Final running order for 2019 FOSDEM talk.

diff --git a/2019-fosdem/.gitignore b/2019-fosdem/.gitignore
index 349864b..aa996d7 100644 (file)
--- a/2019-fosdem/.gitignore
+++ b/2019-fosdem/.gitignore
@@ -6,6 +6,7 @@
 /2200-partitioning.d/.root.img
 /2200-partitioning.d/root.img
 /2200-partitioning.d/swap.img
+/6500-shell.d/tar2iso.sh
 /nbdview/error?
 /nbdview/log?
 /nbdview/sock?
\ No newline at end of file

diff --git a/2019-fosdem/6000-plugins.html b/2019-fosdem/6000-plugins.html
new file mode 100644 (file)
index 0000000..acd95ba
--- /dev/null
+++ b/2019-fosdem/6000-plugins.html
@@ -0,0 +1,42 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Writing plugins</h1>
+
+<!-- note: div must have position: relative so child elements position
+     is correct -->
+<div style="background: #ccf; border: 1px solid rgb(204,0,0);
+            position:relative;
+            width: 800px; height: 400px;">
+  <code style="position: absolute; top: 1px; left: 10px;">curl</code>
+  <code style="position: absolute; top: 50px; left: 20px;">data</code>
+  <code style="position: absolute; top: 100px; left: 10px;">ext2</code>
+  <code style="position: absolute; top: 120px; left: 140px;">file</code>
+  <code style="position: absolute; top: 150px; left: 10px;">floppy</code>
+  <code style="position: absolute; top: 200px; left: 20px;">guestfs</code>
+  <code style="position: absolute; top: 250px; left: 10px;">gzip</code>
+  <code style="position: absolute; top: 280px; left: 150px;">iso</code>
+  <code style="position: absolute; top: 350px; left: 10px;">libvirt</code>
+
+  <code style="position: absolute; top: 5px; left: 340px;">lua</code>
+  <code style="position: absolute; top: 55px; left: 380px;">memory</code>
+  <code style="position: absolute; top: 105px; left: 340px;">nbd</code>
+  <code style="position: absolute; top: 125px; left: 450px;">null</code>
+  <code style="position: absolute; top: 155px; left: 340px;">ocaml</code>
+  <code style="position: absolute; top: 185px; left: 160px;">partitioning</code>
+  <code style="position: absolute; top: 240px; left: 380px;">pattern</code>
+  <code style="position: absolute; top: 300px; left: 320px;">perl</code>
+  <code style="position: absolute; top: 340px; left: 280px;">python</code>
+
+  <code style="position: absolute; top: 10px; left: 600px;">random</code>
+  <code style="position: absolute; top: 60px; left: 600px;">ruby</code>
+  <code style="position: absolute; top: 90px; left: 700px;">sh</code>
+  <code style="position: absolute; top: 130px; left: 590px;">split</code>
+  <code style="position: absolute; top: 180px; left: 600px;">streaming</code>
+  <code style="position: absolute; top: 190px; left: 450px;">tar</code>
+  <code style="position: absolute; top: 230px; left: 580px;">tcl</code>
+  <code style="position: absolute; top: 260px; left: 650px;">vddk</code>
+  <code style="position: absolute; top: 290px; left: 600px;">xz</code>
+  <code style="position: absolute; top: 320px; left: 600px;">zero</code>
+</div>

