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Diffstat (limited to 'examples/lvmpbuilder/STRATEGY')
| -rw-r--r-- | examples/lvmpbuilder/STRATEGY | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/examples/lvmpbuilder/STRATEGY b/examples/lvmpbuilder/STRATEGY new file mode 100644 index 0000000..3c9c9e9 --- /dev/null +++ b/examples/lvmpbuilder/STRATEGY @@ -0,0 +1,29 @@ +1. We require that the user has defined (either + in the environment or in one of the pbuilderrc + files), two devices: + BASEDEV + This is the device where the persistent + ext2 filesystem containing the basic build + file system lies (what is usually kept + in base.tgz). This file system should be + e2fsck -f clean. create/update/clean go here. + COWDEV + This is the device to which the writes + will actually go during the build/login/execute. + +2. For create/update/clean, we just mount BASEDEV in the appropriate + place and run pbuilder create/update/clean --no-tgz. We run an + e2fsck -f at the end. + +3. For all other operations: + a. we create a new device TOTALDEV consisting of BASEDEV + extended by zeroes by the size of COWDEV. + d. we create a snapshot version WORKDEV of TOTALDEV with + the writes going to COWDEV. + e. we resize2fs the filesystem WORKDEV. This + step could be *slow*. + f. we mount WORKDEV in the appropriate place and run + pbuilder with the appropriate command. + g. on exit or error we must unmount WORKDEV and + remove WORKDEV and TOTALDEV. + |