Merge branch 'master' into jc/fmt-patch

* master:
  Split up builtin commands into separate files from git.c
  git-log produces no output
  fix pack-object buffer size
  mailinfo: decode underscore used in "Q" encoding properly.
  Reintroduce svn pools to solve the memory leak.
  pack-objects: do not stop at object that is "too small"
  git-commit --amend: two fixes.
  get_tree_entry(): make it available from tree-walk
  sha1_name.c: no need to include diff.h; tree-walk.h will do.
  sha1_name.c: prepare to make get_tree_entry() reusable from others.
  get_sha1() shorthands for blob/tree objects
  pre-commit hook: complain about conflict markers.
  git-merge: a bit more readable user guidance.
  diff: move diff.c to diff-lib.c to make room.
  git log: don't do merge diffs by default
  Allow "git repack" users to specify repacking window/depth
  Document git-clone --reference
  Fix filename scaling for binary files
  Fix uninteresting tags in new revision parsing

Conflicts:

    Adjusted the addition of fmt-patch to match the recent split
    from git.c to builtin.log.c.

20 files changed, 514 insertions, 369 deletions

diff --git a/Documentation/git-clone.txt b/Documentation/git-clone.txt
index 9ac54c282c..131e445747 100644
--- a/Documentation/git-clone.txt
+++ b/Documentation/git-clone.txt
@@ -10,6 +10,7 @@ SYNOPSIS
 --------
 [verse]
 'git-clone' [-l [-s]] [-q] [-n] [--bare] [-o <name>] [-u <upload-pack>]
+	  [--reference <repository>]
 	  <repository> [<directory>]
 
 DESCRIPTION
@@ -46,10 +47,18 @@ OPTIONS
 -s::
 	When the repository to clone is on the local machine,
 	instead of using hard links, automatically setup
-	.git/objects/info/alternatives to share the objects
+	.git/objects/info/alternates to share the objects
 	with the source repository.  The resulting repository
 	starts out without any object of its own.
 
+--reference <repository>::
+	If the reference repository is on the local machine
+	automatically setup .git/objects/info/alternates to
+	obtain objects from the reference repository.  Using
+	an already existing repository as an alternate will
+	require less objects to be copied from the repository
+	being cloned, reducing network and local storage costs.
+
 --quiet::
 -q::
 	Operate quietly.  This flag is passed to "rsync" and
@@ -112,6 +121,16 @@ $ git show-branch
 ------------
 
 
+Clone from upstream while borrowing from an existing local directory::
++
+------------
+$ git clone --reference my2.6 \
+	git://git.kernel.org/pub/scm/.../linux-2.7 \
+	my2.7
+$ cd my2.7
+------------
+
+
 Create a bare repository to publish your changes to the public::
 +
 ------------
diff --git a/Makefile b/Makefile
index 8aed3af016..a83c5029f4 100644
--- a/Makefile
+++ b/Makefile
@@ -199,7 +199,7 @@ LIB_H = \
 	tree-walk.h log-tree.h
 
 DIFF_OBJS = \
-	diff.o diffcore-break.o diffcore-order.o \
+	diff-lib.o diffcore-break.o diffcore-order.o \
 	diffcore-pickaxe.o diffcore-rename.o tree-diff.o combine-diff.o \
 	diffcore-delta.o log-tree.o
 
@@ -213,6 +213,9 @@ LIB_OBJS = \
 	fetch-clone.o revision.o pager.o tree-walk.o xdiff-interface.o \
 	$(DIFF_OBJS)
 
+BUILTIN_OBJS = \
+	builtin-log.o builtin-help.o
+
 GITLIBS = $(LIB_FILE) $(XDIFF_LIB)
 LIBS = $(GITLIBS) -lz
 
@@ -462,10 +465,10 @@ all:
 strip: $(PROGRAMS) git$X
 	$(STRIP) $(STRIP_OPTS) $(PROGRAMS) git$X
 
-git$X: git.c common-cmds.h $(GITLIBS)
+git$X: git.c common-cmds.h $(BUILTIN_OBJS) $(GITLIBS)
 	$(CC) -DGIT_VERSION='"$(GIT_VERSION)"' \
 		$(ALL_CFLAGS) -o $@ $(filter %.c,$^) \
-		$(ALL_LDFLAGS) $(LIBS)
+		$(BUILTIN_OBJS) $(ALL_LDFLAGS) $(LIBS)
 
 $(BUILT_INS): git$X
 	rm -f $@ && ln git$X $@
@@ -565,7 +568,7 @@ init-db.o: init-db.c
 	$(CC) -c $(ALL_CFLAGS) \
 		-DDEFAULT_GIT_TEMPLATE_DIR='"$(template_dir_SQ)"' $*.c
 
