Apply some v2.48 regression bugfixes (#5376)

Now that most of the Git contributors are back from the holidays, there
is an influx of bug fixes. This is precisely why I held off from rushing
Git for Windows v2.48.0 out the door.

These bug fixes are mostly taken from upstream's branches; In some
cases, though, I had to apply them directly from the Git mailing list
because they did not make it into git/git yet.

I deem those bug fixes necessary to get Git for Windows into a somewhat
healthy state again.

Documentation/git-show-index.txt

@@ -9,7 +9,7 @@ git-show-index - Show packed archive index
 SYNOPSIS
 --------
 [verse]
-'git show-index' [--object-format=<hash-algorithm>]
+'git show-index' [--object-format=<hash-algorithm>] < <pack-idx-file>
 
 
 DESCRIPTION

builtin/branch.c

@@ -473,7 +473,7 @@ static void print_ref_list(struct ref_filter *filter, struct ref_sorting *sortin
 	if (verify_ref_format(format))
 		die(_("unable to parse format string"));
 
-	filter_ahead_behind(the_repository, format, &array);
+	filter_ahead_behind(the_repository, &array);
 	ref_array_sort(sorting, &array);
 
 	if (column_active(colopts)) {
@@ -884,7 +884,6 @@ int cmd_branch(int argc,
 		string_list_clear(&output, 0);
 		ref_sorting_release(sorting);
 		ref_filter_clear(&filter);
-		ref_format_clear(&format);
 
 		ret = 0;
 		goto out;

builtin/credential-cache--daemon.c

@@ -142,9 +142,9 @@ static void serve_one_client(FILE *in, FILE *out)
 				fprintf(out, "username=%s\n", e->item.username);
 			if (e->item.password)
 				fprintf(out, "password=%s\n", e->item.password);
-			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_HELPER) && e->item.authtype)
+			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_RESPONSE) && e->item.authtype)
 				fprintf(out, "authtype=%s\n", e->item.authtype);
-			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_HELPER) && e->item.credential)
+			if (credential_has_capability(&c.capa_authtype, CREDENTIAL_OP_RESPONSE) && e->item.credential)
 				fprintf(out, "credential=%s\n", e->item.credential);
 			if (e->item.password_expiry_utc != TIME_MAX)
 				fprintf(out, "password_expiry_utc=%"PRItime"\n",

builtin/fetch.c

@@ -1618,9 +1618,9 @@ static void report_set_head(const char *remote, const char *head_name,
 }
 
 static int set_head(const struct ref *remote_refs, int follow_remote_head,
-		const char *no_warn_branch)
+		const char *no_warn_branch, int mirror)
 {
-	int result = 0, create_only, is_bare, was_detached;
+	int result = 0, create_only, baremirror, was_detached;
 	struct strbuf b_head = STRBUF_INIT, b_remote_head = STRBUF_INIT,
 		      b_local_head = STRBUF_INIT;
 	const char *remote = gtransport->remote->name;
@@ -1655,17 +1655,17 @@ static int set_head(const struct ref *remote_refs, int follow_remote_head,
 
 	if (!head_name)
 		goto cleanup;
-	is_bare = is_bare_repository();
-	create_only = follow_remote_head == FOLLOW_REMOTE_ALWAYS ? 0 : !is_bare;
-	if (is_bare) {
+	baremirror = is_bare_repository() && mirror;
+	create_only = follow_remote_head == FOLLOW_REMOTE_ALWAYS ? 0 : !baremirror;
+	if (baremirror) {
 		strbuf_addstr(&b_head, "HEAD");
 		strbuf_addf(&b_remote_head, "refs/heads/%s", head_name);
 	} else {
 		strbuf_addf(&b_head, "refs/remotes/%s/HEAD", remote);
 		strbuf_addf(&b_remote_head, "refs/remotes/%s/%s", remote, head_name);
 	}
 		/* make sure it's valid */
-	if (!is_bare && !refs_ref_exists(refs, b_remote_head.buf)) {
+	if (!baremirror && !refs_ref_exists(refs, b_remote_head.buf)) {
 		result = 1;
 		goto cleanup;
 	}
@@ -1925,7 +1925,8 @@ static int do_fetch(struct transport *transport,
 		}
 	}
 	if (set_head(remote_refs, transport->remote->follow_remote_head,
-		transport->remote->no_warn_branch))
+		transport->remote->no_warn_branch,
+		transport->remote->mirror))
 		;
 		/*
 		 * Way too many cases where this can go wrong

