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fast-export.c
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1222 lines (1078 loc) · 31.9 KB
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/*
* "git fast-export" builtin command
*
* Copyright (C) 2007 Johannes E. Schindelin
*/
#include "builtin.h"
#include "cache.h"
#include "config.h"
#include "refs.h"
#include "refspec.h"
#include "object-store.h"
#include "commit.h"
#include "object.h"
#include "tag.h"
#include "diff.h"
#include "diffcore.h"
#include "log-tree.h"
#include "revision.h"
#include "decorate.h"
#include "string-list.h"
#include "utf8.h"
#include "parse-options.h"
#include "quote.h"
#include "remote.h"
#include "blob.h"
#include "commit-slab.h"
static const char *fast_export_usage[] = {
N_("git fast-export [rev-list-opts]"),
NULL
};
static int progress;
static enum { SIGNED_TAG_ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = SIGNED_TAG_ABORT;
static enum { TAG_FILTERING_ABORT, DROP, REWRITE } tag_of_filtered_mode = TAG_FILTERING_ABORT;
static enum { REENCODE_ABORT, REENCODE_YES, REENCODE_NO } reencode_mode = REENCODE_ABORT;
static int fake_missing_tagger;
static int use_done_feature;
static int no_data;
static int full_tree;
static int reference_excluded_commits;
static int show_original_ids;
static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
static struct string_list tag_refs = STRING_LIST_INIT_NODUP;
static struct refspec refspecs = REFSPEC_INIT_FETCH;
static int anonymize;
static struct revision_sources revision_sources;
static int parse_opt_signed_tag_mode(const struct option *opt,
const char *arg, int unset)
{
if (unset || !strcmp(arg, "abort"))
signed_tag_mode = SIGNED_TAG_ABORT;
else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
signed_tag_mode = VERBATIM;
else if (!strcmp(arg, "warn"))
signed_tag_mode = WARN;
else if (!strcmp(arg, "warn-strip"))
signed_tag_mode = WARN_STRIP;
else if (!strcmp(arg, "strip"))
signed_tag_mode = STRIP;
else
return error("Unknown signed-tags mode: %s", arg);
return 0;
}
static int parse_opt_tag_of_filtered_mode(const struct option *opt,
const char *arg, int unset)
{
if (unset || !strcmp(arg, "abort"))
tag_of_filtered_mode = TAG_FILTERING_ABORT;
else if (!strcmp(arg, "drop"))
tag_of_filtered_mode = DROP;
else if (!strcmp(arg, "rewrite"))
tag_of_filtered_mode = REWRITE;
else
return error("Unknown tag-of-filtered mode: %s", arg);
return 0;
}
static int parse_opt_reencode_mode(const struct option *opt,
const char *arg, int unset)
{
if (unset) {
reencode_mode = REENCODE_ABORT;
return 0;
}
switch (git_parse_maybe_bool(arg)) {
case 0:
reencode_mode = REENCODE_NO;
break;
case 1:
reencode_mode = REENCODE_YES;
break;
default:
if (!strcasecmp(arg, "abort"))
reencode_mode = REENCODE_ABORT;
else
return error("Unknown reencoding mode: %s", arg);
}
return 0;
}
static struct decoration idnums;
static uint32_t last_idnum;
static int has_unshown_parent(struct commit *commit)
{
struct commit_list *parent;
for (parent = commit->parents; parent; parent = parent->next)
if (!(parent->item->object.flags & SHOWN) &&
!(parent->item->object.flags & UNINTERESTING))
return 1;
return 0;
}
struct anonymized_entry {
struct hashmap_entry hash;
const char *orig;
size_t orig_len;
const char *anon;
size_t anon_len;
};
static int anonymized_entry_cmp(const void *unused_cmp_data,
const void *va, const void *vb,
const void *unused_keydata)
{
const struct anonymized_entry *a = va, *b = vb;
return a->orig_len != b->orig_len ||
memcmp(a->orig, b->orig, a->orig_len);
}
/*
* Basically keep a cache of X->Y so that we can repeatedly replace
* the same anonymized string with another. The actual generation
* is farmed out to the generate function.
