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diff tests/test-convert-identity.t @ 42620:d98ec36be808

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convert: add a config option to help doing identity hg->hg conversion I want to change the computation of the list of files modified by a commit. In principle, this would simply change a cache. But since this information is stored in commits rather than a cache, changing it means changing commit hashes (going forward). Some users rely on the convert extension from hg to hg not changing hashes when nothing changes (usually). Allow these users to preserve hashes despite changes to the changelog files computation by reusing these files lists when the manifest is unchanged (since these files list are derived from the manifest). Differential Revision: https://phab.mercurial-scm.org/D6643
author Valentin Gatien-Baron <valentin.gatienbaron@gmail.com>
date Sat, 13 Jul 2019 23:45:32 -0400
parents
children a2c02877b097
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-convert-identity.t	Sat Jul 13 23:45:32 2019 -0400
@@ -0,0 +1,40 @@
+Testing that convert.hg.preserve-hash=true can be used to make hg
+convert from hg repo to hg repo preserve hashes, even if the
+computation of the files list in commits change slightly between hg
+versions.
+
+  $ cat <<'EOF' >> "$HGRCPATH"
+  > [extensions]
+  > convert =
+  > EOF
+  $ cat <<'EOF' > changefileslist.py
+  > from mercurial import (changelog, extensions)
+  > def wrap(orig, clog, manifest, files, *args, **kwargs):
+  >   return orig(clog, manifest, ["a"], *args, **kwargs)
+  > def extsetup(ui):
+  >   extensions.wrapfunction(changelog.changelog, 'add', wrap)
+  > EOF
+
+  $ hg init repo
+  $ cd repo
+  $ echo a > a; hg commit -qAm a
+  $ echo b > a; hg commit -qAm b
+  $ hg up -qr 0; echo c > c; hg commit -qAm c
+  $ hg merge -qr 1
+  $ hg commit -m_ --config extensions.x=../changefileslist.py
+  $ hg log -r . -T '{node|short} {files|json}\n'
+  c085bbe93d59 ["a"]
+
+Now that we have a commit with a files list that's not what the
+current hg version would create, check that convert either fixes it or
+keeps it depending on config:
+
+  $ hg convert -q . ../convert
+  $ hg --cwd ../convert log -r tip -T '{node|short} {files|json}\n'
+  b7c4d4bbacd3 []
+  $ rm -rf ../convert
+
+  $ hg convert -q . ../convert --config convert.hg.preserve-hash=true
+  $ hg --cwd ../convert log -r tip -T '{node|short} {files|json}\n'
+  c085bbe93d59 ["a"]
+  $ rm -rf ../convert