/* * ident.c * * create git identifier lines of the form "name <email> date" * * Copyright (C) 2005 Linus Torvalds */ #include "cache.h" static char git_default_date[50]; static void copy_gecos(const struct passwd *w, char *name, size_t sz) { char *src, *dst; size_t len, nlen; nlen = strlen(w->pw_name); /* Traditionally GECOS field had office phone numbers etc, separated * with commas. Also & stands for capitalized form of the login name. */ for (len = 0, dst = name, src = w->pw_gecos; len < sz; src++) { int ch = *src; if (ch != '&') { *dst++ = ch; if (ch == 0 || ch == ',') break; len++; continue; } if (len + nlen < sz) { /* Sorry, Mr. McDonald... */ *dst++ = toupper(*w->pw_name); memcpy(dst, w->pw_name + 1, nlen - 1); dst += nlen - 1; } } if (len < sz) name[len] = 0; else die("Your parents must have hated you!"); } static void copy_email(const struct passwd *pw) { /* * Make up a fake email address * (name + '@' + hostname [+ '.' + domainname]) */ size_t len = strlen(pw->pw_name); if (len > sizeof(git_default_email)/2) die("Your sysadmin must hate you!"); memcpy(git_default_email, pw->pw_name, len); git_default_email[len++] = '@'; gethostname(git_default_email + len, sizeof(git_default_email) - len); if (!strchr(git_default_email+len, '.')) { struct hostent *he = gethostbyname(git_default_email + len); char *domainname; len = strlen(git_default_email); git_default_email[len++] = '.'; if (he && (domainname = strchr(he->h_name, '.'))) strlcpy(git_default_email + len, domainname + 1, sizeof(git_default_email) - len); else strlcpy(git_default_email + len, "(none)", sizeof(git_default_email) - len); } } static void setup_ident(void) { struct passwd *pw = NULL; /* Get the name ("gecos") */ if (!git_default_name[0]) { pw = getpwuid(getuid()); if (!pw) die("You don't exist. Go away!"); copy_gecos(pw, git_default_name, sizeof(git_default_name)); } if (!git_default_email[0]) { const char *email = getenv("EMAIL"); if (email && email[0]) strlcpy(git_default_email, email, sizeof(git_default_email)); else { if (!pw) pw = getpwuid(getuid()); if (!pw) die("You don't exist. Go away!"); copy_email(pw); } } /* And set the default date */ if (!git_default_date[0]) datestamp(git_default_date, sizeof(git_default_date)); } static int add_raw(char *buf, size_t size, int offset, const char *str) { size_t len = strlen(str); if (offset + len > size) return size; memcpy(buf + offset, str, len); return offset + len; } static int crud(unsigned char c) { return c <= 32 || c == '.' || c == ',' || c == ':' || c == ';' || c == '<' || c == '>' || c == '"' || c == '\''; } /* * Copy over a string to the destination, but avoid special * characters ('\n', '<' and '>') and remove crud at the end */ static int copy(char *buf, size_t size, int offset, const char *src) { size_t i, len; unsigned char c; /* Remove crud from the beginning.. */ while ((c = *src) != 0) { if (!crud(c)) break; src++; } /* Remove crud from the end.. */ len = strlen(src); while (len > 0) { c = src[len-1]; if (!crud(c)) break; --len; } /* * Copy the rest to the buffer, but avoid the special * characters '\n' '<' and '>' that act as delimiters on * an identification line */ for (i = 0; i < len; i++) { c = *src++; switch (c) { case '\n': case '<': case '>': continue; } if (offset >= size) return size; buf[offset++] = c; } return offset; } static const char au_env[] = "GIT_AUTHOR_NAME"; static const char co_env[] = "GIT_COMMITTER_NAME"; static const char *env_hint = "\n" "*** Please tell me who you are.\n" "\n" "Run\n" "\n" " git config --global user.email \"you@example.com\"\n" " git config --global user.name \"Your Name\"\n" "\n" "to set your account\'s default identity.\n" "Omit --global to set the identity only in this repository.\n" "\n"; const char *fmt_ident(const char *name, const char *email, const char *date_str, int flag) { static char buffer[1000]; char date[50]; int i; int error_on_no_name = (flag & IDENT_ERROR_ON_NO_NAME); int warn_on_no_name = (flag & IDENT_WARN_ON_NO_NAME); int name_addr_only = (flag & IDENT_NO_DATE); setup_ident(); if (!name) name = git_default_name; if (!email) email = git_default_email; if (!*name) { struct passwd *pw; if ((warn_on_no_name || error_on_no_name) && name == git_default_name && env_hint) { fprintf(stderr, env_hint, au_env, co_env); env_hint = NULL; /* warn only once, for "git var -l" */ } if (error_on_no_name) die("empty ident %s <%s> not allowed", name, email); pw = getpwuid(getuid()); if (!pw) die("You don't exist. Go away!"); strlcpy(git_default_name, pw->pw_name, sizeof(git_default_name)); name = git_default_name; } strcpy(date, git_default_date); if (!name_addr_only && date_str) parse_date(date_str, date, sizeof(date)); i = copy(buffer, sizeof(buffer), 0, name); i = add_raw(buffer, sizeof(buffer), i, " <"); i = copy(buffer, sizeof(buffer), i, email); if (!name_addr_only) { i = add_raw(buffer, sizeof(buffer), i, "> "); i = copy(buffer, sizeof(buffer), i, date); } else { i = add_raw(buffer, sizeof(buffer), i, ">"); } if (i >= sizeof(buffer)) die("Impossibly long personal identifier"); buffer[i] = 0; return buffer; } const char *fmt_name(const char *name, const char *email) { return fmt_ident(name, email, NULL, IDENT_ERROR_ON_NO_NAME | IDENT_NO_DATE); } const char *git_author_info(int flag) { return fmt_ident(getenv("GIT_AUTHOR_NAME"), getenv("GIT_AUTHOR_EMAIL"), getenv("GIT_AUTHOR_DATE"), flag); } const char *git_committer_info(int flag) { if (getenv("GIT_COMMITTER_NAME") && getenv("GIT_COMMITTER_EMAIL")) user_ident_explicitly_given = 1; return fmt_ident(getenv("GIT_COMMITTER_NAME"), getenv("GIT_COMMITTER_EMAIL"), getenv("GIT_COMMITTER_DATE"), flag); }