Add --temp and --stage=all options to checkout-index.

Sometimes it is convient for a Porcelain to be able to checkout all
unmerged files in all stages so that an external merge tool can be
executed by the Porcelain or the end-user.  Using git-unpack-file
on each stage individually incurs a rather high penalty due to the
need to fork for each file version obtained.  git-checkout-index -a
--stage=all will now do the same thing, but faster.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-checkout-index.txt b/Documentation/git-checkout-index.txt
index b0b65889ac5e91661e9a68161dda1bb9660c0bb5..09bd6a5535835b50da0848892d1fb497710d9781 100644 (file)
--- a/Documentation/git-checkout-index.txt
+++ b/Documentation/git-checkout-index.txt
@@ -10,7 +10,8 @@ SYNOPSIS
 --------
 [verse]
 'git-checkout-index' [-u] [-q] [-a] [-f] [-n] [--prefix=<string>]
-                  [--stage=<number>]
+                  [--stage=<number>|all]
+                  [--temp]
                   [-z] [--stdin]
                   [--] [<file>]\*
 
@@ -43,9 +44,15 @@ OPTIONS
        When creating files, prepend <string> (usually a directory
        including a trailing /)
 
---stage=<number>::
+--stage=<number>|all::
        Instead of checking out unmerged entries, copy out the
        files from named stage.  <number> must be between 1 and 3.
+       Note: --stage=all automatically implies --temp.
+
+--temp::
+       Instead of copying the files to the working directory
+       write the content to temporary files.  The temporary name
+       associations will be written to stdout.
 
 --stdin::
        Instead of taking list of paths from the command line,
@@ -87,6 +94,46 @@ it will prevent problems with a filename of, for example,  `-a`.
 Using `--` is probably a good policy in scripts.
 
 
+Using --temp or --stage=all
+---------------------------
+When `--temp` is used (or implied by `--stage=all`)
+`git-checkout-index` will create a temporary file for each index
+entry being checked out.  The index will not be updated with stat
+information.  These options can be useful if the caller needs all
+stages of all unmerged entries so that the unmerged files can be
+processed by an external merge tool.
+
+A listing will be written to stdout providing the association of
+temporary file names to tracked path names.  The listing format
+has two variations:
+
+    . tempname TAB path RS
++
+The first format is what gets used when `--stage` is omitted or
+is not `--stage=all`. The field tempname is the temporary file
+name holding the file content and path is the tracked path name in
+the index.  Only the requested entries are output.
+
+    . stage1temp SP stage2temp SP stage3tmp TAB path RS
++
+The second format is what gets used when `--stage=all`.  The three
+stage temporary fields (stage1temp, stage2temp, stage3temp) list the
+name of the temporary file if there is a stage entry in the index
+or `.` if there is no stage entry.  Paths which only have a stage 0
+entry will always be omitted from the output.
+
+In both formats RS (the record separator) is newline by default
+but will be the null byte if -z was passed on the command line.
+The temporary file names are always safe strings; they will never
+contain directory separators or whitespace characters.  The path
+field is always relative to the current directory and the temporary
+file names are always relative to the top level directory.
+
+If the object being copied out to a temporary file is a symbolic
+link the content of the link will be written to a normal file.  It is
+up to the end-user or the Porcelain to make use of this information.
+
+
 EXAMPLES
 --------
 To update and refresh only the files already checked out::

diff --git a/apply.c b/apply.c
index c3699668671706d35b84d78cfa6ccee675f684b4..849a8b4485e65c7eac315daca60b781965a1d22e 100644 (file)
--- a/apply.c
+++ b/apply.c
@@ -1402,7 +1402,8 @@ static int check_patch(struct patch *patch)
                                costate.not_new = 0;
                                costate.refresh_cache = 1;
                                if (checkout_entry(active_cache[pos],
-                                                  &costate) ||
+                                                  &costate,
+                                                  NULL) ||
                                    lstat(old_name, &st))
                                        return -1;
                        }

diff --git a/cache.h b/cache.h
index 8dc1de16e4270ed138007be6576259f97c159e2a..1f962809b0be75b83abc285d492b62c7e6426623 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -262,7 +262,7 @@ struct checkout {
                 refresh_cache:1;
 };
 
-extern int checkout_entry(struct cache_entry *ce, struct checkout *state);
+extern int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath);
 
 extern struct alternate_object_database {
        struct alternate_object_database *next;

diff --git a/checkout-index.c b/checkout-index.c
index f54c606414c27a7fc42a557fb0dee438b2abffec..7b78715417039fe1d43699270cdc3d5adf6d2e9c 100644 (file)
--- a/checkout-index.c
+++ b/checkout-index.c
@@ -40,9 +40,13 @@
 #include "strbuf.h"
 #include "quote.h"
 