builtin/for-each-ref.c

@@ -108,7 +108,6 @@ int cmd_for_each_ref(int argc,
 	filter_and_format_refs(&filter, flags, sorting, &format);
 
 	ref_filter_clear(&filter);
-	ref_format_clear(&format);
 	ref_sorting_release(sorting);
 	strvec_clear(&vec);
 	return 0;

builtin/index-pack.c

@@ -379,16 +379,18 @@ static const char *open_pack_file(const char *pack_name)
 
 static void parse_pack_header(void)
 {
-	struct pack_header *hdr = fill(sizeof(struct pack_header));
+	unsigned char *hdr = fill(sizeof(struct pack_header));
 
 	/* Header consistency check */
-	if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
+	if (get_be32(hdr) != PACK_SIGNATURE)
 		die(_("pack signature mismatch"));
-	if (!pack_version_ok(hdr->hdr_version))
+	hdr += 4;
+	if (!pack_version_ok_native(get_be32(hdr)))
 		die(_("pack version %"PRIu32" unsupported"),
-			ntohl(hdr->hdr_version));
+		    get_be32(hdr));
+	hdr += 4;
 
-	nr_objects = ntohl(hdr->hdr_entries);
+	nr_objects = get_be32(hdr);
 	use(sizeof(struct pack_header));
 }
 
@@ -1954,19 +1956,11 @@ int cmd_index_pack(int argc,
 					warning(_("no threads support, ignoring %s"), arg);
 					nr_threads = 1;
 				}
-			} else if (starts_with(arg, "--pack_header=")) {
-				struct pack_header *hdr;
-				char *c;
-
-				hdr = (struct pack_header *)input_buffer;
-				hdr->hdr_signature = htonl(PACK_SIGNATURE);
-				hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
-				if (*c != ',')
-					die(_("bad %s"), arg);
-				hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
-				if (*c)
-					die(_("bad %s"), arg);
-				input_len = sizeof(*hdr);
+			} else if (skip_prefix(arg, "--pack_header=", &arg)) {
+				if (parse_pack_header_option(arg,
+							     input_buffer,
+							     &input_len) < 0)
+					die(_("bad --pack_header: %s"), arg);
 			} else if (!strcmp(arg, "-v")) {
 				verbose = 1;
 			} else if (!strcmp(arg, "--progress-title")) {

builtin/show-index.c

@@ -9,7 +9,7 @@
 #include "parse-options.h"
 
 static const char *const show_index_usage[] = {
-	"git show-index [--object-format=<hash-algorithm>]",
+	"git show-index [--object-format=<hash-algorithm>] < <pack-idx-file>",
 	NULL
 };
 

builtin/tag.c

@@ -698,7 +698,6 @@ int cmd_tag(int argc,
 cleanup:
 	ref_sorting_release(sorting);
 	ref_filter_clear(&filter);
-	ref_format_clear(&format);
 	strbuf_release(&buf);
 	strbuf_release(&ref);
 	strbuf_release(&reflog_msg);

builtin/unpack-objects.c

@@ -18,6 +18,7 @@
 #include "progress.h"
 #include "decorate.h"
 #include "fsck.h"
+#include "packfile.h"
 
 static int dry_run, quiet, recover, has_errors, strict;
 static const char unpack_usage[] = "git unpack-objects [-n] [-q] [-r] [--strict]";
@@ -578,15 +579,16 @@ static void unpack_one(unsigned nr)
 static void unpack_all(void)
 {
 	int i;
-	struct pack_header *hdr = fill(sizeof(struct pack_header));
+	unsigned char *hdr = fill(sizeof(struct pack_header));
 
