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https://github.com/git/git
synced 2024-08-25 10:45:59 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
This adds the basic infrastructure to assign attributes to paths, in a way similar to what the exclusion mechanism does based on $GIT_DIR/info/exclude and .gitignore files. An attribute is just a simple string that does not contain any whitespace. They can be specified in $GIT_DIR/info/attributes file, and .gitattributes file in each directory. Each line in these files defines a pattern matching rule. Similar to the exclusion mechanism, a later match overrides an earlier match in the same file, and entries from .gitattributes file in the same directory takes precedence over the ones from parent directories. Lines in $GIT_DIR/info/attributes file are used as the lowest precedence default rules. A line is either a comment (an empty line, or a line that begins with a '#'), or a rule, which is a whitespace separated list of tokens. The first token on the line is a shell glob pattern. The rest are names of attributes, each of which can optionally be prefixed with '!'. Such a line means "if a path matches this glob, this attribute is set (or unset -- if the attribute name is prefixed with '!'). For glob matching, the same "if the pattern does not have a slash in it, the basename of the path is matched with fnmatch(3) against the pattern, otherwise, the path is matched with the pattern with FNM_PATHNAME" rule as the exclusion mechanism is used. This does not define what an attribute means. Tying an attribute to various effects it has on git operation for paths that have it will be specified separately. Signed-off-by: Junio C Hamano <junkio@cox.net>
422 lines
11 KiB
C
422 lines
11 KiB
C
#include "builtin.h"
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#include "exec_cmd.h"
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#include "cache.h"
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#include "quote.h"
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const char git_usage_string[] =
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"git [--version] [--exec-path[=GIT_EXEC_PATH]] [-p|--paginate] [--bare] [--git-dir=GIT_DIR] [--help] COMMAND [ARGS]";
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static void prepend_to_path(const char *dir, int len)
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{
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const char *old_path = getenv("PATH");
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char *path;
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int path_len = len;
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if (!old_path)
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old_path = "/usr/local/bin:/usr/bin:/bin";
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path_len = len + strlen(old_path) + 1;
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path = xmalloc(path_len + 1);
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memcpy(path, dir, len);
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path[len] = ':';
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memcpy(path + len + 1, old_path, path_len - len);
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setenv("PATH", path, 1);
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free(path);
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}
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static int handle_options(const char*** argv, int* argc)
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{
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int handled = 0;
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while (*argc > 0) {
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const char *cmd = (*argv)[0];
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if (cmd[0] != '-')
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break;
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/*
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* For legacy reasons, the "version" and "help"
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* commands can be written with "--" prepended
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* to make them look like flags.
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*/
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if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
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break;
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/*
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* Check remaining flags.
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*/
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if (!prefixcmp(cmd, "--exec-path")) {
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cmd += 11;
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if (*cmd == '=')
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git_set_exec_path(cmd + 1);
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else {
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puts(git_exec_path());
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exit(0);
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}
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} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
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setup_pager();
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} else if (!strcmp(cmd, "--git-dir")) {
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if (*argc < 2) {
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fprintf(stderr, "No directory given for --git-dir.\n" );
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usage(git_usage_string);
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}
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setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
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(*argv)++;
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(*argc)--;
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handled++;
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} else if (!prefixcmp(cmd, "--git-dir=")) {
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setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
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} else if (!strcmp(cmd, "--bare")) {
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static char git_dir[PATH_MAX+1];
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setenv(GIT_DIR_ENVIRONMENT, getcwd(git_dir, sizeof(git_dir)), 1);
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} else {
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fprintf(stderr, "Unknown option: %s\n", cmd);
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usage(git_usage_string);
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}
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(*argv)++;
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(*argc)--;
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handled++;
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}
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return handled;
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}
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static const char *alias_command;
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static char *alias_string;
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static int git_alias_config(const char *var, const char *value)
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{
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if (!prefixcmp(var, "alias.") && !strcmp(var + 6, alias_command)) {
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alias_string = xstrdup(value);
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}
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return 0;
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}
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static int split_cmdline(char *cmdline, const char ***argv)
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{
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int src, dst, count = 0, size = 16;
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char quoted = 0;
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*argv = xmalloc(sizeof(char*) * size);
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/* split alias_string */
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(*argv)[count++] = cmdline;
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for (src = dst = 0; cmdline[src];) {
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char c = cmdline[src];
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if (!quoted && isspace(c)) {
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cmdline[dst++] = 0;
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while (cmdline[++src]
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&& isspace(cmdline[src]))
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; /* skip */
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if (count >= size) {
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size += 16;
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*argv = xrealloc(*argv, sizeof(char*) * size);
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}
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(*argv)[count++] = cmdline + dst;
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} else if(!quoted && (c == '\'' || c == '"')) {
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quoted = c;
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src++;
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} else if (c == quoted) {
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quoted = 0;
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src++;
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} else {
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if (c == '\\' && quoted != '\'') {
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src++;
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c = cmdline[src];
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if (!c) {
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free(*argv);
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*argv = NULL;
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return error("cmdline ends with \\");