+#define CHECKOUT_ALL 4
 static const char *prefix;
 static int prefix_length;
+static int line_termination = '\n';
 static int checkout_stage; /* default to checkout stage0 */
+static int to_tempfile;
+static char topath[4][MAXPATHLEN+1];
 
 static struct checkout state = {
        .base_dir = "",
@@ -53,11 +57,39 @@ static struct checkout state = {
        .refresh_cache = 0,
 };
 
+static void write_tempfile_record (const char *name)
+{
+       int i;
+
+       if (CHECKOUT_ALL == checkout_stage) {
+               for (i = 1; i < 4; i++) {
+                       if (i > 1)
+                               putchar(' ');
+                       if (topath[i][0])
+                               fputs(topath[i], stdout);
+                       else
+                               putchar('.');
+               }
+       } else
+               fputs(topath[checkout_stage], stdout);
+
+       putchar('\t');
+       write_name_quoted("", 0, name + prefix_length,
+               line_termination, stdout);
+       putchar(line_termination);
+
+       for (i = 0; i < 4; i++) {
+               topath[i][0] = 0;
+       }
+}
+
 static int checkout_file(const char *name)
 {
        int namelen = strlen(name);
        int pos = cache_name_pos(name, namelen);
        int has_same_name = 0;
+       int did_checkout = 0;
+       int errs = 0;
 
        if (pos < 0)
                pos = -pos - 1;
@@ -68,9 +100,20 @@ static int checkout_file(const char *name)
                    memcmp(ce->name, name, namelen))
                        break;
                has_same_name = 1;
-               if (checkout_stage == ce_stage(ce))
-                       return checkout_entry(ce, &state);
                pos++;
+               if (ce_stage(ce) != checkout_stage
+                   && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
+                       continue;
+               did_checkout = 1;
+               if (checkout_entry(ce, &state,
+                   to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
+                       errs++;
+       }
+
+       if (did_checkout) {
+               if (to_tempfile)
+                       write_tempfile_record(name);
+               return errs > 0 ? -1 : 0;
        }
 
        if (!state.quiet) {
@@ -90,18 +133,29 @@ static int checkout_file(const char *name)
 static int checkout_all(void)
 {
        int i, errs = 0;
+       struct cache_entry* last_ce = 0;
 
        for (i = 0; i < active_nr ; i++) {
                struct cache_entry *ce = active_cache[i];
-               if (ce_stage(ce) != checkout_stage)
+               if (ce_stage(ce) != checkout_stage
+                   && (CHECKOUT_ALL != checkout_stage || !ce_stage(ce)))
                        continue;
                if (prefix && *prefix &&
                    (ce_namelen(ce) <= prefix_length ||
                     memcmp(prefix, ce->name, prefix_length)))
                        continue;
-               if (checkout_entry(ce, &state) < 0)
+               if (last_ce && to_tempfile) {
+                       if (ce_namelen(last_ce) != ce_namelen(ce)
+                           || memcmp(last_ce->name, ce->name, ce_namelen(ce)))
+                               write_tempfile_record(last_ce->name);
+               }
+               if (checkout_entry(ce, &state,
+                   to_tempfile ? topath[ce_stage(ce)] : NULL) < 0)
                        errs++;
+               last_ce = ce;
        }
+       if (last_ce && to_tempfile)
+               write_tempfile_record(last_ce->name);
        if (errs)
                /* we have already done our error reporting.
                 * exit with the same code as die().
@@ -111,7 +165,7 @@ static int checkout_all(void)
 }
 
 static const char checkout_cache_usage[] =
-"git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]] [--prefix=<string>] [--] <file>...";
+"git-checkout-index [-u] [-q] [-a] [-f] [-n] [--stage=[123]|all] [--prefix=<string>] [--temp] [--] <file>...";
 
 static struct cache_file cache_file;
 