*/
static const void *anonymize_mem(struct hashmap *map,
void *(*generate)(const void *, size_t *),
const void *orig, size_t *len)
{
struct anonymized_entry key, *ret;
if (!map->cmpfn)
hashmap_init(map, anonymized_entry_cmp, NULL, 0);
hashmap_entry_init(&key, memhash(orig, *len));
key.orig = orig;
key.orig_len = *len;
ret = hashmap_get(map, &key, NULL);
if (!ret) {
ret = xmalloc(sizeof(*ret));
hashmap_entry_init(&ret->hash, key.hash.hash);
ret->orig = xstrdup(orig);
ret->orig_len = *len;
ret->anon = generate(orig, len);
ret->anon_len = *len;
hashmap_put(map, ret);
}
*len = ret->anon_len;
return ret->anon;
}
/*
* We anonymize each component of a path individually,
* so that paths a/b and a/c will share a common root.
* The paths are cached via anonymize_mem so that repeated
* lookups for "a" will yield the same value.
*/
static void anonymize_path(struct strbuf *out, const char *path,
struct hashmap *map,
void *(*generate)(const void *, size_t *))
{
while (*path) {
const char *end_of_component = strchrnul(path, '/');
size_t len = end_of_component - path;
const char *c = anonymize_mem(map, generate, path, &len);
strbuf_add(out, c, len);
path = end_of_component;
if (*path)
strbuf_addch(out, *path++);
}
}
static inline void *mark_to_ptr(uint32_t mark)
{
return (void *)(uintptr_t)mark;
}
static inline uint32_t ptr_to_mark(void * mark)
{
return (uint32_t)(uintptr_t)mark;
}
static inline void mark_object(struct object *object, uint32_t mark)
{
add_decoration(&idnums, object, mark_to_ptr(mark));
}
static inline void mark_next_object(struct object *object)
{
mark_object(object, ++last_idnum);
}
static int get_object_mark(struct object *object)
{
void *decoration = lookup_decoration(&idnums, object);
if (!decoration)
return 0;
return ptr_to_mark(decoration);
}
static struct commit *rewrite_commit(struct commit *p)
{
for (;;) {
if (p->parents && p->parents->next)
break;
if (p->object.flags & UNINTERESTING)
break;
if (!(p->object.flags & TREESAME))
break;
if (!p->parents)
return NULL;
p = p->parents->item;
}
return p;
}
static void show_progress(void)
{
static int counter = 0;
if (!progress)
return;
if ((++counter % progress) == 0)
printf("progress %d objects\n", counter);
}
/*
* Ideally we would want some transformation of the blob data here
* that is unreversible, but would still be the same size and have
* the same data relationship to other blobs (so that we get the same
* delta and packing behavior as the original). But the first and last
* requirements there are probably mutually exclusive, so let's take
* the easy way out for now, and just generate arbitrary content.
*
* There's no need to cache this result with anonymize_mem, since
* we already handle blob content caching with marks.
