upstream/mercurial-mirror Files · mercurial/templates/paper/helptopics.tmpl

revlog: add a mechanism to verify expected file position before appending...

revlog: add a mechanism to verify expected file position before appending If someone uses `hg debuglocks`, or some non-hg process writes to the .hg directory without respecting the locks, or if the repo's on a networked filesystem, it's possible for the revlog code to write out corrupted data. The form of this corruption can vary depending on what data was written and how that happened. We are in the "networked filesystem" case (though I've had users also do this to themselves with the "`hg debuglocks`" scenario), and most often see this with the changelog. What ends up happening is we produce two items (let's call them rev1 and rev2) in the .i file that have the same linkrev, baserev, and offset into the .d file, while the data in the .d file is appended properly. rev2's compressed_size is accurate for rev2, but when we go to decompress the data in the .d file, we use the offset that's recorded in the index file, which is the same as rev1, and attempt to decompress rev2.compressed_size bytes of rev1's data. This usually does not succeed. :) When using inline data, this also fails, though I haven't investigated why too closely. This shows up as a "patch decode" error. I believe what's happening there is that we're basically ignoring the offset field, getting the data properly, but since baserev != rev, it thinks this is a delta based on rev (instead of a full text) and can't actually apply it as such. For now, I'm going to make this an optional component and default it to entirely off. I may increase the default severity of this in the future, once I've enabled it for my users and we gain more experience with it. Luckily, most of my users have a versioned filesystem and can roll back to before the corruption has been written, it's just a hassle to do so and not everyone knows how (so it's a support burden). Users on other filesystems will not have that luxury, and this can cause them to have a corrupted repository that they are unlikely to know how to resolve, and they'll see this as a data-loss event. Refusing to create the corruption is a much better user experience. This mechanism is not perfect. There may be false-negatives (racy writes that are not detected). There should not be any false-positives (non-racy writes that are detected as such). This is not a mechanism that makes putting a repo on a networked filesystem "safe" or "supported", just *less* likely to cause corruption. Differential Revision: https://phab.mercurial-scm.org/D9952

Gregory Szorc - - Load All Authors

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        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      {header}

      <title>Help: {title}</title>

      </head>

      <body>

      <div class="container">

      <div class="menu">

      <div class="logo">

        Steven Stallion
    
hgweb: support alternate logo url...

              r13964
            
      <a href="{logourl}">

        Thomas Arendsen Hein
    
hgweb: urlescape all urls, HTML escape repo/tag/branch/... names...

              r18526
            
      <img src="{staticurl|urlescape}{logoimg}" alt="mercurial" /></a>

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      </div>

      <ul>

        Thomas Arendsen Hein
    
hgweb: urlescape all urls, HTML escape repo/tag/branch/... names...

              r18526
            
      <li><a href="{url|urlescape}shortlog{sessionvars%urlparameter}">log</a></li>

      <li><a href="{url|urlescape}graph{sessionvars%urlparameter}">graph</a></li>

      <li><a href="{url|urlescape}tags{sessionvars%urlparameter}">tags</a></li>

      <li><a href="{url|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a></li>

      <li><a href="{url|urlescape}branches{sessionvars%urlparameter}">branches</a></li>

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      </ul>

      <ul>

        Gregory Szorc
    
templates: support linking to main help page...

              r27580
            
      {if(subindex,

        '<li><a href="{url|urlescape}help{sessionvars%urlparameter}">help</a></li>',

        '<li class="active">help</li>'

      )}

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      </ul>

      </div>

      <div class="main">

        Angel Ezquerra <angel.ezquerra at gmail.com>
    
hgweb: add a "URL breadcrumb" to the index and repository pages...

              r18258
            
      <h2 class="breadcrumb"><a href="/">Mercurial</a> {pathdef%breadcrumb}</h2>

        Gregory Szorc
    
hgweb: consolidate search form for paper...

              r32758
            
      {searchform}

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      <table class="bigtable">

        av6
    
hgweb: make anchor name actually match its href on help index page

              r30019
            
      <tr><td colspan="2"><h2><a name="topics" href="#topics">Topics</a></h2></td></tr>

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      {topics % helpentry}

        Gregory Szorc
    
templates: make earlycommands and othercommands optional...

              r27578
            
      {if(earlycommands, '

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      <tr><td colspan="2"><h2><a name="main" href="#main">Main Commands</a></h2></td></tr>