-	nr_objects = ntohl(hdr->hdr_entries);
-
-	if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
+	if (get_be32(hdr) != PACK_SIGNATURE)
 		die("bad pack file");
-	if (!pack_version_ok(hdr->hdr_version))
+	hdr += 4;
+	if (!pack_version_ok_native(get_be32(hdr)))
 		die("unknown pack file version %"PRIu32,
-			ntohl(hdr->hdr_version));
+		    get_be32(hdr));
+	hdr += 4;
+	nr_objects = get_be32(hdr);
 	use(sizeof(struct pack_header));
 
 	if (!quiet)
@@ -644,19 +646,10 @@ int cmd_unpack_objects(int argc,
 				fsck_set_msg_types(&fsck_options, arg);
 				continue;
 			}
-			if (starts_with(arg, "--pack_header=")) {
-				struct pack_header *hdr;
-				char *c;
-
-				hdr = (struct pack_header *)buffer;
-				hdr->hdr_signature = htonl(PACK_SIGNATURE);
-				hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
-				if (*c != ',')
-					die("bad %s", arg);
-				hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
-				if (*c)
-					die("bad %s", arg);
-				len = sizeof(*hdr);
+			if (skip_prefix(arg, "--pack_header=", &arg)) {
+				if (parse_pack_header_option(arg,
+							     buffer, &len) < 0)
+					die(_("bad --pack_header: %s"), arg);
 				continue;
 			}
 			if (skip_prefix(arg, "--max-input-size=", &arg)) {

builtin/verify-tag.c

@@ -69,6 +69,5 @@ int cmd_verify_tag(int argc,
 		if (format.format)
 			pretty_print_ref(name, &oid, &format);
 	}
-	ref_format_clear(&format);
 	return had_error;
 }

compat/bswap.h

@@ -183,23 +183,23 @@ static inline uint64_t get_be64(const void *ptr)
 static inline void put_be32(void *ptr, uint32_t value)
 {
 	unsigned char *p = ptr;
-	p[0] = value >> 24;
-	p[1] = value >> 16;
-	p[2] = value >>  8;
-	p[3] = value >>  0;
+	p[0] = (value >> 24) & 0xff;
+	p[1] = (value >> 16) & 0xff;
+	p[2] = (value >>  8) & 0xff;
+	p[3] = (value >>  0) & 0xff;
 }
 
 static inline void put_be64(void *ptr, uint64_t value)
 {
 	unsigned char *p = ptr;
-	p[0] = value >> 56;
-	p[1] = value >> 48;
-	p[2] = value >> 40;
-	p[3] = value >> 32;
-	p[4] = value >> 24;
-	p[5] = value >> 16;
-	p[6] = value >>  8;
-	p[7] = value >>  0;
+	p[0] = (value >> 56) & 0xff;
+	p[1] = (value >> 48) & 0xff;
+	p[2] = (value >> 40) & 0xff;
+	p[3] = (value >> 32) & 0xff;
+	p[4] = (value >> 24) & 0xff;
+	p[5] = (value >> 16) & 0xff;
+	p[6] = (value >>  8) & 0xff;
+	p[7] = (value >>  0) & 0xff;
 }
 
 #endif /* COMPAT_BSWAP_H */

grep.c

@@ -1646,6 +1646,8 @@ static int grep_source_1(struct grep_opt *opt, struct grep_source *gs, int colle
 
 	bol = gs->buf;
 	left = gs->size;
+	if (left && gs->buf[left-1] == '\n')
+		left--;
 	while (left) {
 		const char *eol;
 		int hit;

object-file.c

@@ -1970,54 +1970,59 @@ static void write_object_file_prepare_literally(const struct git_hash_algo *algo
 	hash_object_body(algo, &c, buf, len, oid, hdr, hdrlen);
 }
 
-static int check_collision(const char *filename_a, const char *filename_b)
+#define CHECK_COLLISION_DEST_VANISHED -2
+
+static int check_collision(const char *source, const char *dest)
 {
-	char buf_a[4096], buf_b[4096];
-	int fd_a = -1, fd_b = -1;
+	char buf_source[4096], buf_dest[4096];
+	int fd_source = -1, fd_dest = -1;
 	int ret = 0;
 