diff --git a/2019-fosdem/6100-plugins-c.html b/2019-fosdem/6100-plugins-c.html
new file mode 100644 (file)
index 0000000..d2685e5
--- /dev/null
+++ b/2019-fosdem/6100-plugins-c.html
@@ -0,0 +1,155 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Writing plugins in C?</h1>
+
+<style>
+pre {
+    column-count: 3;
+    font-size: 50%;
+}
+</style>
+
+<pre>
+/* The size of disk in bytes (initialized by
+   size=&lt;SIZE&gt; parameter). */
+static int64_t size = 0;
+
+/* Debug directory operations
+   (-D memory.dir=1). */
+int memory_debug_dir;
+
+static struct sparse_array *sa;
+
+static void
+memory_load (void)
+{
+  sa = alloc_sparse_array (memory_debug_dir);
+  if (sa == NULL) {
+    perror ("malloc");
+    exit (EXIT_FAILURE);
+  }
+}
+
+static void
+memory_unload (void)
+{
+  free_sparse_array (sa);
+}
+
+static int
+memory_config (const char *key,
+               const char *value)
+{
+  if (strcmp (key, "size") == 0) {
+    size = nbdkit_parse_size (value);
+    if (size == -1)
+      return -1;
+  }
+  else {
+    nbdkit_error
+      ("unknown parameter '%s'", key);
+    return -1;
+  }
+
+  return 0;
+}
+
+static int
+memory_config_complete (void)
+{
+  if (size == 0) {
+    nbdkit_error ("you must specify "
+      "size=&lt;SIZE&gt; on the "
+      "command line");
+    return -1;
+  }
+  return 0;
+}
+
+#define memory_config_help \
+  "size=&lt;SIZE&gt;  (required)"
+  " Size of the backing disk"
+
+/* Create the per-connection handle. */
+static void *
+memory_open (int readonly)
+{
+  /* Used only as a handle pointer. */
+  static int mh;
+
+  return &amp;mh;
+}
+
+#define THREAD_MODEL \
+NBDKIT_THREAD_MODEL_SERIALIZE_ALL_REQUESTS
+
+/* Get the disk size. */
+static int64_t
+memory_get_size (void *handle)
+{
+  return (int64_t) size;
+}
+
+/* Read data. */
+static int
+memory_pread (void *handle, void *buf,
+              uint32_t count, uint64_t offset)
+{
+  sparse_array_read (sa, buf, count, offset);
+  return 0;
+}
+
+/* Write data. */
+static int
+memory_pwrite (void *handle,
+               const void *buf,
+               uint32_t count, uint64_t offset)
+{
+  return sparse_array_write (sa,
+    buf, count, offset);
+}
+
+/* Zero. */
+static int
+memory_zero (void *handle,
+             uint32_t count,
+             uint64_t offset, int may_trim)
+{
+  sparse_array_zero (sa, count, offset);
+  return 0;
+}
+
+/* Trim (same as zero). */
+static int
+memory_trim (void *handle,
+             uint32_t count, uint64_t offset)
+{
+  sparse_array_zero (sa, count, offset);
+  return 0;
+}
+
+static struct nbdkit_plugin plugin = {
+  .name              = "memory",
+  .version           = PACKAGE_VERSION,
+  .load              = memory_load,
+  .unload            = memory_unload,
+  .config            = memory_config,
+  .config_complete   = memory_config_complete,
+  .config_help       = memory_config_help,
+  .open              = memory_open,
+  .get_size          = memory_get_size,
+  .pread             = memory_pread,
+  .pwrite            = memory_pwrite,
+  .zero              = memory_zero,
+  .trim              = memory_trim,
+  /* In this plugin, errno is preserved
+   * properly along error return
+   * paths from failed system calls.
+   */
+  .errno_is_preserved = 1,
+};
+
+NBDKIT_REGISTER_PLUGIN(plugin)
+</pre>

