git-commit-vandalism/builtin/reset.c

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/*
* "git reset" builtin command
*
* Copyright (c) 2007 Carlos Rica
*
* Based on git-reset.sh, which is
*
* Copyright (c) 2005, 2006 Linus Torvalds and Junio C Hamano
*/
Fix sparse warnings Fix warnings from 'make check'. - These files don't include 'builtin.h' causing sparse to complain that cmd_* isn't declared: builtin/clone.c:364, builtin/fetch-pack.c:797, builtin/fmt-merge-msg.c:34, builtin/hash-object.c:78, builtin/merge-index.c:69, builtin/merge-recursive.c:22 builtin/merge-tree.c:341, builtin/mktag.c:156, builtin/notes.c:426 builtin/notes.c:822, builtin/pack-redundant.c:596, builtin/pack-refs.c:10, builtin/patch-id.c:60, builtin/patch-id.c:149, builtin/remote.c:1512, builtin/remote-ext.c:240, builtin/remote-fd.c:53, builtin/reset.c:236, builtin/send-pack.c:384, builtin/unpack-file.c:25, builtin/var.c:75 - These files have symbols which should be marked static since they're only file scope: submodule.c:12, diff.c:631, replace_object.c:92, submodule.c:13, submodule.c:14, trace.c:78, transport.c:195, transport-helper.c:79, unpack-trees.c:19, url.c:3, url.c:18, url.c:104, url.c:117, url.c:123, url.c:129, url.c:136, thread-utils.c:21, thread-utils.c:48 - These files redeclare symbols to be different types: builtin/index-pack.c:210, parse-options.c:564, parse-options.c:571, usage.c:49, usage.c:58, usage.c:63, usage.c:72 - These files use a literal integer 0 when they really should use a NULL pointer: daemon.c:663, fast-import.c:2942, imap-send.c:1072, notes-merge.c:362 While we're in the area, clean up some unused #includes in builtin files (mostly exec_cmd.h). Signed-off-by: Stephen Boyd <bebarino@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-03-22 08:51:05 +01:00
#include "builtin.h"
#include "tag.h"
#include "object.h"
#include "commit.h"
#include "run-command.h"
#include "refs.h"
#include "diff.h"
#include "diffcore.h"
#include "tree.h"
#include "branch.h"
#include "parse-options.h"
#include "unpack-trees.h"
#include "cache-tree.h"
static const char * const git_reset_usage[] = {
N_("git reset [--mixed | --soft | --hard | --merge | --keep] [-q] [<commit>]"),
N_("git reset [-q] <tree-ish> [--] <paths>..."),
N_("git reset --patch [<tree-ish>] [--] [<paths>...]"),
NULL
};
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 05:25:57 +01:00
enum reset_type { MIXED, SOFT, HARD, MERGE, KEEP, NONE };
static const char *reset_type_names[] = {
N_("mixed"), N_("soft"), N_("hard"), N_("merge"), N_("keep"), NULL
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 05:25:57 +01:00
};
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 18:30:31 +01:00
static inline int is_merge(void)
{
return !access(git_path("MERGE_HEAD"), F_OK);
}
static int reset_index(const unsigned char *sha1, int reset_type, int quiet)
{
int nr = 1;
struct tree_desc desc[2];
struct tree *tree;
struct unpack_trees_options opts;
memset(&opts, 0, sizeof(opts));
opts.head_idx = 1;
opts.src_index = &the_index;
opts.dst_index = &the_index;
opts.fn = oneway_merge;
opts.merge = 1;
if (!quiet)
opts.verbose_update = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 18:30:31 +01:00
switch (reset_type) {
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 05:25:57 +01:00
case KEEP:
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 18:30:31 +01:00
case MERGE:
opts.update = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 18:30:31 +01:00
break;
case HARD:
opts.update = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 18:30:31 +01:00
/* fallthrough */
default:
opts.reset = 1;
Add 'merge' mode to 'git reset' We have always had a nice way to reset a working tree to another state while carrying our changes around: "git read-tree -u -m". Yes, it fails if the target tree is different in the paths that are dirty in the working tree, but this is how we used to switch branches in "git checkout", and it worked fine. However, perhaps exactly _because_ we've supported this from very early on, another low-level command, namely "git reset", never did. But as time went on, 'git reset' remains as a very common command, while 'git read-tree' is now a very odd and low-level plumbing thing that nobody sane should ever use, because it only makes sense together with other operations like either switching branches or just rewriting HEAD. Which means that we have effectively lost the ability to do something very common: jump to another point in time without always dropping all our dirty state. So add this kind of mode to "git reset", and since it merges your changes to what you are resetting to, just call it that: "git reset --merge". I've wanted this