Reduce the number of connects when fetching
[gitweb.git] / config.c
index f89a61191591c1242ba8fb3ac5b03330cdb1c06b..0b0c9bd050023e15d3f49623ea036894cb5c521a 100644 (file)
--- a/config.c
+++ b/config.c
@@ -6,12 +6,14 @@
  *
  */
 #include "cache.h"
+#include "exec_cmd.h"
 
 #define MAXNAME (256)
 
 static FILE *config_file;
 static const char *config_file_name;
 static int config_linenr;
+static int config_file_eof;
 static int zlib_compression_seen;
 
 static int get_next_char(void)
@@ -33,7 +35,7 @@ static int get_next_char(void)
                if (c == '\n')
                        config_linenr++;
                if (c == EOF) {
-                       config_file = NULL;
+                       config_file_eof = 1;
                        c = '\n';
                }
        }
@@ -117,7 +119,7 @@ static int get_value(config_fn_t fn, char *name, unsigned int len)
        /* Get the full name */
        for (;;) {
                c = get_next_char();
-               if (c == EOF)
+               if (config_file_eof)
                        break;
                if (!iskeychar(c))
                        break;
@@ -181,7 +183,7 @@ static int get_base_var(char *name)
 
        for (;;) {
                int c = get_next_char();
-               if (c == EOF)
+               if (config_file_eof)
                        return -1;
                if (c == ']')
                        return baselen;
@@ -204,8 +206,7 @@ static int git_parse_file(config_fn_t fn)
        for (;;) {
                int c = get_next_char();
                if (c == '\n') {
-                       /* EOF? */
-                       if (!config_file)
+                       if (config_file_eof)
                                return 0;
                        comment = 0;
                        continue;
@@ -233,17 +234,23 @@ static int git_parse_file(config_fn_t fn)
        die("bad config file line %d in %s", config_linenr, config_file_name);
 }
 
-static unsigned long get_unit_factor(const char *end)
+static int parse_unit_factor(const char *end, unsigned long *val)
 {
        if (!*end)
                return 1;
-       else if (!strcasecmp(end, "k"))
-               return 1024;
-       else if (!strcasecmp(end, "m"))
-               return 1024 * 1024;
-       else if (!strcasecmp(end, "g"))
-               return 1024 * 1024 * 1024;
-       die("unknown unit: '%s'", end);
+       else if (!strcasecmp(end, "k")) {
+               *val *= 1024;
+               return 1;
+       }
+       else if (!strcasecmp(end, "m")) {
+               *val *= 1024 * 1024;
+               return 1;
+       }
+       else if (!strcasecmp(end, "g")) {
+               *val *= 1024 * 1024 * 1024;
+               return 1;
+       }
+       return 0;
 }
 
 int git_parse_long(const char *value, long *ret)
@@ -251,7 +258,10 @@ int git_parse_long(const char *value, long *ret)
        if (value && *value) {
                char *end;
                long val = strtol(value, &end, 0);
-               *ret = val * get_unit_factor(end);
+               unsigned long factor = 1;
+               if (!parse_unit_factor(end, &factor))
+                       return 0;
+               *ret = val * factor;
                return 1;
        }
        return 0;
@@ -262,7 +272,9 @@ int git_parse_ulong(const char *value, unsigned long *ret)
        if (value && *value) {
                char *end;
                unsigned long val = strtoul(value, &end, 0);
-               *ret = val * get_unit_factor(end);
+               if (!parse_unit_factor(end, &val))
+                       return 0;
+               *ret = val;
                return 1;
        }
        return 0;
@@ -426,6 +438,23 @@ int git_default_config(const char *var, const char *value)
                return 0;
        }
 
+       if (!strcmp(var, "core.editor")) {
+               editor_program = xstrdup(value);
+               return 0;
+       }
+
+       if (!strcmp(var, "core.excludesfile")) {
+               if (!value)
+                       die("core.excludesfile without value");
+               excludes_file = xstrdup(value);
+               return 0;
+       }
+
+       if (!strcmp(var, "core.whitespace")) {
+               whitespace_rule_cfg = parse_whitespace_rule(value);
+               return 0;
+       }
+
        /* Add other config variables here and to Documentation/config.txt. */
        return 0;
 }
@@ -440,6 +469,7 @@ int git_config_from_file(config_fn_t fn, const char *filename)
                config_file = f;
                config_file_name = filename;
                config_linenr = 1;
+               config_file_eof = 0;
                ret = git_parse_file(fn);
                fclose(f);
                config_file_name = NULL;
@@ -447,6 +477,22 @@ int git_config_from_file(config_fn_t fn, const char *filename)
        return ret;
 }
 
