Commit Graph

148 Commits

Author SHA1 Message Date
Junio C Hamano
8ac069ac0a Introduce GIT_DIR environment variable.
During the mailing list discussion on renaming GIT_ environment
variables, people felt that having one environment that lets the
user (or Porcelain) specify both SHA1_FILE_DIRECTORY (now
GIT_OBJECT_DIRECTORY) and GIT_INDEX_FILE for the default layout
would be handy.  This change introduces GIT_DIR environment
variable, from which the defaults for GIT_INDEX_FILE and
GIT_OBJECT_DIRECTORY are derived.  When GIT_DIR is not defined,
it defaults to ".git".  GIT_INDEX_FILE defaults to
"$GIT_DIR/index" and GIT_OBJECT_DIRECTORY defaults to
"$GIT_DIR/objects".

Special thanks for ideas and discussions go to Petr Baudis and
Daniel Barkalow.  Bugs are mine ;-)

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-05-09 22:57:58 -07:00
Junio C Hamano
d19938ab60 Rename environment variables.
H. Peter Anvin mentioned that using SHA1_whatever as an
environment variable name is not nice and we should instead use
names starting with "GIT_" prefix to avoid conflicts.  Here is
what this patch does:

 * Renames the following environment variables:

    New name                           Old Name

    GIT_AUTHOR_DATE                    AUTHOR_DATE
    GIT_AUTHOR_EMAIL                   AUTHOR_EMAIL
    GIT_AUTHOR_NAME                    AUTHOR_NAME
    GIT_COMMITTER_EMAIL                COMMIT_AUTHOR_EMAIL
    GIT_COMMITTER_NAME                 COMMIT_AUTHOR_NAME
    GIT_ALTERNATE_OBJECT_DIRECTORIES   SHA1_FILE_DIRECTORIES
    GIT_OBJECT_DIRECTORY               SHA1_FILE_DIRECTORY

 * Introduces a compatibility macro, gitenv(), which does an
   getenv() and if it fails calls gitenv_bc(), which in turn
   picks up the value from old name while giving a warning about
   using an old name.

 * Changes all users of the environment variable to fetch
   environment variable with the new name using gitenv().

 * Updates the documentation and scripts shipped with Linus GIT
   distribution.

The transition plan is as follows:

 * We will keep the backward compatibility list used by gitenv()
   for now, so the current scripts and user environments
   continue to work as before.  The users will get warnings when
   they have old name but not new name in their environment to
   the stderr.

 * The Porcelain layers should start using new names.  However,
   just in case it ends up calling old Plumbing layer
   implementation, they should also export old names, taking
   values from the corresponding new names, during the
   transition period.

 * After a transition period, we would drop the compatibility
   support and drop gitenv().  Revert the callers to directly
   call getenv() but keep using the new names.

   The last part is probably optional and the transition
   duration needs to be set to a reasonable value.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-05-09 17:57:56 -07:00
Junio C Hamano
192268c197 Add git-update-cache --replace option.
When "path" exists as a file or a symlink in the index, an
attempt to add "path/file" is refused because it results in file
vs directory conflict.  Similarly when "path/file1",
"path/file2", etc. exist, an attempt to add "path" as a file or
a symlink is refused.  With git-update-cache --replace, these
existing entries that conflict with the entry being added are
automatically removed from the cache, with warning messages.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-05-07 21:55:21 -07:00
Junio C Hamano
ace1534d6f Introduce SHA1_FILE_DIRECTORIES to support multiple object databases.
SHA1_FILE_DIRECTORIES environment variable is a colon separated paths
used when looking for SHA1 files not found in the usual place for
reading.  Creating a new SHA1 file does not use this alternate object
database location mechanism.  This is useful to archive older, rarely
used objects into separate directories.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-05-07 00:38:04 -07:00
Junio C Hamano
bf60144c0a [PATCH] Remove unused sha1_file_directory variable.
Now all the users have gone.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-06 17:02:24 -07:00
Linus Torvalds
ee267527aa Revert bogus optimization that avoids index file writes
It didn't properly mark all cache updates as being dirty, and
causes merge errors due to that. In particular, it didn't notice
when a file was force-removed.

