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diff --git a/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/new/1455999010.M15391P17339Q202.exolobe1 b/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/new/1455999010.M15391P17339Q202.exolobe1
new file mode 100644
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--- /dev/null
+++ b/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/new/1455999010.M15391P17339Q202.exolobe1
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+Subject: Fwd: how to test failure with yarn ?
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+This is a multi-part message in MIME format.
+--------------090702000209000008050509
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+
+Ooops sorry,
+I guess the dev mailing list was more appropriated for this.
+
+regards,
+Damien
+
+
+-------- Message transféré --------
+Sujet : how to test failure with yarn ?
+Date : Mon, 24 Nov 2014 22:36:03 +0100
+De : Damien Couroussé <damien.courousse@gmail.com>
+Pour : obnam <obnam@flarn.net>
+
+While trying to chase the "Value Error" bug that I still sometimes
+experience, I considered implementing some yarn tests for the "full
+filesystem" test case [1].
+
+As far as I understand this test case however, I would need to have
+obnam fail a backup at some point, which does not seem to be supported
+in yarn yet. Is it possible ?
+
+Please find attached a draft attempt of implementation with yarn.
+It produces the following :
+
+
+$ yarn -s yarns/obnam.sh yarns/9000-implements.yarn
+yarns/0030-basics.yarn  -r "Backup over a full disk"
+ERROR: In scenario "Backup over a full disk"
+
+step "THEN user U fails the backup of directory L to repository R" failed,
+with exit code 1:
+
+(...)
+    ERROR: Can't back up
+/tmp/tmpqgZNqF/Backup_over_a_full_disk/datadir/L/0/0/0/39: RCE08AX: I/O
+error: /tmp/tmpqgZNqF/Backup_over_a_full_disk/datadir/L/0/0/0/39: 28: No
+space left on device
+    ERROR: RCE08AX: I/O error: None: 28: No space left on device
+
+>>> this error is expected
+
+
+ERROR: Test suite FAILED in 1 scenarios
+
+>>> However I would expect the test _not_ to fail :)
+
+
+regards,
+Damien
+
+[1] http://obnam.org/bugs/test-for-full-filesystem/
+
+
+
+
+
+
+--------------090702000209000008050509
+Content-Type: text/x-patch;
+ name="0001-wip.patch"
+Content-Transfer-Encoding: 8bit
+Content-Disposition: attachment;
+ filename="0001-wip.patch"
+
+>From 51d12e91ddcc7aafd788bde9e5ccfd11ffb0f9cb Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Damien=20Courouss=C3=A9?= <damien.courousse@gmail.com>
+Date: Sun, 23 Nov 2014 16:22:01 +0100
+Subject: [PATCH] wip
+
+---
+ yarns/0030-basics.yarn     | 28 ++++++++++++++++++++++++++++
+ yarns/9000-implements.yarn | 28 ++++++++++++++++++++++++++++
+ yarns/obnam.sh             | 13 +++++++++++++
+ 3 files changed, 69 insertions(+)
+
+diff --git a/yarns/0030-basics.yarn b/yarns/0030-basics.yarn
+index 4bc8439..0711e42 100644
+--- a/yarns/0030-basics.yarn
++++ b/yarns/0030-basics.yarn
+@@ -313,3 +313,31 @@ setting to a new size, the backup should still work.
+     AND user U restores their latest generation in repository R into X
+     THEN L, restored to X, matches manifest M
+     AND user U can fsck the repository R
++
++Backup over a full disk
++-----------------------
++
++If the backup destination went full, there should be a safe way to access the
++generations that were previously correctly backuped. Obnam commands over this
++backup repository should (at least) return correct error statements.
