Add corner case tests for diff-index and diff-files
[gitweb.git] / builtin-merge-recursive.c
index 6fe4102c0cfb29031f7fdce68ca4d1937e2fefd7..910c0d20e7ba1128c705a49bfd9966212c5420b2 100644 (file)
 #include "tree-walk.h"
 #include "diff.h"
 #include "diffcore.h"
-#include "run-command.h"
 #include "tag.h"
 #include "unpack-trees.h"
 #include "path-list.h"
 #include "xdiff-interface.h"
+#include "ll-merge.h"
 #include "interpolate.h"
 #include "attr.h"
 #include "merge-recursive.h"
@@ -213,6 +213,8 @@ static int git_merge_trees(int index_only,
        opts.merge = 1;
        opts.head_idx = 2;
        opts.fn = threeway_merge;
+       opts.src_index = &the_index;
+       opts.dst_index = &the_index;
 
        init_tree_desc_from_tree(t+0, common);
        init_tree_desc_from_tree(t+1, head);
@@ -615,364 +617,16 @@ static void fill_mm(const unsigned char *sha1, mmfile_t *mm)
        mm->size = size;
 }
 
-/*
- * Customizable low-level merge drivers support.
- */
-
-struct ll_merge_driver;
-typedef int (*ll_merge_fn)(const struct ll_merge_driver *,
-                          const char *path,
-                          mmfile_t *orig,
-                          mmfile_t *src1, const char *name1,
-                          mmfile_t *src2, const char *name2,
-                          mmbuffer_t *result);
-
-struct ll_merge_driver {
-       const char *name;
-       const char *description;
-       ll_merge_fn fn;
-       const char *recursive;
-       struct ll_merge_driver *next;
-       char *cmdline;
-};
-
-/*
- * Built-in low-levels
- */
-static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
-                          const char *path_unused,
-                          mmfile_t *orig,
-                          mmfile_t *src1, const char *name1,
-                          mmfile_t *src2, const char *name2,
-                          mmbuffer_t *result)
-{
-       /*
-        * The tentative merge result is "ours" for the final round,
-        * or common ancestor for an internal merge.  Still return
-        * "conflicted merge" status.
-        */
-       mmfile_t *stolen = index_only ? orig : src1;
-
-       result->ptr = stolen->ptr;
-       result->size = stolen->size;
-       stolen->ptr = NULL;
-       return 1;
-}
-
-static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
-                       const char *path_unused,
-                       mmfile_t *orig,
-                       mmfile_t *src1, const char *name1,
-                       mmfile_t *src2, const char *name2,
-                       mmbuffer_t *result)
-{
-       xpparam_t xpp;
-
-       if (buffer_is_binary(orig->ptr, orig->size) ||
-           buffer_is_binary(src1->ptr, src1->size) ||
-           buffer_is_binary(src2->ptr, src2->size)) {
-               warning("Cannot merge binary files: %s vs. %s\n",
-                       name1, name2);
-               return ll_binary_merge(drv_unused, path_unused,
-                                      orig, src1, name1,
-                                      src2, name2,
-                                      result);
-       }
-
-       memset(&xpp, 0, sizeof(xpp));
-       return xdl_merge(orig,
-                        src1, name1,
-                        src2, name2,
-                        &xpp, XDL_MERGE_ZEALOUS,
-                        result);
-}
-
-static int ll_union_merge(const struct ll_merge_driver *drv_unused,
-                         const char *path_unused,
-                         mmfile_t *orig,
-                         mmfile_t *src1, const char *name1,
-                         mmfile_t *src2, const char *name2,
-                         mmbuffer_t *result)
-{
-       char *src, *dst;
-       long size;
-       const int marker_size = 7;
-
-       int status = ll_xdl_merge(drv_unused, path_unused,
-                                 orig, src1, NULL, src2, NULL, result);
-       if (status <= 0)
-               return status;
-       size = result->size;
-       src = dst = result->ptr;
-       while (size) {
-               char ch;
-               if ((marker_size < size) &&
-                   (*src == '<' || *src == '=' || *src == '>')) {
-                       int i;
-                       ch = *src;
-                       for (i = 0; i < marker_size; i++)
-                               if (src[i] != ch)
-                                       goto not_a_marker;
-                       if (src[marker_size] != '\n')
-                               goto not_a_marker;
-                       src += marker_size + 1;
-                       size -= marker_size + 1;
-                       continue;
-               }
-       not_a_marker:
-               do {
-                       ch = *src++;
-                       *dst++ = ch;
-                       size--;
-               } while (ch != '\n' && size);
-       }
-       result->size = dst - result->ptr;
-       return 0;
-}
-
-#define LL_BINARY_MERGE 0
-#define LL_TEXT_MERGE 1
-#define LL_UNION_MERGE 2
-static struct ll_merge_driver ll_merge_drv[] = {
-       { "binary", "built-in binary merge", ll_binary_merge },
-       { "text", "built-in 3-way text merge", ll_xdl_merge },
-       { "union", "built-in union merge", ll_union_merge },
-};
-
-static void create_temp(mmfile_t *src, char *path)
-{
-       int fd;
-
-       strcpy(path, ".merge_file_XXXXXX");
-       fd = xmkstemp(path);
-       if (write_in_full(fd, src->ptr, src->size) != src->size)
-               die("unable to write temp-file");
-       close(fd);
-}
-
-/*
- * User defined low-level merge driver support.
- */
-static int ll_ext_merge(const struct ll_merge_driver *fn,
-                       const char *path,
-                       mmfile_t *orig,
-                       mmfile_t *src1, const char *name1,
-                       mmfile_t *src2, const char *name2,
-                       mmbuffer_t *result)
-{
-       char temp[3][50];
-       char cmdbuf[2048];
-       struct interp table[] = {
-               { "%O" },
-               { "%A" },
-               { "%B" },
-       };
-       struct child_process child;
-       const char *args[20];
-       int status, fd, i;
-       struct stat st;
-
-       if (fn->cmdline == NULL)
-               die("custom merge driver %s lacks command line.", fn->name);
-
-       result->ptr = NULL;
-       result->size = 0;
-       create_temp(orig, temp[0]);
-       create_temp(src1, temp[1]);
