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Diffstat (limited to 'sha1_file.c')
-rw-r--r--sha1_file.c259
1 files changed, 133 insertions, 126 deletions
diff --git a/sha1_file.c b/sha1_file.c
index 956422ba4a..9152974642 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -18,6 +18,8 @@
#include "refs.h"
#include "pack-revindex.h"
#include "sha1-lookup.h"
+#include "bulk-checkin.h"
+#include "streaming.h"
#ifndef O_NOATIME
#if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
@@ -53,6 +55,8 @@ static struct cached_object empty_tree = {
0
};
+static struct packed_git *last_found_pack;
+
static struct cached_object *find_cached_object(const unsigned char *sha1)
{
int i;
@@ -225,7 +229,6 @@ char *sha1_pack_index_name(const unsigned char *sha1)
struct alternate_object_database *alt_odb_list;
static struct alternate_object_database **alt_odb_tail;
-static void read_info_alternates(const char * alternates, int depth);
static int git_open_noatime(const char *name);
/*
@@ -295,7 +298,7 @@ static int link_alt_odb_entry(const char * entry, int len, const char * relative
return -1;
}
}
- if (!memcmp(ent->base, objdir, pfxlen)) {
+ if (!strcmp(ent->base, objdir)) {
free(ent);
return -1;
}
@@ -350,7 +353,7 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
}
}
-static void read_info_alternates(const char * relative_base, int depth)
+void read_info_alternates(const char * relative_base, int depth)
{
char *map;
size_t mapsz;
@@ -719,6 +722,8 @@ void free_pack_by_name(const char *pack_name)
close_pack_index(p);
free(p->bad_object_sha1);
*pp = p->next;
+ if (last_found_pack == p)
+ last_found_pack = NULL;
free(p);
return;
}
@@ -726,6 +731,24 @@ void free_pack_by_name(const char *pack_name)
}
}
+static unsigned int get_max_fd_limit(void)
+{
+#ifdef RLIMIT_NOFILE
+ struct rlimit lim;
+
+ if (getrlimit(RLIMIT_NOFILE, &lim))
+ die_errno("cannot get RLIMIT_NOFILE");
+
+ return lim.rlim_cur;
+#elif defined(_SC_OPEN_MAX)
+ return sysconf(_SC_OPEN_MAX);
+#elif defined(OPEN_MAX)
+ return OPEN_MAX;
+#else
+ return 1; /* see the caller ;-) */
+#endif
+}
+
/*
* Do not call this directly as this leaks p->pack_fd on error return;
* call open_packed_git() instead.
@@ -742,13 +765,7 @@ static int open_packed_git_1(struct packed_git *p)
return error("packfile %s index unavailable", p->pack_name);
if (!pack_max_fds) {
- struct rlimit lim;
- unsigned int max_fds;
-
- if (getrlimit(RLIMIT_NOFILE, &lim))
- die_errno("cannot get RLIMIT_NOFILE");
-
- max_fds = lim.rlim_cur;
+ unsigned int max_fds = get_max_fd_limit();
/* Save 3 for stdin/stdout/stderr, 22 for work */
if (25 < max_fds)
@@ -1141,10 +1158,47 @@ static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
return NULL;
}
-int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
+/*
+ * With an in-core object data in "map", rehash it to make sure the
+ * object name actually matches "sha1" to detect object corruption.
+ * With "map" == NULL, try reading the object named with "sha1" using
+ * the streaming interface and rehash it to do the same.