-$(LIB_OBJS): $(LIB_H)
+$(LIB_OBJS) $(BUILTIN_OBJS): $(LIB_H)
 $(patsubst git-%$X,%.o,$(PROGRAMS)): $(GITLIBS)
 $(DIFF_OBJS): diffcore.h
 
diff --git a/builtin-help.c b/builtin-help.c
new file mode 100644
index 0000000000..10a59cc403
--- /dev/null
+++ b/builtin-help.c
@@ -0,0 +1,241 @@
+/*
+ * builtin-help.c
+ *
+ * Builtin help-related commands (help, usage, version)
+ */
+#include "cache.h"
+#include "builtin.h"
+#include "exec_cmd.h"
+#include "common-cmds.h"
+
+static const char git_usage[] =
+	"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
+
+/* most gui terms set COLUMNS (although some don't export it) */
+static int term_columns(void)
+{
+	char *col_string = getenv("COLUMNS");
+	int n_cols = 0;
+
+	if (col_string && (n_cols = atoi(col_string)) > 0)
+		return n_cols;
+
+#ifdef TIOCGWINSZ
+	{
+		struct winsize ws;
+		if (!ioctl(1, TIOCGWINSZ, &ws)) {
+			if (ws.ws_col)
+				return ws.ws_col;
+		}
+	}
+#endif
+
+	return 80;
+}
+
+static void oom(void)
+{
+	fprintf(stderr, "git: out of memory\n");
+	exit(1);
+}
+
+static inline void mput_char(char c, unsigned int num)
+{
+	while(num--)
+		putchar(c);
+}
+
+static struct cmdname {
+	size_t len;
+	char name[1];
+} **cmdname;
+static int cmdname_alloc, cmdname_cnt;
+
+static void add_cmdname(const char *name, int len)
+{
+	struct cmdname *ent;
+	if (cmdname_alloc <= cmdname_cnt) {
+		cmdname_alloc = cmdname_alloc + 200;
+		cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
+		if (!cmdname)
+			oom();
+	}
+	ent = malloc(sizeof(*ent) + len);
+	if (!ent)
+		oom();
+	ent->len = len;
+	memcpy(ent->name, name, len);
+	ent->name[len] = 0;
+	cmdname[cmdname_cnt++] = ent;
+}
+
+static int cmdname_compare(const void *a_, const void *b_)
+{
+	struct cmdname *a = *(struct cmdname **)a_;
+	struct cmdname *b = *(struct cmdname **)b_;
+	return strcmp(a->name, b->name);
+}
+
+static void pretty_print_string_list(struct cmdname **cmdname, int longest)
+{
+	int cols = 1, rows;
+	int space = longest + 1; /* min 1 SP between words */
+	int max_cols = term_columns() - 1; /* don't print *on* the edge */
+	int i, j;
+
+	if (space < max_cols)
+		cols = max_cols / space;
+	rows = (cmdname_cnt + cols - 1) / cols;
+
+	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
+
+	for (i = 0; i < rows; i++) {
+		printf("  ");
+
+		for (j = 0; j < cols; j++) {
+			int n = j * rows + i;
+			int size = space;
+			if (n >= cmdname_cnt)
+				break;
+			if (j == cols-1 || n + rows >= cmdname_cnt)
+				size = 1;
+			printf("%-*s", size, cmdname[n]->name);
+		}
+		putchar('\n');
+	}
+}
+
+static void list_commands(const char *exec_path, const char *pattern)
+{
+	unsigned int longest = 0;
+	char path[PATH_MAX];
+	int dirlen;
+	DIR *dir = opendir(exec_path);
+	struct dirent *de;
+
+	if (!dir) {
+		fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
+		exit(1);
+	}
+
+	dirlen = strlen(exec_path);
+	if (PATH_MAX - 20 < dirlen) {
+		fprintf(stderr, "git: insanely long exec-path '%s'\n",
+			exec_path);
+		exit(1);
+	}
+
+	memcpy(path, exec_path, dirlen);
+	path[dirlen++] = '/';
+
+	while ((de = readdir(dir)) != NULL) {
+		struct stat st;
+		int entlen;
+
+		if (strncmp(de->d_name, "git-", 4))
+			continue;
+		strcpy(path+dirlen, de->d_name);
+		if (stat(path, &st) || /* stat, not lstat */
+		    !S_ISREG(st.st_mode) ||
+		    !(st.st_mode & S_IXUSR))
+			continue;
+
+		entlen = strlen(de->d_name);
+		if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
+			entlen -= 4;
+
+		if (longest < entlen)
+			longest = entlen;
+
+		add_cmdname(de->d_name + 4, entlen-4);
+	}
+	closedir(dir);
+
+	printf("git commands available in '%s'\n", exec_path);
+	printf("----------------------------");
+	mput_char('-', strlen(exec_path));
+	putchar('\n');
+	pretty_print_string_list(cmdname, longest - 4);
+	putchar('\n');
+}
+
+static void list_common_cmds_help(void)
+{
+	int i, longest = 0;
+
+	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+		if (longest < strlen(common_cmds[i].name))
+			longest = strlen(common_cmds[i].name);
+	}
+
+	puts("The most commonly used git commands are:");
+	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
+		printf("    %s", common_cmds[i].name);
+		mput_char(' ', longest - strlen(common_cmds[i].name) + 4);
+		puts(common_cmds[i].help);
+	}
+	puts("(use 'git help -a' to get a list of all installed git commands)");
+}
+
+void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
+{
+	if (fmt) {
+		va_list ap;
+
+		va_start(ap, fmt);
+		printf("git: ");
+		vprintf(fmt, ap);
+		va_end(ap);
+		putchar('\n');
+	}
+	else
+		puts(git_usage);
+
+	if (exec_path) {
+		putchar('\n');
