hg: support for auto sharing stores when cloning
Many 3rd party consumers of Mercurial have created wrappers to
essentially perform clone+share as a single operation. This is
especially popular in automated processes like continuous integration
systems. The Jenkins CI software and Mozilla's Firefox release
automation infrastructure have both implemented custom code that
effectively perform clone+share. The common use case here is that
clients want to obtain N>1 checkouts while minimizing disk space and
network requirements. Furthermore, they often don't care that a clone
is an exact mirror of a remote: they are simply looking to obtain
checkouts of specific revisions.
When multiple third parties implement a similar feature, it's a good
sign that the feature is worth adding to the core product. This patch
adds support for an easy-to-use clone+share feature.
The internal "clone" function now accepts options to control auto
sharing during clone. When the auto share mode is active, a store will
be created/updated under the base directory specified and a new
repository pointing to the shared store will be created at the path
specified by the user.
The share extension has grown the ability to pass these options into
the clone command/function.
No command line options for this feature are added because we don't
feel the feature will be popular enough to warrant their existence.
There are two modes for auto share mode. In the default mode, the shared
repo is derived from the first changeset (rev 0) in the remote
repository. This enables related repositories existing at different URLs
to automatically use the same storage. In environments that operate
several repositories (separate repo for branch/head/bookmark or separate
repo per user), this has the potential to drastically reduce storage
and network requirements. In the other mode, the name is derived from the
remote's path/URL.
Test EOL extension
$ cat >> $HGRCPATH <<EOF
> [diff]
> git = True
> EOF
Set up helpers
$ cat > switch-eol.py <<EOF
> import sys
> try:
> import os, msvcrt
> msvcrt.setmode(sys.stdin.fileno(), os.O_BINARY)
> msvcrt.setmode(sys.stdout.fileno(), os.O_BINARY)
> except ImportError:
> pass
> (old, new) = sys.argv[1] == 'LF' and ('\n', '\r\n') or ('\r\n', '\n')
> print "%% switching encoding from %r to %r" % (old, new)
> for path in sys.argv[2:]:
> data = file(path, 'rb').read()
> data = data.replace(old, new)
> file(path, 'wb').write(data)
> EOF
$ seteol () {
> if [ $1 = "LF" ]; then
> EOL='\n'
> else
> EOL='\r\n'
> fi
> }
$ makerepo () {
> seteol $1
> echo "% setup $1 repository"
> hg init repo
> cd repo
> cat > .hgeol <<EOF
> [repository]
> native = $1
> [patterns]
> mixed.txt = BIN
> **.txt = native
> EOF
> printf "first${EOL}second${EOL}third${EOL}" > a.txt
> hg commit --addremove -m 'checkin'
> echo
> cd ..
> }
$ dotest () {
> seteol $1
> echo "% hg clone repo repo-$1"
> hg clone --noupdate repo repo-$1
> cd repo-$1
> cat > .hg/hgrc <<EOF
> [extensions]
> eol =
> [eol]
> native = $1
> EOF
> hg update
> echo '% a.txt'
> cat a.txt
> echo '% hg cat a.txt'
> hg cat a.txt
> printf "fourth${EOL}" >> a.txt
> echo '% a.txt'
> cat a.txt
> hg diff
> python ../switch-eol.py $1 a.txt
> echo '% hg diff only reports a single changed line:'
> hg diff
> echo "% reverting back to $1 format"
> hg revert a.txt
> cat a.txt
> printf "first\r\nsecond\n" > mixed.txt
> hg add mixed.txt
> echo "% hg commit of inconsistent .txt file marked as binary (should work)"
> hg commit -m 'binary file'
> echo "% hg commit of inconsistent .txt file marked as native (should fail)"
> printf "first\nsecond\r\nthird\nfourth\r\n" > a.txt
> hg commit -m 'inconsistent file'
> echo "% hg commit --config eol.only-consistent=False (should work)"
> hg commit --config eol.only-consistent=False -m 'inconsistent file'
> echo "% hg commit of binary .txt file marked as native (binary files always okay)"
> printf "first${EOL}\0${EOL}third${EOL}" > a.txt
> hg commit -m 'binary file'
> cd ..
> rm -r repo-$1
> }
$ makemixedrepo () {
> echo
> echo "# setup $1 repository"
> hg init mixed
> cd mixed
> printf "foo\r\nbar\r\nbaz\r\n" > win.txt
> printf "foo\nbar\nbaz\n" > unix.txt
> #printf "foo\r\nbar\nbaz\r\n" > mixed.txt
> hg commit --addremove -m 'created mixed files'
> echo "# setting repository-native EOLs to $1"
> cat > .hgeol <<EOF
> [repository]
> native = $1
> [patterns]
> **.txt = native
> EOF
> hg commit --addremove -m 'added .hgeol'
> cd ..