+const char *git_etc_gitconfig(void)
+{
+       static const char *system_wide;
+       if (!system_wide) {
+               system_wide = ETC_GITCONFIG;
+               if (!is_absolute_path(system_wide)) {
+                       /* interpret path relative to exec-dir */
+                       const char *exec_path = git_exec_path();
+                       system_wide = strdup(prefix_filename(exec_path,
+                                                            strlen(exec_path),
+                                                            system_wide));
+               }
+       }
+       return system_wide;
+}
+
 int git_config(config_fn_t fn)
 {
        int ret = 0;
@@ -459,8 +505,8 @@ int git_config(config_fn_t fn)
         * config file otherwise. */
        filename = getenv(CONFIG_ENVIRONMENT);
        if (!filename) {
-               if (!access(ETC_GITCONFIG, R_OK))
-                       ret += git_config_from_file(fn, ETC_GITCONFIG);
+               if (!access(git_etc_gitconfig(), R_OK))
+                       ret += git_config_from_file(fn, git_etc_gitconfig());
                home = getenv("HOME");
                filename = getenv(CONFIG_LOCAL_ENVIRONMENT);
                if (!filename)
@@ -577,86 +623,77 @@ static int write_error(void)
 
 static int store_write_section(int fd, const char* key)
 {
-       const char *dot = strchr(key, '.');
-       int len1 = store.baselen, len2 = -1;
+       const char *dot;
+       int i, success;
+       struct strbuf sb;
 
-       dot = strchr(key, '.');
+       strbuf_init(&sb, 0);
+       dot = memchr(key, '.', store.baselen);
        if (dot) {
-               int dotlen = dot - key;
-               if (dotlen < len1) {
-                       len2 = len1 - dotlen - 1;
-                       len1 = dotlen;
+               strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
+               for (i = dot - key + 1; i < store.baselen; i++) {
+                       if (key[i] == '"')
+                               strbuf_addch(&sb, '\\');
+                       strbuf_addch(&sb, key[i]);
                }
+               strbuf_addstr(&sb, "\"]\n");
+       } else {
+               strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
        }
 
-       if (write_in_full(fd, "[", 1) != 1 ||
-           write_in_full(fd, key, len1) != len1)
-               return 0;
-       if (len2 >= 0) {
-               if (write_in_full(fd, " \"", 2) != 2)
-                       return 0;
-               while (--len2 >= 0) {
-                       unsigned char c = *++dot;
-                       if (c == '"')
-                               if (write_in_full(fd, "\\", 1) != 1)
-                                       return 0;
-                       if (write_in_full(fd, &c, 1) != 1)
-                               return 0;
-               }
-               if (write_in_full(fd, "\"", 1) != 1)
-                       return 0;
-       }
-       if (write_in_full(fd, "]\n", 2) != 2)
-               return 0;
+       success = write_in_full(fd, sb.buf, sb.len) == sb.len;
+       strbuf_release(&sb);
 
-       return 1;
+       return success;
 }
 
 static int store_write_pair(int fd, const char* key, const char* value)
 {
-       int i;
-       int length = strlen(key+store.baselen+1);
-       int quote = 0;
+       int i, success;
+       int length = strlen(key + store.baselen + 1);
+       const char *quote = "";
+       struct strbuf sb;
 
-       /* Check to see if the value needs to be quoted. */
+       /*
+        * Check to see if the value needs to be surrounded with a dq pair.
+        * Note that problematic characters are always backslash-quoted; this
+        * check is about not losing leading or trailing SP and strings that
+        * follow beginning-of-comment characters (i.e. ';' and '#') by the
+        * configuration parser.
+        */
        if (value[0] == ' ')
-               quote = 1;
+               quote = "\"";
        for (i = 0; value[i]; i++)
                if (value[i] == ';' || value[i] == '#')
-                       quote = 1;
-       if (value[i-1] == ' ')
-               quote = 1;
+                       quote = "\"";
+       if (i && value[i - 1] == ' ')
+               quote = "\"";
+
+       strbuf_init(&sb, 0);
+       strbuf_addf(&sb, "\t%.*s = %s",
+                   length, key + store.baselen + 1, quote);
 
