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85e51b783c
This makes "subtree" more orthogonal to the rest of recursive merge, so that you can use subtree and ours/theirs features at the same time. For example, you can now say: git merge -s subtree -Xtheirs other to merge with "other" branch while shifting it up or down to match the shape of the tree of the current branch, and resolving conflicts favoring the changes "other" branch made over changes made in the current branch. It also allows the prefix used to shift the trees to be specified using the "-Xsubtree=$prefix" option. Giving an empty prefix tells the command to figure out how much to shift trees automatically as we have always done. "merge -s subtree" is the same as "merge -s recursive -Xsubtree=" (or "merge -s recursive -Xsubtree"). Based on an old patch done back in the days when git-merge was a script; Avery ported the script part to builtin-merge.c. Bugs in shift_tree() is mine. Signed-off-by: Avery Pennarun <apenwarr@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
#include "cache.h"
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#include "commit.h"
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#include "tag.h"
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#include "merge-recursive.h"
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static const char *better_branch_name(const char *branch)
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{
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static char githead_env[8 + 40 + 1];
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char *name;
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if (strlen(branch) != 40)
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return branch;
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sprintf(githead_env, "GITHEAD_%s", branch);
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name = getenv(githead_env);
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return name ? name : branch;
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}
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int cmd_merge_recursive(int argc, const char **argv, const char *prefix)
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{
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const unsigned char *bases[21];
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unsigned bases_count = 0;
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int i, failed;
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unsigned char h1[20], h2[20];
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struct merge_options o;
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struct commit *result;
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init_merge_options(&o);
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if (argv[0] && !suffixcmp(argv[0], "-subtree"))
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o.subtree_shift = "";
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if (argc < 4)
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usagef("%s <base>... -- <head> <remote> ...", argv[0]);
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for (i = 1; i < argc; ++i) {
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const char *arg = argv[i];
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if (!prefixcmp(arg, "--")) {
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if (!arg[2])
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break;
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if (!strcmp(arg+2, "ours"))
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o.recursive_variant = MERGE_RECURSIVE_OURS;
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else if (!strcmp(arg+2, "theirs"))
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o.recursive_variant = MERGE_RECURSIVE_THEIRS;
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else if (!strcmp(arg+2, "subtree"))
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o.subtree_shift = "";
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else if (!prefixcmp(arg+2, "subtree="))
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o.subtree_shift = arg + 10;
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else
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die("Unknown option %s", arg);
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continue;
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}
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if (bases_count < ARRAY_SIZE(bases)-1) {
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unsigned char *sha = xmalloc(20);
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if (get_sha1(argv[i], sha))
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die("Could not parse object '%s'", argv[i]);
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bases[bases_count++] = sha;
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}
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else
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warning("Cannot handle more than %d bases. "
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"Ignoring %s.",
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(int)ARRAY_SIZE(bases)-1, argv[i]);
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}
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if (argc - i != 3) /* "--" "<head>" "<remote>" */
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die("Not handling anything other than two heads merge.");
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o.branch1 = argv[++i];
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o.branch2 = argv[++i];
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if (get_sha1(o.branch1, h1))
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die("Could not resolve ref '%s'", o.branch1);
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if (get_sha1(o.branch2, h2))
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die("Could not resolve ref '%s'", o.branch2);
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o.branch1 = better_branch_name(o.branch1);
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o.branch2 = better_branch_name(o.branch2);
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if (o.verbosity >= 3)
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printf("Merging %s with %s\n", o.branch1, o.branch2);
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failed = merge_recursive_generic(&o, h1, h2, bases_count, bases, &result);
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if (failed < 0)
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return 128; /* die() error code */
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return failed;
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}
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