Besides, it was ugly as hell. I've put in place a slightly cleaner
version, but I've not enabled the optimization because I don't
want to be burned again.
2005-05-06 16:48:43 -07:00
Linus Torvalds
f80cd783c6 date.c: add "show_date()" function.
Kind of like ctime(), but not as broken.
2005-05-06 15:28:59 -07:00
Linus Torvalds
db823d4a5a Fix symlink handling
We really always want to have S_IFREG there for non-symlinks,
otherwise we create corrupt index files.
2005-05-05 16:01:46 -07:00
Kay Sievers
8ae0a8c514 [PATCH] git and symlinks as tracked content
Allow to store and track symlink in the repository. A symlink is stored
the same way as a regular file, only with the appropriate mode bits set.
The symlink target is therefore stored in a blob object.
This will hopefully make our udev repository fully functional. :)

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-05-05 08:23:01 -07:00
Linus Torvalds
aac1794132 Improve sha1 object file writing.
Make it much safer: we write to a temporary file, and then link that
temporary file to the final destination. This avoids all the nasty
races if several people write the same object at the same time.

It should also result in nicer on-disk layout, since it means that
objects all get created in the same subdirectory. That makes a lot
of block allocation algorithms happier, since the objects will now
be allocated from the same zone.
2005-05-03 11:46:16 -07:00
Junio C Hamano
74400e7175 Add git-write-blob.
A new command, git-write-blob, is introduced.  This registers
the contents of any file on the filesystem as a blob in the
object database and reports its SHA1 to the standard output.
To implement it, the patch promotes index_fd() from a static
function in update-cache.c to extern and moves it to a library
source, sha1_file.c.

This command is used to update git-merge-one-file-script so that
it does not smudge the work tree.

Signed-off-by: Junio C Hamano <junkio@cox.net>
2005-05-01 23:45:49 -07:00
Linus Torvalds
3c249c9506 Add "get_sha1()" helper function.
This allows the programs to use various simplified versions of
the SHA1 names, eg just say "HEAD" for the SHA1 pointed to by
the .git/HEAD file etc.

For example, this commit has been done with

	git-commit-tree $(git-write-tree) -p HEAD

instead of the traditional "$(cat .git/HEAD)" syntax.
2005-05-01 16:36:56 -07:00
Edgar Toernig
b682969367 [PATCH] compat: missing dirent.d_type field
Not everybody has "d_type".
2005-04-30 09:51:03 -07:00
Edgar Toernig
9da3acfb19 [PATCH] compat: support pre-1.2 zlib
Older zlib's don't have deflateBound()
2005-04-30 09:51:03 -07:00
Edgar Toernig
ecee9d9e79 [PATCH] Do date parsing by hand...
...since everything out there is either strange (libc mktime has issues
with timezones) or introduces unnecessary dependencies for people (libcurl).

This goes back to the old date parsing, but moves it out into a file of
its own, and does the "struct tm" to "seconds since epoch" handling by
hand. 

I grepped through the tz-database and it seems there's one "country"
left that has non-60-minute DST: Lord Howe Island.  All others dropped
that before 1970.
2005-04-30 09:46:49 -07:00
Junio C Hamano
40469ee9c6 [PATCH] Rename and extend read_tree_with_tree_or_commit_sha1
This patch renames read_tree_with_tree_or_commit_sha1() to
read_object_with_reference() and extends it to automatically
dereference not just "commit" objects but "tag" objects.  With
this patch, you can say e.g.:

    ls-tree $tag
    read-tree -m $(merge-base $tag $HEAD) $tag $HEAD
    diff-cache $tag
    diff-tree $tag $HEAD

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-28 16:42:27 -07:00
Christopher Li
812666c8e6 [PATCH] introduce xmalloc and xrealloc
Introduce xmalloc and xrealloc to die gracefully with a descriptive
message when out of memory, rather than taking a SIGSEGV. 

