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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-10-06 12:55:17 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-10-06 13:26:17 +0200
commit19b7609586aac382f21bdc5c7369c56417775d6d (patch)
treefb466c28735f16b22c8f15662af16551a480df25 /doc/tar2sqfs.1
parentbe78958a2f132a5907b0f5beafe7c33a67125eb8 (diff)
Update tar2sqfs and sqfs2tar man page
- Add recent changes - Fix spelling and similar mistakes - Remove outdated/contradictory stuff - Consistent spelling of SquashFS - Simplify some formulations Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'doc/tar2sqfs.1')
-rw-r--r--doc/tar2sqfs.142
1 files changed, 23 insertions, 19 deletions
diff --git a/doc/tar2sqfs.1 b/doc/tar2sqfs.1
index 346d7e7..c2c7f72 100644
--- a/doc/tar2sqfs.1
+++ b/doc/tar2sqfs.1
@@ -1,16 +1,16 @@
.TH TAR2SQFS "1" "June 2019" "tar2sqfs" "User Commands"
.SH NAME
-tar2sqfs \- create a squashfs image from a tar archive
+tar2sqfs \- create a SquashFS image from a tar archive
.SH SYNOPSIS
.B tar2sqfs
[\fI\,OPTIONS\/\fR...] \fI\,<sqfsfile>\/\fR
.SH DESCRIPTION
-Read an uncompressed tar archive from stdin and turn it into a squashfs
+Read an uncompressed tar archive from stdin and turn it into a SquashFS
filesystem image.
-The idea is to quickly and painlessly turn a tar ball into a squashfs
+The idea is to quickly and painlessly turn a tar ball into a SquashFS
filesystem image, so existing tools that work with tar can be used for
-squashfs.
+SquashFS.
.PP
Possible options:
.TP
@@ -34,18 +34,13 @@ starts waiting for the block processors to catch up. Higher values result
in higher memory consumption. Defaults to 10 times the number of workers.
.TP
\fB\-\-block\-size\fR, \fB\-b\fR <size>
-Block size to use for Squashfs image.
+Block size to use for SquashFS image.
Defaults to 131072.
.TP
\fB\-\-dev\-block\-size\fR, \fB\-B\fR <size>
Device block size to padd the image to.
Defaults to 4096.
.TP
-\fB\-\-keep\-time\fR, \fB\-k\fR
-Keep the same time stamps stored in the tar archive for the SquashFS instead of
-setting defaults on all files. The root inode and the modification time on the
-SquashFS image itself will still be set to defaults.
-.TP
\fB\-\-defaults\fR, \fB\-d\fR <options>
A comma seperated list of default values for
implicitly created directories.
@@ -66,6 +61,16 @@ mtime=<value>;\fB$SOURCE\_DATE\_EPOCH\fR if set, 0 otherwise
.TE
.TP
.TP
+\fB\-\-no\-keep\-time\fR, \fB\-k\fR
+Replace the time stamps from the tar archive with default time stamps for all
+entries.
+
+The default behavior if not specified, is to preserve the time stamps from the
+archive to the extent possible (SquashFS has second resolution and 32 bit time
+stamps; tar can use extensions to specify much larger timestamps with arbitrary
+precision). The root inode and the modification time on the SquashFS image
+itself will always still be set to defaults.
+.TP
\fB\-\-no\-xattr\fR, \fB\-x\fR
Do not copy extended attributes from archive. Default behaviour is to copy all
extended attributes and skip the ones that cannot be encoded in SquashFS.
@@ -88,15 +93,14 @@ Print help text and exit.
\fB\-\-version\fR, \fB\-V\fR
Print version information and exit.
.SH COMPATIBILITY
-The tool is designed to support a broad variety of commonly used tar archives.
-Currently the tool can process v7 format, pre-POSIX ustar, POSIX tar and GNU
-tar archives. PAX extension headers are supported.
+Currently the program can process v7 format, pre-POSIX ustar, POSIX tar and GNU
+tar archives. PAX extension headers are also supported.
-The support for GNU tar is limited to commonly used header formats (i.e. some
-older, legacy headers are not supported) and extensions like sparse files.
+The support for GNU tar is limited to commonly used subset (i.e. some legacy
+extensions that GNU tar itself no longer generates are not supported; neither
+are mutli volume archives).
Hard links are currently not supported and silently converted to symlinks.
-Furthermore, none of the various xattr extensions are currently implemented.
Extended attributes are supported through the SCHILY.xattr PAX extension
(favoured by GNU tar and star) or through the LIBARCHIVE.xattr PAX extension.
@@ -118,15 +122,15 @@ are set. Explicit command line switches are always preferred over the
environment variables.
.SH EXAMPLES
.TP
-Turn an uncompressed tar archive into a squashfs image:
+Turn an uncompressed tar archive into a SquashFS image:
.IP
tar2sqfs rootfs.sqfs < rootfs.tar
.TP
-Turn a gzip'ed tar archive into a squashfs image:
+Turn a gzip'ed tar archive into a SquashFS image:
.IP
zcat rootfs.tar.gz | tar2sqfs rootfs.sqfs
.TP
-Turn an LZMA2 compressed tar archive into a squashfs image:
+Turn an LZMA2 compressed tar archive into a SquashFS image:
.IP
xzcat rootfs.tar.xz | tar2sqfs rootfs.sqfs
.SH SEE ALSO