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Custom low-level merge driver: change the configuration scheme.
This changes the configuration syntax for defining a low-level merge driver to be: [merge "<<drivername>>"] driver = "<<command line>>" name = "<<driver description>>" which is much nicer to read and is extensible. Credit goes to Martin Waitz and Linus. In addition, when we use an external low-level merge driver, it is reported as an extra output from merge-recursive, using the value of merge.<<drivername>.name variable. The demonstration in t6026 has also been updated. Signed-off-by: Junio C Hamano <junkio@cox.net>
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be89cb239e
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153920da5b
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@ -661,14 +661,31 @@ static void fill_mm(const unsigned char *sha1, mmfile_t *mm)
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mm->size = size;
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}
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/* Low-level merge functions */
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typedef int (*ll_merge_fn)(const char *cmd,
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/*
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* Customizable low-level merge drivers support.
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*/
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struct ll_merge_driver;
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typedef int (*ll_merge_fn)(const struct ll_merge_driver *,
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const char *path,
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mmfile_t *orig,
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mmfile_t *src1, const char *name1,
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mmfile_t *src2, const char *name2,
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mmbuffer_t *result);
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static int ll_xdl_merge(const char *cmd__unused,
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struct ll_merge_driver {
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const char *name;
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const char *description;
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ll_merge_fn fn;
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struct ll_merge_driver *next;
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char *cmdline;
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};
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/*
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* Built-in low-levels
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*/
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static int ll_xdl_merge(const struct ll_merge_driver *drv_unused,
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const char *path_unused,
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mmfile_t *orig,
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mmfile_t *src1, const char *name1,
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mmfile_t *src2, const char *name2,
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@ -684,7 +701,8 @@ static int ll_xdl_merge(const char *cmd__unused,
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result);
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}
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static int ll_union_merge(const char *cmd__unused,
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static int ll_union_merge(const struct ll_merge_driver *drv_unused,
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const char *path_unused,
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mmfile_t *orig,
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mmfile_t *src1, const char *name1,
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mmfile_t *src2, const char *name2,
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@ -694,8 +712,8 @@ static int ll_union_merge(const char *cmd__unused,
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long size;
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const int marker_size = 7;
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int status = ll_xdl_merge(cmd__unused, orig,
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src1, NULL, src2, NULL, result);
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int status = ll_xdl_merge(drv_unused, path_unused,
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orig, src1, NULL, src2, NULL, result);
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if (status <= 0)
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return status;
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size = result->size;
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@ -726,7 +744,8 @@ static int ll_union_merge(const char *cmd__unused,
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return 0;
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}
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static int ll_binary_merge(const char *cmd__unused,
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static int ll_binary_merge(const struct ll_merge_driver *drv_unused,
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const char *path_unused,
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mmfile_t *orig,
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mmfile_t *src1, const char *name1,
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mmfile_t *src2, const char *name2,
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@ -745,14 +764,13 @@ static int ll_binary_merge(const char *cmd__unused,
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return 1;
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}
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static struct {
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const char *name;
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ll_merge_fn fn;
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} ll_merge_fns[] = {
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{ "binary", ll_binary_merge },
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{ "text", ll_xdl_merge },
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{ "union", ll_union_merge },
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{ NULL, NULL },
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#define LL_BINARY_MERGE 0
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#define LL_TEXT_MERGE 1
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#define LL_UNION_MERGE 2
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static struct ll_merge_driver ll_merge_drv[] = {
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{ "binary", "built-in binary merge", ll_binary_merge },
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{ "text", "built-in 3-way text merge", ll_xdl_merge },
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{ "union", "built-in union merge", ll_union_merge },
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};
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static void create_temp(mmfile_t *src, char *path)
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@ -768,7 +786,11 @@ static void create_temp(mmfile_t *src, char *path)
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close(fd);
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}
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static int ll_ext_merge(const char *cmd,
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/*
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* User defined low-level merge driver support.