*/
static char *anonymize_blob(unsigned long *size)
{
static int counter;
struct strbuf out = STRBUF_INIT;
strbuf_addf(&out, "anonymous blob %d", counter++);
*size = out.len;
return strbuf_detach(&out, NULL);
}
static void export_blob(const struct object_id *oid)
{
unsigned long size;
enum object_type type;
char *buf;
struct object *object;
int eaten;
if (no_data)
return;
if (is_null_oid(oid))
return;
object = lookup_object(the_repository, oid);
if (object && object->flags & SHOWN)
return;
if (anonymize) {
buf = anonymize_blob(&size);
object = (struct object *)lookup_blob(the_repository, oid);
eaten = 0;
} else {
buf = read_object_file(oid, &type, &size);
if (!buf)
die("could not read blob %s", oid_to_hex(oid));
if (check_object_signature(oid, buf, size, type_name(type)) < 0)
die("oid mismatch in blob %s", oid_to_hex(oid));
object = parse_object_buffer(the_repository, oid, type,
size, buf, &eaten);
}
if (!object)
die("Could not read blob %s", oid_to_hex(oid));
mark_next_object(object);
printf("blob\nmark :%"PRIu32"\n", last_idnum);
if (show_original_ids)
printf("original-oid %s\n", oid_to_hex(oid));
printf("data %"PRIuMAX"\n", (uintmax_t)size);
if (size && fwrite(buf, size, 1, stdout) != 1)
die_errno("could not write blob '%s'", oid_to_hex(oid));
printf("\n");
show_progress();
object->flags |= SHOWN;
if (!eaten)
free(buf);
}
static int depth_first(const void *a_, const void *b_)
{
const struct diff_filepair *a = *((const struct diff_filepair **)a_);
const struct diff_filepair *b = *((const struct diff_filepair **)b_);
const char *name_a, *name_b;
int len_a, len_b, len;
int cmp;
name_a = a->one ? a->one->path : a->two->path;
name_b = b->one ? b->one->path : b->two->path;
len_a = strlen(name_a);
len_b = strlen(name_b);
len = (len_a < len_b) ? len_a : len_b;
/* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
cmp = memcmp(name_a, name_b, len);
if (cmp)
return cmp;
cmp = len_b - len_a;
if (cmp)
return cmp;
/*
* Move 'R'ename entries last so that all references of the file
* appear in the output before it is renamed (e.g., when a file
* was copied and renamed in the same commit).
*/
return (a->status == 'R') - (b->status == 'R');
}
static void print_path_1(const char *path)
{
int need_quote = quote_c_style(path, NULL, NULL, 0);
if (need_quote)
quote_c_style(path, NULL, stdout, 0);
else if (strchr(path, ' '))
printf("\"%s\"", path);
else
printf("%s", path);
}
static void *anonymize_path_component(const void *path, size_t *len)
{
static int counter;
struct strbuf out = STRBUF_INIT;
strbuf_addf(&out, "path%d", counter++);
return strbuf_detach(&out, len);
}
static void print_path(const char *path)
{
if (!anonymize)
print_path_1(path);
else {
static struct hashmap paths;
static struct strbuf anon = STRBUF_INIT;
anonymize_path(&anon, path, &paths, anonymize_path_component);
print_path_1(anon.buf);
strbuf_reset(&anon);
}
}
static void *generate_fake_oid(const void *old, size_t *len)
{
static uint32_t counter = 1; /* avoid null oid */
const unsigned hashsz = the_hash_algo->rawsz;
unsigned char *out = xcalloc(hashsz, 1);
put_be32(out + hashsz - 4, counter++);
return out;
}
static const struct object_id *anonymize_oid(const struct object_id *oid)
{
static struct hashmap objs;
size_t len = the_hash_algo->rawsz;
return anonymize_mem(&objs, generate_fake_oid, oid, &len);
}
static void show_filemodify(struct diff_queue_struct *q,
struct diff_options *options, void *data)
{
int i;
struct string_list *changed = data;
/*
* Handle files below a directory first, in case they are all deleted
* and the directory changes to a file or symlink.
*/
QSORT(q->queue, q->nr, depth_first);
for (i = 0; i < q->nr; i++) {
struct diff_filespec *ospec = q->queue[i]->one;
struct diff_filespec *spec = q->queue[i]->two;
switch (q->queue[i]->status) {
case DIFF_STATUS_DELETED:
printf("D ");
print_path(spec->path);
string_list_insert(changed, spec->path);
putchar('\n');
break;
case DIFF_STATUS_COPIED:
case DIFF_STATUS_RENAMED:
/*
* If a change in the file corresponding to ospec->path
* has been observed, we cannot trust its contents
* because the diff is calculated based on the prior
* contents, not the current contents. So, declare a
* copy or rename only if there was no change observed.
