a3437b8c26
This patch linearises the GIT commit history graph into merge order
which is defined by invariants specified in Documentation/git-rev-list.txt.
The linearisation produced by this patch is superior in an objective sense
to that produced by the existing git-rev-list implementation in that
the linearisation produced is guaranteed to have the minimum number of
discontinuities, where a discontinuity is defined as an adjacent pair of
commits in the output list which are not related in a direct child-parent
relationship.
With this patch a graph like this:
a4 ---
| \ \
| b4 |
|/ | |
a3 | |
| | |
a2 | |
| | c3
| | |
| | c2
| b3 |
| | /|
| b2 |
| | c1
| | /
| b1
a1 |
| |
a0 |
| /
root
Sorts like this:
= a4
| c3
| c2
| c1
^ b4
| b3
| b2
| b1
^ a3
| a2
| a1
| a0
= root
Instead of this:
= a4
| c3
^ b4
| a3
^ c2
^ b3
^ a2
^ b2
^ c1
^ a1
^ b1
^ a0
= root
A test script, t/t6000-rev-list.sh, includes a test which demonstrates
that the linearisation produced by --merge-order has less discontinuities
than the linearisation produced by git-rev-list without the --merge-order
flag specified. To see this, do the following:
cd t
./t6000-rev-list.sh
cd trash
cat actual-default-order
cat actual-merge-order
The existing behaviour of git-rev-list is preserved, by default. To obtain
the modified behaviour, specify --merge-order or --merge-order --show-breaks
on the command line.
This version of the patch has been tested on the git repository and also on the linux-2.6
repository and has reasonable performance on both - ~50-100% slower than the original algorithm.
This version of the patch has incorporated a functional equivalent of the Linus' output limiting
algorithm into the merge-order algorithm itself. This operates per the notes associated
with Linus' commit 337cb3fb8d.
This version has incorporated Linus' feedback regarding proposed changes to rev-list.c.
(see: [PATCH] Factor out filtering in rev-list.c)
This version has improved the way sort_first_epoch marks commits as uninteresting.
For more details about this change, refer to Documentation/git-rev-list.txt
and http://blackcubes.dyndns.org/epoch/.
Signed-off-by: Jon Seymour <jon.seymour@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
149 lines
4.1 KiB
Makefile
149 lines
4.1 KiB
Makefile
# -DCOLLISION_CHECK if you believe that SHA1's
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# 1461501637330902918203684832716283019655932542976 hashes do not give you
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# enough guarantees about no collisions between objects ever hapenning.
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#
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# -DUSE_NSEC if you want git to care about sub-second file mtimes and ctimes.
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# -DUSE_STDEV if you want git to care about st_dev changing
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#
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# Note that you need some new glibc (at least >2.2.4) for this, and it will
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# BREAK YOUR LOCAL DIFFS! show-diff and anything using it will likely randomly
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# break unless your underlying filesystem supports those sub-second times
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# (my ext3 doesn't).
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COPTS=-O2
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CFLAGS=-g $(COPTS) -Wall
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prefix=$(HOME)
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bin=$(prefix)/bin
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# dest=
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CC=gcc
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AR=ar
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INSTALL=install
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SCRIPTS=git git-apply-patch-script git-merge-one-file-script git-prune-script \
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git-pull-script git-tag-script git-resolve-script git-whatchanged \
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git-deltafy-script git-fetch-script git-status-script git-commit-script \
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git-log-script git-shortlog
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PROG= git-update-cache git-diff-files git-init-db git-write-tree \
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git-read-tree git-commit-tree git-cat-file git-fsck-cache \
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git-checkout-cache git-diff-tree git-rev-tree git-ls-files \
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git-check-files git-ls-tree git-merge-base git-merge-cache \
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git-unpack-file git-export git-diff-cache git-convert-cache \
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git-http-pull git-ssh-push git-ssh-pull git-rev-list git-mktag \
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git-diff-helper git-tar-tree git-local-pull git-write-blob \
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git-get-tar-commit-id git-mkdelta git-apply git-stripspace
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all: $(PROG)
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install: $(PROG) $(SCRIPTS)
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$(INSTALL) $(PROG) $(SCRIPTS) $(dest)$(bin)
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LIB_OBJS=read-cache.o sha1_file.o usage.o object.o commit.o tree.o blob.o \
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tag.o delta.o date.o index.o diff-delta.o patch-delta.o entry.o epoch.o
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LIB_FILE=libgit.a
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LIB_H=cache.h object.h blob.h tree.h commit.h tag.h delta.h epoch.h
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LIB_H += strbuf.h
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LIB_OBJS += strbuf.o
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LIB_H += diff.h count-delta.h
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LIB_OBJS += diff.o diffcore-rename.o diffcore-pickaxe.o diffcore-pathspec.o \
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count-delta.o diffcore-break.o diffcore-order.o
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LIB_OBJS += gitenv.o
