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18b26b18c5
"git merge-tree" used to mishandle "both sides added" conflict with its own "create a fake ancestor file that has the common parts of what both sides have added and do a 3-way merge" logic; this has been updated to use the usual "3-way merge with an empty blob as the fake common ancestor file" approach used in the rest of the system. * jk/no-diff-emit-common: xdiff: drop XDL_EMIT_COMMON merge-tree: drop generate_common strategy merge-one-file: use empty blob for add/add base
93 lines
1.9 KiB
C
93 lines
1.9 KiB
C
#include "cache.h"
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#include "run-command.h"
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#include "xdiff-interface.h"
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#include "ll-merge.h"
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#include "blob.h"
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#include "merge-blobs.h"
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static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
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{
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void *buf;
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unsigned long size;
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enum object_type type;
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buf = read_sha1_file(obj->object.oid.hash, &type, &size);
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if (!buf)
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return -1;
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if (type != OBJ_BLOB) {
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free(buf);
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return -1;
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}
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f->ptr = buf;
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f->size = size;
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return 0;
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}
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static void free_mmfile(mmfile_t *f)
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{
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free(f->ptr);
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}
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static void *three_way_filemerge(const char *path, mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size)
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{
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int merge_status;
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mmbuffer_t res;
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/*
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* This function is only used by cmd_merge_tree, which
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* does not respect the merge.conflictstyle option.
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* There is no need to worry about a label for the
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* common ancestor.
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*/
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merge_status = ll_merge(&res, path, base, NULL,
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our, ".our", their, ".their", NULL);
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if (merge_status < 0)
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return NULL;
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*size = res.size;
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return res.ptr;
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}
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void *merge_blobs(const char *path, struct blob *base, struct blob *our, struct blob *their, unsigned long *size)
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{
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void *res = NULL;
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mmfile_t f1, f2, common;
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/*
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* Removed in either branch?
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*
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* NOTE! This depends on the caller having done the
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* proper warning about removing a file that got
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* modified in the other branch!
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*/
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if (!our || !their) {
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enum object_type type;
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if (base)
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return NULL;
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if (!our)
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our = their;
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return read_sha1_file(our->object.oid.hash, &type, size);
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}
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if (fill_mmfile_blob(&f1, our) < 0)
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goto out_no_mmfile;
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if (fill_mmfile_blob(&f2, their) < 0)
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goto out_free_f1;
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if (base) {
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if (fill_mmfile_blob(&common, base) < 0)
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goto out_free_f2_f1;
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} else {
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common.ptr = xstrdup("");
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common.size = 0;
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}
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res = three_way_filemerge(path, &common, &f1, &f2, size);
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free_mmfile(&common);
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out_free_f2_f1:
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free_mmfile(&f2);
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out_free_f1:
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free_mmfile(&f1);
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out_no_mmfile:
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return res;
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}
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