daemon: move daemonize() to libgit.a

diff --git a/setup.c b/setup.c
index d1ece5d16b122858de9521b77e6d60c51ef0cd45..713043ad508dd0083e359547ed477fc9ee5e8406 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -5,7 +5,19 @@
 static int inside_git_dir = -1;
 static int inside_work_tree = -1;
 
-static char *prefix_path_gently(const char *prefix, int len, const char *path)
+/*
+ * Normalize "path", prepending the "prefix" for relative paths. If
+ * remaining_prefix is not NULL, return the actual prefix still
+ * remains in the path. For example, prefix = sub1/sub2/ and path is
+ *
+ *  foo          -> sub1/sub2/foo  (full prefix)
+ *  ../foo       -> sub1/foo       (remaining prefix is sub1/)
+ *  ../../bar    -> bar            (no remaining prefix)
+ *  ../../sub1/sub2/foo -> sub1/sub2/foo (but no remaining prefix)
+ *  `pwd`/../bar -> sub1/bar       (no remaining prefix)
+ */
+char *prefix_path_gently(const char *prefix, int len,
+                        int *remaining_prefix, const char *path)
 {
        const char *orig = path;
        char *sanitized;
@@ -13,13 +25,17 @@ static char *prefix_path_gently(const char *prefix, int len, const char *path)
                const char *temp = real_path(path);
                sanitized = xmalloc(len + strlen(temp) + 1);
                strcpy(sanitized, temp);
+               if (remaining_prefix)
+                       *remaining_prefix = 0;
        } else {
                sanitized = xmalloc(len + strlen(path) + 1);
                if (len)
                        memcpy(sanitized, prefix, len);
                strcpy(sanitized + len, path);
+               if (remaining_prefix)
+                       *remaining_prefix = len;
        }
-       if (normalize_path_copy(sanitized, sanitized))
+       if (normalize_path_copy_len(sanitized, sanitized, remaining_prefix))
                goto error_out;
        if (is_absolute_path(orig)) {
                size_t root_len, len, total;
@@ -44,7 +60,7 @@ static char *prefix_path_gently(const char *prefix, int len, const char *path)
 
 char *prefix_path(const char *prefix, int len, const char *path)
 {
-       char *r = prefix_path_gently(prefix, len, path);
+       char *r = prefix_path_gently(prefix, len, NULL, path);
        if (!r)
                die("'%s' is outside repository", path);
        return r;
@@ -53,7 +69,7 @@ char *prefix_path(const char *prefix, int len, const char *path)
 int path_inside_repo(const char *prefix, const char *path)
 {
        int len = prefix ? strlen(prefix) : 0;
-       char *r = prefix_path_gently(prefix, len, path);
+       char *r = prefix_path_gently(prefix, len, NULL, path);
        if (r) {
                free(r);
                return 1;
@@ -66,7 +82,7 @@ int check_filename(const char *prefix, const char *arg)
        const char *name;
        struct stat st;
 
-       if (!prefixcmp(arg, ":/")) {
+       if (starts_with(arg, ":/")) {
                if (arg[2] == '\0') /* ":/" is root dir, always exists */
                        return 1;
                name = arg + 2;
@@ -230,7 +246,7 @@ void setup_work_tree(void)
        if (getenv(GIT_WORK_TREE_ENVIRONMENT))
                setenv(GIT_WORK_TREE_ENVIRONMENT, ".", 1);
 
-       set_git_dir(relative_path(git_dir, work_tree));
+       set_git_dir(remove_leading_path(git_dir, work_tree));
        initialized = 1;
 }
 
@@ -288,7 +304,7 @@ const char *read_gitfile(const char *path)
        if (len != st.st_size)
                die("Error reading %s", path);
        buf[len] = '\0';
-       if (prefixcmp(buf, "gitdir: "))
+       if (!starts_with(buf, "gitdir: "))
                die("Invalid gitfile format: %s", path);
        while (buf[len - 1] == '\n' || buf[len - 1] == '\r')
                len--;
@@ -547,7 +563,7 @@ static const char *setup_git_directory_gently_1(int *nongit_ok)
 {
        const char *env_ceiling_dirs = getenv(CEILING_DIRECTORIES_ENVIRONMENT);
        struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
-       static char cwd[PATH_MAX+1];
+       static char cwd[PATH_MAX + 1];
        const char *gitdirenv, *ret;
        char *gitfile;
        int len, offset, offset_parent, ceil_offset = -1;
@@ -562,7 +578,7 @@ static const char *setup_git_directory_gently_1(int *nongit_ok)
        if (nongit_ok)
                *nongit_ok = 0;
 
-       if (!getcwd(cwd, sizeof(cwd)-1))
+       if (!getcwd(cwd, sizeof(cwd) - 1))
                die_errno("Unable to read current working directory");
        offset = len = strlen(cwd);
 
@@ -759,3 +775,39 @@ const char *resolve_gitdir(const char *suspect)
                return suspect;
        return read_gitfile(suspect);
 }
+
+/* if any standard file descriptor is missing open it to /dev/null */
+void sanitize_stdfds(void)
+{
+       int fd = open("/dev/null", O_RDWR, 0);
+       while (fd != -1 && fd < 2)
+               fd = dup(fd);
+       if (fd == -1)
+               die_errno("open /dev/null or dup failed");
+       if (fd > 2)
+               close(fd);
+}
+
+int daemonize(void)
+{
+#ifdef NO_POSIX_GOODIES
+       errno = ENOSYS;
+       return -1;
+#else
+       switch (fork()) {
+               case 0:
+                       break;
+               case -1:
+                       die_errno("fork failed");
+               default:
+                       exit(0);
+       }
+       if (setsid() == -1)
+               die_errno("setsid failed");
+       close(0);
+       close(1);
+       close(2);
+       sanitize_stdfds();
+       return 0;
+#endif
+}