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}
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}
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cmdline[dst++] = c;
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src++;
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}
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}
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cmdline[dst] = 0;
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if (quoted) {
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free(*argv);
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*argv = NULL;
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return error("unclosed quote");
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}
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return count;
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}
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static int handle_alias(int *argcp, const char ***argv)
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{
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int nongit = 0, ret = 0, saved_errno = errno;
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const char *subdir;
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int count, option_count;
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const char** new_argv;
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subdir = setup_git_directory_gently(&nongit);
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alias_command = (*argv)[0];
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git_config(git_alias_config);
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if (alias_string) {
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if (alias_string[0] == '!') {
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trace_printf("trace: alias to shell cmd: %s => %s\n",
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alias_command, alias_string + 1);
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ret = system(alias_string + 1);
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if (ret >= 0 && WIFEXITED(ret) &&
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WEXITSTATUS(ret) != 127)
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exit(WEXITSTATUS(ret));
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die("Failed to run '%s' when expanding alias '%s'\n",
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alias_string + 1, alias_command);
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}
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count = split_cmdline(alias_string, &new_argv);
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option_count = handle_options(&new_argv, &count);
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memmove(new_argv - option_count, new_argv,
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count * sizeof(char *));
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new_argv -= option_count;
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if (count < 1)
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die("empty alias for %s", alias_command);
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if (!strcmp(alias_command, new_argv[0]))
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die("recursive alias: %s", alias_command);
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trace_argv_printf(new_argv, count,
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"trace: alias expansion: %s =>",
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alias_command);
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new_argv = xrealloc(new_argv, sizeof(char*) *
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(count + *argcp + 1));
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/* insert after command name */
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memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
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new_argv[count+*argcp] = NULL;
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*argv = new_argv;
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*argcp += count - 1;
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ret = 1;
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}
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if (subdir)
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chdir(subdir);
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errno = saved_errno;
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return ret;
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}
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const char git_version_string[] = GIT_VERSION;
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#define RUN_SETUP (1<<0)
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#define USE_PAGER (1<<1)
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/*
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* require working tree to be present -- anything uses this needs
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* RUN_SETUP for reading from the configuration file.
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*/
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#define NOT_BARE (1<<2)
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static void handle_internal_command(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0];
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static struct cmd_struct {
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const char *cmd;
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int (*fn)(int, const char **, const char *);
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int option;
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} commands[] = {
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{ "add", cmd_add, RUN_SETUP | NOT_BARE },
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{ "annotate", cmd_annotate, USE_PAGER },
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{ "apply", cmd_apply },
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{ "archive", cmd_archive },
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{ "blame", cmd_blame, RUN_SETUP },
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{ "branch", cmd_branch, RUN_SETUP },
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{ "bundle", cmd_bundle },
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{ "cat-file", cmd_cat_file, RUN_SETUP },
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{ "checkout-index", cmd_checkout_index, RUN_SETUP },
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{ "check-ref-format", cmd_check_ref_format },
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{ "check-attr", cmd_check_attr, RUN_SETUP | NOT_BARE },
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{ "cherry", cmd_cherry, RUN_SETUP },
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{ "cherry-pick", cmd_cherry_pick, RUN_SETUP | NOT_BARE },
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{ "commit-tree", cmd_commit_tree, RUN_SETUP },
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{ "config", cmd_config },
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{ "count-objects", cmd_count_objects, RUN_SETUP },
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{ "describe", cmd_describe, RUN_SETUP },
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{ "diff", cmd_diff, USE_PAGER },
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{ "diff-files", cmd_diff_files },
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{ "diff-index", cmd_diff_index, RUN_SETUP },
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{ "diff-tree", cmd_diff_tree, RUN_SETUP },
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{ "fetch--tool", cmd_fetch__tool, RUN_SETUP },
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{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
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{ "for-each-ref", cmd_for_each_ref, RUN_SETUP },
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{ "format-patch", cmd_format_patch, RUN_SETUP },
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{ "fsck", cmd_fsck, RUN_SETUP },
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{ "fsck-objects", cmd_fsck, RUN_SETUP },
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{ "gc", cmd_gc, RUN_SETUP },
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{ "get-tar-commit-id", cmd_get_tar_commit_id },
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{ "grep", cmd_grep, RUN_SETUP | USE_PAGER },
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{ "help", cmd_help },
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{ "init", cmd_init_db },
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{ "init-db", cmd_init_db },
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{ "log", cmd_log, RUN_SETUP | USE_PAGER },
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{ "ls-files", cmd_ls_files, RUN_SETUP },
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{ "ls-tree", cmd_ls_tree, RUN_SETUP },
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{ "mailinfo", cmd_mailinfo },
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{ "mailsplit", cmd_mailsplit },
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{ "merge-base", cmd_merge_base, RUN_SETUP },
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{ "merge-file", cmd_merge_file },
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{ "mv", cmd_mv, RUN_SETUP | NOT_BARE },
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{ "name-rev", cmd_name_rev, RUN_SETUP },
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{ "pack-objects", cmd_pack_objects, RUN_SETUP },
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{ "pickaxe", cmd_blame, RUN_SETUP | USE_PAGER },
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{ "prune", cmd_prune, RUN_SETUP },
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{ "prune-packed", cmd_prune_packed, RUN_SETUP },
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{ "push", cmd_push, RUN_SETUP },
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{ "read-tree", cmd_read_tree, RUN_SETUP },
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{ "reflog", cmd_reflog, RUN_SETUP },
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{ "repo-config", cmd_config },