@@ -121,7 +175,6 @@ int main(int argc, char **argv)
        int newfd = -1;
        int all = 0;
        int read_from_stdin = 0;
-       int line_termination = '\n';
 
        prefix = setup_git_directory();
        git_config(git_default_config);
@@ -175,17 +228,26 @@ int main(int argc, char **argv)
                        i++; /* do not consider arg as a file name */
                        break;
                }
+               if (!strcmp(arg, "--temp")) {
+                       to_tempfile = 1;
+                       continue;
+               }
                if (!strncmp(arg, "--prefix=", 9)) {
                        state.base_dir = arg+9;
                        state.base_dir_len = strlen(state.base_dir);
                        continue;
                }
                if (!strncmp(arg, "--stage=", 8)) {
-                       int ch = arg[8];
-                       if ('1' <= ch && ch <= '3')
-                               checkout_stage = arg[8] - '0';
-                       else
-                               die("stage should be between 1 and 3");
+                       if (!strcmp(arg + 8, "all")) {
+                               to_tempfile = 1;
+                               checkout_stage = CHECKOUT_ALL;
+                       } else {
+                               int ch = arg[8];
+                               if ('1' <= ch && ch <= '3')
+                                       checkout_stage = arg[8] - '0';
+                               else
+                                       die("stage should be between 1 and 3 or all");
+                       }
                        continue;
                }
                if (arg[0] == '-')
@@ -193,7 +255,7 @@ int main(int argc, char **argv)
                break;
        }
 
-       if (state.base_dir_len) {
+       if (state.base_dir_len || to_tempfile) {
                /* when --prefix is specified we do not
                 * want to update cache.
                 */

diff --git a/entry.c b/entry.c
index 8fb99bc83f2d168e4a374d076608a2f42abbe434..5d9aefd03fa4ff0e86d1212dc3354c9b50bba22a 100644 (file)
--- a/entry.c
+++ b/entry.c
@@ -63,7 +63,7 @@ static int create_file(const char *path, unsigned int mode)
        return open(path, O_WRONLY | O_CREAT | O_EXCL, mode);
 }
 
-static int write_entry(struct cache_entry *ce, const char *path, struct checkout *state)
+static int write_entry(struct cache_entry *ce, char *path, struct checkout *state, int to_tempfile)
 {
        int fd;
        void *new;
@@ -80,7 +80,11 @@ static int write_entry(struct cache_entry *ce, const char *path, struct checkout
        }
        switch (ntohl(ce->ce_mode) & S_IFMT) {
        case S_IFREG:
-               fd = create_file(path, ntohl(ce->ce_mode));
+               if (to_tempfile) {
+                       strcpy(path, ".merge_file_XXXXXX");
+                       fd = mkstemp(path);
+               } else
+                       fd = create_file(path, ntohl(ce->ce_mode));
                if (fd < 0) {
                        free(new);
                        return error("git-checkout-index: unable to create file %s (%s)",
@@ -93,12 +97,27 @@ static int write_entry(struct cache_entry *ce, const char *path, struct checkout
                        return error("git-checkout-index: unable to write file %s", path);
                break;
        case S_IFLNK:
-               if (symlink(new, path)) {
+               if (to_tempfile) {
+                       strcpy(path, ".merge_link_XXXXXX");
+                       fd = mkstemp(path);
+                       if (fd < 0) {
+                               free(new);
+                               return error("git-checkout-index: unable to create "
+                                                "file %s (%s)", path, strerror(errno));
+                       }
+                       wrote = write(fd, new, size);
+                       close(fd);
+                       free(new);
+                       if (wrote != size)
+                               return error("git-checkout-index: unable to write file %s",
+                                       path);
+               } else {
+                       wrote = symlink(new, path);
                        free(new);
-                       return error("git-checkout-index: unable to create "
-                                    "symlink %s (%s)", path, strerror(errno));
+                       if (wrote)
+                               return error("git-checkout-index: unable to create "
+                                                "symlink %s (%s)", path, strerror(errno));
                }
-               free(new);
                break;
        default:
                free(new);
@@ -113,12 +132,15 @@ static int write_entry(struct cache_entry *ce, const char *path, struct checkout
        return 0;
 }
 
-int checkout_entry(struct cache_entry *ce, struct checkout *state)
+int checkout_entry(struct cache_entry *ce, struct checkout *state, char *topath)
 {
-       struct stat st;
        static char path[MAXPATHLEN+1];
+       struct stat st;
        int len = state->base_dir_len;
 
+       if (topath)
+               return write_entry(ce, topath, state, 1);
+
        memcpy(path, state->base_dir, len);
        strcpy(path + len, ce->name);
 
@@ -144,10 +166,10 @@ int checkout_entry(struct cache_entry *ce, struct checkout *state)
                                return error("%s is a directory", path);
                        remove_subtree(path);
                }
-       } else if (state->not_new) 
+       } else if (state->not_new)
                return 0;
        create_directories(path, state);
-       return write_entry(ce, path, state);
+       return write_entry(ce, path, state, 0);
 }
 
