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authorJunio C Hamano <junkio@cox.net>2007-04-22 00:38:00 (GMT)
committerJunio C Hamano <junkio@cox.net>2007-04-22 00:38:00 (GMT)
commita2d7c6c62080b542007f9787342aa1e57b95f50c (patch)
tree22348e2f38132cd45dcf74cf0c02475d95dbce5b /merge-recursive.c
parentafb5b6a24bd333d298d10acac731f1c127bbb82d (diff)
parent5e635e396020cc08bc21a3e67c20c5294d6d13fd (diff)
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Merge branch 'jc/attr'
* 'jc/attr': (28 commits) lockfile: record the primary process. convert.c: restructure the attribute checking part. Fix bogus linked-list management for user defined merge drivers. Simplify calling of CR/LF conversion routines Document gitattributes(5) Update 'crlf' attribute semantics. Documentation: support manual section (5) - file formats. Simplify code to find recursive merge driver. Counto-fix in merge-recursive Fix funny types used in attribute value representation Allow low-level driver to specify different behaviour during internal merge. Custom low-level merge driver: change the configuration scheme. Allow the default low-level merge driver to be configured. Custom low-level merge driver support. Add a demonstration/test of customized merge. Allow specifying specialized merge-backend per path. merge-recursive: separate out xdl_merge() interface. Allow more than true/false to attributes. Document git-check-attr Change attribute negation marker from '!' to '-'. ...
Diffstat (limited to 'merge-recursive.c')
-rw-r--r--merge-recursive.c403
1 files changed, 382 insertions, 21 deletions
diff --git a/merge-recursive.c b/merge-recursive.c
index 31e66e5..403a4c8 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -15,6 +15,8 @@
#include "unpack-trees.h"
#include "path-list.h"
#include "xdiff-interface.h"
+#include "interpolate.h"
+#include "attr.h"
static int subtree_merge;
@@ -645,6 +647,384 @@ 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_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;
+
+ 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;
+}
+
+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;
+}
+
+#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 = mkstemp(path);
+ if (fd < 0)
+ die("unable to create temp-file");
+ 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)
+ 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) {
+ char *namebuf;
+ fn = xcalloc(1, sizeof(struct ll_merge_driver));
+ namebuf = xmalloc(namelen + 1);
+ memcpy(namebuf, name, namelen);
+ namebuf[namelen] = 0;
+ fn->name = namebuf;
+ fn->fn = ll_ext_merge;
+ fn->next = NULL;
+ *ll_user_merge_tail = fn;
+ ll_user_merge_tail = &(fn->next);
+ }
+
+ ep++;
+
+ if (!strcmp("name", ep)) {
+ if (!value)
+ return error("%s: lacks value", var);
+ fn->description = strdup(value);
+ return 0;
+ }
+
+ if (!strcmp("driver", ep)) {
+ if (!value)
+ return error("%s: lacks value", 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 error("%s: lacks value", 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)
+{
+ 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));
+
+ fill_mm(o->sha1, &orig);
+ 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);
+
+ free(name1);
+ free(name2);
+ free(orig.ptr);
+ free(src1.ptr);
+ free(src2.ptr);
+ return merge_status;
+}
+
static struct merge_file_info merge_file(struct diff_filespec *o,
struct diff_filespec *a, struct diff_filespec *b,
const char *branch1, const char *branch2)
@@ -673,30 +1053,11 @@ static struct merge_file_info merge_file(struct diff_filespec *o,
else if (sha_eq(b->sha1, o->sha1))
hashcpy(result.sha, a->sha1);
else if (S_ISREG(a->mode)) {
- mmfile_t orig, src1, src2;
mmbuffer_t result_buf;
- xpparam_t xpp;
- char *name1, *name2;
int merge_status;
- name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
- name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
-
- fill_mm(o->sha1, &orig);
- fill_mm(a->sha1, &src1);
- fill_mm(b->sha1, &src2);
-
- memset(&xpp, 0, sizeof(xpp));
- merge_status = xdl_merge(&orig,
- &src1, name1,
- &src2, name2,
- &xpp, XDL_MERGE_ZEALOUS,
- &result_buf);
- free(name1);
- free(name2);
- free(orig.ptr);
- free(src1.ptr);
- free(src2.ptr);
+ merge_status = ll_merge(&result_buf, o, a, b,
+ branch1, branch2);
if ((merge_status < 0) || !result_buf.ptr)
die("Failed to execute internal merge");