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![Jeff King](/assets/img/avatar_default.png)
Sometimes users want to report a bug they experience on their repository, but they are not at liberty to share the contents of the repository. It would be useful if they could produce a repository that has a similar shape to its history and tree, but without leaking any information. This "anonymized" repository could then be shared with developers (assuming it still replicates the original problem). This patch implements an "--anonymize" option to fast-export, which generates a stream that can recreate such a repository. Producing a single stream makes it easy for the caller to verify that they are not leaking any useful information. You can get an overview of what will be shared by running a command like: git fast-export --anonymize --all | perl -pe 's/\d+/X/g' | sort -u | less which will show every unique line we generate, modulo any numbers (each anonymized token is assigned a number, like "User 0", and we replace it consistently in the output). In addition to anonymizing, this produces test cases that are relatively small (compared to the original repository) and fast to generate (compared to using filter-branch, or modifying the output of fast-export yourself). Here are numbers for git.git: $ time git fast-export --anonymize --all \ --tag-of-filtered-object=drop >output real 0m2.883s user 0m2.828s sys 0m0.052s $ gzip output $ ls -lh output.gz | awk '{print $5}' 2.9M Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
1073 lines
27 KiB
C
1073 lines
27 KiB
C
/*
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* "git fast-export" builtin command
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*
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* Copyright (C) 2007 Johannes E. Schindelin
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*/
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#include "builtin.h"
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#include "cache.h"
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#include "commit.h"
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#include "object.h"
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#include "tag.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "log-tree.h"
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#include "revision.h"
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#include "decorate.h"
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#include "string-list.h"
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#include "utf8.h"
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#include "parse-options.h"
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#include "quote.h"
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#include "remote.h"
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#include "blob.h"
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static const char *fast_export_usage[] = {
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N_("git fast-export [rev-list-opts]"),
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NULL
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};
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static int progress;
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static enum { ABORT, VERBATIM, WARN, WARN_STRIP, STRIP } signed_tag_mode = ABORT;
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static enum { ERROR, DROP, REWRITE } tag_of_filtered_mode = ERROR;
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static int fake_missing_tagger;
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static int use_done_feature;
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static int no_data;
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static int full_tree;
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static struct string_list extra_refs = STRING_LIST_INIT_NODUP;
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static struct refspec *refspecs;
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static int refspecs_nr;
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static int anonymize;
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static int parse_opt_signed_tag_mode(const struct option *opt,
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const char *arg, int unset)
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{
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if (unset || !strcmp(arg, "abort"))
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signed_tag_mode = ABORT;
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else if (!strcmp(arg, "verbatim") || !strcmp(arg, "ignore"))
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signed_tag_mode = VERBATIM;
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else if (!strcmp(arg, "warn"))
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signed_tag_mode = WARN;
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else if (!strcmp(arg, "warn-strip"))
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signed_tag_mode = WARN_STRIP;
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else if (!strcmp(arg, "strip"))
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signed_tag_mode = STRIP;
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else
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return error("Unknown signed-tags mode: %s", arg);
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return 0;
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}
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static int parse_opt_tag_of_filtered_mode(const struct option *opt,
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const char *arg, int unset)
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{
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if (unset || !strcmp(arg, "abort"))
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tag_of_filtered_mode = ERROR;
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else if (!strcmp(arg, "drop"))
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tag_of_filtered_mode = DROP;
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else if (!strcmp(arg, "rewrite"))
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tag_of_filtered_mode = REWRITE;
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else
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return error("Unknown tag-of-filtered mode: %s", arg);
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return 0;
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}
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static struct decoration idnums;
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static uint32_t last_idnum;
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static int has_unshown_parent(struct commit *commit)
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{
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struct commit_list *parent;
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for (parent = commit->parents; parent; parent = parent->next)
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if (!(parent->item->object.flags & SHOWN) &&
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!(parent->item->object.flags & UNINTERESTING))
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return 1;
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return 0;
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}
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struct anonymized_entry {
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struct hashmap_entry hash;
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const char *orig;
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size_t orig_len;
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const char *anon;
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size_t anon_len;
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};
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static int anonymized_entry_cmp(const void *va, const void *vb,
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const void *data)
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{
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const struct anonymized_entry *a = va, *b = vb;
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return a->orig_len != b->orig_len ||
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memcmp(a->orig, b->orig, a->orig_len);
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}
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/*
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* Basically keep a cache of X->Y so that we can repeatedly replace
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* the same anonymized string with another. The actual generation
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* is farmed out to the generate function.