*/
if (!string_list_has_string(changed, ospec->path)) {
printf("%c ", q->queue[i]->status);
print_path(ospec->path);
putchar(' ');
print_path(spec->path);
string_list_insert(changed, spec->path);
putchar('\n');
if (oideq(&ospec->oid, &spec->oid) &&
ospec->mode == spec->mode)
break;
}
/* fallthrough */
case DIFF_STATUS_TYPE_CHANGED:
case DIFF_STATUS_MODIFIED:
case DIFF_STATUS_ADDED:
/*
* Links refer to objects in another repositories;
* output the SHA-1 verbatim.
*/
if (no_data || S_ISGITLINK(spec->mode))
printf("M %06o %s ", spec->mode,
oid_to_hex(anonymize ?
anonymize_oid(&spec->oid) :
&spec->oid));
else {
struct object *object = lookup_object(the_repository,
&spec->oid);
printf("M %06o :%d ", spec->mode,
get_object_mark(object));
}
print_path(spec->path);
string_list_insert(changed, spec->path);
putchar('\n');
break;
default:
die("Unexpected comparison status '%c' for %s, %s",
q->queue[i]->status,
ospec->path ? ospec->path : "none",
spec->path ? spec->path : "none");
}
}
}
static const char *find_encoding(const char *begin, const char *end)
{
const char *needle = "\nencoding ";
char *bol, *eol;
bol = memmem(begin, end ? end - begin : strlen(begin),
needle, strlen(needle));
if (!bol)
return NULL;
bol += strlen(needle);
eol = strchrnul(bol, '\n');
*eol = '\0';
return bol;
}
static void *anonymize_ref_component(const void *old, size_t *len)
{
static int counter;
struct strbuf out = STRBUF_INIT;
strbuf_addf(&out, "ref%d", counter++);
return strbuf_detach(&out, len);
}
static const char *anonymize_refname(const char *refname)
{
/*
* If any of these prefixes is found, we will leave it intact
* so that tags remain tags and so forth.
*/
static const char *prefixes[] = {
"refs/heads/",
"refs/tags/",
"refs/remotes/",
"refs/"
};
static struct hashmap refs;
static struct strbuf anon = STRBUF_INIT;
int i;
/*
* We also leave "master" as a special case, since it does not reveal
* anything interesting.
*/
if (!strcmp(refname, "refs/heads/master"))
return refname;
strbuf_reset(&anon);
for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
if (skip_prefix(refname, prefixes[i], &refname)) {
strbuf_addstr(&anon, prefixes[i]);
break;
}
}
anonymize_path(&anon, refname, &refs, anonymize_ref_component);
return anon.buf;
}
/*
* We do not even bother to cache commit messages, as they are unlikely
* to be repeated verbatim, and it is not that interesting when they are.
*/
static char *anonymize_commit_message(const char *old)
{
static int counter;
return xstrfmt("subject %d\n\nbody\n", counter++);
}
static struct hashmap idents;
static void *anonymize_ident(const void *old, size_t *len)
{
static int counter;
struct strbuf out = STRBUF_INIT;
counter++;
return strbuf_detach(&out, len);
}
/*
* Our strategy here is to anonymize the names and email addresses,
* but keep timestamps intact, as they influence things like traversal
* order (and by themselves should not be too revealing).
