-
+/*
+ * GIT - The information manager from hell
+ *
+ * Copyright (C) Linus Torvalds, 2005
+ * Copyright (C) Johannes Schindelin, 2005
+ *
+ */
#include "cache.h"
+#include <regex.h>
#define MAXNAME (256)
}
return ret;
}
+
+/*
+ * Find all the stuff for git_config_set() below.
+ */
+static struct {
+ int baselen;
+ char* key;
+ regex_t* value_regex;
+ off_t offset;
+ enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
+ int seen;
+} store;
+
+static int store_aux(const char* key, const char* value)
+{
+ switch (store.state) {
+ case KEY_SEEN:
+ if (!strcmp(key, store.key) &&
+ (store.value_regex == NULL ||
+ !regexec(store.value_regex, value, 0, NULL, 0))) {
+ if (store.seen == 1) {
+ fprintf(stderr,
+ "Warning: %s has multiple values\n",
+ key);
+ }
+ store.offset = ftell(config_file);
+ store.seen++;
+ }
+ break;
+ case SECTION_SEEN:
+ if (strncmp(key, store.key, store.baselen+1)) {
+ store.state = SECTION_END_SEEN;
+ break;
+ } else
+ store.offset = ftell(config_file);
+ /* fallthru */
+ case SECTION_END_SEEN:
+ case START:
+ if (!strcmp(key, store.key) &&
+ (store.value_regex == NULL ||
+ !regexec(store.value_regex, value, 0, NULL, 0))) {
+ store.offset = ftell(config_file);
+ store.state = KEY_SEEN;
+ store.seen++;
+ } else if(!strncmp(key, store.key, store.baselen))
+ store.state = SECTION_SEEN;
+ }
+ return 0;
+}
+
+static void store_write_section(int fd, const char* key)
+{
+ write(fd, "[", 1);
+ write(fd, key, store.baselen);
+ write(fd, "]\n", 2);
+}
+
+static void store_write_pair(int fd, const char* key, const char* value)
+{
+ int i;
+
+ write(fd, "\t", 1);
+ write(fd, key+store.baselen+1,
+ strlen(key+store.baselen+1));
+ write(fd, " = ", 3);
+ for (i = 0; value[i]; i++)
+ switch (value[i]) {
+ case '\n': write(fd, "\\n", 2); break;
+ case '\t': write(fd, "\\t", 2); break;
+ case '"': case '\\': write(fd, "\\", 1);
+ default: write(fd, value+i, 1);
+ }
+ write(fd, "\n", 1);
+}
+
+int git_config_set(const char* key, const char* value)
+{
+ return git_config_set_multivar(key, value, NULL);
+}
+
+/*
+ * If value==NULL, unset in (remove from) config,
+ * if value_regex!=NULL, disregard key/value pairs where value does not match.
+ *
+ * Returns 0 on success.
+ *
+ * This function does this:
+ *
+ * - it locks the config file by creating ".git/config.lock"
+ *
+ * - it then parses the config using store_aux() as validator to find
+ * the position on the key/value pair to replace. If it is to be unset,
+ * it must be found exactly once.
+ *
+ * - the config file is mmap()ed and the part before the match (if any) is
+ * written to the lock file, then the changed part and the rest.
+ *
+ * - the config file is removed and the lock file rename()d to it.
+ *
+ */
+int git_config_set_multivar(const char* key, const char* value,
+ const char* value_regex)
+{
+ int i;
+ struct stat st;
+ int fd;
+ char* config_file = strdup(git_path("config"));
+ char* lock_file = strdup(git_path("config.lock"));
+
+ /*
+ * Since "key" actually contains the section name and the real
+ * key name separated by a dot, we have to know where the dot is.
+ */
+ for (store.baselen = 0;
+ key[store.baselen] != '.' && key[store.baselen];
+ store.baselen++);
+ if (!key[store.baselen] || !key[store.baselen+1]) {
+ fprintf(stderr, "key does not contain a section: %s\n", key);
+ return 2;
+ }
+
+ /*
+ * Validate the key and while at it, lower case it for matching.
+ */
+ store.key = (char*)malloc(strlen(key)+1);
+ for (i = 0; key[i]; i++)
+ if (i != store.baselen && (!isalnum(key[i]) ||
+ (i == store.baselen+1 && !isalpha(key[i])))) {
+ fprintf(stderr, "invalid key: %s\n", key);
+ free(store.key);
+ return 1;
+ } else
+ store.key[i] = tolower(key[i]);
+
+ /*
+ * The lock_file serves a purpose in addition to locking: the new
+ * contents of .git/config will be written into it.