+		if (show_all)
+			list_commands(exec_path, "git-*");
+		else
+			list_common_cmds_help();
+        }
+
+	exit(1);
+}
+
+static void show_man_page(const char *git_cmd)
+{
+	const char *page;
+
+	if (!strncmp(git_cmd, "git", 3))
+		page = git_cmd;
+	else {
+		int page_len = strlen(git_cmd) + 4;
+		char *p = malloc(page_len + 1);
+		strcpy(p, "git-");
+		strcpy(p + 4, git_cmd);
+		p[page_len] = 0;
+		page = p;
+	}
+
+	execlp("man", "man", page, NULL);
+}
+
+int cmd_version(int argc, const char **argv, char **envp)
+{
+	printf("git version %s\n", git_version_string);
+	return 0;
+}
+
+int cmd_help(int argc, const char **argv, char **envp)
+{
+	const char *help_cmd = argv[1];
+	if (!help_cmd)
+		cmd_usage(0, git_exec_path(), NULL);
+	else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
+		cmd_usage(1, git_exec_path(), NULL);
+	else
+		show_man_page(help_cmd);
+	return 0;
+}
+
+
diff --git a/builtin-log.c b/builtin-log.c
new file mode 100644
index 0000000000..a39aed6d86
--- /dev/null
+++ b/builtin-log.c
@@ -0,0 +1,108 @@
+/*
+ * Builtin "git log" and related commands (show, whatchanged)
+ *
+ * (C) Copyright 2006 Linus Torvalds
+ *		 2006 Junio Hamano
+ */
+#include "cache.h"
+#include "commit.h"
+#include "diff.h"
+#include "revision.h"
+#include "log-tree.h"
+#include "builtin.h"
+
+static int cmd_log_wc(int argc, const char **argv, char **envp,
+		      struct rev_info *rev)
+{
+	struct commit *commit;
+
+	rev->abbrev = DEFAULT_ABBREV;
+	rev->commit_format = CMIT_FMT_DEFAULT;
+	rev->verbose_header = 1;
+	argc = setup_revisions(argc, argv, rev, "HEAD");
+
+	if (argc > 1)
+		die("unrecognized argument: %s", argv[1]);
+
+	prepare_revision_walk(rev);
+	setup_pager();
+	while ((commit = get_revision(rev)) != NULL) {
+		log_tree_commit(rev, commit);
+		free(commit->buffer);
+		commit->buffer = NULL;
+	}
+	return 0;
+}
+
+int cmd_whatchanged(int argc, const char **argv, char **envp)
+{
+	struct rev_info rev;
+
+	init_revisions(&rev);
+	rev.diff = 1;
+	rev.diffopt.recursive = 1;
+	return cmd_log_wc(argc, argv, envp, &rev);
+}
+
+int cmd_show(int argc, const char **argv, char **envp)
+{
+	struct rev_info rev;
+
+	init_revisions(&rev);
+	rev.diff = 1;
+	rev.diffopt.recursive = 1;
+	rev.combine_merges = 1;
+	rev.dense_combined_merges = 1;
+	rev.always_show_header = 1;
+	rev.ignore_merges = 0;
+	rev.no_walk = 1;
+	return cmd_log_wc(argc, argv, envp, &rev);
+}
+
+int cmd_log(int argc, const char **argv, char **envp)
+{
+	struct rev_info rev;
+
+	init_revisions(&rev);
+	rev.always_show_header = 1;
+	rev.diffopt.recursive = 1;
+	return cmd_log_wc(argc, argv, envp, &rev);
+}
+
+int cmd_format_patch(int argc, const char **argv, char **envp)
+{
+	struct commit *commit;
+	struct commit **list = NULL;
+	struct rev_info rev;
+	int nr = 0;
+
+	init_revisions(&rev);
+	rev.commit_format = CMIT_FMT_EMAIL;
+	rev.verbose_header = 1;
+	rev.diff = 1;
+	rev.diffopt.with_raw = 0;
+	rev.diffopt.with_stat = 1;
+	rev.combine_merges = 0;
+	rev.ignore_merges = 1;
+	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
+	argc = setup_revisions(argc, argv, &rev, "HEAD");
+
+	prepare_revision_walk(&rev);
+	while ((commit = get_revision(&rev)) != NULL) {
+		nr++;
+		list = realloc(list, nr * sizeof(list[0]));
+		list[nr - 1] = commit;
+	}
+	while (0 <= --nr) {
+		int shown;
+		commit = list[nr];
+		shown = log_tree_commit(&rev, commit);
+		free(commit->buffer);
+		commit->buffer = NULL;
+		if (shown)
+			printf("-- \n%s\n\n", git_version_string);
+	}
+	free(list);
+	return 0;
+}
+
diff --git a/builtin.h b/builtin.h
new file mode 100644
index 0000000000..94dc0732f9
--- /dev/null
+++ b/builtin.h
@@ -0,0 +1,24 @@
+#ifndef BUILTIN_H
+#define BUILTIN_H
+
+#ifndef PATH_MAX
+# define PATH_MAX 4096
+#endif
+
+extern const char git_version_string[];
+
+void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
+#ifdef __GNUC__
+	__attribute__((__format__(__printf__, 3, 4), __noreturn__))
+#endif
+	;
+
+extern int cmd_help(int argc, const char **argv, char **envp);
+extern int cmd_version(int argc, const char **argv, char **envp);
+
+extern int cmd_whatchanged(int argc, const char **argv, char **envp);
+extern int cmd_show(int argc, const char **argv, char **envp);
+extern int cmd_log(int argc, const char **argv, char **envp);
+extern int cmd_format_patch(int argc, const char **argv, char **envp);
+
+#endif
diff --git a/diff.c b/diff-lib.c
index d75e0178ff..0a832c3585 100644
--- a/diff.c
+++ b/diff-lib.c
@@ -250,13 +250,14 @@ static void show_stats(struct diffstat_t* data)
 	for (i = 0; i < data->nr; i++) {
 		struct diffstat_file *file = data->files[i];
 
