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diff mercurial/upgrade.py @ 46235:0babe12ef35d

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sharesafe: introduce functionality to automatically upgrade shares In past few months, we have developed a `share-safe` mode for sharing repository in which share source requirements and config values are shared with the shares. To get it rolling, an important task is to get these shares automatically upgraded. We are focusing on an installation where shares are created by scripts and test jobs. It will be difficult to manually upgrade these and we need some functionality to do so automatically. This patch introduces a config option to deal with it. If all of the following conditions are met, we upgrade the share repository automatically: * If the config option is enabled * Share source repository is share-safe enabled * Share is not share-safe enabled * Any command is run in the share Upgrading the share is pretty easy as it involves only editing the requirements file. Differential Revision: https://phab.mercurial-scm.org/D9679
author Pulkit Goyal <7895pulkit@gmail.com>
date Wed, 06 Jan 2021 16:18:06 +0530
parents d3113c4cf52c
children eec47efe219d
line wrap: on
line diff
--- a/mercurial/upgrade.py	Wed Jan 06 16:01:19 2021 +0530
+++ b/mercurial/upgrade.py	Wed Jan 06 16:18:06 2021 +0530
@@ -12,7 +12,10 @@
     error,
     hg,
     localrepo,
+    lock as lockmod,
     pycompat,
+    requirements as requirementsmod,
+    scmutil,
 )
 
 from .upgrade_utils import (
@@ -20,6 +23,10 @@
     engine as upgrade_engine,
 )
 
+from .utils import (
+    stringutil,
+)
+
 allformatvariant = upgrade_actions.allformatvariant
 
 
@@ -232,3 +239,28 @@
                 )
 
             upgrade_op.print_post_op_messages()
+
+
+def upgrade_share_to_safe(ui, hgvfs, storevfs, current_requirements):
+    """Upgrades a share to use share-safe mechanism"""
+    wlock = None
+    try:
+        wlock = lockmod.trylock(ui, hgvfs, b'wlock', 0, 0)
+        store_requirements = localrepo._readrequires(storevfs, False)
+        # after upgrade, store requires will be shared, so lets find
+        # the requirements which are not present in store and
+        # write them to share's .hg/requires
+        diffrequires = current_requirements - store_requirements
+        # add share-safe requirement as it will mark the share as share-safe
+        diffrequires.add(requirementsmod.SHARESAFE_REQUIREMENT)
+        scmutil.writerequires(hgvfs, diffrequires)
+        current_requirements.add(requirementsmod.SHARESAFE_REQUIREMENT)
+        ui.warn(_(b'repository upgraded to use share-safe mode\n'))
+    except error.LockError as e:
+        ui.warn(
+            _(b'failed to upgrade share, got error: %s\n')
+            % stringutil.forcebytestr(e.strerror)
+        )
+    finally:
+        if wlock:
+            wlock.release()