 

diff --git a/read-tree.c b/read-tree.c
index be29b3fe11a370e53d3dce6a43dfccdc0e22ae2c..1c3b09beffdf347af40b385f632d481c99645a33 100644 (file)
--- a/read-tree.c
+++ b/read-tree.c
@@ -337,7 +337,7 @@ static void check_updates(struct cache_entry **src, int nr)
                if (ce->ce_flags & mask) {
                        ce->ce_flags &= ~mask;
                        if (update)
-                               checkout_entry(ce, &state);
+                               checkout_entry(ce, &state, NULL);
                }
        }
        if (total) {

diff --git a/t/t2004-checkout-cache-temp.sh b/t/t2004-checkout-cache-temp.sh
new file mode 100755 (executable)
index 0000000..c100959
--- /dev/null
+++ b/t/t2004-checkout-cache-temp.sh
@@ -0,0 +1,212 @@
+#!/bin/sh
+#
+# Copyright (c) 2006 Shawn Pearce
+#
+
+test_description='git-checkout-index --temp test.
+
+With --temp flag, git-checkout-index writes to temporary merge files
+rather than the tracked path.'
+
+. ./test-lib.sh
+
+test_expect_success \
+'preparation' '
+mkdir asubdir &&
+echo tree1path0 >path0 &&
+echo tree1path1 >path1 &&
+echo tree1path3 >path3 &&
+echo tree1path4 >path4 &&
+echo tree1asubdir/path5 >asubdir/path5 &&
+git-update-index --add path0 path1 path3 path4 asubdir/path5 &&
+t1=$(git-write-tree) &&
+rm -f path* .merge_* out .git/index &&
+echo tree2path0 >path0 &&
+echo tree2path1 >path1 &&
+echo tree2path2 >path2 &&
+echo tree2path4 >path4 &&
+git-update-index --add path0 path1 path2 path4 &&
+t2=$(git-write-tree) &&
+rm -f path* .merge_* out .git/index &&
+echo tree2path0 >path0 &&
+echo tree3path1 >path1 &&
+echo tree3path2 >path2 &&
+echo tree3path3 >path3 &&
+git-update-index --add path0 path1 path2 path3 &&
+t3=$(git-write-tree)'
+
+test_expect_success \
+'checkout one stage 0 to temporary file' '
+rm -f path* .merge_* out .git/index &&
+git-read-tree $t1 &&
+git-checkout-index --temp -- path1 >out &&
+test $(wc -l <out) = 1 &&
+test $(cut "-d " -f2 out) = path1 &&
+p=$(cut "-d    " -f1 out) &&
+test -f $p &&
+test $(cat $p) = tree1path1'
+
+test_expect_success \
+'checkout all stage 0 to temporary files' '
+rm -f path* .merge_* out .git/index &&
+git-read-tree $t1 &&
+git-checkout-index -a --temp >out &&
+test $(wc -l <out) = 5 &&
+for f in path0 path1 path3 path4 asubdir/path5
+do
+       test $(grep $f out | cut "-d    " -f2) = $f &&
+       p=$(grep $f out | cut "-d       " -f1) &&
+       test -f $p &&
+       test $(cat $p) = tree1$f
+done'
+
+test_expect_success \
+'prepare 3-way merge' '
+rm -f path* .merge_* out .git/index &&
+git-read-tree -m $t1 $t2 $t3'
+
+test_expect_success \
+'checkout one stage 2 to temporary file' '
+rm -f path* .merge_* out &&
+git-checkout-index --stage=2 --temp -- path1 >out &&
+test $(wc -l <out) = 1 &&
+test $(cut "-d " -f2 out) = path1 &&
+p=$(cut "-d    " -f1 out) &&
+test -f $p &&
+test $(cat $p) = tree2path1'
+
+test_expect_success \
+'checkout all stage 2 to temporary files' '
+rm -f path* .merge_* out &&
+git-checkout-index --all --stage=2 --temp >out &&
+test $(wc -l <out) = 3 &&
+for f in path1 path2 path4
+do
+       test $(grep $f out | cut "-d    " -f2) = $f &&
+       p=$(grep $f out | cut "-d       " -f1) &&
+       test -f $p &&
+       test $(cat $p) = tree2$f
+done'
+
+test_expect_success \
+'checkout all stages/one file to nothing' '
+rm -f path* .merge_* out &&
+git-checkout-index --stage=all --temp -- path0 >out &&