+		len = strlen(file->name);
+		if (max_len < len)
+			max_len = len;
+
 		if (file->is_binary || file->is_unmerged)
 			continue;
 		if (max_change < file->added + file->deleted)
 			max_change = file->added + file->deleted;
-		len = strlen(file->name);
-		if (max_len < len)
-			max_len = len;
 	}
 
 	for (i = 0; i < data->nr; i++) {
diff --git a/git-commit.sh b/git-commit.sh
index 01c73bdd08..26cd7ca54d 100755
--- a/git-commit.sh
+++ b/git-commit.sh
@@ -167,8 +167,13 @@ run_status () {
 	fi
 	case "$committable" in
 	0)
-	    echo "nothing to commit"
-	    exit 1
+		case "$amend" in
+		t)
+			echo "# No changes" ;;
+		*)
+			echo "nothing to commit" ;;
+		esac
+		exit 1 ;;
 	esac
 	exit 0
     )
@@ -365,14 +370,16 @@ tt*)
   die "Only one of -c/-C/-F/-m can be used." ;;
 esac
 
-case "$#,$also$only" in
-*,tt)
+case "$#,$also,$only,$amend" in
+*,t,t,*)
   die "Only one of --include/--only can be used." ;;
-0,t)
+0,t,,* | 0,,t,)
   die "No paths with --include/--only does not make sense." ;;
-0,)
+0,,t,t)
+  only_include_assumed="# Clever... amending the last one with dirty index." ;;
+0,,,*)
   ;;
-*,)
+*,,,*)
   only_include_assumed="# Explicit paths specified without -i nor -o; assuming --only paths..."
   also=
   ;;
diff --git a/git-merge.sh b/git-merge.sh
index 78ab422e4e..b834e79c98 100755
--- a/git-merge.sh
+++ b/git-merge.sh
@@ -335,5 +335,5 @@ Conflicts:
 	then
 		git-rerere
 	fi
-	die "Automatic merge failed; fix up by hand"
+	die "Automatic merge failed; fix conflicts and then commit the result."
 fi
diff --git a/git-repack.sh b/git-repack.sh
index a5d349fd09..e0c9f323c3 100755
--- a/git-repack.sh
+++ b/git-repack.sh
@@ -5,9 +5,9 @@
 
 USAGE='[-a] [-d] [-f] [-l] [-n] [-q]'
 . git-sh-setup
-	
+
 no_update_info= all_into_one= remove_redundant=
-local= quiet= no_reuse_delta=
+local= quiet= no_reuse_delta= extra=
 while case "$#" in 0) break ;; esac
 do
 	case "$1" in
@@ -17,6 +17,8 @@ do
 	-q)	quiet=-q ;;
 	-f)	no_reuse_delta=--no-reuse-delta ;;
 	-l)	local=--local ;;
+	--window=*) extra="$extra $1" ;;
+	--depth=*) extra="$extra $1" ;;
 	*)	usage ;;
 	esac
 	shift
@@ -40,7 +42,7 @@ case ",$all_into_one," in
 	    find . -type f \( -name '*.pack' -o -name '*.idx' \) -print`
 	;;
 esac
-pack_objects="$pack_objects $local $quiet $no_reuse_delta"
+pack_objects="$pack_objects $local $quiet $no_reuse_delta$extra"
 name=$(git-rev-list --objects --all $rev_list 2>&1 |
 	git-pack-objects --non-empty $pack_objects .tmp-pack) ||
 	exit 1
diff --git a/git-svnimport.perl b/git-svnimport.perl
index 60ed7ae3ee..61f559f0a8 100755
--- a/git-svnimport.perl
+++ b/git-svnimport.perl
@@ -136,8 +136,10 @@ sub file {
 