++
++    SCENARIO Backup over a full disk
++    ASSUMING user has permissions to create and mount disk images
++    GIVEN 100kB of new data in directory L
++    AND a manifest of L in G1
++    AND a volume V of total size 1MB mounted to R
++    WHEN user U backs up directory L to repository R
++    GIVEN 1MB of new data in directory L
++    THEN user U fails the backup of directory L to repository R
++    WHEN user U restores generation 1 to R1 from repository R
++    THEN L, restored to R1, matches manifest G1
++	FINALLY umount R
++
++Points to solve
+++ how to test failure for the second backup without aborting with an error?
+++ how to create, and later delete, data in repository R?
++
+++ testing failure for the second backup
+++ autre solution: créer de nouvelles data avant le 2e backup, pour remplir le disque,
++  + puis supprimer les data
++  + obnam devrait fonctionner
+diff --git a/yarns/9000-implements.yarn b/yarns/9000-implements.yarn
+index 1a86fbe..7a9788e 100644
+--- a/yarns/9000-implements.yarn
++++ b/yarns/9000-implements.yarn
+@@ -619,6 +619,34 @@ often is disabled on build servers.
+     touch "$DATADIR/xattr.test"
+     setfattr -n user.foo -v bar "$DATADIR/xattr.test"
+ 
++Check on whether user can create and mount volume images
++--------------------------------------------------------
++
++    IMPLEMENTS ASSUMING user has permissions to create and mount disk images
++    echo "TODO" 1>&2
++    exit 0
++
++    IMPLEMENTS GIVEN a volume (\S+) of total size (\S+) mounted to (\S+)
++    echo "volume name: $DATADIR/$MATCH_1" 1>&2
++    echo "size: $MATCH_2" 1>&2
++    create_disk "$DATADIR/$MATCH_1" "$MATCH_2"
++    mkdir -p "$DATADIR/$MATCH_3"
++    sudo mount -o loop,users,defaults "$DATADIR/$MATCH_1" "$DATADIR/$MATCH_3"
++    sudo chmod 777 "$DATADIR/$MATCH_3"
++
++    IMPLEMENTS WHEN fail here
++    exit 1
++
++	IMPLEMENTS FINALLY umount (\S+)
++    sudo -u root umount "$DATADIR/$MATCH_1"
++
++This backup is expected to fail.
++
++    IMPLEMENTS THEN user (\S+) fails the backup of directory (\S+) to repository (\S+)
++    run_obnam "$MATCH_1" backup -r "$DATADIR/$MATCH_3" "$DATADIR/$MATCH_2"
++	exit 0
++
++
+ 
+ Nagios
+ ------
+diff --git a/yarns/obnam.sh b/yarns/obnam.sh
+index 0792bce..4bca356 100644
+--- a/yarns/obnam.sh
++++ b/yarns/obnam.sh
+@@ -192,6 +192,19 @@ get_keyid()
+ }
+ 
+ 
++# Create a disk image
++create_disk()
++{
++    local DISK="$1"
++    local SIZE="$2"
++    local DEV=`sudo losetup -f`
++    dd if=/dev/zero of="$DISK" bs=1 count=0 seek="$SIZE"
++    sudo losetup "$DEV" "$DISK"
++    sudo mkfs.ext3 "$DEV"
++    sudo losetup -d "$DEV"
++}
++
++
+ # Create a dummy $HOME that actually exists.
+ export HOME="$DATADIR/home"
+ mkdir -p "$HOME"
+-- 
+2.1.0
+
+
+
+--------------090702000209000008050509
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+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
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+
+--------------090702000209000008050509--
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diff --git a/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/new/1455999010.M475156P17339Q205.exolobe1 b/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/new/1455999010.M475156P17339Q205.exolobe1
new file mode 100644
index 0000000..2364b29
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+++ b/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/new/1455999010.M475156P17339Q205.exolobe1
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+Subject: Fwd: how to test failure with yarn ?
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+
+This is a multi-part message in MIME format.
+--------------090702000209000008050509
+Content-Type: text/plain; charset=utf-8
+Content-Transfer-Encoding: 8bit
+
+Ooops sorry,
+I guess the dev mailing list was more appropriated for this.