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*/
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static const void *anonymize_mem(struct hashmap *map,
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void *(*generate)(const void *, size_t *),
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const void *orig, size_t *len)
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{
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struct anonymized_entry key, *ret;
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if (!map->cmpfn)
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hashmap_init(map, anonymized_entry_cmp, 0);
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hashmap_entry_init(&key, memhash(orig, *len));
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key.orig = orig;
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key.orig_len = *len;
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ret = hashmap_get(map, &key, NULL);
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if (!ret) {
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ret = xmalloc(sizeof(*ret));
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hashmap_entry_init(&ret->hash, key.hash.hash);
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ret->orig = xstrdup(orig);
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ret->orig_len = *len;
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ret->anon = generate(orig, len);
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ret->anon_len = *len;
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hashmap_put(map, ret);
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}
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*len = ret->anon_len;
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return ret->anon;
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}
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/*
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* We anonymize each component of a path individually,
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* so that paths a/b and a/c will share a common root.
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* The paths are cached via anonymize_mem so that repeated
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* lookups for "a" will yield the same value.
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*/
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static void anonymize_path(struct strbuf *out, const char *path,
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struct hashmap *map,
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void *(*generate)(const void *, size_t *))
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{
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while (*path) {
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const char *end_of_component = strchrnul(path, '/');
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size_t len = end_of_component - path;
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const char *c = anonymize_mem(map, generate, path, &len);
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strbuf_add(out, c, len);
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path = end_of_component;
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if (*path)
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strbuf_addch(out, *path++);
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}
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}
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/* Since intptr_t is C99, we do not use it here */
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static inline uint32_t *mark_to_ptr(uint32_t mark)
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{
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return ((uint32_t *)NULL) + mark;
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}
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static inline uint32_t ptr_to_mark(void * mark)
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{
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return (uint32_t *)mark - (uint32_t *)NULL;
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}
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static inline void mark_object(struct object *object, uint32_t mark)
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{
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add_decoration(&idnums, object, mark_to_ptr(mark));
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}
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static inline void mark_next_object(struct object *object)
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{
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mark_object(object, ++last_idnum);
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}
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static int get_object_mark(struct object *object)
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{
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void *decoration = lookup_decoration(&idnums, object);
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if (!decoration)
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return 0;
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return ptr_to_mark(decoration);
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}
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static void show_progress(void)
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{
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static int counter = 0;
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if (!progress)
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return;
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if ((++counter % progress) == 0)
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printf("progress %d objects\n", counter);
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}
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/*
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* Ideally we would want some transformation of the blob data here
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* that is unreversible, but would still be the same size and have
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* the same data relationship to other blobs (so that we get the same
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* delta and packing behavior as the original). But the first and last
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* requirements there are probably mutually exclusive, so let's take
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* the easy way out for now, and just generate arbitrary content.
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*
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* There's no need to cache this result with anonymize_mem, since
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* we already handle blob content caching with marks.