+test $(wc -l <out) = 0'
+
+test_expect_success \
+'checkout all stages/one file to temporary files' '
+rm -f path* .merge_* out &&
+git-checkout-index --stage=all --temp -- path1 >out &&
+test $(wc -l <out) = 1 &&
+test $(cut "-d " -f2 out) = path1 &&
+cut "-d        " -f1 out | (read s1 s2 s3 &&
+test -f $s1 &&
+test -f $s2 &&
+test -f $s3 &&
+test $(cat $s1) = tree1path1 &&
+test $(cat $s2) = tree2path1 &&
+test $(cat $s3) = tree3path1)'
+
+test_expect_success \
+'checkout some stages/one file to temporary files' '
+rm -f path* .merge_* out &&
+git-checkout-index --stage=all --temp -- path2 >out &&
+test $(wc -l <out) = 1 &&
+test $(cut "-d " -f2 out) = path2 &&
+cut "-d        " -f1 out | (read s1 s2 s3 &&
+test $s1 = . &&
+test -f $s2 &&
+test -f $s3 &&
+test $(cat $s2) = tree2path2 &&
+test $(cat $s3) = tree3path2)'
+
+test_expect_success \
+'checkout all stages/all files to temporary files' '
+rm -f path* .merge_* out &&
+git-checkout-index -a --stage=all --temp >out &&
+test $(wc -l <out) = 5'
+
+test_expect_success \
+'-- path0: no entry' '
+test x$(grep path0 out | cut "-d       " -f2) = x'
+
+test_expect_success \
+'-- path1: all 3 stages' '
+test $(grep path1 out | cut "-d        " -f2) = path1 &&
+grep path1 out | cut "-d       " -f1 | (read s1 s2 s3 &&
+test -f $s1 &&
+test -f $s2 &&
+test -f $s3 &&
+test $(cat $s1) = tree1path1 &&
+test $(cat $s2) = tree2path1 &&
+test $(cat $s3) = tree3path1)'
+
+test_expect_success \
+'-- path2: no stage 1, have stage 2 and 3' '
+test $(grep path2 out | cut "-d        " -f2) = path2 &&
+grep path2 out | cut "-d       " -f1 | (read s1 s2 s3 &&
+test $s1 = . &&
+test -f $s2 &&
+test -f $s3 &&
+test $(cat $s2) = tree2path2 &&
+test $(cat $s3) = tree3path2)'
+
+test_expect_success \
+'-- path3: no stage 2, have stage 1 and 3' '
+test $(grep path3 out | cut "-d        " -f2) = path3 &&
+grep path3 out | cut "-d       " -f1 | (read s1 s2 s3 &&
+test -f $s1 &&
+test $s2 = . &&
+test -f $s3 &&
+test $(cat $s1) = tree1path3 &&
+test $(cat $s3) = tree3path3)'
+
+test_expect_success \
+'-- path4: no stage 3, have stage 1 and 3' '
+test $(grep path4 out | cut "-d        " -f2) = path4 &&
+grep path4 out | cut "-d       " -f1 | (read s1 s2 s3 &&
+test -f $s1 &&
+test -f $s2 &&
+test $s3 = . &&
+test $(cat $s1) = tree1path4 &&
+test $(cat $s2) = tree2path4)'
+
+test_expect_success \
+'-- asubdir/path5: no stage 2 and 3 have stage 1' '
+test $(grep asubdir/path5 out | cut "-d        " -f2) = asubdir/path5 &&
+grep asubdir/path5 out | cut "-d       " -f1 | (read s1 s2 s3 &&
+test -f $s1 &&
+test $s2 = . &&
+test $s3 = . &&
+test $(cat $s1) = tree1asubdir/path5)'
+
+test_expect_success \
+'checkout --temp within subdir' '
+(cd asubdir &&
+ git-checkout-index -a --stage=all >out &&
+ test $(wc -l <out) = 1 &&
+ test $(grep path5 out | cut "-d       " -f2) = path5 &&
+ grep path5 out | cut "-d      " -f1 | (read s1 s2 s3 &&
+ test -f ../$s1 &&
+ test $s2 = . &&
+ test $s3 = . &&
+ test $(cat ../$s1) = tree1asubdir/path5)
+)'
+
+test_expect_success \
+'checkout --temp symlink' '
+rm -f path* .merge_* out .git/index &&
+ln -s b a &&
+git-update-index --add a &&
+t4=$(git-write-tree) &&
+rm -f .git/index &&
+git-read-tree $t4 &&
+git-checkout-index --temp -a >out &&
+test $(wc -l <out) = 1 &&
+test $(cut "-d " -f2 out) = a &&
+p=$(cut "-d    " -f1 out) &&
+test -f $p &&
+test $(cat $p) = b'
+
+test_done