Signed-off-by: Christopher Li<chrislgit@chrisli.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-26 12:00:58 -07:00
Linus Torvalds
f5b913c9cb Fix up the types in write_sha1_file
Use "unsigned long" for the size, like we do everywhere else.
2005-04-25 12:04:55 -07:00
Linus Torvalds
a44c9a5e2e Simplify "write_sha1_file()" interfaces
The write function now adds the header to the file by itself, so there
is no reason to duplicate it among all the users any more.
2005-04-25 10:19:53 -07:00
Daniel Barkalow
8237b1854c [PATCH] Additional functions for the objects database
This adds two functions: one to check if an object is present in the local
database, and one to add an object to the local database by reading it
from a file descriptor and checking its hash.

Signed-Off-By: Daniel Barkalow <barkalow@iabervon.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-23 18:47:23 -07:00
Linus Torvalds
b5af910727 New "diff-cache" implementation.
This one is about a million times simpler, and much more likely to be
correct too.

Instead of trying to match up a tree object against the index, we just
read in the tree object side-by-side into the index, and just walk the
resulting index file. This was what all the read-tree cleanups were
all getting to.
2005-04-22 17:15:28 -07:00
Linus Torvalds
94537c78a8 Move "read_tree()" to "tree.c" to be used as a generic helper function.
Next step: make "diff-cache" use it.
2005-04-22 16:42:37 -07:00
Linus Torvalds
cef661fc79 Add support for alternate SHA1 library implementations.
This one includes the Mozilla SHA1 implementation sent in by Edgar Toernig.
It's dual-licenced under MPL-1.1 or GPL, so in the context of git, we
obviously use the GPL version. 

Side note: the Mozilla SHA1 implementation is about twice as fast as the
default openssl one on my G5, but the default openssl one has optimized
x86 assembly language on x86. So choose wisely.
2005-04-21 12:33:22 -07:00
Linus Torvalds
bb233d690a Add support for a "GIT_INDEX_FILE" environment variable.
We use that to specify alternative index files, which can be useful
if you want to (for example) generate a temporary index file to do
some specific operation that you don't want to mess with your main
one with.

It defaults to the regular ".git/index" if it hasn't been specified.
2005-04-21 10:55:18 -07:00
Junio C Hamano
f4913f91a9 [PATCH] Accept commit in some places when tree is needed.
This patch implements read_tree_with_tree_or_commit_sha1(),
which can be used when you are interested in reading an unpacked
raw tree data but you do not know nor care if the SHA1 you
obtained your user is a tree ID or a commit ID.  Before this
function's introduction, you would have called read_sha1_file(),
examined its type, parsed it to call read_sha1_file() again if
it is a commit, and verified that the resulting object is a
tree.  Instead, this function does that for you.  It returns
NULL if the given SHA1 is not either a tree or a commit.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-20 18:06:49 -07:00
Linus Torvalds
2dee060968 Improve build: add <unistd.h> and use -O2 instead of -O3
(Nobody should use -O3. It just makes bad inlining decisions).
2005-04-20 13:00:08 -07:00
Linus Torvalds
ca9be05421 Make the sha1 of the index file go at the very end of the file.
This allows us to both calculate it and verify it faster.
2005-04-20 12:36:41 -07:00
Linus Torvalds
d98b46f8d9 Do SHA1 hash _before_ compression.
And add a "convert-cache" program to convert from old-style
to new-style.
2005-04-20 01:10:46 -07:00
Linus Torvalds
e44794706e Be much more liberal about the file mode bits.
We only really care about the difference between a file being executable
or not (by its owner). Everything else we leave for the user umask to
decide.
2005-04-16 22:26:31 -07:00
Junio C Hamano
aee461985f [PATCH] Add --stage to show-files for new stage dircache.
This adds --stage option to show-files command.  It shows
file-mode, SHA1, stage and pathname.  Record separator follows
the usual convention of -z option as before.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-16 08:33:23 -07:00
Junio C Hamano
fcf712e60e [PATCH] Byteorder fix for read-tree, new -m semantics version.
The ce_namelen field has been renamed to ce_flags and split into
the top 2-bit unused, next 2-bit stage number and the lowest
12-bit name-length, stored in the network byte order.  A new
macro create_ce_flags() is defined to synthesize this value from
length and stage, but it forgets to turn the value into the
network byte order.  Here is a fix.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-04-16 08:30:20 -07:00
Linus Torvalds
95fd5bf82a Make cache entry comparison take the new "state" flag into account.
This is what allows us to have multiple states of the same file in
the index, and what makes it always sort correctly.
2005-04-15 22:51:44 -07:00
Linus Torvalds
f5cabd13d8 Encode a few extra flags per index entry.
This will allow us to have the same name in different "states" in the
index at the same time. Which in turn seems to be a very simple way to
merge.
2005-04-15 21:45:38 -07:00
Linus Torvalds
ccc4feb579 Convert the index file reading/writing to use network byte order.
This allows using a git tree over NFS with different byte order, and
makes it possible to just copy a fully populated repository and have
the end result immediately usable (needing just a refresh to update
the stat information).
2005-04-15 10:44:27 -07:00
Petr Baudis
2de381f919 [PATCH] Consolidate the error handling
Now there is error() for "library" errors and die() for fatal "application"
errors. usage() is now used strictly only for usage errors.