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*/
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static char *anonymize_blob(unsigned long *size)
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{
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static int counter;
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struct strbuf out = STRBUF_INIT;
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strbuf_addf(&out, "anonymous blob %d", counter++);
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*size = out.len;
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return strbuf_detach(&out, NULL);
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}
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static void export_blob(const unsigned char *sha1)
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{
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unsigned long size;
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enum object_type type;
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char *buf;
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struct object *object;
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int eaten;
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if (no_data)
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return;
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if (is_null_sha1(sha1))
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return;
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object = lookup_object(sha1);
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if (object && object->flags & SHOWN)
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return;
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if (anonymize) {
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buf = anonymize_blob(&size);
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object = (struct object *)lookup_blob(sha1);
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eaten = 0;
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} else {
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buf = read_sha1_file(sha1, &type, &size);
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if (!buf)
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die ("Could not read blob %s", sha1_to_hex(sha1));
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if (check_sha1_signature(sha1, buf, size, typename(type)) < 0)
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die("sha1 mismatch in blob %s", sha1_to_hex(sha1));
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object = parse_object_buffer(sha1, type, size, buf, &eaten);
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}
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if (!object)
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die("Could not read blob %s", sha1_to_hex(sha1));
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mark_next_object(object);
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printf("blob\nmark :%"PRIu32"\ndata %lu\n", last_idnum, size);
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if (size && fwrite(buf, size, 1, stdout) != 1)
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die_errno ("Could not write blob '%s'", sha1_to_hex(sha1));
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printf("\n");
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show_progress();
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object->flags |= SHOWN;
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if (!eaten)
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free(buf);
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}
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static int depth_first(const void *a_, const void *b_)
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{
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const struct diff_filepair *a = *((const struct diff_filepair **)a_);
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const struct diff_filepair *b = *((const struct diff_filepair **)b_);
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const char *name_a, *name_b;
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int len_a, len_b, len;
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int cmp;
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name_a = a->one ? a->one->path : a->two->path;
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name_b = b->one ? b->one->path : b->two->path;
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len_a = strlen(name_a);
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len_b = strlen(name_b);
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len = (len_a < len_b) ? len_a : len_b;
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/* strcmp will sort 'd' before 'd/e', we want 'd/e' before 'd' */
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cmp = memcmp(name_a, name_b, len);
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if (cmp)
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return cmp;
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cmp = len_b - len_a;
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if (cmp)
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return cmp;
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/*
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* Move 'R'ename entries last so that all references of the file
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* appear in the output before it is renamed (e.g., when a file
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* was copied and renamed in the same commit).
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*/
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return (a->status == 'R') - (b->status == 'R');
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}
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static void print_path_1(const char *path)
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{
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int need_quote = quote_c_style(path, NULL, NULL, 0);
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if (need_quote)
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quote_c_style(path, NULL, stdout, 0);
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else if (strchr(path, ' '))
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printf("\"%s\"", path);
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else
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printf("%s", path);
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}
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static void *anonymize_path_component(const void *path, size_t *len)
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{
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static int counter;
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struct strbuf out = STRBUF_INIT;
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strbuf_addf(&out, "path%d", counter++);
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return strbuf_detach(&out, len);
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}
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static void print_path(const char *path)
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{
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if (!anonymize)
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print_path_1(path);
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else {
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static struct hashmap paths;
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static struct strbuf anon = STRBUF_INIT;
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anonymize_path(&anon, path, &paths, anonymize_path_component);
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print_path_1(anon.buf);
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strbuf_reset(&anon);
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}
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}
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static void *generate_fake_sha1(const void *old, size_t *len)
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{
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static uint32_t counter = 1; /* avoid null sha1 */
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unsigned char *out = xcalloc(20, 1);
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put_be32(out + 16, counter++);
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return out;
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}
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static const unsigned char *anonymize_sha1(const unsigned char *sha1)
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{
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static struct hashmap sha1s;
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size_t len = 20;
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return anonymize_mem(&sha1s, generate_fake_sha1, sha1, &len);
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}
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static void show_filemodify(struct diff_queue_struct *q,
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struct diff_options *options, void *data)
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{
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int i;
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/*
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* Handle files below a directory first, in case they are all deleted
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* and the directory changes to a file or symlink.