-	fd_a = open(filename_a, O_RDONLY);
-	if (fd_a < 0) {
-		ret = error_errno(_("unable to open %s"), filename_a);
+	fd_source = open(source, O_RDONLY);
+	if (fd_source < 0) {
+		ret = error_errno(_("unable to open %s"), source);
 		goto out;
 	}
 
-	fd_b = open(filename_b, O_RDONLY);
-	if (fd_b < 0) {
-		ret = error_errno(_("unable to open %s"), filename_b);
+	fd_dest = open(dest, O_RDONLY);
+	if (fd_dest < 0) {
+		if (errno != ENOENT)
+			ret = error_errno(_("unable to open %s"), dest);
+		else
+			ret = CHECK_COLLISION_DEST_VANISHED;
 		goto out;
 	}
 
 	while (1) {
 		ssize_t sz_a, sz_b;
 
-		sz_a = read_in_full(fd_a, buf_a, sizeof(buf_a));
+		sz_a = read_in_full(fd_source, buf_source, sizeof(buf_source));
 		if (sz_a < 0) {
-			ret = error_errno(_("unable to read %s"), filename_a);
+			ret = error_errno(_("unable to read %s"), source);
 			goto out;
 		}
 
-		sz_b = read_in_full(fd_b, buf_b, sizeof(buf_b));
+		sz_b = read_in_full(fd_dest, buf_dest, sizeof(buf_dest));
 		if (sz_b < 0) {
-			ret = error_errno(_("unable to read %s"), filename_b);
+			ret = error_errno(_("unable to read %s"), dest);
 			goto out;
 		}
 
-		if (sz_a != sz_b || memcmp(buf_a, buf_b, sz_a)) {
+		if (sz_a != sz_b || memcmp(buf_source, buf_dest, sz_a)) {
 			ret = error(_("files '%s' and '%s' differ in contents"),
-				    filename_a, filename_b);
+				    source, dest);
 			goto out;
 		}
 
-		if (sz_a < sizeof(buf_a))
+		if (sz_a < sizeof(buf_source))
 			break;
 	}
 
 out:
-	if (fd_a > -1)
-		close(fd_a);
-	if (fd_b > -1)
-		close(fd_b);
+	if (fd_source > -1)
+		close(fd_source);
+	if (fd_dest > -1)
+		close(fd_dest);
 	return ret;
 }
 
@@ -2032,8 +2037,11 @@ int finalize_object_file(const char *tmpfile, const char *filename)
 int finalize_object_file_flags(const char *tmpfile, const char *filename,
 			       enum finalize_object_file_flags flags)
 {
-	struct stat st;
-	int ret = 0;
+	unsigned retries = 0;
+	int ret;
+
+retry:
+	ret = 0;
 
 	if (object_creation_mode == OBJECT_CREATION_USES_RENAMES)
 		goto try_rename;
@@ -2054,6 +2062,8 @@ int finalize_object_file_flags(const char *tmpfile, const char *filename,
 	 * left to unlink.
 	 */
 	if (ret && ret != EEXIST) {
+		struct stat st;
+
 	try_rename:
 		if (!stat(filename, &st))
 			ret = EEXIST;
@@ -2069,9 +2079,17 @@ int finalize_object_file_flags(const char *tmpfile, const char *filename,
 			errno = saved_errno;
 			return error_errno(_("unable to write file %s"), filename);
 		}
-		if (!(flags & FOF_SKIP_COLLISION_CHECK) &&
-		    check_collision(tmpfile, filename))
+		if (!(flags & FOF_SKIP_COLLISION_CHECK)) {
+			ret = check_collision(tmpfile, filename);
+			if (ret == CHECK_COLLISION_DEST_VANISHED) {
+				if (retries++ > 5)
+					return error(_("unable to write repeatedly vanishing file %s"),
+						     filename);
+				goto retry;
+			}
+			else if (ret)
 				return -1;
+		}
 		unlink_or_warn(tmpfile);
 	}