 	print "... $rev $path ...\n" if $opt_v;
 	my (undef, $properties);
+	my $pool = SVN::Pool->new();
 	eval { (undef, $properties)
-		   = $self->{'svn'}->get_file($path,$rev,$fh); };
+		   = $self->{'svn'}->get_file($path,$rev,$fh,$pool); };
+	$pool->clear;
 	if($@) {
 		return undef if $@ =~ /Attempted to get checksum/;
 		die $@;
diff --git a/git.c b/git.c
index d5aa41df92..619c6654e4 100644
--- a/git.c
+++ b/git.c
@@ -11,215 +11,8 @@
 #include <sys/ioctl.h>
 #include "git-compat-util.h"
 #include "exec_cmd.h"
-#include "common-cmds.h"
 
-#include "cache.h"
-#include "commit.h"
-#include "diff.h"
-#include "revision.h"
-#include "log-tree.h"
-
-#ifndef PATH_MAX
-# define PATH_MAX 4096
-#endif
-
-static const char git_usage[] =
-	"Usage: git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
-
-/* most gui terms set COLUMNS (although some don't export it) */
-static int term_columns(void)
-{
-	char *col_string = getenv("COLUMNS");
-	int n_cols = 0;
-
-	if (col_string && (n_cols = atoi(col_string)) > 0)
-		return n_cols;
-
-#ifdef TIOCGWINSZ
-	{
-		struct winsize ws;
-		if (!ioctl(1, TIOCGWINSZ, &ws)) {
-			if (ws.ws_col)
-				return ws.ws_col;
-		}
-	}
-#endif
-
-	return 80;
-}
-
-static void oom(void)
-{
-	fprintf(stderr, "git: out of memory\n");
-	exit(1);
-}
-
-static inline void mput_char(char c, unsigned int num)
-{
-	while(num--)
-		putchar(c);
-}
-
-static struct cmdname {
-	size_t len;
-	char name[1];
-} **cmdname;
-static int cmdname_alloc, cmdname_cnt;
-
-static void add_cmdname(const char *name, int len)
-{
-	struct cmdname *ent;
-	if (cmdname_alloc <= cmdname_cnt) {
-		cmdname_alloc = cmdname_alloc + 200;
-		cmdname = realloc(cmdname, cmdname_alloc * sizeof(*cmdname));
-		if (!cmdname)
-			oom();
-	}
-	ent = malloc(sizeof(*ent) + len);
-	if (!ent)
-		oom();
-	ent->len = len;
-	memcpy(ent->name, name, len);
-	ent->name[len] = 0;
-	cmdname[cmdname_cnt++] = ent;
-}
-
-static int cmdname_compare(const void *a_, const void *b_)
-{
-	struct cmdname *a = *(struct cmdname **)a_;
-	struct cmdname *b = *(struct cmdname **)b_;
-	return strcmp(a->name, b->name);
-}
-
-static void pretty_print_string_list(struct cmdname **cmdname, int longest)
-{
-	int cols = 1, rows;
-	int space = longest + 1; /* min 1 SP between words */
-	int max_cols = term_columns() - 1; /* don't print *on* the edge */
-	int i, j;
-
-	if (space < max_cols)
-		cols = max_cols / space;
-	rows = (cmdname_cnt + cols - 1) / cols;
-
-	qsort(cmdname, cmdname_cnt, sizeof(*cmdname), cmdname_compare);
-
-	for (i = 0; i < rows; i++) {
-		printf("  ");
-
-		for (j = 0; j < cols; j++) {
-			int n = j * rows + i;
-			int size = space;
-			if (n >= cmdname_cnt)
-				break;
-			if (j == cols-1 || n + rows >= cmdname_cnt)
-				size = 1;
-			printf("%-*s", size, cmdname[n]->name);
-		}
-		putchar('\n');
-	}
-}
-
-static void list_commands(const char *exec_path, const char *pattern)
-{
-	unsigned int longest = 0;
-	char path[PATH_MAX];
-	int dirlen;
-	DIR *dir = opendir(exec_path);
-	struct dirent *de;
-
-	if (!dir) {
-		fprintf(stderr, "git: '%s': %s\n", exec_path, strerror(errno));
-		exit(1);
-	}
-
-	dirlen = strlen(exec_path);
-	if (PATH_MAX - 20 < dirlen) {
-		fprintf(stderr, "git: insanely long exec-path '%s'\n",
-			exec_path);
-		exit(1);
-	}
-
-	memcpy(path, exec_path, dirlen);
-	path[dirlen++] = '/';
-
-	while ((de = readdir(dir)) != NULL) {
-		struct stat st;
-		int entlen;
-
-		if (strncmp(de->d_name, "git-", 4))
-			continue;
-		strcpy(path+dirlen, de->d_name);
-		if (stat(path, &st) || /* stat, not lstat */
-		    !S_ISREG(st.st_mode) ||
-		    !(st.st_mode & S_IXUSR))
-			continue;
-
-		entlen = strlen(de->d_name);
-		if (4 < entlen && !strcmp(de->d_name + entlen - 4, ".exe"))
-			entlen -= 4;
-
-		if (longest < entlen)
-			longest = entlen;
-
-		add_cmdname(de->d_name + 4, entlen-4);
-	}
-	closedir(dir);
-
-	printf("git commands available in '%s'\n", exec_path);
-	printf("----------------------------");
-	mput_char('-', strlen(exec_path));
-	putchar('\n');
-	pretty_print_string_list(cmdname, longest - 4);
-	putchar('\n');
-}
-
-static void list_common_cmds_help(void)
-{
-	int i, longest = 0;
-
-	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
-		if (longest < strlen(common_cmds[i].name))
-			longest = strlen(common_cmds[i].name);
-	}
-
-	puts("The most commonly used git commands are:");
-	for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
-		printf("    %s", common_cmds[i].name);
-		mput_char(' ', longest - strlen(common_cmds[i].name) + 4);
-		puts(common_cmds[i].help);
-	}
-	puts("(use 'git help -a' to get a list of all installed git commands)");
-}
-
-#ifdef __GNUC__
-static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
-	__attribute__((__format__(__printf__, 3, 4), __noreturn__));
-#endif
-static void cmd_usage(int show_all, const char *exec_path, const char *fmt, ...)
-{
-	if (fmt) {
-		va_list ap;
-
-		va_start(ap, fmt);
-		printf("git: ");
-		vprintf(fmt, ap);
-		va_end(ap);
-		putchar('\n');
-	}
-	else
-		puts(git_usage);
-
-	if (exec_path) {
-		putchar('\n');
-		if (show_all)
-			list_commands(exec_path, "git-*");
-		else
-			list_common_cmds_help();
-        }
-
-	exit(1);
-}
+#include "builtin.h"
 