diff --git a/2019-fosdem/6200-plugin-langs.html b/2019-fosdem/6200-plugin-langs.html
new file mode 100644 (file)
index 0000000..97a7799
--- /dev/null
+++ b/2019-fosdem/6200-plugin-langs.html
@@ -0,0 +1,51 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Writing plugins in other languages</h1>
+
+<style>
+b {
+    border: 1px solid rgb(204,0,0);
+    background: #eef;
+    padding: 5px;
+    border-radius: 15px;
+}
+</style>
+
+<!-- note: div must have position: relative so child elements position
+     is correct -->
+<div style="background: #ccf; border: 1px solid rgb(204,0,0);
+            position:relative;
+            width: 800px; height: 400px;">
+  <code style="position: absolute; top: 1px; left: 10px;">curl</code>
+  <code style="position: absolute; top: 50px; left: 20px;">data</code>
+  <code style="position: absolute; top: 100px; left: 10px;">ext2</code>
+  <code style="position: absolute; top: 120px; left: 140px;">file</code>
+  <code style="position: absolute; top: 150px; left: 10px;">floppy</code>
+  <code style="position: absolute; top: 200px; left: 20px;">guestfs</code>
+  <code style="position: absolute; top: 250px; left: 10px;">gzip</code>
+  <code style="position: absolute; top: 280px; left: 150px;">iso</code>
+  <code style="position: absolute; top: 350px; left: 10px;">libvirt</code>
+
+  <code style="position: absolute; top: 5px; left: 340px;"><b>lua</b></code>
+  <code style="position: absolute; top: 55px; left: 380px;">memory</code>
+  <code style="position: absolute; top: 105px; left: 340px;">nbd</code>
+  <code style="position: absolute; top: 125px; left: 450px;">null</code>
+  <code style="position: absolute; top: 155px; left: 340px;"><b>ocaml</b></code>
+  <code style="position: absolute; top: 185px; left: 160px;">partitioning</code>
+  <code style="position: absolute; top: 240px; left: 380px;">pattern</code>
+  <code style="position: absolute; top: 300px; left: 320px;"><b>perl</b></code>
+  <code style="position: absolute; top: 340px; left: 280px;"><b>python</b></code>
+
+  <code style="position: absolute; top: 10px; left: 600px;">random</code>
+  <code style="position: absolute; top: 60px; left: 600px;"><b>ruby</b></code>
+  <code style="position: absolute; top: 90px; left: 700px;"><b>sh</b></code>
+  <code style="position: absolute; top: 130px; left: 590px;">split</code>
+  <code style="position: absolute; top: 180px; left: 600px;">streaming</code>
+  <code style="position: absolute; top: 190px; left: 450px;">tar</code>
+  <code style="position: absolute; top: 230px; left: 580px;"><b>tcl</b></code>
+  <code style="position: absolute; top: 260px; left: 650px;">vddk</code>
+  <code style="position: absolute; top: 290px; left: 600px;">xz</code>
+  <code style="position: absolute; top: 320px; left: 600px;">zero</code>
+</div>

diff --git a/2019-fosdem/6300-plugins-shell.html b/2019-fosdem/6300-plugins-shell.html
new file mode 100644 (file)
index 0000000..eb384a7
--- /dev/null
+++ b/2019-fosdem/6300-plugins-shell.html
@@ -0,0 +1,6 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Writing plugins in shell script</h1>
+

diff --git a/2019-fosdem/6400-plugins-shell-2.html b/2019-fosdem/6400-plugins-shell-2.html
new file mode 100644 (file)
index 0000000..5c2e981
--- /dev/null
+++ b/2019-fosdem/6400-plugins-shell-2.html
@@ -0,0 +1,23 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>Writing plugins in shell script</h1>
+
+<p>
+(Or <u>any</u> language).
+We only need to write a few callbacks ...
+</p>
+
+<ul>
+<li> <code>config</code>
+<li> <code>config_complete</code>
+<li> <code>open</code>
+<li> <code>get_size</code>
+<li> <code>pread</code>
+<li> <code>pwrite</code>
+</ul>
+
+<p>
+Almost all callbacks are optional.
+</p>

