summaryrefslogtreecommitdiff
path: root/builtin/rerere.c
blob: 3c8e45843e148758fece8b64015754b7d56ec6d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
#include "builtin.h"
#include "cache.h"
#include "dir.h"
#include "string-list.h"
#include "rerere.h"
#include "xdiff/xdiff.h"
#include "xdiff-interface.h"
 
static const char git_rerere_usage[] =
"git rerere [clear | status | diff | gc]";
 
/* these values are days */
static int cutoff_noresolve = 15;
static int cutoff_resolve = 60;
 
static time_t rerere_created_at(const char *name)
{
	struct stat st;
	return stat(rerere_path(name, "preimage"), &st) ? (time_t) 0 : st.st_mtime;
}
 
static void unlink_rr_item(const char *name)
{
	unlink(rerere_path(name, "thisimage"));
	unlink(rerere_path(name, "preimage"));
	unlink(rerere_path(name, "postimage"));
	rmdir(git_path("rr-cache/%s", name));
}
 
static int git_rerere_gc_config(const char *var, const char *value, void *cb)
{
	if (!strcmp(var, "gc.rerereresolved"))
		cutoff_resolve = git_config_int(var, value);
	else if (!strcmp(var, "gc.rerereunresolved"))
		cutoff_noresolve = git_config_int(var, value);
	else
		return git_default_config(var, value, cb);
	return 0;
}
 
static void garbage_collect(struct string_list *rr)
{
	struct string_list to_remove = STRING_LIST_INIT_DUP;
	DIR *dir;
	struct dirent *e;
	int i, cutoff;
	time_t now = time(NULL), then;
 
	git_config(git_rerere_gc_config, NULL);
	dir = opendir(git_path("rr-cache"));
	if (!dir)
		die_errno("unable to open rr-cache directory");
	while ((e = readdir(dir))) {
		if (is_dot_or_dotdot(e->d_name))
			continue;
		then = rerere_created_at(e->d_name);
		if (!then)
			continue;
		cutoff = (has_rerere_resolution(e->d_name)
			  ? cutoff_resolve : cutoff_noresolve);
		if (then < now - cutoff * 86400)
			string_list_append(&to_remove, e->d_name);
	}
	for (i = 0; i < to_remove.nr; i++)
		unlink_rr_item(to_remove.items[i].string);
	string_list_clear(&to_remove, 0);
}
 
static int outf(void *dummy, mmbuffer_t *ptr, int nbuf)
{
	int i;
	for (i = 0; i < nbuf; i++)
		if (write_in_full(1, ptr[i].ptr, ptr[i].size) != ptr[i].size)
			return -1;
	return 0;
}
 
static int diff_two(const char *file1, const char *label1,
		const char *file2, const char *label2)
{
	xpparam_t xpp;
	xdemitconf_t xecfg;
	xdemitcb_t ecb;
	mmfile_t minus, plus;
 
	if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))
		return 1;
 
	printf("--- a/%s\n+++ b/%s\n", label1, label2);
	fflush(stdout);
	memset(&xpp, 0, sizeof(xpp));
	xpp.flags = 0;
	memset(&xecfg, 0, sizeof(xecfg));
	xecfg.ctxlen = 3;
	ecb.outf = outf;
	xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);
 
	free(minus.ptr);
	free(plus.ptr);
	return 0;
}
 
int cmd_rerere(int argc, const char **argv, const char *prefix)
{
	struct string_list merge_rr = STRING_LIST_INIT_DUP;
	int i, fd, flags = 0;
 
	if (2 < argc) {
		if (!strcmp(argv[1], "-h"))
			usage(git_rerere_usage);
		if (!strcmp(argv[1], "--rerere-autoupdate"))
			flags = RERERE_AUTOUPDATE;
		else if (!strcmp(argv[1], "--no-rerere-autoupdate"))
			flags = RERERE_NOAUTOUPDATE;
		if (flags) {
			argc--;
			argv++;
		}
	}
	if (argc < 2)
		return rerere(flags);
 
	if (!strcmp(argv[1], "forget")) {
		const char **pathspec = get_pathspec(prefix, argv + 2);
		return rerere_forget(pathspec);
	}
 
	fd = setup_rerere(&merge_rr, flags);
	if (fd < 0)
		return 0;
 
	if (!strcmp(argv[1], "clear")) {
		for (i = 0; i < merge_rr.nr; i++) {
			const char *name = (const char *)merge_rr.items[i].util;
			if (!has_rerere_resolution(name))
				unlink_rr_item(name);
		}
		unlink_or_warn(git_path("rr-cache/MERGE_RR"));
	} else if (!strcmp(argv[1], "gc"))
		garbage_collect(&merge_rr);
	else if (!strcmp(argv[1], "status"))
		for (i = 0; i < merge_rr.nr; i++)
			printf("%s\n", merge_rr.items[i].string);
	else if (!strcmp(argv[1], "diff"))
		for (i = 0; i < merge_rr.nr; i++) {
			const char *path = merge_rr.items[i].string;
			const char *name = (const char *)merge_rr.items[i].util;
			diff_two(rerere_path(name, "preimage"), path, path, path);
		}
	else
		usage(git_rerere_usage);
 
	string_list_clear(&merge_rr, 1);
	return 0;
}