+ */
+int check_sha1_signature(const unsigned char *sha1, void *map,
+ unsigned long size, const char *type)
{
unsigned char real_sha1[20];
- hash_sha1_file(map, size, type, real_sha1);
+ enum object_type obj_type;
+ struct git_istream *st;
+ git_SHA_CTX c;
+ char hdr[32];
+ int hdrlen;
+
+ if (map) {
+ hash_sha1_file(map, size, type, real_sha1);
+ return hashcmp(sha1, real_sha1) ? -1 : 0;
+ }
+
+ st = open_istream(sha1, &obj_type, &size, NULL);
+ if (!st)
+ return -1;
+
+ /* Generate the header */
+ hdrlen = sprintf(hdr, "%s %lu", typename(obj_type), size) + 1;
+
+ /* Sha1.. */
+ git_SHA1_Init(&c);
+ git_SHA1_Update(&c, hdr, hdrlen);
+ for (;;) {
+ char buf[1024 * 16];
+ ssize_t readlen = read_istream(st, buf, sizeof(buf));
+
+ if (!readlen)
+ break;
+ git_SHA1_Update(&c, buf, readlen);
+ }
+ git_SHA1_Final(real_sha1, &c);
+ close_istream(st);
return hashcmp(sha1, real_sha1) ? -1 : 0;
}
@@ -1201,6 +1255,11 @@ void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
if (!fstat(fd, &st)) {
*size = xsize_t(st.st_size);
+ if (!*size) {
+ /* mmap() is forbidden on empty files */
+ error("object file %s is empty", sha1_file_name(sha1));
+ return NULL;
+ }
map = xmmap(NULL, *size, PROT_READ, MAP_PRIVATE, fd, 0);
}
close(fd);
@@ -2009,54 +2068,58 @@ int is_pack_valid(struct packed_git *p)
return !open_packed_git(p);
}
+static int fill_pack_entry(const unsigned char *sha1,
+ struct pack_entry *e,
+ struct packed_git *p)
+{
+ off_t offset;
+
+ if (p->num_bad_objects) {
+ unsigned i;
+ for (i = 0; i < p->num_bad_objects; i++)
+ if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
+ return 0;
+ }
+
+ offset = find_pack_entry_one(sha1, p);
+ if (!offset)
+ return 0;
+
+ /*
+ * We are about to tell the caller where they can locate the
+ * requested object. We better make sure the packfile is
+ * still here and can be accessed before supplying that
+ * answer, as it may have been deleted since the index was
+ * loaded!
+ */
+ if (!is_pack_valid(p)) {
+ warning("packfile %s cannot be accessed", p->pack_name);
+ return 0;
+ }
+ e->offset = offset;
+ e->p = p;
+ hashcpy(e->sha1, sha1);
+ return 1;
+}
+
static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
{
- static struct packed_git *last_found = (void *)1;
struct packed_git *p;
- off_t offset;
prepare_packed_git();
if (!packed_git)
return 0;
- p = (last_found == (void *)1) ? packed_git : last_found;
- do {
- if (p->num_bad_objects) {
- unsigned i;
- for (i = 0; i < p->num_bad_objects; i++)
- if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
- goto next;
- }
+ if (last_found_pack && fill_pack_entry(sha1, e, last_found_pack))
+ return 1;
- offset = find_pack_entry_one(sha1, p);
- if (offset) {
- /*
- * We are about to tell the caller where they can
- * locate the requested object. We better make
- * sure the packfile is still here and can be
- * accessed before supplying that answer, as
- * it may have been deleted since the index
- * was loaded!
- */
- if (!is_pack_valid(p)) {
- warning("packfile %s cannot be accessed", p->pack_name);
- goto next;
- }
- e->offset = offset;
- e->p = p;
- hashcpy(e->sha1, sha1);
- last_found = p;
- return 1;
- }
+ for (p = packed_git; p; p = p->next) {
+ if (p == last_found_pack || !fill_pack_entry(sha1, e, p))
+ continue;
- next:
- if (p == last_found)
- p = packed_git;
- else
- p = p->next;
- if (p == last_found)
- p = p->next;
- } while (p);
+ last_found_pack = p;
+ return 1;
+ }
return 0;
}
@@ -2365,7 +2428,7 @@ int move_temp_to_file(const char *tmpfile, const char *filename)
unlink_or_warn(tmpfile);
if (ret) {
if (ret != EEXIST) {
- return error("unable to write sha1 filename %s: %s\n", filename, strerror(ret));
+ return error("unable to write sha1 filename %s: %s", filename, strerror(ret));
}
/* FIXME!!! Collision check here ? */
}
@@ -2451,15 +2514,15 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
git_SHA_CTX c;
unsigned char parano_sha1[20];
char *filename;
- static char tmpfile[PATH_MAX];
+ static char tmp_file[PATH_MAX];
filename = sha1_file_name(sha1);
- fd = create_tmpfile(tmpfile, sizeof(tmpfile), filename);
+ fd = create_tmpfile(tmp_file, sizeof(tmp_file), filename);
if (fd < 0) {
if (errno == EACCES)
- return error("insufficient permission for adding an object to repository database %s\n", get_object_directory());
+ return error("insufficient permission for adding an object to repository database %s", get_object_directory());
else
- return error("unable to create temporary sha1 filename %s: %s\n", tmpfile, strerror(errno));
+ return error("unable to create temporary file: %s", strerror(errno));
}
/* Set it up */
@@ -2504,12 +2567,12 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
struct utimbuf utb;
utb.actime = mtime;
utb.modtime = mtime;
- if (utime(tmpfile, &utb) < 0)
+ if (utime(tmp_file, &utb) < 0)
warning("failed utime() on %s: %s",
- tmpfile, strerror(errno));
+ tmp_file, strerror(errno));
}
- return move_temp_to_file(tmpfile, filename);
+ return move_temp_to_file(tmp_file, filename);
}
int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
@@ -2680,82 +2743,25 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
}
/*
- * This creates one packfile per large blob, because the caller
- * immediately wants the result sha1, and fast-import can report the
- * object name via marks mechanism only by closing the created
- * packfile.