> }
$ testmixed () {
> echo
> echo "% hg clone mixed mixed-$1"
> hg clone mixed mixed-$1
> cd mixed-$1
> echo '% hg status (eol extension not yet activated)'
> hg status
> cat > .hg/hgrc <<EOF
> [extensions]
> eol =
> [eol]
> native = $1
> EOF
> echo '% hg status (eol activated)'
> hg status
> echo '% hg commit'
> hg commit -m 'synchronized EOLs'
> echo '% hg status'
> hg status
> cd ..
> rm -r mixed-$1
> }
Basic tests
$ makerepo LF
% setup LF repository
adding .hgeol
adding a.txt
$ dotest LF
% hg clone repo repo-LF
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
% a.txt
first
second
third
% hg cat a.txt
first
second
third
% a.txt
first
second
third
fourth
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first
second
third
+fourth
% switching encoding from '\n' to '\r\n'
% hg diff only reports a single changed line:
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first
second
third
+fourth
% reverting back to LF format
first
second
third
% hg commit of inconsistent .txt file marked as binary (should work)
% hg commit of inconsistent .txt file marked as native (should fail)
abort: inconsistent newline style in a.txt
% hg commit --config eol.only-consistent=False (should work)
% hg commit of binary .txt file marked as native (binary files always okay)
$ dotest CRLF
% hg clone repo repo-CRLF
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
% a.txt
first\r (esc)
second\r (esc)
third\r (esc)
% hg cat a.txt
first
second
third
% a.txt
first\r (esc)
second\r (esc)
third\r (esc)
fourth\r (esc)
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first
second
third
+fourth
% switching encoding from '\r\n' to '\n'
% hg diff only reports a single changed line:
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first
second
third
+fourth
% reverting back to CRLF format
first\r (esc)
second\r (esc)
third\r (esc)
% hg commit of inconsistent .txt file marked as binary (should work)
% hg commit of inconsistent .txt file marked as native (should fail)
abort: inconsistent newline style in a.txt
% hg commit --config eol.only-consistent=False (should work)
% hg commit of binary .txt file marked as native (binary files always okay)
$ rm -r repo
$ makerepo CRLF
% setup CRLF repository
adding .hgeol
adding a.txt
$ dotest LF
% hg clone repo repo-LF
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
% a.txt
first
second
third
% hg cat a.txt
first\r (esc)
second\r (esc)
third\r (esc)
% a.txt
first
second
third
fourth
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first\r (esc)
second\r (esc)
third\r (esc)
+fourth\r (esc)
% switching encoding from '\n' to '\r\n'
% hg diff only reports a single changed line:
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first\r (esc)
second\r (esc)
third\r (esc)
+fourth\r (esc)
% reverting back to LF format
first
second
third
% hg commit of inconsistent .txt file marked as binary (should work)
% hg commit of inconsistent .txt file marked as native (should fail)
abort: inconsistent newline style in a.txt
% hg commit --config eol.only-consistent=False (should work)
% hg commit of binary .txt file marked as native (binary files always okay)
$ dotest CRLF
% hg clone repo repo-CRLF
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
% a.txt
first\r (esc)
second\r (esc)
third\r (esc)
% hg cat a.txt
first\r (esc)
second\r (esc)
third\r (esc)
% a.txt
first\r (esc)
second\r (esc)
third\r (esc)
fourth\r (esc)
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first\r (esc)
second\r (esc)
third\r (esc)
+fourth\r (esc)
% switching encoding from '\r\n' to '\n'
% hg diff only reports a single changed line:
diff --git a/a.txt b/a.txt
--- a/a.txt
+++ b/a.txt
@@ -1,3 +1,4 @@
first\r (esc)
second\r (esc)
third\r (esc)
+fourth\r (esc)
% reverting back to CRLF format
first\r (esc)
second\r (esc)
third\r (esc)
% hg commit of inconsistent .txt file marked as binary (should work)
% hg commit of inconsistent .txt file marked as native (should fail)