-       if (write_in_full(fd, "\t", 1) != 1 ||
-           write_in_full(fd, key+store.baselen+1, length) != length ||
-           write_in_full(fd, " = ", 3) != 3)
-               return 0;
-       if (quote && write_in_full(fd, "\"", 1) != 1)
-               return 0;
        for (i = 0; value[i]; i++)
                switch (value[i]) {
                case '\n':
-                       if (write_in_full(fd, "\\n", 2) != 2)
-                               return 0;
+                       strbuf_addstr(&sb, "\\n");
                        break;
                case '\t':
-                       if (write_in_full(fd, "\\t", 2) != 2)
-                               return 0;
+                       strbuf_addstr(&sb, "\\t");
                        break;
                case '"':
                case '\\':
-                       if (write_in_full(fd, "\\", 1) != 1)
-                               return 0;
+                       strbuf_addch(&sb, '\\');
                default:
-                       if (write_in_full(fd, value+i, 1) != 1)
-                               return 0;
+                       strbuf_addch(&sb, value[i]);
                        break;
                }
-       if (quote && write_in_full(fd, "\"", 1) != 1)
-               return 0;
-       if (write_in_full(fd, "\n", 1) != 1)
-               return 0;
-       return 1;
+       strbuf_addf(&sb, "%s\n", quote);
+
+       success = write_in_full(fd, sb.buf, sb.len) == sb.len;
+       strbuf_release(&sb);
+
+       return success;
 }
 
 static ssize_t find_beginning_of_line(const char* contents, size_t size,
@@ -715,7 +752,7 @@ int git_config_set_multivar(const char* key, const char* value,
        int fd = -1, in_fd;
        int ret;
        char* config_filename;
-       char* lock_file;
+       struct lock_file *lock = NULL;
        const char* last_dot = strrchr(key, '.');
 
        config_filename = getenv(CONFIG_ENVIRONMENT);
@@ -725,7 +762,6 @@ int git_config_set_multivar(const char* key, const char* value,
                        config_filename  = git_path("config");
        }
        config_filename = xstrdup(config_filename);
-       lock_file = xstrdup(mkpath("%s.lock", config_filename));
 
        /*
         * Since "key" actually contains the section name and the real
@@ -770,11 +806,12 @@ int git_config_set_multivar(const char* key, const char* value,
        store.key[i] = 0;
 
        /*
-        * The lock_file serves a purpose in addition to locking: the new
+        * The lock 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 || adjust_shared_perm(lock_file)) {
+       lock = xcalloc(sizeof(struct lock_file), 1);
+       fd = hold_lock_file_for_update(lock, config_filename, 0);
+       if (fd < 0) {
                fprintf(stderr, "could not lock config file\n");
                free(store.key);
                ret = -1;
@@ -883,6 +920,9 @@ int git_config_set_multivar(const char* key, const char* value,
                                        contents, contents_sz,
                                        store.offset[i]-2, &new_line);
 
+                       if (copy_end > 0 && contents[copy_end-1] != '\n')
+                               new_line = 1;
+
                        /* write the first part of the config */
                        if (copy_end > copy_begin) {
                                if (write_in_full(fd, contents + copy_begin,
@@ -914,25 +954,27 @@ int git_config_set_multivar(const char* key, const char* value,
                                goto write_err_out;
 
                munmap(contents, contents_sz);
-               unlink(config_filename);
        }
 
-       if (rename(lock_file, config_filename) < 0) {
-               fprintf(stderr, "Could not rename the lock file?\n");
+       if (commit_lock_file(lock) < 0) {
+               fprintf(stderr, "Cannot commit config file!\n");
                ret = 4;
                goto out_free;
        }
 
+       /*
+        * lock is committed, so don't try to roll it back below.
+        * NOTE: Since lockfile.c keeps a linked list of all created
+        * lock_file structures, it isn't safe to free(lock).  It's
+        * better to just leave it hanging around.
+        */
+       lock = NULL;
        ret = 0;
 
 out_free:
-       if (0 <= fd)
-               close(fd);
+       if (lock)
+               rollback_lock_file(lock);
        free(config_filename);
-       if (lock_file) {
-               unlink(lock_file);
-               free(lock_file);
-       }
        return ret;
 
 write_err_out:
@@ -1027,7 +1069,7 @@ int git_config_rename_section(const char *old_name, const char *new_name)
        }
        fclose(config_file);
  unlock_and_out:
-       if (close(out_fd) || commit_lock_file(lock) < 0)
+       if (commit_lock_file(lock) < 0)
                        ret = error("Cannot commit config file!");
  out:
        free(config_filename);