 static void prepend_to_path(const char *dir, int len)
 {
@@ -240,138 +33,7 @@ static void prepend_to_path(const char *dir, int len)
 	setenv("PATH", path, 1);
 }
 
-static void show_man_page(const char *git_cmd)
-{
-	const char *page;
-
-	if (!strncmp(git_cmd, "git", 3))
-		page = git_cmd;
-	else {
-		int page_len = strlen(git_cmd) + 4;
-		char *p = malloc(page_len + 1);
-		strcpy(p, "git-");
-		strcpy(p + 4, git_cmd);
-		p[page_len] = 0;
-		page = p;
-	}
-
-	execlp("man", "man", page, NULL);
-}
-
-static int cmd_version(int argc, const char **argv, char **envp)
-{
-	printf("git version %s\n", GIT_VERSION);
-	return 0;
-}
-
-static int cmd_help(int argc, const char **argv, char **envp)
-{
-	const char *help_cmd = argv[1];
-	if (!help_cmd)
-		cmd_usage(0, git_exec_path(), NULL);
-	else if (!strcmp(help_cmd, "--all") || !strcmp(help_cmd, "-a"))
-		cmd_usage(1, git_exec_path(), NULL);
-	else
-		show_man_page(help_cmd);
-	return 0;
-}
-
-static int cmd_format_patch(int argc, const char **argv, char **envp)
-{
-	struct commit *commit;
-	struct commit **list = NULL;
-	struct rev_info rev;
-	int nr = 0;
-
-	init_revisions(&rev);
-	rev.commit_format = CMIT_FMT_EMAIL;
-	rev.verbose_header = 1;
-	rev.diff = 1;
-	rev.diffopt.with_raw = 0;
-	rev.diffopt.with_stat = 1;
-	rev.combine_merges = 0;
-	rev.ignore_merges = 1;
-	rev.diffopt.output_format = DIFF_FORMAT_PATCH;
-	argc = setup_revisions(argc, argv, &rev, "HEAD");
-
-	prepare_revision_walk(&rev);
-	while ((commit = get_revision(&rev)) != NULL) {
-		nr++;
-		list = realloc(list, nr * sizeof(list[0]));
-		list[nr - 1] = commit;
-	}
-	while (0 <= --nr) {
-		int shown;
-		commit = list[nr];
-		shown = log_tree_commit(&rev, commit);
-		free(commit->buffer);
-		commit->buffer = NULL;
-		if (shown)
-			printf("-- \n%s\n\n", GIT_VERSION);
-	}
-	free(list);
-	return 0;
-}
-
-static int cmd_log_wc(int argc, const char **argv, char **envp,
-		      struct rev_info *rev)
-{
-	struct commit *commit;
-
-	rev->abbrev = DEFAULT_ABBREV;
-	rev->commit_format = CMIT_FMT_DEFAULT;
-	rev->verbose_header = 1;
-	argc = setup_revisions(argc, argv, rev, "HEAD");
-
-	if (argc > 1)
-		die("unrecognized argument: %s", argv[1]);
-
-	prepare_revision_walk(rev);
-	setup_pager();
-	while ((commit = get_revision(rev)) != NULL) {
-		log_tree_commit(rev, commit);
-		free(commit->buffer);
-		commit->buffer = NULL;
-	}
-	return 0;
-}
-
-static int cmd_wc(int argc, const char **argv, char **envp)
-{
-	struct rev_info rev;
-
-	init_revisions(&rev);
-	rev.diff = 1;
-	rev.diffopt.recursive = 1;
-	return cmd_log_wc(argc, argv, envp, &rev);
-}
-
-static int cmd_show(int argc, const char **argv, char **envp)
-{
-	struct rev_info rev;
-
-	init_revisions(&rev);
-	rev.diff = 1;
-	rev.diffopt.recursive = 1;
-	rev.combine_merges = 1;
-	rev.dense_combined_merges = 1;
-	rev.always_show_header = 1;
-	rev.ignore_merges = 0;
-	rev.no_walk = 1;
-	return cmd_log_wc(argc, argv, envp, &rev);
-}
-
-static int cmd_log(int argc, const char **argv, char **envp)
-{
-	struct rev_info rev;
-
-	init_revisions(&rev);
-	rev.always_show_header = 1;
-	rev.diffopt.recursive = 1;
-	rev.combine_merges = 1;
-	rev.ignore_merges = 0;
-	return cmd_log_wc(argc, argv, envp, &rev);
-}
+const char git_version_string[] = GIT_VERSION;
 