*/
static void anonymize_ident_line(const char **beg, const char **end)
{
static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT };
static unsigned which_buffer;
struct strbuf *out;
struct ident_split split;
const char *end_of_header;
out = &buffers[which_buffer++];
which_buffer %= ARRAY_SIZE(buffers);
strbuf_reset(out);
/* skip "committer", "author", "tagger", etc */
end_of_header = strchr(*beg, ' ');
if (!end_of_header)
BUG("malformed line fed to anonymize_ident_line: %.*s",
(int)(*end - *beg), *beg);
end_of_header++;
strbuf_add(out, *beg, end_of_header - *beg);
if (!split_ident_line(&split, end_of_header, *end - end_of_header) &&
split.date_begin) {
const char *ident;
size_t len;
len = split.mail_end - split.name_begin;
ident = anonymize_mem(&idents, anonymize_ident,
split.name_begin, &len);
strbuf_add(out, ident, len);
strbuf_addch(out, ' ');
strbuf_add(out, split.date_begin, split.tz_end - split.date_begin);
} else {
}
*beg = out->buf;
*end = out->buf + out->len;
}
static void handle_commit(struct commit *commit, struct rev_info *rev,
struct string_list *paths_of_changed_objects)
{
int saved_output_format = rev->diffopt.output_format;
const char *commit_buffer;
const char *author, *author_end, *committer, *committer_end;
const char *encoding, *message;
char *reencoded = NULL;
struct commit_list *p;
const char *refname;
int i;
rev->diffopt.output_format = DIFF_FORMAT_CALLBACK;
parse_commit_or_die(commit);
commit_buffer = get_commit_buffer(commit, NULL);
author = strstr(commit_buffer, "\nauthor ");
if (!author)
die("could not find author in commit %s",
oid_to_hex(&commit->object.oid));
author++;
author_end = strchrnul(author, '\n');
committer = strstr(author_end, "\ncommitter ");
if (!committer)
die("could not find committer in commit %s",
oid_to_hex(&commit->object.oid));
committer++;
committer_end = strchrnul(committer, '\n');
message = strstr(committer_end, "\n\n");
encoding = find_encoding(committer_end, message);
if (message)
message += 2;
if (commit->parents &&
(get_object_mark(&commit->parents->item->object) != 0 ||
reference_excluded_commits) &&
!full_tree) {
parse_commit_or_die(commit->parents->item);
diff_tree_oid(get_commit_tree_oid(commit->parents->item),
get_commit_tree_oid(commit), "", &rev->diffopt);
}
else
diff_root_tree_oid(get_commit_tree_oid(commit),
"", &rev->diffopt);
/* Export the referenced blobs, and remember the marks. */
for (i = 0; i < diff_queued_diff.nr; i++)
if (!S_ISGITLINK(diff_queued_diff.queue[i]->two->mode))
export_blob(&diff_queued_diff.queue[i]->two->oid);
refname = *revision_sources_at(&revision_sources, commit);
/*
* FIXME: string_list_remove() below for each ref is overall
* O(N^2). Compared to a history walk and diffing trees, this is
* just lost in the noise in practice. However, theoretically a
* repo may have enough refs for this to become slow.
*/
string_list_remove(&extra_refs, refname, 0);
if (anonymize) {
refname = anonymize_refname(refname);
anonymize_ident_line(&committer, &committer_end);
anonymize_ident_line(&author, &author_end);
}
mark_next_object(&commit->object);
if (anonymize) {
reencoded = anonymize_commit_message(message);
} else if (encoding) {
switch(reencode_mode) {
case REENCODE_YES:
reencoded = reencode_string(message, "UTF-8", encoding);
break;
case REENCODE_NO:
break;
case REENCODE_ABORT:
die("Encountered commit-specific encoding %s in commit "
"%s; use --reencode=[yes|no] to handle it",
encoding, oid_to_hex(&commit->object.oid));
}
}
if (!commit->parents)
printf("reset %s\n", refname);
printf("commit %s\nmark :%"PRIu32"\n", refname, last_idnum);
if (show_original_ids)
printf("original-oid %s\n", oid_to_hex(&commit->object.oid));
printf("%.*s\n%.*s\n",
(int)(author_end - author), author,
(int)(committer_end - committer), committer);
if (!reencoded && encoding)
printf("encoding %s\n", encoding);
printf("data %u\n%s",
(unsigned)(reencoded
? strlen(reencoded) : message
? strlen(message) : 0),
reencoded ? reencoded : message ? message : "");
free(reencoded);
unuse_commit_buffer(commit, commit_buffer);
for (i = 0, p = commit->parents; p; p = p->next) {
struct object *obj = &p->item->object;
int mark = get_object_mark(obj);
if (!mark && !reference_excluded_commits)
continue;
if (i == 0)
printf("from ");
else
printf("merge ");
if (mark)
printf(":%d\n", mark);
else
printf("%s\n", oid_to_hex(anonymize ?
