Get rid of the dependency on RCS' merge program

diff --git a/setup.c b/setup.c
index 3286a568ed4c7d4c82bb18d779f05518fe05c9b3..2afdba414a073705440f887593a1b5daa1023758 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -47,6 +47,64 @@ const char *prefix_path(const char *prefix, int len, const char *path)
        return path;
 }
 
+/* 
+ * Unlike prefix_path, this should be used if the named file does
+ * not have to interact with index entry; i.e. name of a random file
+ * on the filesystem.
+ */
+const char *prefix_filename(const char *pfx, int pfx_len, const char *arg)
+{
+       static char path[PATH_MAX];
+       if (!pfx || !*pfx || arg[0] == '/')
+               return arg;
+       memcpy(path, pfx, pfx_len);
+       strcpy(path + pfx_len, arg);
+       return path;
+}
+
+/*
+ * Verify a filename that we got as an argument for a pathspec
+ * entry. Note that a filename that begins with "-" never verifies
+ * as true, because even if such a filename were to exist, we want
+ * it to be preceded by the "--" marker (or we want the user to
+ * use a format like "./-filename")
+ */
+void verify_filename(const char *prefix, const char *arg)
+{
+       const char *name;
+       struct stat st;
+
+       if (*arg == '-')
+               die("bad flag '%s' used after filename", arg);
+       name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
+       if (!lstat(name, &st))
+               return;
+       if (errno == ENOENT)
+               die("ambiguous argument '%s': unknown revision or path not in the working tree.\n"
+                   "Use '--' to separate paths from revisions", arg);
+       die("'%s': %s", arg, strerror(errno));
+}
+
+/*
+ * Opposite of the above: the command line did not have -- marker
+ * and we parsed the arg as a refname.  It should not be interpretable
+ * as a filename.
+ */
+void verify_non_filename(const char *prefix, const char *arg)
+{
+       const char *name;
+       struct stat st;
+
+       if (*arg == '-')
+               return; /* flag */
+       name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
+       if (!lstat(name, &st))
+               die("ambiguous argument '%s': both revision and filename\n"
+                   "Use '--' to separate filenames from revisions", arg);
+       if (errno != ENOENT)
+               die("'%s': %s", arg, strerror(errno));
+}
+
 const char **get_pathspec(const char *prefix, const char **pathspec)
 {
        const char *entry = *pathspec;
@@ -92,7 +150,7 @@ static int is_toplevel_directory(void)
        return 1;
 }
 
-static const char *setup_git_directory_1(void)
+const char *setup_git_directory_gently(int *nongit_ok)
 {
        static char cwd[PATH_MAX+1];
        int len, offset;
@@ -126,6 +184,10 @@ static const char *setup_git_directory_1(void)
                }
                return NULL;
        bad_dir_environ:
+               if (nongit_ok) {
+                       *nongit_ok = 1;
+                       return NULL;
+               }
                path[len] = 0;
                die("Not a git repository: '%s'", path);
        }
@@ -139,8 +201,15 @@ static const char *setup_git_directory_1(void)
                        break;
                chdir("..");
                do {
-                       if (!offset)
+                       if (!offset) {
+                               if (nongit_ok) {
+                                       if (chdir(cwd))
+                                               die("Cannot come back to cwd");
+                                       *nongit_ok = 1;
+                                       return NULL;
+                               }
                                die("Not a git repository");
+                       }
                } while (cwd[--offset] != '/');
        }
 
@@ -154,10 +223,27 @@ static const char *setup_git_directory_1(void)
        return cwd + offset;
 }
 
+int git_config_perm(const char *var, const char *value)
+{
+       if (value) {
+               if (!strcmp(value, "umask"))
+                       return PERM_UMASK;
+               if (!strcmp(value, "group"))
+                       return PERM_GROUP;
+               if (!strcmp(value, "all") ||
+                   !strcmp(value, "world") ||
+                   !strcmp(value, "everybody"))
+                       return PERM_EVERYBODY;
+       }
+       return git_config_bool(var, value);
+}
+
 int check_repository_format_version(const char *var, const char *value)
 {
        if (strcmp(var, "core.repositoryformatversion") == 0)
                repository_format_version = git_config_int(var, value);
+       else if (strcmp(var, "core.sharedrepository") == 0)
+               shared_repository = git_config_perm(var, value);
        return 0;
 }
 
@@ -172,7 +258,7 @@ int check_repository_format(void)
 
 const char *setup_git_directory(void)
 {
-       const char *retval = setup_git_directory_1();
+       const char *retval = setup_git_directory_gently(NULL);
        check_repository_format();
        return retval;
 }