+ */
+ fd = open(lock_file, O_WRONLY | O_CREAT | O_EXCL, 0666);
+ if (fd < 0) {
+ fprintf(stderr, "could not lock config file\n");
+ free(store.key);
+ return -1;
+ }
+
+ /*
+ * If .git/config does not exist yet, write a minimal version.
+ */
+ if (stat(config_file, &st)) {
+ static const char contents[] =
+ "#\n"
+ "# This is the config file\n"
+ "#\n"
+ "\n";
+
+ free(store.key);
+
+ /* if nothing to unset, error out */
+ if (value == NULL) {
+ close(fd);
+ unlink(lock_file);
+ return 5;
+ }
+
+ store.key = (char*)key;
+
+ write(fd, contents, sizeof(contents)-1);
+ store_write_section(fd, key);
+ store_write_pair(fd, key, value);
+ } else{
+ int in_fd;
+ char* contents;
+ int offset, new_line = 0;
+
+ if (value_regex == NULL)
+ store.value_regex = NULL;
+ else {
+ store.value_regex = (regex_t*)malloc(sizeof(regex_t));
+ if (regcomp(store.value_regex, value_regex,
+ REG_EXTENDED)) {
+ fprintf(stderr, "Invalid pattern: %s",
+ value_regex);
+ free(store.value_regex);
+ return 6;
+ }
+ }
+
+ store.offset = 0;
+ store.state = START;
+ store.seen = 0;
+
+ /*
+ * After this, store.offset will contain the *end* offset
+ * of the last match, or remain at 0 if no match was found.
+ * As a side effect, we make sure to transform only a valid
+ * existing config file.
+ */
+ if (git_config(store_aux)) {
+ fprintf(stderr, "invalid config file\n");
+ free(store.key);
+ if (store.value_regex != NULL) {
+ regfree(store.value_regex);
+ free(store.value_regex);
+ }
+ return 3;
+ }
+
+ free(store.key);
+ if (store.value_regex != NULL) {
+ regfree(store.value_regex);
+ free(store.value_regex);
+ }
+
+ /* if nothing to unset, error out */
+ if (store.seen == 0 && value == NULL) {
+ close(fd);
+ unlink(lock_file);
+ return 5;
+ }
+
+ store.key = (char*)key;
+
+ in_fd = open(config_file, O_RDONLY, 0666);
+ contents = mmap(NULL, st.st_size, PROT_READ,
+ MAP_PRIVATE, in_fd, 0);
+ close(in_fd);
+
+ if (store.offset == 0) {
+ store.offset = offset = st.st_size;
+ } else if (store.state != KEY_SEEN) {
+ offset = store.offset;
+ } else {
+ int equal_offset = st.st_size,
+ bracket_offset = st.st_size;
+
+ if (value == NULL && store.seen > 1) {
+ fprintf(stderr, "Cannot remove multivar (%s has %d values\n", key, store.seen);
+ close(fd);
+ unlink(lock_file);
+ return 7;
+ }
+ for (offset = store.offset-2; offset > 0
+ && contents[offset] != '\n'; offset--)
+ switch (contents[offset]) {
+ case '=': equal_offset = offset; break;
+ case ']': bracket_offset = offset; break;
+ }
+ if (bracket_offset < equal_offset) {
+ new_line = 1;
+ offset = bracket_offset+1;
+ } else
+ offset++;
+ }
+
+ /* write the first part of the config */
+ write(fd, contents, offset);
+ if (new_line)
+ write(fd, "\n", 1);
+
+ /* write the pair (value == NULL means unset) */
+ if (value != NULL) {
+ if (store.state == START)
+ store_write_section(fd, key);
+ store_write_pair(fd, key, value);
+ }
+
+ /* write the rest of the config */
+ if (store.offset < st.st_size)
+ write(fd, contents + store.offset,
+ st.st_size - store.offset);
+
+ munmap(contents, st.st_size);
+ unlink(config_file);
+ }
+
+ close(fd);
+
+ if (rename(lock_file, config_file) < 0) {
+ fprintf(stderr, "Could not rename the lock file?\n");
+ return 4;
+ }
+
+ return 0;
+}
+