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*/
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qsort(q->queue, q->nr, sizeof(q->queue[0]), depth_first);
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for (i = 0; i < q->nr; i++) {
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struct diff_filespec *ospec = q->queue[i]->one;
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struct diff_filespec *spec = q->queue[i]->two;
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switch (q->queue[i]->status) {
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case DIFF_STATUS_DELETED:
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printf("D ");
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print_path(spec->path);
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putchar('\n');
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break;
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case DIFF_STATUS_COPIED:
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case DIFF_STATUS_RENAMED:
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printf("%c ", q->queue[i]->status);
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print_path(ospec->path);
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putchar(' ');
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print_path(spec->path);
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putchar('\n');
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if (!hashcmp(ospec->sha1, spec->sha1) &&
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ospec->mode == spec->mode)
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break;
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/* fallthrough */
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case DIFF_STATUS_TYPE_CHANGED:
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case DIFF_STATUS_MODIFIED:
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case DIFF_STATUS_ADDED:
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/*
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* Links refer to objects in another repositories;
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* output the SHA-1 verbatim.
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*/
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if (no_data || S_ISGITLINK(spec->mode))
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printf("M %06o %s ", spec->mode,
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sha1_to_hex(anonymize ?
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anonymize_sha1(spec->sha1) :
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spec->sha1));
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else {
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struct object *object = lookup_object(spec->sha1);
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printf("M %06o :%d ", spec->mode,
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get_object_mark(object));
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}
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print_path(spec->path);
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putchar('\n');
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break;
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default:
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die("Unexpected comparison status '%c' for %s, %s",
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q->queue[i]->status,
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ospec->path ? ospec->path : "none",
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spec->path ? spec->path : "none");
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}
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}
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}
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static const char *find_encoding(const char *begin, const char *end)
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{
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const char *needle = "\nencoding ";
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char *bol, *eol;
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bol = memmem(begin, end ? end - begin : strlen(begin),
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needle, strlen(needle));
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if (!bol)
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return git_commit_encoding;
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bol += strlen(needle);
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eol = strchrnul(bol, '\n');
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*eol = '\0';
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return bol;
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}
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static void *anonymize_ref_component(const void *old, size_t *len)
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{
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static int counter;
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struct strbuf out = STRBUF_INIT;
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strbuf_addf(&out, "ref%d", counter++);
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return strbuf_detach(&out, len);
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}
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static const char *anonymize_refname(const char *refname)
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{
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/*
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* If any of these prefixes is found, we will leave it intact
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* so that tags remain tags and so forth.
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*/
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static const char *prefixes[] = {
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"refs/heads/",
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"refs/tags/",
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"refs/remotes/",
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"refs/"
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};
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static struct hashmap refs;
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static struct strbuf anon = STRBUF_INIT;
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int i;
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/*
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* We also leave "master" as a special case, since it does not reveal
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* anything interesting.
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*/
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if (!strcmp(refname, "refs/heads/master"))
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return refname;
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strbuf_reset(&anon);
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for (i = 0; i < ARRAY_SIZE(prefixes); i++) {
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if (skip_prefix(refname, prefixes[i], &refname)) {
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strbuf_addstr(&anon, prefixes[i]);
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break;
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}
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}
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anonymize_path(&anon, refname, &refs, anonymize_ref_component);
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return anon.buf;
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}
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/*
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* We do not even bother to cache commit messages, as they are unlikely
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* to be repeated verbatim, and it is not that interesting when they are.
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*/
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static char *anonymize_commit_message(const char *old)
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{
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static int counter;
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return xstrfmt("subject %d\n\nbody\n", counter++);
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}
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static struct hashmap idents;
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static void *anonymize_ident(const void *old, size_t *len)
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{
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static int counter;
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struct strbuf out = STRBUF_INIT;
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strbuf_addf(&out, "User %d <user%d@example.com>", counter, counter);
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counter++;
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return strbuf_detach(&out, len);
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}
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/*
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* Our strategy here is to anonymize the names and email addresses,
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* but keep timestamps intact, as they influence things like traversal
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* order (and by themselves should not be too revealing).