+
+regards,
+Damien
+
+
+-------- Message transféré --------
+Sujet : how to test failure with yarn ?
+Date : Mon, 24 Nov 2014 22:36:03 +0100
+De : Damien Couroussé <damien.courousse@gmail.com>
+Pour : obnam <obnam@flarn.net>
+
+While trying to chase the "Value Error" bug that I still sometimes
+experience, I considered implementing some yarn tests for the "full
+filesystem" test case [1].
+
+As far as I understand this test case however, I would need to have
+obnam fail a backup at some point, which does not seem to be supported
+in yarn yet. Is it possible ?
+
+Please find attached a draft attempt of implementation with yarn.
+It produces the following :
+
+
+$ yarn -s yarns/obnam.sh yarns/9000-implements.yarn
+yarns/0030-basics.yarn  -r "Backup over a full disk"
+ERROR: In scenario "Backup over a full disk"
+
+step "THEN user U fails the backup of directory L to repository R" failed,
+with exit code 1:
+
+(...)
+    ERROR: Can't back up
+/tmp/tmpqgZNqF/Backup_over_a_full_disk/datadir/L/0/0/0/39: RCE08AX: I/O
+error: /tmp/tmpqgZNqF/Backup_over_a_full_disk/datadir/L/0/0/0/39: 28: No
+space left on device
+    ERROR: RCE08AX: I/O error: None: 28: No space left on device
+
+>>> this error is expected
+
+
+ERROR: Test suite FAILED in 1 scenarios
+
+>>> However I would expect the test _not_ to fail :)
+
+
+regards,
+Damien
+
+[1] http://obnam.org/bugs/test-for-full-filesystem/
+
+
+
+
+
+
+--------------090702000209000008050509
+Content-Type: text/x-patch;
+ name="0001-wip.patch"
+Content-Transfer-Encoding: 8bit
+Content-Disposition: attachment;
+ filename="0001-wip.patch"
+
+>From 51d12e91ddcc7aafd788bde9e5ccfd11ffb0f9cb Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Damien=20Courouss=C3=A9?= <damien.courousse@gmail.com>
+Date: Sun, 23 Nov 2014 16:22:01 +0100
+Subject: [PATCH] wip
+
+---
+ yarns/0030-basics.yarn     | 28 ++++++++++++++++++++++++++++
+ yarns/9000-implements.yarn | 28 ++++++++++++++++++++++++++++
+ yarns/obnam.sh             | 13 +++++++++++++
+ 3 files changed, 69 insertions(+)
+
+diff --git a/yarns/0030-basics.yarn b/yarns/0030-basics.yarn
+index 4bc8439..0711e42 100644
+--- a/yarns/0030-basics.yarn
++++ b/yarns/0030-basics.yarn
+@@ -313,3 +313,31 @@ setting to a new size, the backup should still work.
+     AND user U restores their latest generation in repository R into X
+     THEN L, restored to X, matches manifest M
+     AND user U can fsck the repository R
++
++Backup over a full disk
++-----------------------
++
++If the backup destination went full, there should be a safe way to access the
++generations that were previously correctly backuped. Obnam commands over this
++backup repository should (at least) return correct error statements.
++
++    SCENARIO Backup over a full disk
++    ASSUMING user has permissions to create and mount disk images
++    GIVEN 100kB of new data in directory L
++    AND a manifest of L in G1
++    AND a volume V of total size 1MB mounted to R
++    WHEN user U backs up directory L to repository R
++    GIVEN 1MB of new data in directory L
++    THEN user U fails the backup of directory L to repository R
++    WHEN user U restores generation 1 to R1 from repository R
++    THEN L, restored to R1, matches manifest G1
++	FINALLY umount R
++
++Points to solve
+++ how to test failure for the second backup without aborting with an error?
+++ how to create, and later delete, data in repository R?