abort: inconsistent newline style in a.txt
% hg commit --config eol.only-consistent=False (should work)
% hg commit of binary .txt file marked as native (binary files always okay)
$ rm -r repo
Mixed tests
$ makemixedrepo LF
# setup LF repository
adding unix.txt
adding win.txt
# setting repository-native EOLs to LF
adding .hgeol
$ testmixed LF
% hg clone mixed mixed-LF
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
% hg status (eol extension not yet activated)
% hg status (eol activated)
M win.txt
% hg commit
% hg status
$ testmixed CRLF
% hg clone mixed mixed-CRLF
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
% hg status (eol extension not yet activated)
% hg status (eol activated)
M win.txt
% hg commit
% hg status
$ rm -r mixed
$ makemixedrepo CRLF
# setup CRLF repository
adding unix.txt
adding win.txt
# setting repository-native EOLs to CRLF
adding .hgeol
$ testmixed LF
% hg clone mixed mixed-LF
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
% hg status (eol extension not yet activated)
% hg status (eol activated)
M unix.txt
% hg commit
% hg status
$ testmixed CRLF
% hg clone mixed mixed-CRLF
updating to branch default
3 files updated, 0 files merged, 0 files removed, 0 files unresolved
% hg status (eol extension not yet activated)
% hg status (eol activated)
M unix.txt
% hg commit
% hg status
$ rm -r mixed
$ echo '[extensions]' >> $HGRCPATH
$ echo 'eol =' >> $HGRCPATH
#if unix-permissions
Test issue2569 -- eol extension takes write lock on reading:
$ hg init repo
$ cd repo
$ touch .hgeol
$ hg status
? .hgeol
$ chmod -R -w .hg
$ sleep 1
$ touch .hgeol
$ hg status --traceback
? .hgeol
$ chmod -R u+w .hg
$ cd ..
#endif
Test cleverencode: and cleverdecode: aliases for win32text extension
$ cat <<EOF >> $HGRCPATH
> [encode]
> **.txt = cleverencode:
> [decode]
> **.txt = cleverdecode:
> EOF
$ hg init win32compat
$ cd win32compat
$ printf "foo\r\nbar\r\nbaz\r\n" > win.txt
$ printf "foo\nbar\nbaz\n" > unix.txt
$ hg add
adding unix.txt
adding win.txt
$ hg commit -m checkin
Check that both files have LF line-endings in the repository:
$ hg cat win.txt
foo
bar
baz
$ hg cat unix.txt
foo
bar
baz
Test handling of a broken .hgeol file:
$ touch .hgeol
$ hg add .hgeol
$ hg commit -m 'clean version'
$ echo "bad" > .hgeol
$ hg status
warning: ignoring .hgeol file due to parse error at .hgeol:1: bad
M .hgeol
$ hg revert .hgeol
warning: ignoring .hgeol file due to parse error at .hgeol:1: bad
$ hg status
? .hgeol.orig
Test eol.only-consistent can be specified in .hgeol
$ cd $TESTTMP
$ hg init only-consistent
$ cd only-consistent
$ printf "first\nsecond\r\n" > a.txt
$ hg add a.txt
$ cat > .hgeol << EOF
> [eol]
> only-consistent = True
> EOF
$ hg commit -m 'inconsistent'
abort: inconsistent newline style in a.txt
[255]
$ cat > .hgeol << EOF
> [eol]
> only-consistent = False
> EOF
$ hg commit -m 'consistent'
Test trailing newline
$ cat >> $HGRCPATH <<EOF
> [extensions]
> eol=
> EOF
setup repository
$ cd $TESTTMP
$ hg init trailing
$ cd trailing
$ cat > .hgeol <<EOF
> [patterns]
> **.txt = native
> [eol]
> fix-trailing-newline = False
> EOF
add text without trailing newline
$ printf "first\nsecond" > a.txt
$ hg commit --addremove -m 'checking in'
adding .hgeol
adding a.txt
$ rm a.txt
$ hg update -C -q
$ cat a.txt
first
second (no-eol)
$ cat > .hgeol <<EOF
> [patterns]
> **.txt = native
> [eol]
> fix-trailing-newline = True
> EOF
$ printf "third\nfourth" > a.txt
$ hg commit -m 'checking in with newline fix'
$ rm a.txt
$ hg update -C -q
$ cat a.txt
third
fourth
append a line without trailing newline
$ printf "fifth" >> a.txt
$ hg commit -m 'adding another line line'
$ rm a.txt
$ hg update -C -q
$ cat a.txt
third
fourth
fifth
amend of changesets with renamed/deleted files expose new code paths
$ hg mv a.txt b.txt
$ hg ci --amend -q
$ hg diff -c.
diff --git a/a.txt b/b.txt
rename from a.txt
rename to b.txt
--- a/a.txt
+++ b/b.txt
@@ -1,2 +1,3 @@
third
fourth
+fifth
$ cd ..