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*/
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static void anonymize_ident_line(const char **beg, const char **end)
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{
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static struct strbuf buffers[] = { STRBUF_INIT, STRBUF_INIT };
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static unsigned which_buffer;
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struct strbuf *out;
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struct ident_split split;
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const char *end_of_header;
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out = &buffers[which_buffer++];
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which_buffer %= ARRAY_SIZE(buffers);
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strbuf_reset(out);
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/* skip "committer", "author", "tagger", etc */
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|
end_of_header = strchr(*beg, ' ');
|
|
if (!end_of_header)
|
|
die("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 {
|
|
strbuf_addstr(out, "Malformed Ident <malformed@example.com> 0 -0000");
|
|
}
|
|
|
|
*beg = out->buf;
|
|
*end = out->buf + out->len;
|
|
}
|
|
|
|
static void handle_commit(struct commit *commit, struct rev_info *rev)
|
|
{
|
|
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",
|
|
sha1_to_hex(commit->object.sha1));
|
|
author++;
|
|
author_end = strchrnul(author, '\n');
|
|
committer = strstr(author_end, "\ncommitter ");
|
|
if (!committer)
|
|
die ("Could not find committer in commit %s",
|
|
sha1_to_hex(commit->object.sha1));
|
|
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 &&
|
|
!full_tree) {
|
|
parse_commit_or_die(commit->parents->item);
|
|
diff_tree_sha1(commit->parents->item->tree->object.sha1,
|
|
commit->tree->object.sha1, "", &rev->diffopt);
|
|
}
|
|
else
|
|
diff_root_tree_sha1(commit->tree->object.sha1,
|
|
"", &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->sha1);
|
|
|
|
refname = commit->util;
|
|
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 (!is_encoding_utf8(encoding))
|
|
reencoded = reencode_string(message, "UTF-8", encoding);
|
|
if (!commit->parents)
|
|
printf("reset %s\n", refname);
|
|
printf("commit %s\nmark :%"PRIu32"\n%.*s\n%.*s\ndata %u\n%s",
|
|
refname, last_idnum,
|
|
(int)(author_end - author), author,
|
|
(int)(committer_end - committer), committer,
|
|
(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) {
|
|
int mark = get_object_mark(&p->item->object);
|
|
if (!mark)
|
|
continue;
|
|
if (i == 0)
|
|
printf("from :%d\n", mark);
|
|
else
|
|
printf("merge :%d\n", mark);
|
|
i++;
|
|
}
|
|
|
|
if (full_tree)
|
|
printf("deleteall\n");
|
|
log_tree_diff_flush(rev);
|
|
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 commit *commit;
|
|
while (commits->nr) {
|
|
commit = (struct commit *)commits->objects[commits->nr - 1].item;