-       create_temp(src2, temp[2]);
-
-       interp_set_entry(table, 0, temp[0]);
-       interp_set_entry(table, 1, temp[1]);
-       interp_set_entry(table, 2, temp[2]);
-
-       output(1, "merging %s using %s", path,
-              fn->description ? fn->description : fn->name);
-
-       interpolate(cmdbuf, sizeof(cmdbuf), fn->cmdline, table, 3);
-
-       memset(&child, 0, sizeof(child));
-       child.argv = args;
-       args[0] = "sh";
-       args[1] = "-c";
-       args[2] = cmdbuf;
-       args[3] = NULL;
-
-       status = run_command(&child);
-       if (status < -ERR_RUN_COMMAND_FORK)
-               ; /* failure in run-command */
-       else
-               status = -status;
-       fd = open(temp[1], O_RDONLY);
-       if (fd < 0)
-               goto bad;
-       if (fstat(fd, &st))
-               goto close_bad;
-       result->size = st.st_size;
-       result->ptr = xmalloc(result->size + 1);
-       if (read_in_full(fd, result->ptr, result->size) != result->size) {
-               free(result->ptr);
-               result->ptr = NULL;
-               result->size = 0;
-       }
- close_bad:
-       close(fd);
- bad:
-       for (i = 0; i < 3; i++)
-               unlink(temp[i]);
-       return status;
-}
-
-/*
- * merge.default and merge.driver configuration items
- */
-static struct ll_merge_driver *ll_user_merge, **ll_user_merge_tail;
-static const char *default_ll_merge;
-
-static int read_merge_config(const char *var, const char *value)
-{
-       struct ll_merge_driver *fn;
-       const char *ep, *name;
-       int namelen;
-
-       if (!strcmp(var, "merge.default")) {
-               if (!value)
-                       return config_error_nonbool(var);
-               default_ll_merge = strdup(value);
-               return 0;
-       }
-
-       /*
-        * We are not interested in anything but "merge.<name>.variable";
-        * especially, we do not want to look at variables such as
-        * "merge.summary", "merge.tool", and "merge.verbosity".
-        */
-       if (prefixcmp(var, "merge.") || (ep = strrchr(var, '.')) == var + 5)
-               return 0;
-
-       /*
-        * Find existing one as we might be processing merge.<name>.var2
-        * after seeing merge.<name>.var1.
-        */
-       name = var + 6;
-       namelen = ep - name;
-       for (fn = ll_user_merge; fn; fn = fn->next)
-               if (!strncmp(fn->name, name, namelen) && !fn->name[namelen])
-                       break;
-       if (!fn) {
-               fn = xcalloc(1, sizeof(struct ll_merge_driver));
-               fn->name = xmemdupz(name, namelen);
-               fn->fn = ll_ext_merge;
-               *ll_user_merge_tail = fn;
-               ll_user_merge_tail = &(fn->next);
-       }
-
-       ep++;
-
-       if (!strcmp("name", ep)) {
-               if (!value)
-                       return config_error_nonbool(var);
-               fn->description = strdup(value);
-               return 0;
-       }
-
-       if (!strcmp("driver", ep)) {
-               if (!value)
-                       return config_error_nonbool(var);
-               /*
-                * merge.<name>.driver specifies the command line:
-                *
-                *      command-line
-                *
-                * The command-line will be interpolated with the following
-                * tokens and is given to the shell:
-                *
-                *    %O - temporary file name for the merge base.
-                *    %A - temporary file name for our version.
-                *    %B - temporary file name for the other branches' version.
-                *
-                * The external merge driver should write the results in the
-                * file named by %A, and signal that it has done with zero exit
-                * status.
-                */
-               fn->cmdline = strdup(value);
-               return 0;
-       }
-
-       if (!strcmp("recursive", ep)) {
-               if (!value)
-                       return config_error_nonbool(var);
-               fn->recursive = strdup(value);
-               return 0;
-       }
-
-       return 0;
-}
-
-static void initialize_ll_merge(void)
-{
-       if (ll_user_merge_tail)
-               return;
-       ll_user_merge_tail = &ll_user_merge;
-       git_config(read_merge_config);
-}
-
-static const struct ll_merge_driver *find_ll_merge_driver(const char *merge_attr)
-{
-       struct ll_merge_driver *fn;
-       const char *name;
-       int i;
-
-       initialize_ll_merge();
-
-       if (ATTR_TRUE(merge_attr))
-               return &ll_merge_drv[LL_TEXT_MERGE];
-       else if (ATTR_FALSE(merge_attr))
-               return &ll_merge_drv[LL_BINARY_MERGE];
-       else if (ATTR_UNSET(merge_attr)) {
-               if (!default_ll_merge)
-                       return &ll_merge_drv[LL_TEXT_MERGE];
-               else
-                       name = default_ll_merge;
-       }
-       else
-               name = merge_attr;
-
-       for (fn = ll_user_merge; fn; fn = fn->next)
-               if (!strcmp(fn->name, name))
-                       return fn;
-
-       for (i = 0; i < ARRAY_SIZE(ll_merge_drv); i++)
-               if (!strcmp(ll_merge_drv[i].name, name))
-                       return &ll_merge_drv[i];
-
-       /* default to the 3-way */
-       return &ll_merge_drv[LL_TEXT_MERGE];
-}
-
-static const char *git_path_check_merge(const char *path)
-{
-       static struct git_attr_check attr_merge_check;
-
-       if (!attr_merge_check.attr)
-               attr_merge_check.attr = git_attr("merge", 5);
-
-       if (git_checkattr(path, 1, &attr_merge_check))
-               return NULL;
-       return attr_merge_check.value;
-}
-
-static int ll_merge(mmbuffer_t *result_buf,
-                   struct diff_filespec *o,
-                   struct diff_filespec *a,
-                   struct diff_filespec *b,
-                   const char *branch1,
-                   const char *branch2)
+static int merge_3way(mmbuffer_t *result_buf,
+                     struct diff_filespec *o,
+                     struct diff_filespec *a,
+                     struct diff_filespec *b,
+                     const char *branch1,
+                     const char *branch2)
 {
        mmfile_t orig, src1, src2;
        char *name1, *name2;
        int merge_status;
-       const char *ll_driver_name;
-       const struct ll_merge_driver *driver;
 