+ * This creates one packfile per large blob unless bulk-checkin
+ * machinery is "plugged".
*
* This also bypasses the usual "convert-to-git" dance, and that is on
* purpose. We could write a streaming version of the converting
* functions and insert that before feeding the data to fast-import
- * (or equivalent in-core API described above), but the primary
- * motivation for trying to stream from the working tree file and to
- * avoid mmaping it in core is to deal with large binary blobs, and
- * by definition they do _not_ want to get any conversion.
+ * (or equivalent in-core API described above). However, that is
+ * somewhat complicated, as we do not know the size of the filter
+ * result, which we need to know beforehand when writing a git object.
+ * Since the primary motivation for trying to stream from the working
+ * tree file and to avoid mmaping it in core is to deal with large
+ * binary blobs, they generally do not want to get any conversion, and
+ * callers should avoid this code path when filters are requested.
*/
static int index_stream(unsigned char *sha1, int fd, size_t size,
enum object_type type, const char *path,
unsigned flags)
{
- struct child_process fast_import;
- char export_marks[512];
- const char *argv[] = { "fast-import", "--quiet", export_marks, NULL };
- char tmpfile[512];
- char fast_import_cmd[512];
- char buf[512];
- int len, tmpfd;
-
- strcpy(tmpfile, git_path("hashstream_XXXXXX"));
- tmpfd = git_mkstemp_mode(tmpfile, 0600);
- if (tmpfd < 0)
- die_errno("cannot create tempfile: %s", tmpfile);
- if (close(tmpfd))
- die_errno("cannot close tempfile: %s", tmpfile);
- sprintf(export_marks, "--export-marks=%s", tmpfile);
-
- memset(&fast_import, 0, sizeof(fast_import));
- fast_import.in = -1;
- fast_import.argv = argv;
- fast_import.git_cmd = 1;
- if (start_command(&fast_import))
- die_errno("index-stream: git fast-import failed");
-
- len = sprintf(fast_import_cmd, "blob\nmark :1\ndata %lu\n",
- (unsigned long) size);
- write_or_whine(fast_import.in, fast_import_cmd, len,
- "index-stream: feeding fast-import");
- while (size) {
- char buf[10240];
- size_t sz = size < sizeof(buf) ? size : sizeof(buf);
- ssize_t actual;
-
- actual = read_in_full(fd, buf, sz);
- if (actual < 0)
- die_errno("index-stream: reading input");
- if (write_in_full(fast_import.in, buf, actual) != actual)
- die_errno("index-stream: feeding fast-import");
- size -= actual;
- }
- if (close(fast_import.in))
- die_errno("index-stream: closing fast-import");
- if (finish_command(&fast_import))
- die_errno("index-stream: finishing fast-import");
-
- tmpfd = open(tmpfile, O_RDONLY);
- if (tmpfd < 0)
- die_errno("index-stream: cannot open fast-import mark");
- len = read(tmpfd, buf, sizeof(buf));
- if (len < 0)
- die_errno("index-stream: reading fast-import mark");
- if (close(tmpfd) < 0)
- die_errno("index-stream: closing fast-import mark");
- if (unlink(tmpfile))
- die_errno("index-stream: unlinking fast-import mark");
- if (len != 44 ||
- memcmp(":1 ", buf, 3) ||
- get_sha1_hex(buf + 3, sha1))
- die_errno("index-stream: unexpected fast-import mark: <%s>", buf);
- return 0;
+ return index_bulk_checkin(sha1, fd, size, type, path, flags);
}
int index_fd(unsigned char *sha1, int fd, struct stat *st,
@@ -2766,7 +2772,8 @@ int index_fd(unsigned char *sha1, int fd, struct stat *st,
if (!S_ISREG(st->st_mode))
ret = index_pipe(sha1, fd, type, path, flags);
- else if (size <= big_file_threshold || type != OBJ_BLOB)
+ else if (size <= big_file_threshold || type != OBJ_BLOB ||
+ (path && would_convert_to_git(path, NULL, 0, 0)))
ret = index_core(sha1, fd, size, type, path, flags);
else
ret = index_stream(sha1, fd, size, type, path, flags);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-16 20:53:35 +0000