|
|
if (has_unshown_parent(commit))
|
|
return;
|
|
handle_commit(commit, revs);
|
|
commits->nr--;
|
|
}
|
|
}
|
|
|
|
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.",
|
|
sha1_to_hex(tag->object.sha1));
|
|
return;
|
|
}
|
|
|
|
buf = read_sha1_file(tag->object.sha1, &type, &size);
|
|
if (!buf)
|
|
die ("Could not read tag %s", sha1_to_hex(tag->object.sha1));
|
|
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 ABORT:
|
|
die ("Encountered signed tag %s; use "
|
|
"--signed-tags=<mode> to handle it.",
|
|
sha1_to_hex(tag->object.sha1));
|
|
case WARN:
|
|
warning ("Exporting signed tag %s",
|
|
sha1_to_hex(tag->object.sha1));
|
|
/* fallthru */
|
|
case VERBATIM:
|
|
break;
|
|
case WARN_STRIP:
|
|
warning ("Stripping signature from tag %s",
|
|
sha1_to_hex(tag->object.sha1));
|
|
/* 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 ABORT:
|
|
die ("Tag %s tags unexported object; use "
|
|
"--tag-of-filtered-object=<mode> to handle it.",
|
|
sha1_to_hex(tag->object.sha1));
|
|
case DROP:
|
|
/* Ignore this tag altogether */
|
|
return;
|
|
case REWRITE:
|
|
if (tagged->type != OBJ_COMMIT) {
|
|
die ("Tag %s tags unexported %s!",
|
|
sha1_to_hex(tag->object.sha1),
|
|
typename(tagged->type));
|
|
}
|
|
p = (struct commit *)tagged;
|
|
for (;;) {
|
|
if (p->parents && p->parents->next)
|
|
break;
|
|
if (p->object.flags & UNINTERESTING)
|
|
break;
|
|
if (!(p->object.flags & TREESAME))
|
|
break;
|
|
if (!p->parents)
|
|
die ("Can't find replacement commit for tag %s\n",
|
|
sha1_to_hex(tag->object.sha1));
|
|
p = p->parents->item;
|
|
}
|
|
tagged_mark = get_object_mark(&p->object);
|
|
}
|
|
}
|
|
|
|
if (starts_with(name, "refs/tags/"))
|
|
name += 10;
|
|
printf("tag %s\nfrom :%d\n%.*s%sdata %d\n%.*s\n",
|
|
name, tagged_mark,
|
|
(int)(tagger_end - tagger), tagger,
|
|
tagger == tagger_end ? "" : "\n",
|
|
(int)message_size, (int)message_size, message ? message : "");
|
|
}
|
|
|
|
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(tag->object.sha1);
|
|
string_list_append(&extra_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;
|
|
unsigned char sha1[20];
|
|
struct commit *commit;
|
|
char *full_name;
|
|
|
|
if (e->flags & UNINTERESTING)
|
|
continue;
|
|
|
|
if (dwim_ref(e->name, strlen(e->name), sha1, &full_name) != 1)
|
|
continue;
|
|
|
|
if (refspecs) {
|
|
char *private;
|
|
private = apply_refspecs(refspecs, refspecs_nr, 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,
|
|
typename(e->item->type));
|
|
continue;
|
|
}
|
|
|
|
switch(commit->object.type) {
|
|
case OBJ_COMMIT:
|
|
break;
|
|
case OBJ_BLOB:
|
|
export_blob(commit->object.sha1);
|
|
continue;
|
|
default: /* OBJ_TAG (nested tags) is already handled */
|
|
warning("Tag points to object of unexpected type %s, skipping.",
|
|
typename(commit->object.type));
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* This ref will not be updated through a commit, lets make
|
|
* sure it gets properly updated eventually.