for a long time, since I very commonly carry a dirty tree while working on things. My main 'Makefile' file quite often has the next version already modified, and sometimes I have local modifications that I don't want to commit, but I still do pulls and patch applications, and occasionally want to do "git reset" to undo them - while still keeping my local modifications. (Maybe we could eventually change it to something like "if we have a working tree, default to --merge, otherwise default to --mixed"). NOTE! This new mode is certainly not perfect. There's a few things to look out for: - if the index has unmerged entries, "--merge" will currently simply refuse to reset ("you need to resolve your current index first"). You'll need to use "--hard" or similar in this case. This is sad, because normally a unmerged index means that the working tree file should have matched the source tree, so the correct action is likely to make --merge reset such a path to the target (like --hard), regardless of dirty state in-tree or in-index. But that's not how read-tree has ever worked, so.. - "git checkout -m" actually knows how to do a three-way merge, rather than refuse to update the working tree. So we do know how to do that, and arguably that would be even nicer behavior. At the same time it's also arguably true that there is a chance of loss of state (ie you cannot get back to the original tree if the three-way merge ends up resolving cleanly to no diff at all), so the "refuse to do it" is in some respects the safer - but less user-friendly - option. In other words, I think 'git reset --merge' could become a bit more friendly, but this is already a big improvement. It allows you to undo a recent commit without having to throw your current work away. Yes, yes, with a dirty tree you could always do git stash git reset --hard git stash apply instead, but isn't "git reset --merge" a nice way to handle one particular simple case? Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> -- Hmm? Maybe I'm the only one that does a lot of work with a dirty tree, and sure, I can do other things like the "git stash" thing, or using "git checkout" to actually create a new branch, and then playing games with branch renaming etc to make it work like this one. But I suspect others dislike how "git reset" works too. But see the suggested improvements above. builtin-reset.c | 26 ++++++++++++++++++-------- 1 files changed, 18 insertions(+), 8 deletions(-)
2008-12-01 18:30:31 +01:00
}
read_cache_unmerged();
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 05:25:57 +01:00
if (reset_type == KEEP) {
unsigned char head_sha1[20];
if (get_sha1("HEAD", head_sha1))
return error(_("You do not have a valid HEAD."));
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 05:25:57 +01:00
if (!fill_tree_descriptor(desc, head_sha1))
return error(_("Failed to find tree of HEAD."));
reset: add option "--keep" to "git reset" The purpose of this new option is to discard some of the last commits but to keep current changes in the work tree. The use case is when you work on something and commit that work. And then you work on something else that touches other files, but you don't commit it yet. Then you realize that what you commited when you worked on the first thing is not good or belongs to another branch. So you want to get rid of the previous commits (at least in the current branch) but you want to make sure that you keep the changes you have in the work tree. And you are pretty sure that your changes are independent from what you previously commited, so you don't want the reset to succeed if the previous commits changed a file that you also changed in your work tree. The table below shows what happens when running "git reset --keep target" to reset the HEAD to another commit (as a special case "target" could be the same as HEAD). working index HEAD target working index HEAD ---------------------------------------------------- A B C D --keep (disallowed) A B C C --keep A C C B B C D --keep (disallowed) B B C C --keep B C C In this table, A, B and C are some different states of a file. For example the last line of the table means that if a file is in state B in the working tree and the index, and in a different state C in HEAD and in the target, then "git reset --keep target" will put the file in state B in the working tree, and in state C in the index and in HEAD. The following table shows what happens on unmerged entries: working index HEAD target working index HEAD ---------------------------------------------------- X U A B --keep (disallowed) X U A A --keep X A A In this table X can be any state and U means an unmerged entry. Though the