anonymize_oid(&obj->oid) :
&obj->oid));
i++;
}
if (full_tree)
printf("deleteall\n");
log_tree_diff_flush(rev);
string_list_clear(paths_of_changed_objects, 0);
rev->diffopt.output_format = saved_output_format;
printf("\n");
show_progress();
}
static void *anonymize_tag(const void *old, size_t *len)
{
static int counter;
struct strbuf out = STRBUF_INIT;
strbuf_addf(&out, "tag message %d", counter++);
return strbuf_detach(&out, len);
}
static void handle_tail(struct object_array *commits, struct rev_info *revs,
struct string_list *paths_of_changed_objects)
{
struct commit *commit;
while (commits->nr) {
commit = (struct commit *)object_array_pop(commits);
if (has_unshown_parent(commit)) {
/* Queue again, to be handled later */
add_object_array(&commit->object, NULL, commits);
return;
}
handle_commit(commit, revs, paths_of_changed_objects);
}
}
static void handle_tag(const char *name, struct tag *tag)
{
unsigned long size;
enum object_type type;
char *buf;
const char *tagger, *tagger_end, *message;
size_t message_size = 0;
struct object *tagged;
int tagged_mark;
struct commit *p;
/* Trees have no identifier in fast-export output, thus we have no way
* to output tags of trees, tags of tags of trees, etc. Simply omit
* such tags.
*/
tagged = tag->tagged;
while (tagged->type == OBJ_TAG) {
tagged = ((struct tag *)tagged)->tagged;
}
if (tagged->type == OBJ_TREE) {
warning("Omitting tag %s,\nsince tags of trees (or tags of tags of trees, etc.) are not supported.",
oid_to_hex(&tag->object.oid));
return;
}
buf = read_object_file(&tag->object.oid, &type, &size);
if (!buf)
die("could not read tag %s", oid_to_hex(&tag->object.oid));
message = memmem(buf, size, "\n\n", 2);
if (message) {
message += 2;
message_size = strlen(message);
}
tagger = memmem(buf, message ? message - buf : size, "\ntagger ", 8);
if (!tagger) {
if (fake_missing_tagger)
tagger = "tagger Unspecified Tagger "
"<unspecified-tagger> 0 +0000";
else
tagger = "";
tagger_end = tagger + strlen(tagger);
} else {
tagger++;
tagger_end = strchrnul(tagger, '\n');
if (anonymize)
anonymize_ident_line(&tagger, &tagger_end);
}
if (anonymize) {
name = anonymize_refname(name);
if (message) {
static struct hashmap tags;
message = anonymize_mem(&tags, anonymize_tag,
message, &message_size);
}
}
/* handle signed tags */
if (message) {
const char *signature = strstr(message,
"\n-----BEGIN PGP SIGNATURE-----\n");
if (signature)
switch(signed_tag_mode) {
case SIGNED_TAG_ABORT:
die("encountered signed tag %s; use "
"--signed-tags=<mode> to handle it",
oid_to_hex(&tag->object.oid));
case WARN:
warning("exporting signed tag %s",
oid_to_hex(&tag->object.oid));
/* fallthru */
case VERBATIM:
break;
case WARN_STRIP:
warning("stripping signature from tag %s",
oid_to_hex(&tag->object.oid));
/* fallthru */
case STRIP:
message_size = signature + 1 - message;
break;
}
}
/* handle tag->tagged having been filtered out due to paths specified */
tagged = tag->tagged;
tagged_mark = get_object_mark(tagged);
if (!tagged_mark) {
switch(tag_of_filtered_mode) {
case TAG_FILTERING_ABORT:
die("tag %s tags unexported object; use "
"--tag-of-filtered-object=<mode> to handle it",
oid_to_hex(&tag->object.oid));
case DROP:
/* Ignore this tag altogether */
free(buf);
return;
case REWRITE:
if (tagged->type != OBJ_COMMIT) {
die("tag %s tags unexported %s!",
oid_to_hex(&tag->object.oid),
type_name(tagged->type));
}
p = rewrite_commit((struct commit *)tagged);
if (!p) {