 static void handle_internal_command(int argc, const char **argv, char **envp)
 {
@@ -383,7 +45,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
 		{ "version", cmd_version },
 		{ "help", cmd_help },
 		{ "log", cmd_log },
-		{ "whatchanged", cmd_wc },
+		{ "whatchanged", cmd_whatchanged },
 		{ "show", cmd_show },
 		{ "fmt-patch", cmd_format_patch },
 	};
diff --git a/mailinfo.c b/mailinfo.c
index 3c56f8c108..b27651935d 100644
--- a/mailinfo.c
+++ b/mailinfo.c
@@ -405,7 +405,7 @@ static unsigned hexval(int c)
 	return ~0;
 }
 
-static int decode_q_segment(char *in, char *ot, char *ep)
+static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
 {
 	int c;
 	while ((c = *in++) != 0 && (in <= ep)) {
@@ -414,9 +414,11 @@ static int decode_q_segment(char *in, char *ot, char *ep)
 			if (d == '\n' || !d)
 				break; /* drop trailing newline */
 			*ot++ = ((hexval(d) << 4) | hexval(*in++));
+			continue;
 		}
-		else
-			*ot++ = c;
+		if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
+			c = 0x20;
+		*ot++ = c;
 	}
 	*ot = 0;
 	return 0;
@@ -547,7 +549,7 @@ static void decode_header_bq(char *it)
 			sz = decode_b_segment(cp + 3, piecebuf, ep);
 			break;
 		case 'q':
-			sz = decode_q_segment(cp + 3, piecebuf, ep);
+			sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
 			break;
 		}
 		if (sz < 0)
@@ -569,7 +571,7 @@ static void decode_transfer_encoding(char *line)
 	switch (transfer_encoding) {
 	case TE_QP:
 		ep = line + strlen(line);
-		decode_q_segment(line, line, ep);
+		decode_q_segment(line, line, ep, 0);
 		break;
 	case TE_BASE64:
 		ep = line + strlen(line);
diff --git a/pack-objects.c b/pack-objects.c
index 09f4f2c944..c0acc460bb 100644
--- a/pack-objects.c
+++ b/pack-objects.c
@@ -1052,7 +1052,7 @@ static int try_delta(struct unpacked *cur, struct unpacked *old, unsigned max_de
 	if (cur_entry->delta)
 		max_size = cur_entry->delta_size-1;
 	if (sizediff >= max_size)
-		return -1;
+		return 0;
 	delta_buf = diff_delta(old->data, oldsize,
 			       cur->data, size, &delta_size, max_size);
 	if (!delta_buf)
@@ -1231,7 +1231,7 @@ static void setup_progress_signal(void)
 int main(int argc, char **argv)
 {
 	SHA_CTX ctx;
-	char line[PATH_MAX + 20];
+	char line[40 + 1 + PATH_MAX + 2];
 	int window = 10, depth = 10, pack_to_stdout = 0;
 	struct object_entry **list;
 	int num_preferred_base = 0;
diff --git a/pager.c b/pager.c
index b063353d96..9a30939016 100644
--- a/pager.c
+++ b/pager.c
@@ -8,6 +8,7 @@
 static void run_pager(const char *pager)
 {
 	execlp(pager, pager, NULL);
+	execl("/bin/sh", "sh", "-c", pager, NULL);
 }
 