      {earlycommands % helpentry}

        Gregory Szorc
    
templates: make earlycommands and othercommands optional...

              r27578
            
      ')}

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
        Gregory Szorc
    
templates: make earlycommands and othercommands optional...

              r27578
            
      {if(othercommands, '

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      <tr><td colspan="2"><h2><a name="other" href="#other">Other Commands</a></h2></td></tr>

      {othercommands % helpentry}

        Gregory Szorc
    
templates: make earlycommands and othercommands optional...

              r27578
            
      ')}

        Augie Fackler
    
web: add a help view for getting hg help output

              r12666
            
      </table>

      </div>

      </div>

      {footer}

	Site-wide shortcuts
/	Use quick search box
g h	Goto home page
g g	Goto my private gists page
g G	Goto my public gists page
g 0-9	Goto bookmarked items from 0-9
n r	New repository page
n g	New gist page

	Repositories
g s	Goto summary page
g c	Goto changelog page
g f	Goto files page
g F	Goto files page with file search activated
g p	Goto pull requests page
g o	Goto repository settings
g O	Goto repository access permissions settings
t s	Toggle sidebar on some pages

Augie Fackler web: add a help view for getting hg help output	r12666	{header}
		<title>Help: {title}</title>
		</head>
		<body>

		<div class="container">
		<div class="menu">
		<div class="logo">
Steven Stallion hgweb: support alternate logo url...	r13964	<a href="{logourl}">
Thomas Arendsen Hein hgweb: urlescape all urls, HTML escape repo/tag/branch/... names...	r18526	<img src="{staticurl\|urlescape}{logoimg}" alt="mercurial" /></a>
Augie Fackler web: add a help view for getting hg help output	r12666	</div>
		<ul>
Thomas Arendsen Hein hgweb: urlescape all urls, HTML escape repo/tag/branch/... names...	r18526	<li><a href="{url\|urlescape}shortlog{sessionvars%urlparameter}">log</a></li>
		<li><a href="{url\|urlescape}graph{sessionvars%urlparameter}">graph</a></li>
		<li><a href="{url\|urlescape}tags{sessionvars%urlparameter}">tags</a></li>
		<li><a href="{url\|urlescape}bookmarks{sessionvars%urlparameter}">bookmarks</a></li>
		<li><a href="{url\|urlescape}branches{sessionvars%urlparameter}">branches</a></li>
Augie Fackler web: add a help view for getting hg help output	r12666	</ul>
		<ul>
Gregory Szorc templates: support linking to main help page...	r27580	{if(subindex,
		'<li><a href="{url\|urlescape}help{sessionvars%urlparameter}">help</a></li>',
		'<li class="active">help</li>'
		)}
Augie Fackler web: add a help view for getting hg help output	r12666	</ul>
		</div>

		<div class="main">
Angel Ezquerra <angel.ezquerra at gmail.com> hgweb: add a "URL breadcrumb" to the index and repository pages...	r18258	<h2 class="breadcrumb"><a href="/">Mercurial</a> {pathdef%breadcrumb}</h2>
Gregory Szorc hgweb: consolidate search form for paper...	r32758	{searchform}
Augie Fackler web: add a help view for getting hg help output	r12666	<table class="bigtable">
av6 hgweb: make anchor name actually match its href on help index page	r30019	<tr><td colspan="2"><h2><a name="topics" href="#topics">Topics</a></h2></td></tr>
Augie Fackler web: add a help view for getting hg help output	r12666	{topics % helpentry}

Gregory Szorc templates: make earlycommands and othercommands optional...	r27578	{if(earlycommands, '
Augie Fackler web: add a help view for getting hg help output	r12666	<tr><td colspan="2"><h2><a name="main" href="#main">Main Commands</a></h2></td></tr>
		{earlycommands % helpentry}
Gregory Szorc templates: make earlycommands and othercommands optional...	r27578	')}
Augie Fackler web: add a help view for getting hg help output	r12666
Gregory Szorc templates: make earlycommands and othercommands optional...	r27578	{if(othercommands, '
Augie Fackler web: add a help view for getting hg help output	r12666	<tr><td colspan="2"><h2><a name="other" href="#other">Other Commands</a></h2></td></tr>
		{othercommands % helpentry}
Gregory Szorc templates: make earlycommands and othercommands optional...	r27578	')}

Augie Fackler web: add a help view for getting hg help output	r12666	</table>
		</div>
		</div>

		{footer}