error message when "reset --keep" is disallowed on unmerged entries is something like: error: Entry 'file1' would be overwritten by merge. Cannot merge. fatal: Could not reset index file to revision 'HEAD^'. which is not very nice. A following patch will add some test cases for "--keep". The "--keep" option is implemented by doing a 2 way merge between HEAD and the reset target, and if this succeeds by doing a mixed reset to the target. The code comes from the sequencer GSoC project, where such an option was developed by Stephan Beyer: git://repo.or.cz/git/sbeyer.git (at commit 5a78908b70ceb5a4ea9fd4b82f07ceba1f019079) But in the sequencer project the "reset" flag was set in the "struct unpack_trees_options" passed to "unpack_trees()". With this flag the changes in the working tree were discarded if the file was different between HEAD and the reset target. Mentored-by: Daniel Barkalow <barkalow@iabervon.org> Mentored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 05:25:57 +01:00
nr++;
opts.fn = twoway_merge;
}
if (!fill_tree_descriptor(desc + nr - 1, sha1))
return error(_("Failed to find tree of %s."), sha1_to_hex(sha1));
if (unpack_trees(nr, desc, &opts))
return -1;
if (reset_type == MIXED || reset_type == HARD) {
tree = parse_tree_indirect(sha1);
prime_cache_tree(&active_cache_tree, tree);
}
return 0;
}
static void print_new_head_line(struct commit *commit)
{
const char *hex, *body;
char *msg;
hex = find_unique_abbrev(commit->object.sha1, DEFAULT_ABBREV);
printf(_("HEAD is now at %s"), hex);
msg = logmsg_reencode(commit, NULL, get_log_output_encoding());
body = strstr(msg, "\n\n");
if (body) {
const char *eol;
size_t len;
body += 2;
eol = strchr(body, '\n');
len = eol ? eol - body : strlen(body);
printf(" %.*s\n", (int) len, body);
}
else
printf("\n");
logmsg_free(msg, commit);
}
static void update_index_from_diff(struct diff_queue_struct *q,
struct diff_options *opt, void *data)
{
int i;
for (i = 0; i < q->nr; i++) {
struct diff_filespec *one = q->queue[i]->one;
if (one->mode && !is_null_sha1(one->sha1)) {
struct cache_entry *ce;
ce = make_cache_entry(one->mode, one->sha1, one->path,
0, 0);
if (!ce)
die(_("make_cache_entry failed for path '%s'"),
one->path);
add_cache_entry(ce, ADD_CACHE_OK_TO_ADD |
ADD_CACHE_OK_TO_REPLACE);
} else
remove_file_from_cache(one->path);
}
}
static int read_from_tree(const char **pathspec, unsigned char *tree_sha1)
{
struct diff_options opt;
memset(&opt, 0, sizeof(opt));
diff_tree_setup_paths(pathspec, &opt);
opt.output_format = DIFF_FORMAT_CALLBACK;
opt.format_callback = update_index_from_diff;
read_cache();
if (do_diff_cache(tree_sha1, &opt))
return 1;
diffcore_std(&opt);
diff_flush(&opt);
diff_tree_release_paths(&opt);
return 0;
}
reset: give better reflog messages The reset command creates its reflog entry from argv. However, it does so after having run parse_options, which means the only thing left in argv is any non-option arguments. Thus you would end up with confusing reflog entries like: $ git reset --hard HEAD^ $ git reset --soft HEAD@{1} $ git log -2 -g --oneline 8e46cad HEAD@{0}: HEAD@{1}: updating HEAD 1eb9486 HEAD@{1}: HEAD^: updating HEAD However, we must also consider that some scripts may set GIT_REFLOG_ACTION before calling reset, and we need to show their reflog action (with our text appended). For example: rebase -i (squash): updating HEAD On top of that, we also set the ORIG_HEAD reflog action (even though it doesn't generally exist). In that case, the reset argument is somewhat meaningless, as it has nothing to do with what's in ORIG_HEAD. This patch changes the reset reflog code to show: $GIT_REFLOG_ACTION: updating {HEAD,ORIG_HEAD} as before, but only if GIT_REFLOG_ACTION is set. Otherwise, show: reset: moving to $rev for HEAD, and: reset: updating ORIG_HEAD for ORIG_HEAD (this is still somewhat superfluous, since we are in the ORIG_HEAD reflog, obviously, but at least we now mention which command was used to update it). While we're at it, we can clean up the code a bit: - Use strbufs to make the message. - Use the "rev" parameter instead of showing all options. This makes more sense, since it is the only thing impacting the writing of the ref. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-07-22 18:12:23 +02:00
static void set_reflog_message(struct strbuf *sb, const char *action,
const char *rev)
{
const char *rla = getenv("GIT_REFLOG_ACTION");
