add: make pathless 'add [-u|-A]' warning a file-global function

diff --git a/setup.c b/setup.c
index 3a1b2fd45580cad7ecd55efa755872efc81075ad..1dee47e0850369c87408c540ce2b2251db17be3d 100644 (file)
--- a/setup.c
+++ b/setup.c
@@ -1,5 +1,6 @@
 #include "cache.h"
 #include "dir.h"
+#include "string-list.h"
 
 static int inside_git_dir = -1;
 static int inside_work_tree = -1;
@@ -65,7 +66,14 @@ int check_filename(const char *prefix, const char *arg)
        const char *name;
        struct stat st;
 
-       name = prefix ? prefix_filename(prefix, strlen(prefix), arg) : arg;
+       if (!prefixcmp(arg, ":/")) {
+               if (arg[2] == '\0') /* ":/" is root dir, always exists */
+                       return 1;
+               name = arg + 2;
+       } else if (prefix)
+               name = prefix_filename(prefix, strlen(prefix), arg);
+       else
+               name = arg;
        if (!lstat(name, &st))
                return 1; /* file exists */
        if (errno == ENOENT || errno == ENOTDIR)
@@ -245,6 +253,25 @@ static const char *prefix_pathspec(const char *prefix, int prefixlen, const char
                return prefix_path(prefix, prefixlen, copyfrom);
 }
 
+/*
+ * N.B. get_pathspec() is deprecated in favor of the "struct pathspec"
+ * based interface - see pathspec_magic above.
+ *
+ * Arguments:
+ *  - prefix - a path relative to the root of the working tree
+ *  - pathspec - a list of paths underneath the prefix path
+ *
+ * Iterates over pathspec, prepending each path with prefix,
+ * and return the resulting list.
+ *
+ * If pathspec is empty, return a singleton list containing prefix.
+ *
+ * If pathspec and prefix are both empty, return an empty list.
+ *
+ * This is typically used by built-in commands such as add.c, in order
+ * to normalize argv arguments provided to the built-in into a list of
+ * paths to process, all relative to the root of the working tree.
+ */
 const char **get_pathspec(const char *prefix, const char **pathspec)
 {
        const char *entry = *pathspec;
@@ -620,6 +647,37 @@ static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_
        return buf.st_dev;
 }
 
+/*
+ * A "string_list_each_func_t" function that canonicalizes an entry
+ * from GIT_CEILING_DIRECTORIES using real_path_if_valid(), or
+ * discards it if unusable.  The presence of an empty entry in
+ * GIT_CEILING_DIRECTORIES turns off canonicalization for all
+ * subsequent entries.
+ */
+static int canonicalize_ceiling_entry(struct string_list_item *item,
+                                     void *cb_data)
+{
+       int *empty_entry_found = cb_data;
+       char *ceil = item->string;
+
+       if (!*ceil) {
+               *empty_entry_found = 1;
+               return 0;
+       } else if (!is_absolute_path(ceil)) {
+               return 0;
+       } else if (*empty_entry_found) {
+               /* Keep entry but do not canonicalize it */
+               return 1;
+       } else {
+               const char *real_path = real_path_if_valid(ceil);
+               if (!real_path)
+                       return 0;
+               free(item->string);
+               item->string = xstrdup(real_path);
+               return 1;
+       }
+}
+
 /*
  * We cannot decide in this function whether we are in the work tree or
  * not, since the config can only be read _after_ this function was called.
@@ -627,10 +685,11 @@ static dev_t get_device_or_die(const char *path, const char *prefix, int prefix_
 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];
        const char *gitdirenv, *ret;
        char *gitfile;
-       int len, offset, offset_parent, ceil_offset;
+       int len, offset, offset_parent, ceil_offset = -1;
        dev_t current_device = 0;
        int one_filesystem = 1;
 
@@ -655,7 +714,16 @@ static const char *setup_git_directory_gently_1(int *nongit_ok)
        if (gitdirenv)
                return setup_explicit_git_dir(gitdirenv, cwd, len, nongit_ok);
 
-       ceil_offset = longest_ancestor_length(cwd, env_ceiling_dirs);
+       if (env_ceiling_dirs) {
+               int empty_entry_found = 0;
+
+               string_list_split(&ceiling_dirs, env_ceiling_dirs, PATH_SEP, -1);
+               filter_string_list(&ceiling_dirs, 0,
+                                  canonicalize_ceiling_entry, &empty_entry_found);
+               ceil_offset = longest_ancestor_length(cwd, &ceiling_dirs);
+               string_list_clear(&ceiling_dirs, 0);
+       }
+
        if (ceil_offset < 0 && has_dos_drive_prefix(cwd))
                ceil_offset = 1;