While at it, also remove unnecessary "#!/usr/bin/env python3" in files
that only get imported, and adjust other empty/comment lines in the
beginnings of the files for consistency.
This makes files easier to read, and makes the pmbootstrap codebase more
consistent with the build.postmarketos.org codebase.
* New "pmbootstrap build --src=/local/source/path hello-world" syntax
* The local source path gets mounted inside the chroot
* From there, a copy of the source code gets created with rsync (so
we can write into the source folder if necessary, for better
compatibility with all kinds of APKBUILDs)
* After the aport gets copied into the chroot before building (as
usually), we extend the APKBUILD with overrides to make it use
mountpoint's source instead of downloading the package's source
from the web as usually
* The package built with the local source gets _pYYYYMMDDHHMMSS
appended to the pkgver
* linux-postmarketos-mainline: use $builddir, fix patch checksum
On my system, /proc/mounts sometimes contains a line like
```
udev /media/zhuowei/redhd/pmbootstrap/chroot_native/dev/loop0p2\040(deleted)
devtmpfs rw,relatime,size=1959476k,nr_inodes=489869,mode=755 0 0
```
The "\040(deleted)" text confuses `pmbootstrap shutdown`. Remove the suffix
if we find it in a /proc/mounts entry. This fixes#545.
I've replaced all instances in the code of `os.path.abspath`
with `os.path.realpath`, as this does the same as `abspath`
plus resolving symlinks.
See also: https://stackoverflow.com/a/40311142
* Refactored `umount_all` to get the list of folders to be umounted from
`umount_all_list`, so we can test that function in a test case.
* Adjusted `umount_all_list` to return the deep folder levels first
* Added a testcase for that
* Remove redundant calls to `umount_all()` (which were from a time before
`pmbootstrap` was released, in which failing commands did not cause
`pmbootstrap` to raise an exception)
* The check for valid sdcard paths has been removed (because it
doesn't make sense for /dev/sd*, this might as well be a real
harddrive)
* New check: abort if any partition of the sdcard is mounted
* Automatically detect if the partitions are called "p1", "p2" etc.
or just "1", "2" etc. (/dev/sda1 vs. /dev/mmcblk0p1)
* pmb.helpers.mount.ismount(): check the source (new) and the target
path in /proc/mounts