        name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
        name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
@@ -981,14 +635,9 @@ static int ll_merge(mmbuffer_t *result_buf,
        fill_mm(a->sha1, &src1);
        fill_mm(b->sha1, &src2);
 
-       ll_driver_name = git_path_check_merge(a->path);
-       driver = find_ll_merge_driver(ll_driver_name);
-
-       if (index_only && driver->recursive)
-               driver = find_ll_merge_driver(driver->recursive);
-       merge_status = driver->fn(driver, a->path,
-                                 &orig, &src1, name1, &src2, name2,
-                                 result_buf);
+       merge_status = ll_merge(result_buf, a->path, &orig,
+                               &src1, name1, &src2, name2,
+                               index_only);
 
        free(name1);
        free(name2);
@@ -1019,9 +668,20 @@ static struct merge_file_info merge_file(struct diff_filespec *o,
                if (!sha_eq(a->sha1, o->sha1) && !sha_eq(b->sha1, o->sha1))
                        result.merge = 1;
 
-               result.mode = a->mode == o->mode ? b->mode: a->mode;
+               /*
+                * Merge modes
+                */
+               if (a->mode == b->mode || a->mode == o->mode)
+                       result.mode = b->mode;
+               else {
+                       result.mode = a->mode;
+                       if (b->mode != o->mode) {
+                               result.clean = 0;
+                               result.merge = 1;
+                       }
+               }
 
-               if (sha_eq(a->sha1, o->sha1))
+               if (sha_eq(a->sha1, b->sha1) || sha_eq(a->sha1, o->sha1))
                        hashcpy(result.sha, b->sha1);
                else if (sha_eq(b->sha1, o->sha1))
                        hashcpy(result.sha, a->sha1);
@@ -1029,8 +689,8 @@ static struct merge_file_info merge_file(struct diff_filespec *o,
                        mmbuffer_t result_buf;
                        int merge_status;
 
-                       merge_status = ll_merge(&result_buf, o, a, b,
-                                               branch1, branch2);
+                       merge_status = merge_3way(&result_buf, o, a, b,
+                                                 branch1, branch2);
 
                        if ((merge_status < 0) || !result_buf.ptr)
                                die("Failed to execute internal merge");