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
free(buf);
return;
}
tagged_mark = get_object_mark(&p->object);
}
}
if (starts_with(name, "refs/tags/"))
name += 10;
printf("tag %s\nfrom :%d\n", name, tagged_mark);
if (show_original_ids)
printf("original-oid %s\n", oid_to_hex(&tag->object.oid));
printf("%.*s%sdata %d\n%.*s\n",
(int)(tagger_end - tagger), tagger,
tagger == tagger_end ? "" : "\n",
(int)message_size, (int)message_size, message ? message : "");
free(buf);
}
static struct commit *get_commit(struct rev_cmdline_entry *e, char *full_name)
{
switch (e->item->type) {
case OBJ_COMMIT:
return (struct commit *)e->item;
case OBJ_TAG: {
struct tag *tag = (struct tag *)e->item;
/* handle nested tags */
while (tag && tag->object.type == OBJ_TAG) {
parse_object(the_repository, &tag->object.oid);
string_list_append(&tag_refs, full_name)->util = tag;
tag = (struct tag *)tag->tagged;
}
if (!tag)
die("Tag %s points nowhere?", e->name);
return (struct commit *)tag;
break;
}
default:
return NULL;
}
}
static void get_tags_and_duplicates(struct rev_cmdline_info *info)
{
int i;
for (i = 0; i < info->nr; i++) {
struct rev_cmdline_entry *e = info->rev + i;
struct object_id oid;
struct commit *commit;
char *full_name;
if (e->flags & UNINTERESTING)
continue;
if (dwim_ref(e->name, strlen(e->name), &oid, &full_name) != 1)
continue;
if (refspecs.nr) {
char *private;
private = apply_refspecs(&refspecs, full_name);
if (private) {
free(full_name);
full_name = private;
}
}
commit = get_commit(e, full_name);
if (!commit) {
warning("%s: Unexpected object of type %s, skipping.",
e->name,
type_name(e->item->type));
continue;
}
switch(commit->object.type) {
case OBJ_COMMIT:
break;
case OBJ_BLOB:
export_blob(&commit->object.oid);
continue;
default: /* OBJ_TAG (nested tags) is already handled */
warning("Tag points to object of unexpected type %s, skipping.",
type_name(commit->object.type));
continue;
}
/*
* Make sure this ref gets properly updated eventually, whether
* through a commit or manually at the end.
*/
if (e->item->type != OBJ_TAG)
string_list_append(&extra_refs, full_name)->util = commit;
if (!*revision_sources_at(&revision_sources, commit))
*revision_sources_at(&revision_sources, commit) = full_name;
}
string_list_sort(&extra_refs);
string_list_remove_duplicates(&extra_refs, 0);
}
static void handle_tags_and_duplicates(struct string_list *extras)
{
struct commit *commit;
int i;
for (i = extras->nr - 1; i >= 0; i--) {
const char *name = extras->items[i].string;
struct object *object = extras->items[i].util;
int mark;
switch (object->type) {
case OBJ_TAG:
handle_tag(name, (struct tag *)object);
break;
case OBJ_COMMIT:
if (anonymize)
name = anonymize_refname(name);
/* create refs pointing to already seen commits */
commit = rewrite_commit((struct commit *)object);
if (!commit) {
/*
* Neither this object nor any of its
* ancestors touch any relevant paths, so
* it has been filtered to nothing. Delete
* it.
*/
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
continue;
}
mark = get_object_mark(&commit->object);
if (!mark) {
/*
* Getting here means we have a commit which
* was excluded by a negative refspec (e.g.
* fast-export ^master master). If we are
* referencing excluded commits, set the ref
* to the exact commit. Otherwise, the user
* wants the branch exported but every commit
* in its history to be deleted, which basically
* just means deletion of the ref.
*/
if (!reference_excluded_commits) {