diff --git a/2019-fosdem/6450-cd.svg b/2019-fosdem/6450-cd.svg
new file mode 100644 (file)
index 0000000..881455e
--- /dev/null
+++ b/2019-fosdem/6450-cd.svg
@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="192" height="192" viewBox="0 0 144 144">
+  <linearGradient id="c" x1="15.193" x2="120.855" y1="77.313" y2="77.313" gradientUnits="userSpaceOnUse">
+    <stop offset="0" stop-color="#fff"/>
+    <stop offset="1"/>
+  </linearGradient>
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+    <stop offset=".011" stop-color="#98aff2"/>
+    <stop offset=".096" stop-color="#9db3f3"/>
+    <stop offset=".199" stop-color="#acbff5"/>
+    <stop offset=".31" stop-color="#c4d2f8"/>
+    <stop offset=".428" stop-color="#e6ecfc"/>
+    <stop offset=".5" stop-color="#fff"/>
+    <stop offset=".519" stop-color="#f7f9fe"/>
+    <stop offset=".611" stop-color="#d5defa"/>
+    <stop offset=".704" stop-color="#bacaf6"/>
+    <stop offset=".799" stop-color="#a7bbf4"/>
+    <stop offset=".897" stop-color="#9cb2f2"/>
+    <stop offset="1" stop-color="#98aff2"/>
+  </linearGradient>
+  <linearGradient id="a">
+    <stop offset=".011" stop-color="#b1caff"/>
+    <stop offset=".111" stop-color="#b6cdff"/>
+    <stop offset=".232" stop-color="#c5d8ff"/>
+    <stop offset=".363" stop-color="#dde8ff"/>
+    <stop offset=".5" stop-color="#fff"/>
+    <stop offset=".526" stop-color="#f8faff"/>
+    <stop offset=".64" stop-color="#dde6ff"/>
+    <stop offset=".755" stop-color="#cad8ff"/>
+    <stop offset=".874" stop-color="#bfd0ff"/>
+    <stop offset="1" stop-color="#bbcdff"/>
+  </linearGradient>
+  <linearGradient id="e" x1="1065.43" x2="1158.018" y1="95.011" y2="2.423" gradientTransform="matrix(.849 -.5284 .5284 .849 -910.0727 618.7241)" gradientUnits="userSpaceOnUse" xlink:href="#a"/>
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+  <linearGradient id="g" x1="75.36" x2="167.626" y1="92.327" y2="241.508" gradientUnits="userSpaceOnUse">
+    <stop offset="0" stop-color="#fff"/>
+    <stop offset="1" stop-color="#9195f2"/>
+  </linearGradient>
+  <linearGradient id="b">
+    <stop offset="0" stop-color="#9ab1ff"/>
+    <stop offset="1" stop-color="#444973"/>
+  </linearGradient>
+  <linearGradient id="h" x1="14.187" x2="117.257" y1="76.693" y2="76.693" gradientUnits="userSpaceOnUse" xlink:href="#b"/>
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+  </linearGradient>
+  <g fill="#fff" stroke-width="0">
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+    <path fill="url(#g)" d="m24.177 102.612c17.497 28.113 50.368 39.383 73.28 25.122 22.91-14.259 27.316-48.731 9.819-76.844-17.497-28.111-50.372-39.381-73.282-25.122-22.912 14.261-27.314 48.732-9.817 76.844zm80.552-50.136c16.623 26.707 12.649 59.326-8.857 72.711-8.838 5.501-19.872 7.095-31.069 4.489-15.048-3.502-28.927-13.944-38.079-28.649-16.623-26.707-12.65-59.326 8.856-72.711s52.526-2.547 69.149 24.161z"/>
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+</svg>

diff --git a/2019-fosdem/6450-plugins-shell-what.html b/2019-fosdem/6450-plugins-shell-what.html
new file mode 100644 (file)
index 0000000..a1ea8ea
--- /dev/null
+++ b/2019-fosdem/6450-plugins-shell-what.html
@@ -0,0 +1,9 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>What shell script?</h1>
+
+<img src="6450-tarfile.svg" width="300">
+
+<img src="6450-cd.svg" width="300">