Signed-off-by: Petr Baudis <pasky@ucw.cz>
2005-04-13 02:28:48 -07:00
Linus Torvalds
4bb04f2190 Rename ".dircache" directory to ".git"
I started out calling the tool "dircache". That's clearly moronic.
2005-04-11 15:47:57 -07:00
Linus Torvalds
73134b6d3f Add "-R" flag to "diff-tree", so that it will recursively traverse a tree of trees
as it diffs them.

This makes diff-tree usable again in the new world order.
2005-04-10 14:03:58 -07:00
Linus Torvalds
121481abf8 Make "update-cache" a bit friendlier to use (and harder to mis-use).
It now requires the "--add" flag before you add any new files, and
a "--remove" file if you want to mark files for removal. And giving
it the "--refresh" flag makes it just update all the files that it
already knows about.
2005-04-10 11:32:54 -07:00
Linus Torvalds
d6d3f9d012 This implements the new "recursive tree" write-tree.
It's got some debugging printouts etc still in it, but testing on the
kernel seems to show that it does indeed fix the issue with huge tree
files for each commit.
2005-04-09 17:09:34 -07:00
Linus Torvalds
79517a067a Export "cache_name_compare()" helper function.
The "diff-tree" program needs it.
2005-04-09 12:59:11 -07:00
Linus Torvalds
197ee8c970 Make "write_cache()" and friends available as generic routines.
This is needed for the change to make "read-tree" just read into the
cache (and then you do a "checkout-cache" to update your current dir
contents).
2005-04-09 12:09:27 -07:00
Linus Torvalds
734aab758c Make the cache stat information comparator public.
Like the cache filename finder, it's a generically useful function,
rather than something specific to the current "show-diff" thing.
2005-04-09 09:48:20 -07:00
Linus Torvalds
eb38c22f53 Make "cache_name_pos()" available to others.
It finds the cache entry position for a given name, and is
generally useful. Sure, everybody can just scan the active
cache array, but since it's sorted, you actually want to
search it with a binary search, so let's not duplicate that
logic all over the place.
2005-04-09 09:26:55 -07:00
Linus Torvalds
59c1e24980 Fix missing return values and some error tests for empty index files
Patches from Dave Jones and Ingo Molnar, but since I don't have any
infrastructure in place to use the old patch applicator scripts I
am trying to build up, I ended up fixing the thing by hand instead.

Credit where credit is due, though. Nice to see that people are
taking a look at the project even in this early stage.
2005-04-09 00:25:22 -07:00
Linus Torvalds
2ade934026 Add "check_sha1_signature()" helper function
And fix up header declarations.
2005-04-08 15:01:15 -07:00
Linus Torvalds
24778e335a Factor out "read_sha1_file" into mapping/inflating/unmapping.
This allows us to also actually check the sha1 hash using these
routines. Needed for the "fsck" thing.
2005-04-08 14:42:29 -07:00
Linus Torvalds
bf0c6e839c Make "cat-file" output the file contents to stdout.
New syntax: "cat-file -t <sha1>" shows the tag, while "cat-file <tag> <sha1>"
outputs the file contents after checking that the supplied tag matches.
2005-04-08 09:16:38 -07:00
Linus Torvalds
e83c516331 Initial revision of "git", the information manager from hell 2005-04-07 15:13:13 -07:00