|
|
*/
|
|
if (commit->util || commit->object.flags & SHOWN)
|
|
string_list_append(&extra_refs, full_name)->util = commit;
|
|
if (!commit->util)
|
|
commit->util = full_name;
|
|
}
|
|
}
|
|
|
|
static void handle_tags_and_duplicates(void)
|
|
{
|
|
struct commit *commit;
|
|
int i;
|
|
|
|
for (i = extra_refs.nr - 1; i >= 0; i--) {
|
|
const char *name = extra_refs.items[i].string;
|
|
struct object *object = extra_refs.items[i].util;
|
|
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 = (struct commit *)object;
|
|
printf("reset %s\nfrom :%d\n\n", name,
|
|
get_object_mark(&commit->object));
|
|
show_progress();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void export_marks(char *file)
|
|
{
|
|
unsigned int i;
|
|
uint32_t mark;
|
|
struct object_decoration *deco = idnums.hash;
|
|
FILE *f;
|
|
int e = 0;
|
|
|
|
f = fopen(file, "w");
|
|
if (!f)
|
|
die_errno("Unable to open marks file %s for writing.", file);
|
|
|
|
for (i = 0; i < idnums.size; i++) {
|
|
if (deco->base && deco->base->type == 1) {
|
|
mark = ptr_to_mark(deco->decoration);
|
|
if (fprintf(f, ":%"PRIu32" %s\n", mark,
|
|
sha1_to_hex(deco->base->sha1)) < 0) {
|
|
e = 1;
|
|
break;
|
|
}
|
|
}
|
|
deco++;
|
|
}
|
|
|
|
e |= ferror(f);
|
|
e |= fclose(f);
|
|
if (e)
|
|
error("Unable to write marks file %s.", file);
|
|
}
|
|
|
|
static void import_marks(char *input_file)
|
|
{
|
|
char line[512];
|
|
FILE *f = fopen(input_file, "r");
|
|
if (!f)
|
|
die_errno("cannot read '%s'", input_file);
|
|
|
|
while (fgets(line, sizeof(line), f)) {
|
|
uint32_t mark;
|
|
char *line_end, *mark_end;
|
|
unsigned char sha1[20];
|
|
struct object *object;
|
|
struct commit *commit;
|
|
enum object_type type;
|
|
|
|
line_end = strchr(line, '\n');
|
|
if (line[0] != ':' || !line_end)
|
|
die("corrupt mark line: %s", line);
|
|
*line_end = '\0';
|
|
|
|
mark = strtoumax(line + 1, &mark_end, 10);
|
|
if (!mark || mark_end == line + 1
|
|
|| *mark_end != ' ' || get_sha1_hex(mark_end + 1, sha1))
|
|
die("corrupt mark line: %s", line);
|
|
|
|
if (last_idnum < mark)
|
|
last_idnum = mark;
|
|
|
|
type = sha1_object_info(sha1, NULL);
|
|
if (type < 0)
|
|
die("object not found: %s", sha1_to_hex(sha1));
|
|
|
|
if (type != OBJ_COMMIT)
|
|
/* only commits */
|
|
continue;
|
|
|
|
commit = lookup_commit(sha1);
|
|
if (!commit)
|
|
die("not a commit? can't happen: %s", sha1_to_hex(sha1));
|
|
|
|
object = &commit->object;
|
|
|
|
if (object->flags & SHOWN)
|
|
error("Object %s already has a mark", sha1_to_hex(sha1));
|
|
|
|
mark_object(object, mark);
|
|
|
|
object->flags |= SHOWN;
|
|
}
|
|
fclose(f);
|
|
}
|
|
|
|
static void handle_deletes(void)
|
|
{
|
|
int i;
|
|
for (i = 0; i < refspecs_nr; i++) {
|
|
struct refspec *refspec = &refspecs[i];
|
|
if (*refspec->src)
|
|
continue;
|
|
|
|
printf("reset %s\nfrom %s\n\n",
|
|
refspec->dst, sha1_to_hex(null_sha1));
|
|
}
|
|
}
|
|
|
|
int cmd_fast_export(int argc, const char **argv, const char *prefix)
|
|
{
|
|
struct rev_info revs;
|
|
struct object_array commits = OBJECT_ARRAY_INIT;
|
|
struct commit *commit;
|
|
char *export_filename = NULL, *import_filename = NULL;
|
|
uint32_t lastimportid;
|
|