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*/
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static int ll_ext_merge(const struct ll_merge_driver *fn,
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const char *path,
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mmfile_t *orig,
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mmfile_t *src1, const char *name1,
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mmfile_t *src2, const char *name2,
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@ -796,7 +818,10 @@ static int ll_ext_merge(const char *cmd,
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interp_set_entry(table, 1, temp[1]);
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interp_set_entry(table, 2, temp[2]);
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interpolate(cmdbuf, sizeof(cmdbuf), cmd, table, 3);
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output(1, "merging %s using %s", path,
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fn->description ? fn->description : fn->name);
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interpolate(cmdbuf, sizeof(cmdbuf), fn->cmdline, table, 3);
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memset(&child, 0, sizeof(child));
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child.argv = args;
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@ -833,101 +858,124 @@ static int ll_ext_merge(const char *cmd,
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/*
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* merge.default and merge.driver configuration items
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*/
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static struct user_merge_fn {
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struct user_merge_fn *next;
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const char *name;
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char *cmdline;
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char b_[1];
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} *ll_user_merge_fns, **ll_user_merge_fns_tail;
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static struct ll_merge_driver *ll_user_merge, **ll_user_merge_tail;
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static const char *default_ll_merge;
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static int read_merge_config(const char *var, const char *value)
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{
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struct user_merge_fn *fn;
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int blen, nlen;
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struct ll_merge_driver *fn;
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const char *ep, *name;
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int namelen;
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if (!strcmp(var, "merge.default")) {
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default_ll_merge = strdup(value);
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if (value)
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default_ll_merge = strdup(value);
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return 0;
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}
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if (strcmp(var, "merge.driver"))
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return 0;
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if (!value)
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return error("%s: lacks value", var);
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/*
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* merge.driver is a multi-valued configuration, whose value is
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* of form:
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*
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* name command-line
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*
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* The command-line will be interpolated with the following
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* tokens and is given to the shell:
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*
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* %O - temporary file name for the merge base.
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* %A - temporary file name for our version.
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* %B - temporary file name for the other branches' version.
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*
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* The external merge driver should write the results in the file
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* named by %A, and signal that it has done with exit status 0.
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* We are not interested in anything but "merge.<name>.variable";
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* especially, we do not want to look at variables such as
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* "merge.summary", "merge.tool", and "merge.verbosity".
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*/
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for (nlen = -1, blen = 0; value[blen]; blen++)
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if (nlen < 0 && isspace(value[blen]))
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nlen = blen;
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if (nlen < 0)
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return error("%s '%s': lacks command line", var, value);
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fn = xcalloc(1, sizeof(struct user_merge_fn) + blen + 1);
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memcpy(fn->b_, value, blen + 1);
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fn->name = fn->b_;
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fn->b_[nlen] = 0;
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fn->cmdline = fn->b_ + nlen + 1;
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fn->next = *ll_user_merge_fns_tail;
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*ll_user_merge_fns_tail = fn;
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if (prefixcmp(var, "merge.") || (ep = strrchr(var, '.')) == var + 6)
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return 0;
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/*
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* Find existing one as we might be processing merge.<name>.var2
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* after seeing merge.<name>.var1.
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*/
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name = var + 6;
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namelen = ep - name;
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for (fn = ll_user_merge; fn; fn = fn->next)
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if (!strncmp(fn->name, name, namelen) && !fn->name[namelen])
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break;
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if (!fn) {
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char *namebuf;
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fn = xcalloc(1, sizeof(struct ll_merge_driver));
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namebuf = xmalloc(namelen + 1);
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memcpy(namebuf, name, namelen);
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namebuf[namelen] = 0;
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fn->name = namebuf;
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fn->fn = ll_ext_merge;
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fn->next = *ll_user_merge_tail;
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*ll_user_merge_tail = fn;
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}
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ep++;
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if (!strcmp("name", ep)) {
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if (!value)
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return error("%s: lacks value", var);
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fn->description = strdup(value);
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return 0;
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}
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if (!strcmp("driver", ep)) {
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if (!value)
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return error("%s: lacks value", var);
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/*
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* merge.<name>.driver specifies the command line:
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*
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* command-line
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*
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* The command-line will be interpolated with the following
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* tokens and is given to the shell:
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*
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* %O - temporary file name for the merge base.