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LIBS = $(LIB_FILE)
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LIBS += -lz
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ifdef MOZILLA_SHA1
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SHA1_HEADER="mozilla-sha1/sha1.h"
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LIB_OBJS += mozilla-sha1/sha1.o
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else
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ifdef PPC_SHA1
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SHA1_HEADER="ppc/sha1.h"
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LIB_OBJS += ppc/sha1.o ppc/sha1ppc.o
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else
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SHA1_HEADER=<openssl/sha.h>
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LIBS += -lcrypto
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endif
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endif
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CFLAGS += '-DSHA1_HEADER=$(SHA1_HEADER)'
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$(LIB_FILE): $(LIB_OBJS)
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$(AR) rcs $@ $(LIB_OBJS)
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test-date: test-date.c date.o
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$(CC) $(CFLAGS) -o $@ test-date.c date.o
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test-delta: test-delta.c diff-delta.o patch-delta.o
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$(CC) $(CFLAGS) -o $@ $^
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git-%: %.c $(LIB_FILE)
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$(CC) $(CFLAGS) -o $@ $(filter %.c,$^) $(LIBS)
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git-update-cache: update-cache.c
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git-diff-files: diff-files.c
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git-init-db: init-db.c
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git-write-tree: write-tree.c
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git-read-tree: read-tree.c
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git-commit-tree: commit-tree.c
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git-cat-file: cat-file.c
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git-fsck-cache: fsck-cache.c
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git-checkout-cache: checkout-cache.c
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git-diff-tree: diff-tree.c
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git-rev-tree: rev-tree.c
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git-ls-files: ls-files.c
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git-check-files: check-files.c
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git-ls-tree: ls-tree.c
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git-merge-base: merge-base.c
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git-merge-cache: merge-cache.c
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git-unpack-file: unpack-file.c
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git-export: export.c
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git-diff-cache: diff-cache.c
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git-convert-cache: convert-cache.c
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git-http-pull: http-pull.c pull.c
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git-local-pull: local-pull.c pull.c
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git-ssh-push: rsh.c
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git-ssh-pull: rsh.c pull.c
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git-rev-list: rev-list.c
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git-mktag: mktag.c
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git-diff-helper: diff-helper.c
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git-tar-tree: tar-tree.c
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git-write-blob: write-blob.c
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git-mkdelta: mkdelta.c
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git-stripspace: stripspace.c
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git-http-pull: LIBS += -lcurl
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# Library objects..
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blob.o: $(LIB_H)
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tree.o: $(LIB_H)
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commit.o: $(LIB_H)
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tag.o: $(LIB_H)
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object.o: $(LIB_H)
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read-cache.o: $(LIB_H)
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sha1_file.o: $(LIB_H)
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usage.o: $(LIB_H)
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strbuf.o: $(LIB_H)
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gitenv.o: $(LIB_H)
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entry.o: $(LIB_H)
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diff.o: $(LIB_H) diffcore.h
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diffcore-rename.o : $(LIB_H) diffcore.h
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diffcore-pathspec.o : $(LIB_H) diffcore.h
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diffcore-pickaxe.o : $(LIB_H) diffcore.h
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diffcore-break.o : $(LIB_H) diffcore.h
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diffcore-order.o : $(LIB_H) diffcore.h
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epoch.o: $(LIB_H)
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test: all
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$(MAKE) -C t/ all
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clean:
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rm -f *.o mozilla-sha1/*.o ppc/*.o $(PROG) $(LIB_FILE)
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$(MAKE) -C Documentation/ clean
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backup: clean
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cd .. ; tar czvf dircache.tar.gz dir-cache
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