++
+++ testing failure for the second backup
+++ autre solution: créer de nouvelles data avant le 2e backup, pour remplir le disque,
++  + puis supprimer les data
++  + obnam devrait fonctionner
+diff --git a/yarns/9000-implements.yarn b/yarns/9000-implements.yarn
+index 1a86fbe..7a9788e 100644
+--- a/yarns/9000-implements.yarn
++++ b/yarns/9000-implements.yarn
+@@ -619,6 +619,34 @@ often is disabled on build servers.
+     touch "$DATADIR/xattr.test"
+     setfattr -n user.foo -v bar "$DATADIR/xattr.test"
+ 
++Check on whether user can create and mount volume images
++--------------------------------------------------------
++
++    IMPLEMENTS ASSUMING user has permissions to create and mount disk images
++    echo "TODO" 1>&2
++    exit 0
++
++    IMPLEMENTS GIVEN a volume (\S+) of total size (\S+) mounted to (\S+)
++    echo "volume name: $DATADIR/$MATCH_1" 1>&2
++    echo "size: $MATCH_2" 1>&2
++    create_disk "$DATADIR/$MATCH_1" "$MATCH_2"
++    mkdir -p "$DATADIR/$MATCH_3"
++    sudo mount -o loop,users,defaults "$DATADIR/$MATCH_1" "$DATADIR/$MATCH_3"
++    sudo chmod 777 "$DATADIR/$MATCH_3"
++
++    IMPLEMENTS WHEN fail here
++    exit 1
++
++	IMPLEMENTS FINALLY umount (\S+)
++    sudo -u root umount "$DATADIR/$MATCH_1"
++
++This backup is expected to fail.
++
++    IMPLEMENTS THEN user (\S+) fails the backup of directory (\S+) to repository (\S+)
++    run_obnam "$MATCH_1" backup -r "$DATADIR/$MATCH_3" "$DATADIR/$MATCH_2"
++	exit 0
++
++
+ 
+ Nagios
+ ------
+diff --git a/yarns/obnam.sh b/yarns/obnam.sh
+index 0792bce..4bca356 100644
+--- a/yarns/obnam.sh
++++ b/yarns/obnam.sh
+@@ -192,6 +192,19 @@ get_keyid()
+ }
+ 
+ 
++# Create a disk image
++create_disk()
++{
++    local DISK="$1"
++    local SIZE="$2"
++    local DEV=`sudo losetup -f`
++    dd if=/dev/zero of="$DISK" bs=1 count=0 seek="$SIZE"
++    sudo losetup "$DEV" "$DISK"
++    sudo mkfs.ext3 "$DEV"
++    sudo losetup -d "$DEV"
++}
++
++
+ # Create a dummy $HOME that actually exists.
+ export HOME="$DATADIR/home"
+ mkdir -p "$HOME"
+-- 
+2.1.0
+
+
+
+--------------090702000209000008050509
+Content-Type: text/plain; charset="us-ascii"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Content-Disposition: inline
+
+_______________________________________________
+obnam-dev mailing list
+obnam-dev@obnam.org
+http://listmaster.pepperfish.net/cgi-bin/mailman/listinfo/obnam-dev-obnam.org
+
+--------------090702000209000008050509--
+
diff --git a/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/tmp/.this-dir-not-empty/.empty/empty-file b/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/tmp/.this-dir-not-empty/.empty/empty-file
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tickets/f81fb692b9e041d0839679cba7c83866/Maildir/tmp/.this-dir-not-empty/.empty/empty-file
diff --git a/tickets/f81fb692b9e041d0839679cba7c83866/ticket.yaml b/tickets/f81fb692b9e041d0839679cba7c83866/ticket.yaml
new file mode 100644
index 0000000..ee6da9b
--- /dev/null
+++ b/tickets/f81fb692b9e041d0839679cba7c83866/ticket.yaml
@@ -0,0 +1,4 @@
+ticket-id:
+- f81fb692b9e041d0839679cba7c83866
+title:
+- 'Fwd: how to test failure with yarn ?'