reset: give better reflog messages The reset command creates its reflog entry from argv. However, it does so after having run parse_options, which means the only thing left in argv is any non-option arguments. Thus you would end up with confusing reflog entries like: $ git reset --hard HEAD^ $ git reset --soft HEAD@{1} $ git log -2 -g --oneline 8e46cad HEAD@{0}: HEAD@{1}: updating HEAD 1eb9486 HEAD@{1}: HEAD^: updating HEAD However, we must also consider that some scripts may set GIT_REFLOG_ACTION before calling reset, and we need to show their reflog action (with our text appended). For example: rebase -i (squash): updating HEAD On top of that, we also set the ORIG_HEAD reflog action (even though it doesn't generally exist). In that case, the reset argument is somewhat meaningless, as it has nothing to do with what's in ORIG_HEAD. This patch changes the reset reflog code to show: $GIT_REFLOG_ACTION: updating {HEAD,ORIG_HEAD} as before, but only if GIT_REFLOG_ACTION is set. Otherwise, show: reset: moving to $rev for HEAD, and: reset: updating ORIG_HEAD for ORIG_HEAD (this is still somewhat superfluous, since we are in the ORIG_HEAD reflog, obviously, but at least we now mention which command was used to update it). While we're at it, we can clean up the code a bit: - Use strbufs to make the message. - Use the "rev" parameter instead of showing all options. This makes more sense, since it is the only thing impacting the writing of the ref. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2011-07-22 18:12:23 +02:00
strbuf_reset(sb);
if (rla)
strbuf_addf(sb, "%s: %s", rla, action);
else if (rev)
strbuf_addf(sb, "reset: moving to %s", rev);
else
strbuf_addf(sb, "reset: %s", action);
}
static void die_if_unmerged_cache(int reset_type)
{
if (is_merge() || read_cache() < 0 || unmerged_cache())
die(_("Cannot do a %s reset in the middle of a merge."),
_(reset_type_names[reset_type]));
}
static const char **parse_args(const char **argv, const char *prefix, const char **rev_ret)
{
const char *rev = "HEAD";
unsigned char unused[20];
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
/*
* Possible arguments are:
*
* git reset [-opts] [<rev>]
* git reset [-opts] <tree> [<paths>...]
* git reset [-opts] <tree> -- [<paths>...]
* git reset [-opts] -- [<paths>...]
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
* git reset [-opts] <paths>...
*
* At this point, argv points immediately after [-opts].
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
*/
if (argv[0]) {
if (!strcmp(argv[0], "--")) {
argv++; /* reset to HEAD, possibly with paths */
} else if (argv[1] && !strcmp(argv[1], "--")) {
rev = argv[0];
argv += 2;
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
}
/*
* Otherwise, argv[0] could be either <rev> or <paths> and
* has to be unambiguous. If there is a single argument, it
* can not be a tree
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
*/
else if ((!argv[1] && !get_sha1_committish(argv[0], unused)) ||
(argv[1] && !get_sha1_treeish(argv[0], unused))) {
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
/*
* Ok, argv[0] looks like a commit/tree; it should not
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
* be a filename.
*/
verify_non_filename(prefix, argv[0]);
rev = *argv++;
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
} else {
/* Otherwise we treat this as a filename */
verify_filename(prefix, argv[0], 1);
Allow "git-reset path" when unambiguous Resetting a selected set of index entries is done with "git reset -- paths" syntax, but we did not allow -- to be omitted even when the command is unambiguous. This updates the command to follow the general rule: * When -- appears, revs come before it, and paths come after it; * When there is no --, earlier ones are revs and the rest are paths, and we need to guess. When lack of -- marker forces us to guess, we protect from user errors and typoes by making sure what we treat as revs do not appear as filenames in the work tree, and what we treat as paths do appear as filenames in the work tree, and by erroring out if that is not the case. We tell the user to disambiguate by using -- in such a case. which is employed elsewhere in the system. When this rule is applied to "reset", because we can have only zero or one rev to the command, the check can be slightly simpler than other programs. We have to check only the first one or two tokens after the command name and options, and when they are: -- A: no explicit rev given; "A" and whatever follows it are paths. A --: explicit rev "A" given and whatever follows the "--" are paths. A B: "A" could be rev or path and we need to guess. "B" could be missing but if exists that (and everything that follows) would be paths. So we apply the guess only in the last case and only to "A" (not "B" and what comes after it). * As long as "A" is unambiguously a path, index entries for "A", "B" (and everything that follows) are reset to the HEAD revision. * If "A" is unambiguously a rev, on the other hand, the index entries for "B" (and everything that follows) are reset to the "A" revision. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-06-26 03:16:36 +02:00