diff --git a/2019-fosdem/6450-tarfile.svg b/2019-fosdem/6450-tarfile.svg
new file mode 100644 (file)
index 0000000..ae57d1a
--- /dev/null
+++ b/2019-fosdem/6450-tarfile.svg
@@ -0,0 +1,251 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
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diff --git a/2019-fosdem/6500-shell-next b/2019-fosdem/6500-shell-next
new file mode 100755 (executable)
index 0000000..0fd1dd0
--- /dev/null
+++ b/2019-fosdem/6500-shell-next
@@ -0,0 +1,21 @@
+#!/bin/bash -
+
+source functions
+
+# Title.
+export title="Writing tar2iso.sh"
+
+# History.
+remember 'emacs tar2iso.sh &'
+remember 'nbdkit sh ./tar2iso.sh file=~/nbdkit-1.9.0.tar.gz'
+remember 'sudo nbd-client -b 512 localhost /dev/nbd0'
+remember 'sudo mount /dev/nbd0 /tmp/mnt'
+
+./restore
+pushd 6500-shell.d >/dev/null
+rm -f tar2iso.sh
+echo '#!/bin/bash' > tar2iso.sh
+echo >> tar2iso.sh
+chmod +x tar2iso.sh
+terminal
+popd >/dev/null

diff --git a/2019-fosdem/6500-shell.d/.stamp b/2019-fosdem/6500-shell.d/.stamp
new file mode 100644 (file)
index 0000000..e69de29

diff --git a/2019-fosdem/6500-shell.sh b/2019-fosdem/6500-shell.sh
new file mode 100755 (executable)
index 0000000..9290481
--- /dev/null
+++ b/2019-fosdem/6500-shell.sh
@@ -0,0 +1,4 @@
+#!/bin/bash -
+
+xfce4-terminal --disable-server \
+               -x ./6500-shell-next

diff --git a/2019-fosdem/9000-final.html b/2019-fosdem/9000-final.html
new file mode 100644 (file)
index 0000000..e4e1c8c
--- /dev/null
+++ b/2019-fosdem/9000-final.html
@@ -0,0 +1,17 @@
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
+<link rel="stylesheet" href="style.css" type="text/css"/>
+<script src="code.js" type="text/javascript"></script>
+
+<h1>In summary</h1>
+
+<ul>
+<li> Loopback mounts &mdash; don't do much.
+<li> Loopback mounts with NBD and nbdkit &mdash; infinitely flexible.
+<li> Lots of plugins, or write your own.
+<li> nbdkit 1.8 now available in all major Linux distros.
+<li> <a href="https://github.com/libguestfs/nbdkit">https://github.com/libguestfs/nbdkit</a>
+<li> This talk: <a href="http://git.annexia.org/?p=libguestfs-talks.git">http://git.annexia.org/?p=libguestfs-talks.git</a>
+<li> This presentation software: Tech Talk PSE 1.2
+</ul>
+
+<h2>Any Questions?</h2>

diff --git a/2019-fosdem/style.css b/2019-fosdem/style.css
index aa57add..1f66f13 100644 (file)
--- a/2019-fosdem/style.css
+++ b/2019-fosdem/style.css
@@ -23,6 +23,13 @@ h1 {
     border-bottom: 2px solid rgb(204,0,0);
 }
 
+h2 {
+    color: rgb(204,0,0);
+    font-size: 32px;
+    font-style: italic;
+    border-bottom: 2px solid rgb(204,0,0);
+}
+
 b {
     color: rgb(204,0,0);
 }

diff --git a/2019-fosdem/tar2iso.sh b/2019-fosdem/tar2iso.sh
new file mode 100755 (executable)
index 0000000..dc4a3b4
--- /dev/null
+++ b/2019-fosdem/tar2iso.sh
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+case "$1" in
+    config)
+        [ "$2" = "file" ] && ln -sf "$3" $tmpdir/tarfile  ;;
+    config_complete)
+        tar zxf $tmpdir/tarfile -C $tmpdir
+        rm $tmpdir/tarfile
+        mkisofs -JrT -o $tmpdir/iso $tmpdir ;;
+    open) ;;
+    get_size)
+        stat -c '%s' $tmpdir/iso ;;
+    pread)
+        dd iflag=skip_bytes,count_bytes skip=$4 count=$3 if=$tmpdir/iso ;;
+    *) exit 2 ;;
+esac