 336                        putchar(' ');
 337                else
 338                        putchar('\n');
 339                pretty_print_commit(commit_format, commit, ~0, buf,
 340                                    LOGSIZE, abbrev);
 341                printf("%s\n", buf);
 342        }
 343        free(buf);
 344        return 0;
 345}
 346
 347static void handle_internal_command(int argc, const char **argv, char **envp)
 348{
 349        const char *cmd = argv[0];
 350        static struct cmd_struct {
 351                const char *cmd;
 352                int (*fn)(int, const char **, char **);
 353        } commands[] = {
 354                { "version", cmd_version },
 355                { "help", cmd_help },
 356                { "log", cmd_log },
 357        };
 358        int i;
 359
 360        for (i = 0; i < ARRAY_SIZE(commands); i++) {
 361                struct cmd_struct *p = commands+i;
 362                if (strcmp(p->cmd, cmd))
 363                        continue;
 364                exit(p->fn(argc, argv, envp));
 365        }
 366}
 367
 368int main(int argc, const char **argv, char **envp)
 369{
 370        const char *cmd = argv[0];
 371        char *slash = strrchr(cmd, '/');
 372        char git_command[PATH_MAX + 1];
 373        const char *exec_path = NULL;
 374
 375        /*
 376         * Take the basename of argv[0] as the command
 377         * name, and the dirname as the default exec_path
 378         * if it's an absolute path and we don't have
 379         * anything better.
 380         */
 381        if (slash) {
 382                *slash++ = 0;
 383                if (*cmd == '/')
 384                        exec_path = cmd;
 385                cmd = slash;
 386        }
 387
 388        /*
 389         * "git-xxxx" is the same as "git xxxx", but we obviously:
 390         *
 391         *  - cannot take flags in between the "git" and the "xxxx".
 392         *  - cannot execute it externally (since it would just do
 393         *    the same thing over again)
 394         *
 395         * So we just directly call the internal command handler, and
 396         * die if that one cannot handle it.
 397         */
 398        if (!strncmp(cmd, "git-", 4)) {
 399                cmd += 4;
 400                argv[0] = cmd;
 401                handle_internal_command(argc, argv, envp);
 402                die("cannot handle %s internally", cmd);
 403        }
 404
 405        /* Default command: "help" */
 406        cmd = "help";
 407
 408        /* Look for flags.. */
 409        while (argc > 1) {
 410                cmd = *++argv;
 411                argc--;
 412
 413                if (strncmp(cmd, "--", 2))
 414                        break;
 415
 416                cmd += 2;
 417
 418                /*
 419                 * For legacy reasons, the "version" and "help"
 420                 * commands can be written with "--" prepended
 421                 * to make them look like flags.
 422                 */
 423                if (!strcmp(cmd, "help"))
 424                        break;
 425                if (!strcmp(cmd, "version"))
 426                        break;
 427
 428                /*
 429                 * Check remaining flags (which by now must be
 430                 * "--exec-path", but maybe we will accept
 431                 * other arguments some day)
 432                 */
 433                if (!strncmp(cmd, "exec-path", 9)) {
 434                        cmd += 9;
 435                        if (*cmd == '=') {
 436                                git_set_exec_path(cmd + 1);
 437                                continue;
 438                        }
 439                        puts(git_exec_path());
 440                        exit(0);
 441                }
 442                cmd_usage(0, NULL, NULL);
 443        }
 444        argv[0] = cmd;
 445
 446        /*
 447         * We search for git commands in the following order:
 448         *  - git_exec_path()
 449         *  - the path of the "git" command if we could find it
 450         *    in $0
 451         *  - the regular PATH.
 452         */
 453        if (exec_path)
 454                prepend_to_path(exec_path, strlen(exec_path));
 455        exec_path = git_exec_path();
 456        prepend_to_path(exec_path, strlen(exec_path));
 457
 458        /* See if it's an internal command */
 459        handle_internal_command(argc, argv, envp);
 460
 461        /* .. then try the external ones */
 462        execv_git_cmd(argv);
 463
 464        if (errno == ENOENT)
 465                cmd_usage(0, exec_path, "'%s' is not a git-command", cmd);
 466
 467        fprintf(stderr, "Failed to run command '%s': %s\n",
 468                git_command, strerror(errno));
 469
 470        return 1;
 471}