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* %A - temporary file name for our version.
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* %B - temporary file name for the other branches' version.
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*
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* The external merge driver should write the results in the
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* file named by %A, and signal that it has done with zero exit
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* status.
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*/
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fn->cmdline = strdup(value);
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return 0;
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}
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return 0;
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}
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static void initialize_ll_merge(void)
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{
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if (ll_user_merge_fns_tail)
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if (ll_user_merge_tail)
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return;
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ll_user_merge_fns_tail = &ll_user_merge_fns;
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ll_user_merge_tail = &ll_user_merge;
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git_config(read_merge_config);
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}
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static ll_merge_fn find_ll_merge_fn(void *merge_attr, const char **cmdline)
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static const struct ll_merge_driver *find_ll_merge_driver(void *merge_attr)
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{
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struct user_merge_fn *fn;
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struct ll_merge_driver *fn;
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const char *name;
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int i;
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initialize_ll_merge();
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if (ATTR_TRUE(merge_attr))
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return ll_xdl_merge;
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return &ll_merge_drv[LL_TEXT_MERGE];
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else if (ATTR_FALSE(merge_attr))
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return ll_binary_merge;
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return &ll_merge_drv[LL_BINARY_MERGE];
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else if (ATTR_UNSET(merge_attr)) {
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if (!default_ll_merge)
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return ll_xdl_merge;
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return &ll_merge_drv[LL_TEXT_MERGE];
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else
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name = default_ll_merge;
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}
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else
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name = merge_attr;
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for (fn = ll_user_merge_fns; fn; fn = fn->next) {
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if (!strcmp(fn->name, name)) {
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*cmdline = fn->cmdline;
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return ll_ext_merge;
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}
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}
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for (fn = ll_user_merge; fn; fn = fn->next)
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if (!strcmp(fn->name, name))
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return fn;
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for (i = 0; ll_merge_fns[i].name; i++)
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if (!strcmp(ll_merge_fns[i].name, name))
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return ll_merge_fns[i].fn;
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for (i = 0; i < ARRAY_SIZE(ll_merge_drv); i++)
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if (!strcmp(ll_merge_drv[i].name, name))
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return &ll_merge_drv[i];
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/* default to the 3-way */
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return ll_xdl_merge;
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return &ll_merge_drv[LL_TEXT_MERGE];
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}
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static void *git_path_check_merge(const char *path)
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char *name1, *name2;
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int merge_status;
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void *merge_attr;
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ll_merge_fn fn;
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const char *driver = NULL;
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const struct ll_merge_driver *driver;
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name1 = xstrdup(mkpath("%s:%s", branch1, a->path));
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name2 = xstrdup(mkpath("%s:%s", branch2, b->path));
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fill_mm(b->sha1, &src2);
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merge_attr = git_path_check_merge(a->path);
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fn = find_ll_merge_fn(merge_attr, &driver);
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driver = find_ll_merge_driver(merge_attr);
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merge_status = fn(driver, &orig,
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&src1, name1, &src2, name2, result_buf);
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merge_status = driver->fn(driver, a->path,
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&orig, &src1, name1, &src2, name2,
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result_buf);
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free(name1);
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free(name2);
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@ -98,7 +98,9 @@ test_expect_success 'custom merge backend' '
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git reset --hard anchor &&
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git config --replace-all \
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merge.driver "custom ./custom-merge %O %A %B 0" &&
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merge.custom.driver "./custom-merge %O %A %B 0" &&
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git config --replace-all \
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merge.custom.name "custom merge driver for testing" &&
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git merge master &&
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git reset --hard anchor &&
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git config --replace-all \
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merge.driver "custom ./custom-merge %O %A %B 1" &&
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merge.custom.driver "./custom-merge %O %A %B 1" &&
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git config --replace-all \
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merge.custom.name "custom merge driver for testing" &&
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if git merge master
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then
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