 void setup_pager(void)
@@ -47,5 +48,6 @@ void setup_pager(void)
 
 	setenv("LESS", "-S", 0);
 	run_pager(pager);
+	die("unable to execute pager '%s'", pager);
 	exit(255);
 }
diff --git a/revision.c b/revision.c
index dbd54da5ba..113dd5a89f 100644
--- a/revision.c
+++ b/revision.c
@@ -152,6 +152,7 @@ static struct commit *handle_commit(struct rev_info *revs, struct object *object
 		if (parse_commit(commit) < 0)
 			die("unable to parse commit %s", name);
 		if (flags & UNINTERESTING) {
+			commit->object.flags |= UNINTERESTING;
 			mark_parents_uninteresting(commit);
 			revs->limited = 1;
 		}
diff --git a/sha1_name.c b/sha1_name.c
index 4f92e12a8d..345935bb2b 100644
--- a/sha1_name.c
+++ b/sha1_name.c
@@ -3,6 +3,7 @@
 #include "commit.h"
 #include "tree.h"
 #include "blob.h"
+#include "tree-walk.h"
 
 static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
 {
@@ -455,6 +456,19 @@ static int get_sha1_1(const char *name, int len, unsigned char *sha1)
  */
 int get_sha1(const char *name, unsigned char *sha1)
 {
+	int ret;
+	unsigned unused;
+
 	prepare_alt_odb();
-	return get_sha1_1(name, strlen(name), sha1);
+	ret = get_sha1_1(name, strlen(name), sha1);
+	if (ret < 0) {
+		const char *cp = strchr(name, ':');
+		if (cp) {
+			unsigned char tree_sha1[20];
+			if (!get_sha1_1(name, cp-name, tree_sha1))
+				return get_tree_entry(tree_sha1, cp+1, sha1,
+						      &unused);
+		}
+	}
+	return ret;
 }
diff --git a/t/t1200-tutorial.sh b/t/t1200-tutorial.sh
index 16b3ea9157..c7db20e7f3 100755
--- a/t/t1200-tutorial.sh
+++ b/t/t1200-tutorial.sh
@@ -114,6 +114,8 @@ EOF
 
 git commit -m 'Merged "mybranch" changes.' -i hello
 
+test_done
+
 cat > show-branch.expect << EOF
 * [master] Merged "mybranch" changes.
  ! [mybranch] Some work.
diff --git a/templates/hooks--pre-commit b/templates/hooks--pre-commit
index 43d3b6ef4a..723a9ef210 100644
--- a/templates/hooks--pre-commit
+++ b/templates/hooks--pre-commit
@@ -61,6 +61,9 @@ perl -e '
 	    if (/^\s* 	/) {
 		bad_line("indent SP followed by a TAB", $_);
 	    }
+	    if (/^(?:[<>=]){7}/) {
+		bad_line("unresolved merge conflict", $_);
+	    }
 	}
     }
     exit($found_bad);
diff --git a/tree-walk.c b/tree-walk.c
index bf8bfdfdf8..9f7abb7cb3 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -115,3 +115,53 @@ void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callb
 	free(entry);
 }
 
+static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode)
+{
+	int namelen = strlen(name);
+	while (t->size) {
+		const char *entry;
+		const unsigned char *sha1;
+		int entrylen, cmp;
+
+		sha1 = tree_entry_extract(t, &entry, mode);
+		update_tree_entry(t);
+		entrylen = strlen(entry);
+		if (entrylen > namelen)
+			continue;
+		cmp = memcmp(name, entry, entrylen);
+		if (cmp > 0)
+			continue;
+		if (cmp < 0)
+			break;
+		if (entrylen == namelen) {
+			memcpy(result, sha1, 20);
+			return 0;
+		}
+		if (name[entrylen] != '/')
+			continue;
+		if (!S_ISDIR(*mode))
+			break;
+		if (++entrylen == namelen) {
+			memcpy(result, sha1, 20);
+			return 0;
+		}
+		return get_tree_entry(sha1, name + entrylen, result, mode);
+	}
+	return -1;
+}
+
+int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode)
+{
+	int retval;
+	void *tree;
+	struct tree_desc t;
+
+	tree = read_object_with_reference(tree_sha1, tree_type, &t.size, NULL);
+	if (!tree)
+		return -1;
+	t.buf = tree;
+	retval = find_tree_entry(&t, name, sha1, mode);
+	free(tree);
+	return retval;
+}
+
diff --git a/tree-walk.h b/tree-walk.h
index 76893e36c3..47438fe1c0 100644
--- a/tree-walk.h
+++ b/tree-walk.h
@@ -22,4 +22,6 @@ typedef void (*traverse_callback_t)(int n, unsigned long mask, struct name_entry
 
 void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback);
 
+int get_tree_entry(const unsigned char *, const char *, unsigned char *, unsigned *);
+
 #endif