environment: add GIT_PREFIX to local_repo_env

[~andy/git] / setup.c

diff --git a/setup.c b/setup.c
index 3a1b2fd45580cad7ecd55efa755872efc81075ad..d0e3ecdcd4222a3287cbca9b48f9fa04ca4765a8 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;
@@ -620,6 +621,37 @@ 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 +659,11 @@ 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 +688,16 @@ 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;
 
@@ -726,9 +768,9 @@ const char *setup_git_directory_gently(int *nongit_ok)
 
        prefix = setup_git_directory_gently_1(nongit_ok);
        if (prefix)
-               setenv("GIT_PREFIX", prefix, 1);
+               setenv(GIT_PREFIX_ENVIRONMENT, prefix, 1);
        else
-               setenv("GIT_PREFIX", "", 1);
+               setenv(GIT_PREFIX_ENVIRONMENT, "", 1);
 
        if (startup_info) {
                startup_info->have_repository = !nongit_ok || !*nongit_ok;