}
}
*rev_ret = rev;
return argv[0] ? get_pathspec(prefix, argv) : NULL;
}
static int update_refs(const char *rev, const unsigned char *sha1)
{
int update_ref_status;
struct strbuf msg = STRBUF_INIT;
unsigned char *orig = NULL, sha1_orig[20],
*old_orig = NULL, sha1_old_orig[20];
if (!get_sha1("ORIG_HEAD", sha1_old_orig))
old_orig = sha1_old_orig;
if (!get_sha1("HEAD", sha1_orig)) {
orig = sha1_orig;
set_reflog_message(&msg, "updating ORIG_HEAD", NULL);
update_ref(msg.buf, "ORIG_HEAD", orig, old_orig, 0, MSG_ON_ERR);
} else if (old_orig)
delete_ref("ORIG_HEAD", old_orig, 0);
set_reflog_message(&msg, "updating HEAD", rev);
update_ref_status = update_ref(msg.buf, "HEAD", sha1, orig, 0, MSG_ON_ERR);
strbuf_release(&msg);
return update_ref_status;
}
int cmd_reset(int argc, const char **argv, const char *prefix)
{
int reset_type = NONE, update_ref_status = 0, quiet = 0;
int patch_mode = 0, unborn;
const char *rev;
unsigned char sha1[20];
const char **pathspec = NULL;
const struct option options[] = {
OPT__QUIET(&quiet, N_("be quiet, only report errors")),
OPT_SET_INT(0, "mixed", &reset_type,
N_("reset HEAD and index"), MIXED),
OPT_SET_INT(0, "soft", &reset_type, N_("reset only HEAD"), SOFT),
OPT_SET_INT(0, "hard", &reset_type,
N_("reset HEAD, index and working tree"), HARD),
OPT_SET_INT(0, "merge", &reset_type,
N_("reset HEAD, index and working tree"), MERGE),
OPT_SET_INT(0, "keep", &reset_type,
N_("reset HEAD but keep local changes"), KEEP),
OPT_BOOLEAN('p', "patch", &patch_mode, N_("select hunks interactively")),
OPT_END()
};
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, options, git_reset_usage,
PARSE_OPT_KEEP_DASHDASH);
pathspec = parse_args(argv, prefix, &rev);
unborn = !strcmp(rev, "HEAD") && get_sha1("HEAD", sha1);
if (unborn) {
/* reset on unborn branch: treat as reset to empty tree */
hashcpy(sha1, EMPTY_TREE_SHA1_BIN);
} else if (!pathspec) {
struct commit *commit;
if (get_sha1_committish(rev, sha1))
die(_("Failed to resolve '%s' as a valid revision."), rev);
commit = lookup_commit_reference(sha1);
if (!commit)
die(_("Could not parse object '%s'."), rev);
hashcpy(sha1, commit->object.sha1);
} else {
struct tree *tree;
if (get_sha1_treeish(rev, sha1))
die(_("Failed to resolve '%s' as a valid tree."), rev);
tree = parse_tree_indirect(sha1);
if (!tree)
die(_("Could not parse object '%s'."), rev);
hashcpy(sha1, tree->object.sha1);
}
if (patch_mode) {
if (reset_type != NONE)
die(_("--patch is incompatible with --{hard,mixed,soft}"));
return run_add_interactive(sha1_to_hex(sha1), "--patch=reset", pathspec);
}
/* git reset tree [--] paths... can be used to
* load chosen paths from the tree into the index without
* affecting the working tree nor HEAD. */
if (pathspec) {
if (reset_type == MIXED)
warning(_("--mixed with paths is deprecated; use 'git reset -- <paths>' instead."));
else if (reset_type != NONE)
die(_("Cannot do %s reset with paths."),
_(reset_type_names[reset_type]));
}
if (reset_type == NONE)
reset_type = MIXED; /* by default */
if (reset_type != SOFT && reset_type != MIXED)
setup_work_tree();
if (reset_type == MIXED && is_bare_repository())
die(_("%s reset is not allowed in a bare repository"),
_(reset_type_names[reset_type]));
/* Soft reset does not touch the index file nor the working tree
* at all, but requires them in a good order. Other resets reset
* the index file to the tree object we are switching to. */
if (reset_type == SOFT || reset_type == KEEP)
die_if_unmerged_cache(reset_type);
if (reset_type != SOFT) {
struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
int newfd = hold_locked_index(lock, 1);
if (reset_type == MIXED) {
int flags = quiet ? REFRESH_QUIET : REFRESH_IN_PORCELAIN;
if (read_from_tree(pathspec, sha1))
return 1;
refresh_index(&the_index, flags, NULL, NULL,
_("Unstaged changes after reset:"));
} else {
int err = reset_index(sha1, reset_type, quiet);
if (reset_type == KEEP && !err)
err = reset_index(sha1, MIXED, quiet);
if (err)
die(_("Could not reset index file to revision '%s'."), rev);
}
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(lock))
die(_("Could not write new index file."));
}
if (!pathspec && !unborn) {
/* Any resets without paths update HEAD to the head being
* switched to, saving the previous head in ORIG_HEAD before. */
update_ref_status = update_refs(rev, sha1);
if (reset_type == HARD && !update_ref_status && !quiet)
print_new_head_line(lookup_commit_reference(sha1));
}
if (!pathspec)
remove_branch_state();
return update_ref_status;
}