struct string_list refspecs_list = STRING_LIST_INIT_NODUP;
|
|
struct option options[] = {
|
|
OPT_INTEGER(0, "progress", &progress,
|
|
N_("show progress after <n> objects")),
|
|
OPT_CALLBACK(0, "signed-tags", &signed_tag_mode, N_("mode"),
|
|
N_("select handling of signed tags"),
|
|
parse_opt_signed_tag_mode),
|
|
OPT_CALLBACK(0, "tag-of-filtered-object", &tag_of_filtered_mode, N_("mode"),
|
|
N_("select handling of tags that tag filtered objects"),
|
|
parse_opt_tag_of_filtered_mode),
|
|
OPT_STRING(0, "export-marks", &export_filename, N_("file"),
|
|
N_("Dump marks to this file")),
|
|
OPT_STRING(0, "import-marks", &import_filename, N_("file"),
|
|
N_("Import marks from this file")),
|
|
OPT_BOOL(0, "fake-missing-tagger", &fake_missing_tagger,
|
|
N_("Fake a tagger when tags lack one")),
|
|
OPT_BOOL(0, "full-tree", &full_tree,
|
|
N_("Output full tree for each commit")),
|
|
OPT_BOOL(0, "use-done-feature", &use_done_feature,
|
|
N_("Use the done feature to terminate the stream")),
|
|
OPT_BOOL(0, "no-data", &no_data, N_("Skip output of blob data")),
|
|
OPT_STRING_LIST(0, "refspec", &refspecs_list, N_("refspec"),
|
|
N_("Apply refspec to exported refs")),
|
|
OPT_BOOL(0, "anonymize", &anonymize, N_("anonymize output")),
|
|
OPT_END()
|
|
};
|
|
|
|
if (argc == 1)
|
|
usage_with_options (fast_export_usage, options);
|
|
|
|
/* we handle encodings */
|
|
git_config(git_default_config, NULL);
|
|
|
|
init_revisions(&revs, prefix);
|
|
revs.topo_order = 1;
|
|
revs.show_source = 1;
|
|
revs.rewrite_parents = 1;
|
|
argc = parse_options(argc, argv, prefix, options, fast_export_usage,
|
|
PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN);
|
|
argc = setup_revisions(argc, argv, &revs, NULL);
|
|
if (argc > 1)
|
|
usage_with_options (fast_export_usage, options);
|
|
|
|
if (refspecs_list.nr) {
|
|
const char **refspecs_str;
|
|
int i;
|
|
|
|
refspecs_str = xmalloc(sizeof(*refspecs_str) * refspecs_list.nr);
|
|
for (i = 0; i < refspecs_list.nr; i++)
|
|
refspecs_str[i] = refspecs_list.items[i].string;
|
|
|
|
refspecs_nr = refspecs_list.nr;
|
|
refspecs = parse_fetch_refspec(refspecs_nr, refspecs_str);
|
|
|
|
string_list_clear(&refspecs_list, 1);
|
|
free(refspecs_str);
|
|
}
|
|
|
|
if (use_done_feature)
|
|
printf("feature done\n");
|
|
|
|
if (import_filename)
|
|
import_marks(import_filename);
|
|
lastimportid = last_idnum;
|
|
|
|
if (import_filename && revs.prune_data.nr)
|
|
full_tree = 1;
|
|
|
|
get_tags_and_duplicates(&revs.cmdline);
|
|
|
|
if (prepare_revision_walk(&revs))
|
|
die("revision walk setup failed");
|
|
revs.diffopt.format_callback = show_filemodify;
|
|
DIFF_OPT_SET(&revs.diffopt, RECURSIVE);
|
|
while ((commit = get_revision(&revs))) {
|
|
if (has_unshown_parent(commit)) {
|
|
add_object_array(&commit->object, NULL, &commits);
|
|
}
|
|
else {
|
|
handle_commit(commit, &revs);
|
|
handle_tail(&commits, &revs);
|
|
}
|
|
}
|
|
|
|
handle_tags_and_duplicates();
|
|
handle_deletes();
|
|
|
|
if (export_filename && lastimportid != last_idnum)
|
|
export_marks(export_filename);
|
|
|
|
if (use_done_feature)
|
|
printf("done\n");
|
|
|
|
free_refspec(refspecs_nr, refspecs);
|
|
|
|
return 0;
|
|
}
|