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{ "rerere", cmd_rerere, RUN_SETUP },
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{ "rev-list", cmd_rev_list, RUN_SETUP },
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{ "rev-parse", cmd_rev_parse, RUN_SETUP },
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{ "revert", cmd_revert, RUN_SETUP | NOT_BARE },
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{ "rm", cmd_rm, RUN_SETUP | NOT_BARE },
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{ "runstatus", cmd_runstatus, RUN_SETUP | NOT_BARE },
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{ "shortlog", cmd_shortlog, RUN_SETUP | USE_PAGER },
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{ "show-branch", cmd_show_branch, RUN_SETUP },
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{ "show", cmd_show, RUN_SETUP | USE_PAGER },
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{ "stripspace", cmd_stripspace },
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{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
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{ "tar-tree", cmd_tar_tree },
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{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
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{ "update-index", cmd_update_index, RUN_SETUP },
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{ "update-ref", cmd_update_ref, RUN_SETUP },
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{ "upload-archive", cmd_upload_archive },
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{ "version", cmd_version },
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{ "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
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{ "write-tree", cmd_write_tree, RUN_SETUP },
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{ "verify-pack", cmd_verify_pack },
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{ "show-ref", cmd_show_ref, RUN_SETUP },
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{ "pack-refs", cmd_pack_refs, RUN_SETUP },
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};
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int i;
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/* Turn "git cmd --help" into "git help cmd" */
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if (argc > 1 && !strcmp(argv[1], "--help")) {
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argv[1] = argv[0];
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argv[0] = cmd = "help";
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}
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for (i = 0; i < ARRAY_SIZE(commands); i++) {
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struct cmd_struct *p = commands+i;
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const char *prefix;
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if (strcmp(p->cmd, cmd))
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continue;
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prefix = NULL;
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if (p->option & RUN_SETUP)
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prefix = setup_git_directory();
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if (p->option & USE_PAGER)
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setup_pager();
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if ((p->option & NOT_BARE) &&
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(is_bare_repository() || is_inside_git_dir()))
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die("%s must be run in a work tree", cmd);
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trace_argv_printf(argv, argc, "trace: built-in: git");
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exit(p->fn(argc, argv, prefix));
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}
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}
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int main(int argc, const char **argv, char **envp)
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{
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const char *cmd = argv[0] ? argv[0] : "git-help";
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char *slash = strrchr(cmd, '/');
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const char *exec_path = NULL;
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int done_alias = 0;
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/*
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* Take the basename of argv[0] as the command
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* name, and the dirname as the default exec_path
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* if it's an absolute path and we don't have
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* anything better.
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*/
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if (slash) {
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*slash++ = 0;
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if (*cmd == '/')
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exec_path = cmd;
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cmd = slash;
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}
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/*
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* "git-xxxx" is the same as "git xxxx", but we obviously:
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*
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* - cannot take flags in between the "git" and the "xxxx".
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* - cannot execute it externally (since it would just do
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* the same thing over again)
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*
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* So we just directly call the internal command handler, and
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* die if that one cannot handle it.
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*/
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if (!prefixcmp(cmd, "git-")) {
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cmd += 4;
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argv[0] = cmd;
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handle_internal_command(argc, argv, envp);
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die("cannot handle %s internally", cmd);
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}
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/* Look for flags.. */
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argv++;
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argc--;
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handle_options(&argv, &argc);
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if (argc > 0) {
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if (!prefixcmp(argv[0], "--"))
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argv[0] += 2;
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} else {
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/* Default command: "help" */
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argv[0] = "help";
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argc = 1;
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}
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cmd = argv[0];
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/*
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* We search for git commands in the following order:
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* - git_exec_path()
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* - the path of the "git" command if we could find it
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* in $0
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* - the regular PATH.
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*/
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if (exec_path)
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prepend_to_path(exec_path, strlen(exec_path));
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exec_path = git_exec_path();
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prepend_to_path(exec_path, strlen(exec_path));
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while (1) {
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/* See if it's an internal command */
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handle_internal_command(argc, argv, envp);
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/* .. then try the external ones */
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execv_git_cmd(argv);
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/* It could be an alias -- this works around the insanity
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* of overriding "git log" with "git show" by having
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* alias.log = show
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*/
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if (done_alias || !handle_alias(&argc, &argv))
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break;
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done_alias = 1;
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}
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if (errno == ENOENT) {
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if (done_alias) {
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fprintf(stderr, "Expansion of alias '%s' failed; "
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"'%s' is not a git-command\n",
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cmd, argv[0]);
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exit(1);
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}
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help_unknown_cmd(cmd);
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}
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fprintf(stderr, "Failed to run command '%s': %s\n",
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cmd, strerror(errno));
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return 1;
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}
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